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Old 05-16-2005, 02:48 AM   #1
booimaghost
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Default Boost controller with cobb AP?

Im running cobb stage 2 and Im getting some boost spikes around 18-19 psi on the normal stage 2 93oct map. I was wondering if a turbo xs mbc could solve this problem and also give me a nice constant 15psi.

Will this work with the AP?
will this stop the spiking?

Thanks
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Old 05-16-2005, 03:00 AM   #2
Max Umbarger
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Don't know about the controller, but as for reference I have the same stg2 and I have peaked 18-20 pounds of boost, but usually regulates close to 16 pounds. I think it just depends on load, but that is why the AP recovers it back to the ~15-16 pound range.


>>MAX
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Old 05-16-2005, 04:25 AM   #3
FastWagon
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May be worth checking your vaccuum hoses. I have AP St.2 and I was getting some spiking to 18-20psi. I checked and had a small crack in the vacuum hose connecting to the actuator. About $0.10 worth of hose and the spiking is gone
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Old 05-16-2005, 04:49 AM   #4
Max Umbarger
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I just did my uppipe, while moving the turbo around I seen a broken vac line. This SOB was hard. It was hard al the way to controller under the shield. I did my best at wrapping with electrical tape.
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Old 05-16-2005, 06:16 AM   #5
booimaghost
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I actually just replaced all the hoses(and brass pill) near the turbo becaust I dident have the pill in place and with the cobb stage2 I was only hitting 9psi or so. It seems now I will spike around 17-19 and stay level at about 14-15. On my previous DSM I was spiking until I got a mbc and when I put it on I got instant steady boost with no spikes. I want to know if the AP will freak out if the stock boost system is overtaken.

Any one tryed this?
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Old 05-16-2005, 11:51 PM   #6
Max Umbarger
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maybe look for a cheap used one and give it a shot, then if it is okay reply with the news! Then you could sell the used one and buy a better one or just use the one you used to test with.
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Old 05-17-2005, 09:31 AM   #7
speedracer_sti
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Have you Downloaded the new version of Stage 2.. Just curious.. It may help you a little
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Old 05-17-2005, 02:31 PM   #8
TheRipler
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Did you reset the ECU after replacing the vac lines? It may still be trying to work too hard from old learning with the bad hoses.
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Old 05-18-2005, 06:53 AM   #9
booimaghost
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isent that bad if it spikes arounf 18 or so???
How do I prevent this spiking and get a nice constant level???
Do other cobb users get this spiking???
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Old 05-18-2005, 11:37 PM   #10
Darryl
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One thing you might try is to adjust the actuator length on your wastegate. Spikes might be cured by turning the connector out a half turn. Each car is different. On my car, I've turned the connector in as far as it will go, and I never see boost spikes. The ecu seems to learn the change in good time. My boost hits about 16 lbs before tapering off. BTW, old APS/Club_Spec kit here with stage2 93 octane reflash (not supported anymore by COBB)
do a search on adjusting the wastegate. it's simple enough to do. just takes a few minutes.
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Old 06-03-2005, 01:00 AM   #11
Max Umbarger
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I know I've adjusted the actuator length it seemed to make the spike less it still spikes but is way smoother.


MAX
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Old 06-03-2005, 01:01 AM   #12
Max Umbarger
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As for the vacuum lines, mine are very hard, also, I could not pull them off the solenoid on either end. Is there a trick? I wanted to just cut a slit in them and pull them off and replace but, if there was something more to just pulling them off I did'nt want to wreck anything. Figured I'd ask.

MAX
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