Heys guys, I was wondering if anyone has ran a intake, Dp, Mid-pipe and exhaust with a Greddy Profec B at 10 PSI??

So what I want to know is can the Profec B keep the boost at stock levels(without spikes) with these mods done??

I have a Intake, Dp, and Catback w/ a Profec B and it is working fine at holding below 10 PSI, would a mid-pipe and maybe a FMIC be too much for it to control??

Thanks Justus

(BTW I have a PFC I just need to get it checked and tuned )

 

It has nothing to do with the Profec B. Once you've exceeded the capacity of the wastegate, it doesn't matter whether you're running a $20 Home Depot manual or a $500 AVC-R, you'll still get boost creep.

Some cars boost creep with a midpipe and some don't. What I don't understand is why anyone would want to deal with all the penalties of a midpipe and then only run 10 psi.

 

I want to run with a mid-pipe at 10 psi b/c I don't have my PFC hooked up and tuned yet. If I exceed 10 psi I will have a good chance of losing my motor. Does a resonated mid-pipe help lower the chance of boost creep b/c of the interuption of air flow?

So, how do you know when you have exceeded the capacity of the wastegate?

Thanks for the reply!

Justus

 

Then don't install the midpipe yet.

If I exceed 10 psi I will have a good chance of losing my motor.

Yep. So don't install the midpipe yet.

Does a resonated mid-pipe help lower the chance of boost creep b/c of the interuption of air flow?

Nope.

So, how do you know when you have exceeded the capacity of the wastegate?

When your boost starts "creeping" higher than what you have your boost controller set to.

A midpipe is a serious mod, whether many people here treat it that way or not. I would never install a midpipe with the stock ecu. Personally, I wouldn't install a midpipe until I had an upgraded fuel system, a PFC, and someone to tune it.

 

Hey, Thanks a lot for the post and sorry for the lack of knowledge on my part

Sounds like I have a ways to go before I will be putting one in.

Looks like I will be going FMIC, PFC tune, fuel pump, then maybe a mid-pipe depending on the tuning results.

Justus

 

I closed the poll as rynberg has already provided the needed information.

 

You may run a midpipe if you create a restriction such a 2 1/2" flange on one end of the midpipe. This might create enough back pressure to maintain 10psi.

Rynberg

For a road race car running 10psi with open exhaust is a good idea for optimizing power, and getting heat/back pressure out of your motor. As long as AFR are wide band reasonable 11-1 and creep is controlled, you can do this with a stock ECU.

 

I agree that running 10 psi with a midpipe is probably easier on the turbos than running 10 psi with a cat. However, very few owners here track their cars. I'm guessing that Syder wants to run a midpipe for the power gain, and not for being easier on the turbos on a road course.

Yes, you can, but I still wouldn't risk it.

I have never understood the point of doing this. If your restrictor plate is creating enough backpressure to maintain 10 psi, then why are you running a midpipe in the first place? Just keep a cat in, it will be the same performance.

 

Rynberg

Regarding the 3" midpipe with 2 1/2" flange, I have no data to support this approach, however since there is no converter matrix, it stands to reason that the flow would be higher than the stock cat. With a flange you are looking for just enough back pressure to control boost creep. I am not sure what that CFM number is however I am sure you would post some higher RWHP on a dyno......... and move some significant heat out of the motor....