1979-1993 & 94 Conv [Subscribe to Daily Digest] |
[Main C900 Bulletin Board | BBFAQ |
Prev by Date | Next by Date | Post Followup ]
Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos
Re: There is a way ... Posted by Justin VanAbrahams [Email] (#32) [Profile/Gallery] (more from Justin VanAbrahams) on Wed, 21 Jan 2015 10:50:00 In Reply to: There is a way ..., RS [Profile/Gallery] , Wed, 21 Jan 2015 06:11:07 Members do not see ads below this line. - Help Keep This Site Online - Signup |
The pressure curve is actually really simply - it's 10ohms per psi, or very close to that. It actually kind of doesn't matter, because if you are fooling with the pressure transducer you have full control over the APC system. If it only had three resistances - 10ohms to pass the test, ~100ohms as "approaching max boost, please cycle" and somewhere between 130ohm and 150ohms as "full boost." The actual values may need tweaking, but that would be very close. By futzing with the pressure sensor values you could then set boost to whatever you wanted.
As for emulating the APC function, I don't think the knock sensor is that rough from a hardware perspective. I'm sure that is all fairly well documented with Megasquirt etc., as you're just looking for a specific waveform. I think there are even OTS ICs which do this. The issue would be tuning for the Saab motor (every motor is different). Getting a useful result might be really tough.
I'd settle for a pressure transducer emulator. Truly, if I was going to replace APC entirely there are existing solutions that do the same thing, plus or minus. Maybe the right approach is just switch to T5 and tell the California BAR that I did a motor swap from a '94 900T. Hmph.
posted by 12.195.130...
No Site Registration is Required to Post - Site Membership is optional (Member Features List), but helps to keep the site online
for all Saabers. If the site helps you, please consider helping the site by becoming a member.