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APC-tweaks
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Posted by Gerhard (more from Gerhard) on Sat, 6 Jan 2001 10:44:22 Share Post by Email
In Reply to: Re: Survey: mileage on your cars..., Craig, Fri, 5 Jan 2001 17:02:42
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I did usual "DIY" tuning stuff, open-air K/N filter, 2,5" exhaust and tweaked APC.

APC is very easy to modify, especially after exhaust upgrade when it needs to be tweaked to avoid boost pressure overshoot.

There are three small trim potentiometers on APC box named K, P and F.

P is "gain", too much and boost will start going up and down. Turn it clockwise app. 20 degrees.

K is knock sensor sensitivity and shouldn't be fiddled with as long as you want your pistons alive and well.

F is connected in series with pressure transducer and regulates amount of boost that APC goes to at higher RPM. (boost tapper)

In my expirience, best results are gained with 25 deg. P and 20 deg. F. (all clockwise).

All this is for Bosch LH / Analog APC only!!!! Sport exhaust relieves termal strain on turbo and is recomended before you strat tweaking your APC.

Yes, i run with stock fuel pressure regulator, (it seems O.K. as long as you aren't boosting more than 1.05 bar). Fuel consumption suffers when you run rich with raising pressure regulator.


Of course, do it on your own risk. There some other things that might need help, like clutch etc. Bring all other stuff up to date before. I never dyno-ed my car but i can run from Subaru Impreza Turbo on motorway at higher speeds. (No good stop-light racer beacuse of turbo-lag).

Good luck.



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