I have a M2 stage three ECU, Apexi intake, SR Motorsports upgrade ic, HKS dp, mid-pipe, and Greddy Power Extreme cb. I cannot keep secondary boost below 0.9 kgf/cm2 (12.8 psi). I am trying to use setting A for a stock pattern (10-8-10). My primary boost (before 4500) is perfect but after transition boost keeps building all the way to red line (no spiking). I am using RPM specific settings and have duty set as low as it will go at 4500 rpm and beyond (20%). I never thought I would have too much boost after transition!

I think the unit is hooked up correctly because when I turn it off my primary boost goes to 7 psi as it should, but I still see the boost build up to 13 as it goes to red line.

I have the F/B speed set at default (3) for all gears. Self-learn is turned off. Start duty is set 0% for all gears as spiking is not a problem.

Is the fact that I am running a mid-pipe the problem? Is there just too much boost for the waste-gate to keep up? Please help!!

 

http://www.rx7turboturbo.com/robrobi..._r_install.htm

 

Thanks for the link but I have already used these instructions.

Ben

 

Your definitely gonna see boost creep with a mid pipe. need to have your wastegate ported to alleviate the problem. i don't think you are ever gonna get rid of it just make it better.

 

Same problem with high-flow cats?

 

pretty much, its a bit better because of the greater restriction but it is not as restrictive as the standard system.

porting the wastegate will help a bit though

 

To port to wastegate I assume you have to remove the whole turbo assembly and then send it out to someone? Any suggestions on who?

 

Yep turbos have to come off, it is a relatively easy but time consuiming procedure. jump over to the 3rd gen section and do a search there is tons of info over there.

 

Thanks for the help!

 

Ben,

What happens when you UP the duty cycle? Set FB to 1 in 3rd on up. Tell me your exact setting per rpm band. I'll reply with what mine is set to.

Also, we're doing a dyno day up here in Columbus on the 19th. Check the NE region forum if you are interested.

Regards

 

Will do as soon as we get some dry weather down here.

Thanks,
Ben

 

Ben,

My boost is almost rock solid, when I don't start messing with the duty cylces and have to re-learn the relationship of boost and duty cycles. We have similar mods, minus the mid-pipe. I think the duty cycle being set too low is the key. I can snap some shots of the settings if that helps you.

Regards