(Tongue in cheek here re Sothern US Ladies and Gents)

New to the forum and cognizant of not wasting time but I could not resist. Look to the far right on the pic. FYI - that translates into -17F. Had to put on a long sleeve shirt today damn it!!!!
Anyway, new to the forum and G35's, but an old car guy.
Just spent 7 years on a frame off, 1965 GTO (Pontiac, not Ferrari). Summer car only. That said, I absoultley love my G35 (04) sedan. Although the GTO (stroked and bored 461 Butler recipe) dynoed at 508 hp and 572 torque (flywheel), it cannot plant and straightline accelerate like the G35. I "cannot" believe how much fun the G35 is .Don't get me totally wrong, I love my GTO but you have to drive it and with a stock rebuilt 4 speed and suspension, needs all of your attention.
Being an older guy born and raised on North American cars, took me a long time to try an import. Wish I would have done it earlier. My oh my what a great product the G35 is. The only crappy thing is how I am going to split the expendable income between the 2. Sold for life on the Infiniti's!!!!!(Love my GOAT still and will not put out to pasture just yet).
Quick question, after reading the forum for many,many hours, pro's/cons power adders, etc, just looking at a plenum spacer. I can relate to A/F ratio's. An engine is just an air pump and all has to work in sync. Back in the day, adding a carb spacer increased your "A" of AF but without adding the "F" most of the time added up to a screwed up AF balance. Does adding more air on a G35 not require a cooresponding "F" consideration? I am all about testing the boundaries but "CALCULATED".
Thanks in advance everyone!

 

Yeah, I'll take my 70 degree (that's farenheit) weather here in sunny FL. Thought maybe I'd have to wear shoes instead of flip flops today, was just a thought though.

 

lol +1

 

Our cars is all run by a computer. Adding a basic spacer + resetting ecu will definitely bring you some more ponies. Add a proper exhaust with hfc's And it is much better.

after an ecu reset it will automatically adjust af ratio but a proper tune will be better

 

Search about an osiris tune...

 

OP you're on the right track. With all this talk about CAIs, plenum spacers, HFCs, and exhausts, noobs forget that if you continually add more "A" as you put it and don't increase the amount of "F" you'll start to run leaner and leaner which can be dangerous to the motor. Re-setting the ECU as suggested will help a touch, but if you've done a lot of breather mods it won't fix the issue.

NATH is spot on with his advice. If you add more than an intake you'll need a custom ECU re-tune to correct your A/F ratio. Go to UpRev.com and read up on the Osiris tune. It's a little pricey, but damn it is a bad azz mod for our cars. Welcome to the family, I had a 72 Cutlass 442 back in the late 70s in high school and I miss that car everyday. Nothing like a little old school muscle to get the blood pumping.

 

I too was interested to find out just what the ECU is capable of, after hearing all the hype that it is totally self learning etc, but in reality its smarter than some, but not that smart,
it does have the ability to monitor itself in that it runs a kind live comparator map, and should things like AF or timing exceed preset extremes it will throw an error as things are out of range, yet be able to self adjust withing reason, however i still haven't found the extremes by adding things like decats or plenum spacer.

I will elaborate, i was originally going to self tune using Osiris, (i have experience of mapping ECUs etc before) so the first thing i did was to fit an Innovate twin wideband setup, i monitored general engine parameters along with AFRs,
i then added decat pipes and noticed no big change, which obviously points to the ECU being able to compensate for the extra flow, however i didn't keep the decats due to them being too loud with my exhaust.

Recently i have added a 1/8 plenum spacer, and have monitored AFRs and found no big changes there, which also points to the ECU being able to cope with the increased airflow, i haven't yet been able to do any high RPM/load logs of this so i don't yet know if the ECU can compensate once in open loop, but it has no problems keeping AFRs correct withing closed loop, which covers a prety large RPM/load area with an N/A motor, i will comment further once i get around to logging some more.

I suspect that adding decats and plenum spacer along with a decent free flow exhaust may push the ECU to its limits and then require a remap, but as far as just adding a plenum spacer or decats, the ECU seems cope quite well without a remap.

 

MotorDynes spacer just corrects one of Nissan design flaws by allowing more air into the front ports of the plenum. Following the instructions they suggest removing the negative side of the battery while installing. This allows the ECU to clear and relearn, which should be used when installing your intake/exhaust if you do so. I had two GTOs, a '65 four speed tri power and a '68 AT with everything in the book except the hood tach which I thought looked stupid at the time....Gary

 

Granted that the plenum is a case over form over function, and a spacer returns some of the flow that it should have had in the first place.
The disconnecting of the ECU power just clears the short term learning, not the programed limits that i was referring to.

 

You must live in Alberta? Similar tempatures here the last 2 days?

NA you will not see alot of gains from these cars. Cold air intake, Intake spacer and cat back exhaust maybe hi flow cats or resonagited test pipes with a tune is about as far as I would NA before the cost starts to out weigh the gains.

A guy in Edmonton makes a mid mount turbo system for our cars that gives a solid 400whp at $4500ish and if you are in Alberta Lightspeed Innovations in RedDeer is an Up-rev tuner.

 

I've spent about 2 grand on engine mods....with less than stellar results. Don't expect ANYTHING like you would on an american muscle car. These cars just don't respond well to bolt-ons. You're only going to see real power with forced induction. Not to be debby-downer or anything....just speaking from my personal experience.

 

Ya, in Calgary. - 30 this am.
Thanks for all the advise everyone!

 

you win. :-)

i haven't seen mine much below 40F

 

Ha! I had that same temp on my car this morning too, forgot to plug it in and she barely started

 

I'm an old HotRodder too, I've had V8 Vega, 427 Nova, 440 Coronet, Pro Street Dart. Agree with Sylvan, your wasting your time and money investing in CAI, spacers and ETC If looking for power too push you into the seat than FI is the only way to go with a V6 powered G35.

Had CAI on the way and decided only true power gains was with FI. Had my car for 8 Months and 7800 miles on odometer when Vortech S/C installed 7 years ago.

Its something to consider if your looking for real HP