Pinging Spark Knock Pre-Ignition
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Posts: n/a
Originally Posted by Lip
I experience this issue. For me, you can hear the pinging most below 3800 rpm.
However, on the dyno, the car pinged through the higher ranges, albeit less noticeable due to exhaust and intake noise.
More so on certain types of gas, less on others.
Example, in RWC, they Unocal 76 on Woodside Rd. sells 100 octane unleaded fuel ($5.15/gallon last I checked) If I mix half a tank of 100 with 91, little if any knocking and the car seems to come on cam at 4500 more consistently, probably because the timing isn't retarded with the higher octane fuel.
The cause? I've heard a few theories.
1. The most obvious: 91 Octane combined with Fuel additives, especially in California. My VW/Audi products experienced the same issues on California gas. Somebody suggested to me that running the cheapest fuel may actually be the best answer as it doesn't include things like Techron and the like.
My results were mixed to be honest. I can run Chevron on one occasion without much pinging and then she'll ping like mad the next time I fill up.
2. Not so obvious: Detonation detection sensor/Knock sensor-
A well informed source told me that the location of the sensor is in a not so ideal location on this motor. Additionally, it has a hard time detecting detonation due to the design and the mounting.
The same source told me that a fix would be to at least mount the sensor with a water jacket that would allow sound to resonate with greater effect, thus allowing the engine to adjust it's timing/air/fuel ratios more readily.
My experiences: Adding more air, accentuates the pinging (i.e. Plenum spacer, CAI, etc) The Unichip helped to eliminate some pinging. Hot weather results in more pinging.
The intake in these cars doesn't seem to dissipate heat very well.
Thus, I've experimented with removing the decrative plastic plenum cover.
Luckily, we just had a few days with 90+ degree temps. I think it helps a little , as I'm not pinging as much as before. (hard to quantify, I know)
The car still runs like a champ, I'm just careful not to the lug the car too hard below 3000 rpm.
Would better cooling help?
Different Thermostat?
However, on the dyno, the car pinged through the higher ranges, albeit less noticeable due to exhaust and intake noise.
More so on certain types of gas, less on others.
Example, in RWC, they Unocal 76 on Woodside Rd. sells 100 octane unleaded fuel ($5.15/gallon last I checked) If I mix half a tank of 100 with 91, little if any knocking and the car seems to come on cam at 4500 more consistently, probably because the timing isn't retarded with the higher octane fuel.
The cause? I've heard a few theories.
1. The most obvious: 91 Octane combined with Fuel additives, especially in California. My VW/Audi products experienced the same issues on California gas. Somebody suggested to me that running the cheapest fuel may actually be the best answer as it doesn't include things like Techron and the like.
My results were mixed to be honest. I can run Chevron on one occasion without much pinging and then she'll ping like mad the next time I fill up.
2. Not so obvious: Detonation detection sensor/Knock sensor-
A well informed source told me that the location of the sensor is in a not so ideal location on this motor. Additionally, it has a hard time detecting detonation due to the design and the mounting.
The same source told me that a fix would be to at least mount the sensor with a water jacket that would allow sound to resonate with greater effect, thus allowing the engine to adjust it's timing/air/fuel ratios more readily.
My experiences: Adding more air, accentuates the pinging (i.e. Plenum spacer, CAI, etc) The Unichip helped to eliminate some pinging. Hot weather results in more pinging.
The intake in these cars doesn't seem to dissipate heat very well.
Thus, I've experimented with removing the decrative plastic plenum cover.
Luckily, we just had a few days with 90+ degree temps. I think it helps a little , as I'm not pinging as much as before. (hard to quantify, I know)
The car still runs like a champ, I'm just careful not to the lug the car too hard below 3000 rpm.
Would better cooling help?
Different Thermostat?
Every A/F ratio of almost every stock VQ (rev up or not) I have seen, has been on the rich side. Like almost every other car out there, it runs rich from the factory.
Have any of you read your spark plugs? What did they look like? The only time this car would ping, is if you had 87 octane in there and were revving it to 6k or greater. Even then, timing would retard. You wouldn't do any damage unless you continually did this.
Knock sensor in an ineffective area? I don't think so. Want to test? Find some bozo with an FI VQ . Connect to the OBDII port with a data logger and take the car for a full throttle run. Count the number of knock hits that is recorded. I gurantee you will see 4 or greater. It is normal and the knock sensor does it's job. Want to see it not do it's job, want to really hear pinging? Bypass the Knock sensor before the ECU with a resistor. Then do a full throttle run
Intake doesnt dissipate heat very well? Are you kidding me?
Joined: Feb 2006
Posts: 13,068
Likes: 101
From: Southern Cali --> 818
I assume I have no pinging issue, because if I did, it would be rather obvious, right?
I know what pinging/knocking is. But have not heard anything strange from my engine.
The only only strange thing I have ever heard was a strange loud vibration during WOT at the track, particularly around 6000 rpm's in third, when my acceleration is held the longest.
Anyone think this "vibration" I have encountered before at the track is an issue? Or just normal?
.
I know what pinging/knocking is. But have not heard anything strange from my engine.
The only only strange thing I have ever heard was a strange loud vibration during WOT at the track, particularly around 6000 rpm's in third, when my acceleration is held the longest.
Anyone think this "vibration" I have encountered before at the track is an issue? Or just normal?
.
Joined: Jun 2002
Posts: 30,341
Likes: 9
From: Cambridge, Ont. Canada
Originally Posted by skaterbasist
I assume I have no pinging issue, because if I did, it would be rather obvious, right?
I know what pinging/knocking is. But have not heard anything strange from my engine.
The only only strange thing I have ever heard was a strange loud vibration during WOT at the track, particularly around 6000 rpm's in third, when my acceleration is held the longest.
Anyone think this "vibration" I have encountered before at the track is an issue? Or just normal?
.
I know what pinging/knocking is. But have not heard anything strange from my engine.
The only only strange thing I have ever heard was a strange loud vibration during WOT at the track, particularly around 6000 rpm's in third, when my acceleration is held the longest.
Anyone think this "vibration" I have encountered before at the track is an issue? Or just normal?
.
Agreed. It would be very obvious.
I've read that the knock sensor can effect as much as 10 or 12 degrees retardation if necessary which should nullify any preignition.
I personally think Damon is right on here too.
C.
Registered User
iTrader: (10)
Joined: Jul 2006
Posts: 3,942
Likes: 7
From: PNW in Washington
6MT Coupe
1. ByThaBay
2. Fini
3. zipzow
4. jeffy1
5. ttrank (only at very high rpm on hot days with Stillen stage 4)
6. trey.hutcheson (from the factory) - 32k miles, stillen airbox, ztube, mrev+, test pipes, exhaust - part throttle, heavy throttle, low rpms, WOT, cool, hot
7. Foo_G ( on acceleration and in high RPM it is really bad )
8. SHaigh (stock, discovered @6K miles, when engine is very warm, details in other thread)
9. 6MTzer (low rpm's, comes and goes, usually when the outside temp is hot.)Motordyne Plenum Spacer.
10. droppin_deuces (thanks for starting this BythaBay)
11. jdmeg21 - on very warm or hot days, at low rpm while giving heavy throttle - notice it between 1,2,3 - have hks exhaust, stillen intake. If I don't gas it like crazy I don't get the pinging.
12. donkeykong - at around 2k RPM up until around 2.5k RPM with hard acceleration
13. alderran - very slight last summer but now that the weather is getting warmer here I'm noticing it again and it's much worse. Bringing the car in on Wed.
14. 06CPV35 - on hot days and heavy load in low rpms. JWT intake; Injen Dual Ti Exhaust; Engine cover off. Dyno a/f shows lean untill 3200 rpm.
15.
2. Fini
3. zipzow
4. jeffy1
5. ttrank (only at very high rpm on hot days with Stillen stage 4)
6. trey.hutcheson (from the factory) - 32k miles, stillen airbox, ztube, mrev+, test pipes, exhaust - part throttle, heavy throttle, low rpms, WOT, cool, hot
7. Foo_G ( on acceleration and in high RPM it is really bad )
8. SHaigh (stock, discovered @6K miles, when engine is very warm, details in other thread)
9. 6MTzer (low rpm's, comes and goes, usually when the outside temp is hot.)Motordyne Plenum Spacer.
10. droppin_deuces (thanks for starting this BythaBay)
11. jdmeg21 - on very warm or hot days, at low rpm while giving heavy throttle - notice it between 1,2,3 - have hks exhaust, stillen intake. If I don't gas it like crazy I don't get the pinging.
12. donkeykong - at around 2k RPM up until around 2.5k RPM with hard acceleration
13. alderran - very slight last summer but now that the weather is getting warmer here I'm noticing it again and it's much worse. Bringing the car in on Wed.
14. 06CPV35 - on hot days and heavy load in low rpms. JWT intake; Injen Dual Ti Exhaust; Engine cover off. Dyno a/f shows lean untill 3200 rpm.
