Am I experiencing boost creep??
#1
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Am I experiencing boost creep??
Today I've installed a midpipe in my FD. I'm also running a Pettit Racing Unlimited ECU, intake, downpipe, catback and IC. As soon as I've installed it I've gone for a ride in order to tune up my greddy profec B for my new setup.
My boost controller works great, and I had two setups, for 10 and 12 psi. But now, with full exhaust, everything has changed. It doesn't matters how I tune the profec B, with some different settings I've experienced always the same result: The more I rev the car at full throttle, the more the turbo blows. I have hitted 15 psi at around 7K rpm, and I have tried with tons of different settings. The response is different when I play with the profec, but the problem is always there, my car doesn't stop to blow, higher and higher.
Is this what you call "boost creep"?? I've a track day on sunday at Montmelo international circuit, and I wanted to run full exhaust but I think I won't be able to if I don't solve this problem...
My boost controller works great, and I had two setups, for 10 and 12 psi. But now, with full exhaust, everything has changed. It doesn't matters how I tune the profec B, with some different settings I've experienced always the same result: The more I rev the car at full throttle, the more the turbo blows. I have hitted 15 psi at around 7K rpm, and I have tried with tons of different settings. The response is different when I play with the profec, but the problem is always there, my car doesn't stop to blow, higher and higher.
Is this what you call "boost creep"?? I've a track day on sunday at Montmelo international circuit, and I wanted to run full exhaust but I think I won't be able to if I don't solve this problem...
#2
ya that is boost creep. you are running the twins still right? I get it with the same exhuast mods in the winter time, because the colder air temps. In the summer i never see any creep, you are going have to port your turbos to make it go away. They also had a plate you could put in ur exhuast to cause more back pressure but thats just a bandaid fix.
#5
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Yep. Boost creep. I have never been able to control boost in cold weather on any of the 4 turbo rotaries that I've owned over the years when I had an open exhaust. Best thing that worked for me was to introduce a restriction into the exhaust to allow just enough restriction so that a boost controller could keep things in control.
The latest thing that worked for me was to add a metal cat to the mid pipe I was running. See pic
The latest thing that worked for me was to add a metal cat to the mid pipe I was running. See pic
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Yeah, that's what I thought. I won't be able to get any restrictor plate for sunday, and I won't port my wastegate cos I don't want this "loud" setup forever I will put my hi-flow cat again and run with it... Thanks for the info
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#11
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take the pill out of the line going to your profec b, not the pre-spool hose(leave that alone). take the pill out and plug the hose back in to your greddy box. now redo your boost controller settings(put balance and low-high boost back to 0). with the boost controller off you should be pulling 7psi with all settings low. this is just to make sure its working correctly. now tune your profec b for the boost level you need.
this is for the profec b boost controller only, not the spec II
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wow..you have a profec b installed and still have the pill in the wastgate line?? the pill is what gives you the 10psi with the stock setup...
take the pill out of the line going to your profec b, not the pre-spool hose(leave that alone). take the pill out and plug the hose back in to your greddy box. now redo your boost controller settings(put balance and low-high boost back to 0). with the boost controller off you should be pulling 7psi with all settings low. this is just to make sure its working correctly. now tune your profec b for the boost level you need.
this is for the profec b boost controller only, not the spec II
take the pill out of the line going to your profec b, not the pre-spool hose(leave that alone). take the pill out and plug the hose back in to your greddy box. now redo your boost controller settings(put balance and low-high boost back to 0). with the boost controller off you should be pulling 7psi with all settings low. this is just to make sure its working correctly. now tune your profec b for the boost level you need.
this is for the profec b boost controller only, not the spec II
This is the installation I did when I installed my boost controller:
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