Good idea... but is it safe ? - Saab Performance Bulletin Board - Saabnet.com
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Good idea... but is it safe ?
Posted by Newbe 900 (more from Newbe 900) on Fri, 30 Jul 2004 15:11:08
In Reply to: 1+2nd boost < 3,4,5th. Rewire ECU to always think to be in 5th?, Eric, Sat, 4 Aug 2001 14:47:17
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If as has been suggested
"...the ECU uses the ABS speed sensor to determine vehicle speed, then correlates this with engine RPM to figure out the selected gear."
Then...
Fooling the "engine speed sensor" seems sure to result in running issues whilst "putting a square wave in to make the ECU think the car is doing 70 mph" would seem to mean using that square wave instead of the ABS sensor. Not only does that not sound safe, but braking at any speed other than 70 mph would result in the ECU thinking one of the wheels was going at a different speed to the others and trying to correct it. Not good.
I like the idea of being able to disable the boost limitation in first and second gears under driver control (rather than using a MBC) but this thread is making me think it is easily acheivable.
unless of course it is simply a switch that indicates selected gear
posted by 67.165.77...
Posts in this Thread:
- 1+2nd boost < 3,4,5th. Rewire ECU to always think to be in 5th?, Eric, Sat, 4 Aug 2001 14:47:17
- You will get 90% of this effect with a series MBC n/m, SteveW, Fri, 30 Jul 2004 17:22:43
- Good idea... but is it safe ?, Newbe 900, Fri, 30 Jul 2004 15:11:08 <-- Viewing This Message
- Well..., LDH, Sat, 4 Aug 2001 15:56:08
- How do I build a circuit to fool computer? LDH Help!!!, Eric, Wed, 29 Aug 2001 13:15:02
- Re: Well..., eric, Sun, 5 Aug 2001 15:54:33
- Unfortunately, no..., LDH, Sat, 4 Aug 2001 18:15:53
- isn't there a fuse for the shift up light? There was in my '88 nm, steveCi nBC, Sat, 4 Aug 2001 17:11:18
- Re: 1+2nd boost < 3,4,5th. Rewire ECU to always think to be in 5th?, Brad, Sat, 4 Aug 2001 15:31:16
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