5/16 spacer installed no improvments over stock or 5/8 skunk 2
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Joined: Dec 2006
Posts: 547
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From: SIoux Falls SD
Originally Posted by DaveB
Go for it. The track is Kansas City International Raceway in KCMO. It's situated at ~1,050'. Same setup (1/4 tank fuel, no spare).
Z-tube conditions:
11/21/05
45 degrees
30.20 baro pressure
30.0 dew point
calculated DA 183'
MD 5/16" spacer, Z-tube conditions:
11/21/05
57 degrees
29.99 baro pressure
28.9 dew point
calculated DA 1157'
The spacer works. My traps were in the 98.8-99.9mph range all day. The tailwind would account for some of the gain in mph, but the air density was a bit lower so it was a wash.
Z-tube conditions:
11/21/05
45 degrees
30.20 baro pressure
30.0 dew point
calculated DA 183'
MD 5/16" spacer, Z-tube conditions:
11/21/05
57 degrees
29.99 baro pressure
28.9 dew point
calculated DA 1157'
The spacer works. My traps were in the 98.8-99.9mph range all day. The tailwind would account for some of the gain in mph, but the air density was a bit lower so it was a wash.
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From: SIoux Falls SD
Originally Posted by DaveB
I was making passes between 1230pm and 330pm.
but either way if you did the runs on the same day, barometric preasure or any other variable that could effect performance did not change much at all, maybe wind was the only thing that could of changed things a little and if you say you had 10mph tail wind on your run with the spacer that would explain the 2mph gain on the 1/4 mi but your time is still slower even with the wind.
So conclusion by looking at this data:
at best you have gained no power with the spacer, at worst possibly even lost some power
link with the weather history of November 21 the day of the runs http://www.wunderground.com/history/...ename=Missouri
10:53 AM 48.9 °F / 9.4 °C 34.0 °F / 1.1 °C 56% 30.07 in / 1018.2 hPa 10.0 miles / 16.1 kilometers WSW 9.2 mph / 14.8 km/h / 4.1 m/s - N/A Clear
11:53 AM 54.0 °F / 12.2 °C 35.1 °F / 1.7 °C 49% 30.05 in / 1017.6 hPa 10.0 miles / 16.1 kilometers West 8.1 mph / 13.0 km/h / 3.6 m/s - N/A Clear
12:53 PM 55.9 °F / 13.3 °C 35.1 °F / 1.7 °C 45% 30.05 in / 1017.6 hPa 10.0 miles / 16.1 kilometers NW 12.7 mph / 20.4 km/h / 5.7 m/s - N/A Clear
1:53 PM 57.0 °F / 13.9 °C 37.0 °F / 2.8 °C 47% 30.04 in / 1017.2 hPa 10.0 miles / 16.1 kilometers NW 13.8 mph / 22.2 km/h / 6.2 m/s - N/A Clear
2:53 PM 57.9 °F / 14.4 °C 37.0 °F / 2.8 °C 46% 30.04 in / 1017.1 hPa 10.0 miles / 16.1 kilometers NNW 11.5 mph / 18.5 km/h / 5.1 m/s - N/A Clear
3:53 PM 57.0 °F / 13.9 °C 35.1 °F / 1.7 °C 44% 30.05 in / 1017.5 hPa 10.0 miles / 16.1 kilometers North 10.4 mph / 16.7 km/h / 4.6 m/s - N/A Clear
O and by the way your correction factor on the dyno for time period from noon till 4 pm was 0.990 , this means you are making 101% of your rated factory HP this was a good day to do runs. Most days when i do runs here im at 96% 97% of rated power so thats like running at 250 hp compared to yours at 263
Last edited by infinitialex; May 21, 2008 at 07:17 PM.
I'm not sure what you're talking about here? Yes, on the day I ran with just my z-tube, the conditions were stellar, at least for Kansas City. It was basically sea level air. When I ran with my spacer, the DA conditions were about 1,200'. I ran 14.32@97.6mph in sea level air and a 14.37@99.8mph in 1,200' air with a taillwind. Using the NHRA correction factor for 1,200' (.9874 for ET, 1.0129 for MPH), the car would have technically run 14.188@101.08mph. Like I said before, the tailwind was accounting for some MPH increase on the far end so wipe away 1 to 1.5mph. The end result is .14 seconds and 1.9mph in favor of the spacer. Yes, conditions change slightly during the day, but I'm only running over the span of a few hours and no major weather events were occuring. Chances are track temps on the day I ran with spacer were probably closer to mid 60s because it was very sunny and the breeze was straight out of the south.
For my car, the spacer works.
For my car, the spacer works.
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From: SIoux Falls SD
Originally Posted by DaveB
I'm not sure what you're talking about here? Yes, on the day I ran with just my z-tube, the conditions were stellar, at least for Kansas City. It was basically sea level air. When I ran with my spacer, the DA conditions were about 1,200'. I ran 14.32@97.6mph in sea level air and a 14.37@99.8mph in 1,200' air with a taillwind. Using the NHRA correction factor for 1,200' (.9874 for ET, 1.0129 for MPH), the car would have technically run 14.188@101.08mph. Like I said before, the tailwind was accounting for some MPH increase on the far end so wipe away 1 to 1.5mph. The end result is .14 seconds and 1.9mph in favor of the spacer.
For my car, the spacer works.
For my car, the spacer works.
it says both runs were on Nov 21
Last edited by infinitialex; May 22, 2008 at 12:27 AM.
This is all coming from the guy who thought the eBay "straight through" universal muffler would give him gains?
If I'm not mistaken, it was something like this that you thought would give you gains.
https://g35driver.com/forums/g-spot/131533-interesting-results-after-performance-muffler-install.html
If I'm not mistaken, it was something like this that you thought would give you gains.
https://g35driver.com/forums/g-spot/131533-interesting-results-after-performance-muffler-install.html
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Joined: Dec 2006
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From: SIoux Falls SD
Originally Posted by aHero4Eternity
This is all coming from the guy who thought the eBay "straight through" universal muffler would give him gains?
If I'm not mistaken, it was something like this that you thought would give you gains.
https://g35driver.com/forums/showthread.php?t=131533
If I'm not mistaken, it was something like this that you thought would give you gains.
https://g35driver.com/forums/showthread.php?t=131533
anyone that does a decent amount of research will realize there is plenty (actually way more than needed) of information all over various forums, at dyno days, in magazine tests, independent shops (more than a couple)...
If you are too lazy to do the research you don't warrant the response for me to "show you"...
This is the only 4 page thread I've seen that has ONE person going on and on about MD spacer not providing gains... there are hundreds of pages from hundreds of users that do show gains.
Doesn’t take a rocket scientist to figure out this thread is pointless. And yes, I felt compelled to state my opinion (and facts) in a pointless thread.
If you are too lazy to do the research you don't warrant the response for me to "show you"...
This is the only 4 page thread I've seen that has ONE person going on and on about MD spacer not providing gains... there are hundreds of pages from hundreds of users that do show gains.
Doesn’t take a rocket scientist to figure out this thread is pointless. And yes, I felt compelled to state my opinion (and facts) in a pointless thread.
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Joined: Dec 2006
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From: SIoux Falls SD
Originally Posted by Jeff92se
infinitialex. how did you quantify your fan delete gains?