Stillen Headers on 370z

LiquidZ · 03-22-2009, 09:52 PM

When will you post dyno info?

Valentino · 03-31-2009, 01:53 PM

Quote:

Originally Posted by LiquidZ

When will you post dyno info?

Funky370z · 04-03-2009, 09:09 PM

dyno info sorry for the delay guys
baseline

Headers

Funky370z · 04-03-2009, 10:35 PM

just for giggles here is my car at 667 miles in our shop.
YouTube - 370z Dyno relentlessrpm.com 279.6 HP and 241 ftlbsTQ

Brazilbro · 04-03-2009, 10:57 PM

am i reading this right, you lost 15 wtq and gained 6whp?

Josh@STILLEN · 04-03-2009, 11:09 PM

FYI.. These results are atypical to anything else we've seen from anyone, I'm passing these results on to our R&D staff, but the immediate thing is the difference in time in the dyno's, conditions.. it's not a back to back test.

After the cat-back install will be an interesting test.. still different days, different conditions, but will definitely benefit..

Black kNight · 04-04-2009, 06:58 AM

I expected to not get alot of gain due to the Y pipe is so restrictive and dont forget about the Cats
i think we can get more HP from headers after Installing HFC and cat-back

Funky370z · 04-05-2009, 11:30 AM

Quote:

Originally Posted by Black kNight

I expected to not get alot of gain due to the Y pipe is so restrictive and dont forget about the Cats
i think we can get more HP from headers after Installing HFC and cat-back

Yes I agree

More to come, just tight on funds.

370ZFan · 04-05-2009, 02:56 PM

Quote:

Originally Posted by RelentlessRY

dyno info sorry for the delay guys
baseline

Headers

I have a completely different theory on why the numbers are so strange.

Relentless,
Please don't take this as a personal attack, but you may want to get another dyno done because these are highly unlikely to be accurate.

Horsepower is (tq x revs)/5252. As such to make more horsepower, one must either a. make more torque at the same revs b. make same torque at higher revs or c. both.

The red line going straight down on your dyno plot is showing at what revs you are making the numbers listed at the chart.

Comparing dyno 1 to dyno 2:
Dyno 1, you are making 283.1 hp and 209.8 ft/lbs at around 7100 rpms - with the pull going up to around 7350 rpms (short of redline).

Dyno 2, you are making 288.6 hp but somehow making less torque at 195.2 so the only way for this to be possible would be to make it at higher revs, which you do according to the chart. Only problem is that it says that was revving 7775 rpms - past redline and that the pull went to almost 8000 rpms before letting up - which is past fuel cut.

My opinion: a faulty reading on what revs you were at threw off the reading. Truth be told, STRICTLY JUDGING FROM THE PLOT ALONE, it appears that you lost a significant amount of power throughout the curve - which would be shown if you put one on top of the other and shifted the plot left by 500 rpms to compensate for the clearly faulty RPM readings.

HOWEVER, I'll reserve judgment on whether you really lost power for your next dyno simply because there could have been other factors/errors which could have come into play, esp. if I am right on my faulty RPM read theory.

So in conclusion, I believe that well...these dynos are anything but conclusive on the topic of power gains from Stillen Headers.

RCZ · 04-06-2009, 12:49 PM

very good point

Funky370z · 04-06-2009, 08:27 PM

Quote:

Originally Posted by 370ZFan

I have a completely different theory on why the numbers are so strange.

Relentless,
Please don't take this as a personal attack, but you may want to get another dyno done because these are highly unlikely to be accurate.

Horsepower is (tq x revs)/5252. As such to make more horsepower, one must either a. make more torque at the same revs b. make same torque at higher revs or c. both.

The red line going straight down on your dyno plot is showing at what revs you are making the numbers listed at the chart.

Comparing dyno 1 to dyno 2:
Dyno 1, you are making 283.1 hp and 209.8 ft/lbs at around 7100 rpms - with the pull going up to around 7350 rpms (short of redline).

Dyno 2, you are making 288.6 hp but somehow making less torque at 195.2 so the only way for this to be possible would be to make it at higher revs, which you do according to the chart. Only problem is that it says that was revving 7775 rpms - past redline and that the pull went to almost 8000 rpms before letting up - which is past fuel cut.

My opinion: a faulty reading on what revs you were at threw off the reading. Truth be told, STRICTLY JUDGING FROM THE PLOT ALONE, it appears that you lost a significant amount of power throughout the curve - which would be shown if you put one on top of the other and shifted the plot left by 500 rpms to compensate for the clearly faulty RPM readings.

