Strange dyno results
Thread Starter
Instructor
Joined: Sep 2008
Posts: 209
Likes: 14
From: houston texas
Strange dyno results
I just installed cai, 1-3/4 headers and Tsp 229/336 cam on a 08 ls3 m6. It made decent power but looks like it has a restriction. Look at the hump around 3500rpm. It starts making good power, then falls. This was through stock mufflers that have been modded with a hole drilled in the third chamber. Also, when I installed the pushrods, I only had 1/2-3/4 turns of preload. Figured I would order longer ones if they made noise, but they're quiet. Anyone have ideas?
Last edited by badass68; Nov 16, 2014 at 11:29 AM.
Racer
Joined: Jan 2014
Posts: 400
Likes: 37
From: Lone Star State
Is your car a manual or auto? I see m6 in your sig.
Was the car dyno'd more than once? And if so did the hump repeat.
Otherwise it might be caused by the dyno technician.
Also, in driving your car you would feel that torque spike between 2500 and 3500 rpm, do you at WOT?
Or is that a dyno artifact.
Was the car dyno'd more than once? And if so did the hump repeat.
Otherwise it might be caused by the dyno technician.
Also, in driving your car you would feel that torque spike between 2500 and 3500 rpm, do you at WOT?
Or is that a dyno artifact.
Last edited by Suds; Nov 16, 2014 at 06:50 PM.
Thread Starter
Instructor
Joined: Sep 2008
Posts: 209
Likes: 14
From: houston texas
Is your car a manual or auto? I see m6 in your sig.
Was the car dyno'd more than once? And if so did the hump repeat.
Otherwise it might be caused by the dyno technician.
Also, in driving your car you would feel that torque spike between 2500 and 3500 rpm, do you at WOT?
Or is that a dyno artifact.
Was the car dyno'd more than once? And if so did the hump repeat.
Otherwise it might be caused by the dyno technician.
Also, in driving your car you would feel that torque spike between 2500 and 3500 rpm, do you at WOT?
Or is that a dyno artifact.
Here's a overlay they gave me of my car vs. a camaro with the same cam and bolt ons , but bigger headers.
Racer
Joined: Jan 2014
Posts: 400
Likes: 37
From: Lone Star State
Ok, that's why you think there is a restriction. There is definitely an offset on your dyno curve vs. the Camaro, the odd thing is a exhaust restriction would create an increasing reduction in horsepower not just an offset as shown on the dyno curve.
