I just had my tuning appointment today after a clutch and larger injector install. I was running about 75% c16 and 25% 93 octane so we pulled some timing. The numbers are poor at best for what we were expecting. Any idea of what could have caused these numbers?? He is a fairly good tuner. sc61 with .63 hot side, 3mm IP gasket and AEM EMS. We were around 19-20 psi on these pulls.






This is the plot from last summer at around 13.5 psi on a 50/50 mix of 110 and 93 octane.

 

What manifold?

 

IP log.

 

6152e compressor

 

that log manifold is going to spool up slower, effecting the midrange, and flow less up top, effecting your top end. just changing to a tubular manifold will give you power all over.

 

^ I need to find a good deal on one and then re-plumb the hot side piping. I think I need a larger hot side turbo housing aswell.

 

^I agree, what exhaust are you running, single dual. I think your number are pretty good, close to 450hp. Last I checked that pretty bad ass.

 

With the setup you're running...19-20psi and just under 450hp seems about right. Remember it's not all about psi...it's more about cfm and temp and with the log mani and that turbo I'd say you're pretty limited. Go with a tubular mani and ball bearing turbo (unless that already is but I believe it's journal) and you'll see a better number with lower psi...but I'm no expert so take it for what it's worth...that psi would get you closer to 480-500 with a slightly better setup.

 

single exhaust 3" all the way back no restrictions.

 

A log manifold + small turbine housing will definitely reduce your efficiency (and the horsepower for any given boost level).

Tim