I dynoed my car a few weeks ago and I am still puzzled why my hp drops off significantly after 6800 rpms. The cams in the car are Jun 272 exhaust and Jun 264 on the intake. Cam marks are pointing straight up and the crank is at zero. I do not have gears but most guys leave them at zero anyways.
I have a couple ideas of what could be the actual issue but I am looking for other suggestions. My first thought was a major boost leak or my tune. Since then I have fixed both and my fuel map still says that power is dropping off. Reason I know this is at 6800rpm I have to take out a portion of fuel to keep my AFR at 11-11.3.
My first idea is that the turbine AR is too small and is thus restricting flow. I guess it could be my exhaust but I am running a 3inch downpipe to the BIC 3 1/2 inch catback.
My other idea is something is not right with the cams but there is not many ways to mess up cams. Even with a tooth being 1 off the car would run like junk.
Any suggestions?
BTW the turbo is an Apexi IHI C7(66mm) and I have no clue how big the exhaust side is. I get 20psi by 4400rpms.
Maybe it is just me but the torque curve is pretty impressive and seems to hold on for a long time.
I have a couple ideas of what could be the actual issue but I am looking for other suggestions. My first thought was a major boost leak or my tune. Since then I have fixed both and my fuel map still says that power is dropping off. Reason I know this is at 6800rpm I have to take out a portion of fuel to keep my AFR at 11-11.3.
My first idea is that the turbine AR is too small and is thus restricting flow. I guess it could be my exhaust but I am running a 3inch downpipe to the BIC 3 1/2 inch catback.
My other idea is something is not right with the cams but there is not many ways to mess up cams. Even with a tooth being 1 off the car would run like junk.
Any suggestions?
BTW the turbo is an Apexi IHI C7(66mm) and I have no clue how big the exhaust side is. I get 20psi by 4400rpms.
Maybe it is just me but the torque curve is pretty impressive and seems to hold on for a long time.
Last edited: