GM Boost Solenoid - EVO X
I do have 3 connectors left which you can use to fab up a plug and play harness. I did NOT use any resistors with mine, by the way. If you want, text me at 203-520-7162 tonight with your address and stuff and I'll send you one. Or... I can mail it directly to Chris @ EFI.
- Lou
- Lou
Let's take this to PM.
we've tested them side by side (on an evo) and the duty cycle/boost curves are nearly identical. although i have found some very unusual characteristics with the GM when approaching 100% duty. i wasn't sure if it was due to the setup or the valve though. the unusual characteristics were that when ramping up duty cycle to hold boost up top, once it got above 96% the boost would suddenly jump from 24psi to 30+. i haven't seen this with a mac valve yet.
when the solenoid deactivates it would go back to wastegate pressure. only way for it to spike is if it is on, and at 100% duty. it was really odd. but it was also repeatable (on this one car), and i have logs from it (on my laptop at home). also, note that it was on an evo 8 that it was doing this.
Logged example:
I've probably tuned 40-50 GMBCS's with no loss of boost control over a certain WGDC if the solenoid deactivate RPM was tuned. I'm leaning towards setup,install or WGA/EWGA issue.
fyi, I'm not pointing fingers at you or saying you don't know what you are doing, just trying to get to the bottom of your 'issue'.
Last edited by GST Motorsports; Aug 10, 2009 at 01:48 PM.
figured out why it was acting weird 
i'll give you a hint. evo 9, FP red. MAX boost we could squeeze out was 28.6psi at 5100 (thats how slow it was to spool), and it tapered to 23-24psi by 6000rpm and held that to 8000rpm (with the forge MBC... with the GM3 port it would jump back up to 26-29psi after 6500-7000ish rpm). absolutely couldn't do better...
i'll give you a hint. evo 9, FP red. MAX boost we could squeeze out was 28.6psi at 5100 (thats how slow it was to spool), and it tapered to 23-24psi by 6000rpm and held that to 8000rpm (with the forge MBC... with the GM3 port it would jump back up to 26-29psi after 6500-7000ish rpm). absolutely couldn't do better...
Last edited by KevinD; Aug 13, 2009 at 11:35 AM.
we've tested them side by side (on an evo) and the duty cycle/boost curves are nearly identical. although i have found some very unusual characteristics with the GM when approaching 100% duty. i wasn't sure if it was due to the setup or the valve though. the unusual characteristics were that when ramping up duty cycle to hold boost up top, once it got above 96% the boost would suddenly jump from 24psi to 30+. i haven't seen this with a mac valve yet.
and the valves not having any effect until 40% is common with all controllers. even manual controllers require a few turns before they make any difference at all.
and the valves not having any effect until 40% is common with all controllers. even manual controllers require a few turns before they make any difference at all.
Not sure what was going on, but the car had some issues holding boost til redline properly. I had Chad Block at CBRD tune my car, and he noted that the MAC type valve required more duty cycle to hold a certain boost level compared to a GM 3 port. Not sure if it was the way we tried to tune the car or the valve, but we maxed out the MAC valve in the upper RPM range. This was with a FORGE WGA as well. Not sure what it was.
So why are you switching? I'm wondering what I should do no that I want t hit high psi on my Red / E85. Currently have HKS WGA and AMS MBC. AMS will tune. Is there a better setup option?
I didn't switch, I just use a different solenoid setup. I said the ECU has good boost control capability within its maps, etc.
Thread
Thread Starter
Forum
Replies
Last Post
Evo_Jay
ECU Flash
559
Nov 1, 2018 10:01 AM
mrfred
ECU Flash
33
Sep 29, 2008 11:50 PM
MalibuJack
General Engine Management / Tuning Forum
34
Aug 3, 2004 07:36 AM