HOWEVER, I'll reserve judgment on whether you really lost power for your next dyno simply because there could have been other factors/errors which could have come into play, esp. if I am right on my faulty RPM read theory.

So in conclusion, I believe that well...these dynos are anything but conclusive on the topic of power gains from Stillen Headers.

I have a dyno at my place of business as this is what i do for a living and Josh from stillen will attest to that. The charts are auto populated by the dyno machine. Just for HAHA's sometime this week I am going to do another pull and report my findings.

side note you present many valid points but I have over 30 dyno runs already on the 370z and these are the average runs, not the highest not the lowest. I have made as high as 297 with the headers and as low as 277 rwhp. Temp has a lot to do with the results.

Funky370z · 04-06-2009, 08:28 PM

no personal attack taken btw we are all here to better the Nissan/370z community as a whole.

ryan

370ZFan · 04-07-2009, 11:38 AM

That's great that you have a dyno at your place of business! I'd probably be a happier person if I had such access to one!

Anyway, I understand when people get dynos done, its to add some objectivity to any subjective impressions we may have to a particular mod and as a result, I know a lot of people get offended when their dyno plots are questioned for one reason or another. Thanks for being understanding.

Finally, thanks for publishing your findings and I look forward to seeing your new dyno plots, which I hope will resolve some of the discrepancies.

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03-22-2009, 09:52 PM	#61 (permalink)
LiquidZ A True Z Fanatic Join Date: Nov 2008 Location: Columbus, OH Posts: 1,940 Drives: Mag. Black 2009 370Z Rep Power: 705	When will you post dyno info?

04-03-2009, 09:09 PM	#63 (permalink)
Funky370z Base Member Join Date: Feb 2009 Location: florida Posts: 65 Drives: 370z Touring Sport Rep Power: 256	dyno info sorry for the delay guys baseline Headers

04-03-2009, 10:35 PM	#64 (permalink)
Funky370z Base Member Join Date: Feb 2009 Location: florida Posts: 65 Drives: 370z Touring Sport Rep Power: 256	just for giggles here is my car at 667 miles in our shop. YouTube - 370z Dyno relentlessrpm.com 279.6 HP and 241 ftlbsTQ

04-03-2009, 10:57 PM	#65 (permalink)
Brazilbro A True Z Fanatic Join Date: Mar 2009 Location: Indianapolis, IN Posts: 1,131 Drives: Juke/240Z Rep Power: 848	am i reading this right, you lost 15 wtq and gained 6whp?

04-03-2009, 11:09 PM	#66 (permalink)
Josh@STILLEN The370Z.com Sponsor Join Date: Dec 2008 Location: Costa Mesa, CA Posts: 1,197 Drives: 2004 G35 Coupe 6MT Rep Power: 534	FYI.. These results are atypical to anything else we've seen from anyone, I'm passing these results on to our R&D staff, but the immediate thing is the difference in time in the dyno's, conditions.. it's not a back to back test. After the cat-back install will be an interesting test.. still different days, different conditions, but will definitely benefit..

04-04-2009, 06:58 AM	#67 (permalink)
Black kNight Base Member Join Date: Dec 2008 Location: Oman Posts: 239 Drives: Model 2003 MB C-180k Rep Power: 273	I expected to not get alot of gain due to the Y pipe is so restrictive and dont forget about the Cats i think we can get more HP from headers after Installing HFC and cat-back

04-06-2009, 12:49 PM	#70 (permalink)
RCZ A True Z Fanatic Join Date: Nov 2008 Location: Miami Posts: 6,403 Drives: '09 370Z Rep Power: 1119	very good point

04-06-2009, 08:28 PM	#72 (permalink)
Funky370z Base Member Join Date: Feb 2009 Location: florida Posts: 65 Drives: 370z Touring Sport Rep Power: 256	no personal attack taken btw we are all here to better the Nissan/370z community as a whole. ryan

04-07-2009, 11:38 AM	#73 (permalink)
370ZFan Base Member Join Date: Apr 2009 Location: Atlanta Posts: 2 Drives: '05 Acura TSX 6MT Rep Power: 16	That's great that you have a dyno at your place of business! I'd probably be a happier person if I had such access to one! Anyway, I understand when people get dynos done, its to add some objectivity to any subjective impressions we may have to a particular mod and as a result, I know a lot of people get offended when their dyno plots are questioned for one reason or another. Thanks for being understanding. Finally, thanks for publishing your findings and I look forward to seeing your new dyno plots, which I hope will resolve some of the discrepancies.