Disappointing Dyno #'s...

[Mark B]

Hey everyone,
Had the car dynoed this weekend. I did four pulls, the first one was the best. 158hp/255ftlbs corrected. I was pleased with the torque numbers, but the horsepower was a bit low from what I expected. The engine has 170hp/255ftlbs stock @ the flywheel. I have added:

Headers
Intake w/ K&N
High-Flow Cat
Cat-Back
Hotter ignition
Aluminum Driveshaft

If you add 15% drivetrain loss to the dyno numbers, you get 181hp/293ftlbs. How can those mods add almost 40ft/lbs but only 11 hp? Does that sound right? I will post up the dyno chart which includes A/F ratios later today.

[raroZ28]

numbers aren't too far off. I wouldn't expect much more than 20 rwhp for exhaust and cold air.

[ConElite]

THats just about right. I had a feeling it was around that. Although its a V8 it still not as powerful than the 5.7 LS1/LT1. Dont be disappointed. Now you know a big, bettter, bad engine is called for, or some Internal work. Ha Ha

[Craig 94 TA GT]

Do you have the A/F ratio?

[Mark B]

It stayed between 12:1 & 13:1 pretty much the whole time. Between 3600rpm & 4100rpm it jumped up to about 13.5:1.

[Craig 94 TA GT]

13.5 is starting to get pretty lean. Do you have an exhaust leak? Where did they stick the wideband O2 sensors?

[Mark B]

The wideband was stuck into the tail pipe. No exhaust leaks from what I can hear.

The website I usually use to host my photos is being gay. Anyone know of a free one that I can use or maybe wants to host the dyno chart for me for a little while?

[MunsonGTA]

why did you assume 15% loss through the tranny? does your car have a manual?

[Mark B]

Yeah my cars a stick.