Von Hep exhaust dyno'd - LotusTalk - The Lotus Cars Community
 
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post #1 of 6 (permalink) Old 10-20-2006, 05:54 PM Thread Starter
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Von Hep exhaust dyno'd

Hey guys,

I got a chance to do before and after dynos for my Von Hep exhaust. First off... it saved over 20 lbs so I'm happy with that aspect Second, I ran the car HARD for 2 full tanks of gas so the ECU could re-learn any possible gains away.

Ironically the atmospheric conditions were almost identical between the two runs.

Baseline: 81.56 degrees F, 27.30 in-Hg, 11% humidity

Von Hep: 81.58 degees F, 27.35 in-Hg, 13% humidity

Using the "aftermarket part seller" technique I gained 5.56 HP and 3.26 ft lbs of torque. This is comparing the worst baseline to the best after run. I decided it was more even to compare the best baseline run versus the worst after run. Using the honest method I gained 1.53 HP and 1.80 ft lbs of torque (I'm attaching this dyno graph to be more realistic). The cool thing is that there was an increase in torque across the entire RPM range. Especially under 3000 rpm This was apparent on every run

It sounds GREAT. Quieter then a stage II but deeper sounding then an Arqray single tip. I love tunnels as the car sounds like a pure racecar under WOT at high RPM

Any questions?
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post #2 of 6 (permalink) Old 10-20-2006, 07:29 PM
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thanks for posting
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post #3 of 6 (permalink) Old 10-20-2006, 07:37 PM
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Well at least it didn't lose any power. Thanks Bane!


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post #4 of 6 (permalink) Old 10-24-2006, 07:47 AM
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Thanks for posting.

Neil

WTF people?
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post #5 of 6 (permalink) Old 10-24-2006, 10:37 AM
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I knew my Butt Dyno was accurate. Now the question is how long b/f we loose the gain thanks to the ECU.
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post #6 of 6 (permalink) Old 10-24-2006, 10:58 AM Thread Starter
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Quote:
Originally Posted by LSUFAN
I knew my Butt Dyno was accurate. Now the question is how long b/f we loose the gain thanks to the ECU.
You can feel the slight gain? I have the worst calibrated butt-dyno in the world. It feels the same to me just sounds better and seems to rev more freely.

I increased the boost pressure on my Supra by 5 psi (rule of thumb: 50 horsepower) and didn't notice any difference. That goes to show how numb I am to power gains.

Well it still hasn't lost any power in 2 tankfuls of fuel. I will soon have access to unlimited (free) dyno sessions so maybe I'll report back in in about a month for a long term update
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