15.
Add me to the list
6000 miles 2006 g35 coupe 6mt, no mods has been doing it since I brought her home on day one
normally I hear it when I start my car and put it in reverse and back out of garage.....while I'm in the garage or just pulled out regardless of gear
wtf is up with it?
6000 miles 2006 g35 coupe 6mt, no mods has been doing it since I brought her home on day one
normally I hear it when I start my car and put it in reverse and back out of garage.....while I'm in the garage or just pulled out regardless of gear
wtf is up with it?
Registered User
iTrader: (10)
Joined: Jul 2006
Posts: 3,942
Likes: 7
From: PNW in Washington
6MT Coupe
^^^Added you. It's easy to do. Copy previous list and paste into your new reply, then add yourself. (just so you know for next time)
1. ByThaBay
2. Fini
3. zipzow
4. jeffy1
5. ttrank (only at very high rpm on hot days with Stillen stage 4)
6. trey.hutcheson (from the factory) - 32k miles, stillen airbox, ztube, mrev+, test pipes, exhaust - part throttle, heavy throttle, low rpms, WOT, cool, hot
7. Foo_G ( on acceleration and in high RPM it is really bad )
8. SHaigh (stock, discovered @6K miles, when engine is very warm, details in other thread)
9. 6MTzer (low rpm's, comes and goes, usually when the outside temp is hot.)Motordyne Plenum Spacer.
10. droppin_deuces (thanks for starting this BythaBay)
11. jdmeg21 - on very warm or hot days, at low rpm while giving heavy throttle - notice it between 1,2,3 - have hks exhaust, stillen intake. If I don't gas it like crazy I don't get the pinging.
12. donkeykong - at around 2k RPM up until around 2.5k RPM with hard acceleration
13. alderran - very slight last summer but now that the weather is getting warmer here I'm noticing it again and it's much worse. Bringing the car in on Wed.
14. 06CPV35 - on hot days and heavy load in low rpms. JWT intake; Injen Dual Ti Exhaust; Engine cover off. Dyno a/f shows lean untill 3200 rpm.
15. AAClaire420 - 6000 miles 2006 g35 coupe 6mt, no mods has been doing it since I brought her home on day one
16.
1. ByThaBay
2. Fini
3. zipzow
4. jeffy1
5. ttrank (only at very high rpm on hot days with Stillen stage 4)
6. trey.hutcheson (from the factory) - 32k miles, stillen airbox, ztube, mrev+, test pipes, exhaust - part throttle, heavy throttle, low rpms, WOT, cool, hot
7. Foo_G ( on acceleration and in high RPM it is really bad )
8. SHaigh (stock, discovered @6K miles, when engine is very warm, details in other thread)
9. 6MTzer (low rpm's, comes and goes, usually when the outside temp is hot.)Motordyne Plenum Spacer.
10. droppin_deuces (thanks for starting this BythaBay)
11. jdmeg21 - on very warm or hot days, at low rpm while giving heavy throttle - notice it between 1,2,3 - have hks exhaust, stillen intake. If I don't gas it like crazy I don't get the pinging.
12. donkeykong - at around 2k RPM up until around 2.5k RPM with hard acceleration
13. alderran - very slight last summer but now that the weather is getting warmer here I'm noticing it again and it's much worse. Bringing the car in on Wed.
14. 06CPV35 - on hot days and heavy load in low rpms. JWT intake; Injen Dual Ti Exhaust; Engine cover off. Dyno a/f shows lean untill 3200 rpm.
15. AAClaire420 - 6000 miles 2006 g35 coupe 6mt, no mods has been doing it since I brought her home on day one
16.
Last edited by V35 Skyline GT; May 11, 2007 at 10:36 AM.
1. ByThaBay
2. Fini
3. zipzow
4. jeffy1
5. ttrank (only at very high rpm on hot days with Stillen stage 4)
6. trey.hutcheson (from the factory) - 32k miles, stillen airbox, ztube, mrev+, test pipes, exhaust - part throttle, heavy throttle, low rpms, WOT, cool, hot
7. Foo_G ( on acceleration and in high RPM it is really bad )
8. SHaigh (stock, discovered @6K miles, when engine is very warm, details in other thread)
9. 6MTzer (low rpm's, comes and goes, usually when the outside temp is hot.)Motordyne Plenum Spacer.
