Hey all, I was wondering if a MBC would work on my 86 9000T B202.
Right now, i have a calibrated boost guage.
Base Boost at 5 PSI. I have a modded APC awaiting to be installed and a 3.0 Bar FPR.
Does my car have a LPT?
How far can I adjust my base boost with a modded APC. My APC has new resistors installed and is tweaked to SPG spec.
02-12-03, 04:07 PM
I don't see why you should use a MBC if you already have a modded APC. Anyway, it would work.
No,your car isn't an LPT.
As far as I know, base boost doesn't need to be adjusted when tweaking a APC. Maybe you could lower it a bit to, say, 3.5 psi to have more safety against knock, but a higher base boost would geve a better throttle response (faster spool up).
03-12-03, 10:00 AM
jack up the base boost to around 5.5. it will get you better overall performance. Also, what mods have you done to the APC?
Remember increasing the “boost” on a older car with mileage also increases engine wear.
Unless you are 100% sure of the engines condition I would recommend only moderate tweeking
My car's engine condition is top notch. had it compression tested, and its all good. I noticed a small prob. At base boost 5 psi, when she spools up, she hits around 9 psi, then seems to jump as if she hit knock. Never exceeds 10 psi. Any advice on this?
MBC would be useful for giving you a quick spool up but increasing base boost would give you bascially the same effect. I suggest that you up the base boost a bit and make sure that the APC is modded to Tweakers specs.
Hey guys, I got a new prob.
Seems like my APC is failing to kick on.
Sometimes on acceleration i hit around 5 psi and then the apc takes over to around 8-9 PSI then it goes back down to base and stays there. Any reflections on this? Seems like a controller is failing and not the APC. thnx.
18-01-04, 04:05 PM
Seems like you're in base boost mode, or that you go into it after a second you're boosting.
Search the forum for base boost, you'll find tons of info.
But if you suspect the controller (aka BPC valve), try to squirt some WD40 into it: I heard this isn't a permanent fix, but it should help for a while if the problem is there.
If you want to change it because WD40 is't enough, search scrapeyards-junkyards because Saab prices for that are silly.
I found the problem. The wiring harness for the APC wasn't pushed in all the way! LOL
Must have happened when i changed my brake light switch! :D
Ah well my 375,500 kms 9000 will keep on running strong!