1985-1998 [Subscribe to Daily Digest] |
![]() | [Main 9000 Bulletin Board | BBFAQ |
Prev by Date | Next by Date | Post Followup ]
Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos
Only part of the story Posted by Ari [Email] ![]() ![]() In Reply to: Ditching the TCS on a 93 - can someone explain this?, Smeter, Mon, 4 Nov 2002 20:58:48 Members do not see ads below this line. - Help Keep This Site Online - Signup |
You've got it right.
Not only do you need to install a non-TCS throttle body, but you need to install a throttle pedal (gas pedal) and cable from a non-TCS car. TCS cars are essentially drive-by-wire, with an electronic sensor measuring throttle pedal position, and driving a motor at the throttle body. That's the downfall of the TCS system - Saab didn't do the best job with the throttle-by-wire system, and every time it thinks it sees a problem, it drops back into limp-home mode.
Manual transmission cars have a cable, but it has only limited authority. Automatic tranny cars are pure drive by wire.
The TCS works by a combination of applying the brakes and cutting back on the throttle, depending on the speed of the car and the type of transmission. Since the TCS control unit is the one to actually move the throttle, if it sees slip, it just cuts back on the throttle plate opening. The ECU sees less air coming in, and cuts back on fuel.
If you install a non-TCS throttle body and gas pedal/cable, now you control the throttle plate opening. If the wheels spin, the TCS unit can't control the throttle, and the ECU gives you all the gas you want.
Make sense?
posted by 12.79.58...
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.
![]() |
![]() |
![]() |
![]() |
![]() |