10. droppin_deuces (thanks for starting this BythaBay)
11. jdmeg21 - on very warm or hot days, at low rpm while giving heavy throttle - notice it between 1,2,3 - have hks exhaust, stillen intake. If I don't gas it like crazy I don't get the pinging.
12. donkeykong - at around 2k RPM up until around 2.5k RPM with hard acceleration
13. alderran - very slight last summer but now that the weather is getting warmer here I'm noticing it again and it's much worse. Bringing the car in on Wed.
14. 06CPV35 - on hot days and heavy load in low rpms. JWT intake; Injen Dual Ti Exhaust; Engine cover off. Dyno a/f shows lean untill 3200 rpm.
15. AAClaire420 - 6000 miles 2006 g35 coupe 6mt, no mods has been doing it since I brought her home on day one
16. mitchelm - 3500 miles on 2006 g35 6mt sedan. No mods, has been pinging since brand new in 1st and 2nd gear 1800-2300rpm.
2. Fini
3. zipzow
4. jeffy1
5. ttrank (only at very high rpm on hot days with Stillen stage 4)
6. trey.hutcheson (from the factory) - 32k miles, stillen airbox, ztube, mrev+, test pipes, exhaust - part throttle, heavy throttle, low rpms, WOT, cool, hot
7. Foo_G ( on acceleration and in high RPM it is really bad )
8. SHaigh (stock, discovered @6K miles, when engine is very warm, details in other thread)
9. 6MTzer (low rpm's, comes and goes, usually when the outside temp is hot.)Motordyne Plenum Spacer.
10. droppin_deuces (thanks for starting this BythaBay)
11. jdmeg21 - on very warm or hot days, at low rpm while giving heavy throttle - notice it between 1,2,3 - have hks exhaust, stillen intake. If I don't gas it like crazy I don't get the pinging.
12. donkeykong - at around 2k RPM up until around 2.5k RPM with hard acceleration
13. alderran - very slight last summer but now that the weather is getting warmer here I'm noticing it again and it's much worse. Bringing the car in on Wed.
14. 06CPV35 - on hot days and heavy load in low rpms. JWT intake; Injen Dual Ti Exhaust; Engine cover off. Dyno a/f shows lean untill 3200 rpm.
15. AAClaire420 - 6000 miles 2006 g35 coupe 6mt, no mods has been doing it since I brought her home on day one
16. mitchelm - 3500 miles on 2006 g35 6mt sedan. No mods, has been pinging since brand new in 1st and 2nd gear 1800-2300rpm.
Originally Posted by Damon
I think everyone is chasing a ghost with their theories. Those who are NA, are more than likely not hearing pinging at all. Those with FI, may be hearing detonation, which is resolved by going two steps colder on plugs and balancing the A/F ratio with more FUEL.
Every A/F ratio of almost every stock VQ (rev up or not) I have seen, has been on the rich side. Like almost every other car out there, it runs rich from the factory.
Have any of you read your spark plugs? What did they look like? The only time this car would ping, is if you had 87 octane in there and were revving it to 6k or greater. Even then, timing would retard. You wouldn't do any damage unless you continually did this.
Knock sensor in an ineffective area? I don't think so. Want to test? Find some bozo with an FI VQ . Connect to the OBDII port with a data logger and take the car for a full throttle run. Count the number of knock hits that is recorded. I gurantee you will see 4 or greater. It is normal and the knock sensor does it's job. Want to see it not do it's job, want to really hear pinging? Bypass the Knock sensor before the ECU with a resistor. Then do a full throttle run
Intake doesnt dissipate heat very well? Are you kidding me?
Every A/F ratio of almost every stock VQ (rev up or not) I have seen, has been on the rich side. Like almost every other car out there, it runs rich from the factory.
Have any of you read your spark plugs? What did they look like? The only time this car would ping, is if you had 87 octane in there and were revving it to 6k or greater. Even then, timing would retard. You wouldn't do any damage unless you continually did this.
Knock sensor in an ineffective area? I don't think so. Want to test? Find some bozo with an FI VQ . Connect to the OBDII port with a data logger and take the car for a full throttle run. Count the number of knock hits that is recorded. I gurantee you will see 4 or greater. It is normal and the knock sensor does it's job. Want to see it not do it's job, want to really hear pinging? Bypass the Knock sensor before the ECU with a resistor. Then do a full throttle run
Intake doesnt dissipate heat very well? Are you kidding me?
I'm not even sure if it's detonation, or pre-ignition.
I'm hoping if you are more knowledgeable, you'll offer some more detail. In particular, I hope you can articulate what you believe I am hearing, so I don't chase my tail.
An "issue" does exist, if not pinging, I'm not sure what you would call it.
The engine does make a sound, and it sounds like what I've come to know as pinging. The car has 8000 miles showing on the odo and I have yet to check the spark plugs. I'll check the plugs and perhaps a replacement would help as well. My car made the above mentioned "pinging" sound from day 1.
I check the oil religiously.
Who knows, California's fuel mixture available at most pumps might also be part of the issue. Not the octane, but would the amount of ethanol cause what I'm hearing?
If I run 5 gallons of 100(unleaded-race) mixed with 15 gallons or so of 91, the "pinging" is reduced dramatically. Though, still exists at initial step-in(pre-ignition as opposed to detonation?)
When the car is cooler(albeit after the temp gauge reaches normal level), or it's cooler outside, there is less of an issue(i.e. the car doesn't "ping" as much-does this point to heat soak related detonation?).
It's most noticeable at step-in(obviously as the knock sensor doesn't yet have the opportunity to perform it's function) and consistent under part to 3/4 throttle between 2800revs through 4000revs.
I could fry an egg on my intake manifold an hour after the car was shut down.
Originally Posted by Msedanman
Agreed. It would be very obvious.
I've read that the knock sensor can effect as much as 10 or 12 degrees retardation if necessary which should nullify any preignition.
I personally think Damon is right on here too.
C.
I've read that the knock sensor can effect as much as 10 or 12 degrees retardation if necessary which should nullify any preignition.
I personally think Damon is right on here too.
C.
Could it be detonation, pre-ignition, California Fuel Mixture or something entirely different?
Last edited by Lip; Jun 20, 2007 at 11:43 PM.
Registered User
iTrader: (10)
Joined: Jul 2006
Posts: 3,942
Likes: 7
From: PNW in Washington
6MT Coupe
Purely my opinion and I have theories, just haven't had time to implement my ideas.
91 oct I feel plays a big part over all, but it's Cali's stuff so what can you do other than mix with higher oct race fuel (pain in the ***).
Other states I believe offer higher oct like 93-95 which would help a lot. 91 is border-line acceptable for these rev-up VQ's imo and how they're factory tuned.
Cali emission standards doesn't help either. My rev-up VQ runs lean in the lower rpms according to my base a/f dyno pulls. Lean = hotter running and more susceptible to detonation.
Heat soak is my theory to the main problem. My plenum, TB and polished Z-tube is hotter than heck which super heats the intake air.
On cold days (cold and denser intake air) I have no pinging at all. Plus no pinging even on hot days until everything becomes heat soaked, then it pings.
So with 91, tuned lean in lower rpm range and super heated intake air, there's the recipe for detonation.
I'm thinking of trying iso thermal gaskets on my plenum to reduce the heat soak or have my chip reflashed/replaced or try a CAI or all the above. Last thing I want is the knock sensor to kick in, retard my timing and reduce hp, though I'm glad it's there to do it's job. Serious and/or prolonged detonation will beat any engine to death over time.
Detonation, knocking, pre-ignition, pinging in my book mean the same thing. The mixture is exploding rather than burning in the combustion chamber.
91 oct I feel plays a big part over all, but it's Cali's stuff so what can you do other than mix with higher oct race fuel (pain in the ***).
Other states I believe offer higher oct like 93-95 which would help a lot. 91 is border-line acceptable for these rev-up VQ's imo and how they're factory tuned.
Cali emission standards doesn't help either. My rev-up VQ runs lean in the lower rpms according to my base a/f dyno pulls. Lean = hotter running and more susceptible to detonation.
Heat soak is my theory to the main problem. My plenum, TB and polished Z-tube is hotter than heck which super heats the intake air.
On cold days (cold and denser intake air) I have no pinging at all. Plus no pinging even on hot days until everything becomes heat soaked, then it pings.
So with 91, tuned lean in lower rpm range and super heated intake air, there's the recipe for detonation.
I'm thinking of trying iso thermal gaskets on my plenum to reduce the heat soak or have my chip reflashed/replaced or try a CAI or all the above. Last thing I want is the knock sensor to kick in, retard my timing and reduce hp, though I'm glad it's there to do it's job. Serious and/or prolonged detonation will beat any engine to death over time.
Detonation, knocking, pre-ignition, pinging in my book mean the same thing. The mixture is exploding rather than burning in the combustion chamber.
Thanks for the reply. No question, I'd rather not have the knock sensor kill the fun.
I'd really be interested in knowing what your tests yield with regards to the ISO thermal spacers.
The coolant shutoff valve that came with my motordyne kit is not currently installed. That's probably a good place to start.
I wonder how well the after market upper intakes disipate heat?
Lip
I'd really be interested in knowing what your tests yield with regards to the ISO thermal spacers.
The coolant shutoff valve that came with my motordyne kit is not currently installed. That's probably a good place to start.
I wonder how well the after market upper intakes disipate heat?
Lip
Registered User
Joined: Dec 2005
Posts: 292
Likes: 0
1. ByThaBay
2. Fini
3. zipzow
4. jeffy1
5. ttrank (only at very high rpm on hot days with Stillen stage 4)
6. trey.hutcheson (from the factory) - 32k miles, stillen airbox, ztube, mrev+, test pipes, exhaust - part throttle, heavy throttle, low rpms, WOT, cool, hot
7. Foo_G ( on acceleration and in high RPM it is really bad )
8. SHaigh (stock, discovered @6K miles, when engine is very warm, details in other thread)
9. 6MTzer (low rpm's, comes and goes, usually when the outside temp is hot.)Motordyne Plenum Spacer.
10. droppin_deuces (thanks for starting this BythaBay)
11. jdmeg21 - on very warm or hot days, at low rpm while giving heavy throttle - notice it between 1,2,3 - have hks exhaust, stillen intake. If I don't gas it like crazy I don't get the pinging.
12. donkeykong - at around 2k RPM up until around 2.5k RPM with hard acceleration
13. alderran - very slight last summer but now that the weather is getting warmer here I'm noticing it again and it's much worse. Bringing the car in on Wed.
14. 06CPV35 - on hot days and heavy load in low rpms. JWT intake; Injen Dual Ti Exhaust; Engine cover off. Dyno a/f shows lean untill 3200 rpm.
15. AAClaire420 - 6000 miles 2006 g35 coupe 6mt, no mods has been doing it since I brought her home on day one
16. mitchelm - 3500 miles on 2006 g35 6mt sedan. No mods, has been pinging since brand new in 1st and 2nd gear 1800-2300rpm.
17. NickS - 32k miles - 2005 G35 Sedan, Sport, 6spd
2. Fini
3. zipzow
4. jeffy1
5. ttrank (only at very high rpm on hot days with Stillen stage 4)
6. trey.hutcheson (from the factory) - 32k miles, stillen airbox, ztube, mrev+, test pipes, exhaust - part throttle, heavy throttle, low rpms, WOT, cool, hot
7. Foo_G ( on acceleration and in high RPM it is really bad )
8. SHaigh (stock, discovered @6K miles, when engine is very warm, details in other thread)
9. 6MTzer (low rpm's, comes and goes, usually when the outside temp is hot.)Motordyne Plenum Spacer.
10. droppin_deuces (thanks for starting this BythaBay)
11. jdmeg21 - on very warm or hot days, at low rpm while giving heavy throttle - notice it between 1,2,3 - have hks exhaust, stillen intake. If I don't gas it like crazy I don't get the pinging.
12. donkeykong - at around 2k RPM up until around 2.5k RPM with hard acceleration
13. alderran - very slight last summer but now that the weather is getting warmer here I'm noticing it again and it's much worse. Bringing the car in on Wed.
14. 06CPV35 - on hot days and heavy load in low rpms. JWT intake; Injen Dual Ti Exhaust; Engine cover off. Dyno a/f shows lean untill 3200 rpm.
15. AAClaire420 - 6000 miles 2006 g35 coupe 6mt, no mods has been doing it since I brought her home on day one
16. mitchelm - 3500 miles on 2006 g35 6mt sedan. No mods, has been pinging since brand new in 1st and 2nd gear 1800-2300rpm.
17. NickS - 32k miles - 2005 G35 Sedan, Sport, 6spd
Registered User
iTrader: (10)
Joined: Jul 2006
Posts: 3,942
Likes: 7
From: PNW in Washington
6MT Coupe
Wow...forgot about this thread lol.
Also learned since my last post long time ago, that oil consumption can kill oct rating which will also cause detonation.
No isothermal gaskets on mine yet to test my previous theory. I suffer OC with my revup and still waiting for test completion to qualify me for replacement, so no reason to install those plenum/TB gaskets yet.
Also learned since my last post long time ago, that oil consumption can kill oct rating which will also cause detonation.
No isothermal gaskets on mine yet to test my previous theory. I suffer OC with my revup and still waiting for test completion to qualify me for replacement, so no reason to install those plenum/TB gaskets yet.
