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Chain fence eating turbo
Join Date: Dec 2008
Location: Austin, TX
Posts: 9,141
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'87 Carrera ignition timing questions
So I might get more visibility than from my old thread About to run my '87 Carrera off a cliff - still surging and backfiring, I decided to ask a question separately.
Does the Carrera timing jump up right after the idle microswitch is deactivated? At idle, I am getting 5 degrees. Just barely crack the throttle, I get ~20 degrees Revving up from about say 2000-4000RPM, it climbs from 34-37/38 degrees. Revving it >4000RPM, it will hit 40 degrees. Now, Todd from Protomotive stated he bumps the idle timing up a lot due to the low-compression (7.5:1 for turbo) and 27-30 for WOT. I wonder if mine has to make boost to lower back down from the 40 I got to the 27-30 he says he maps it to? I know, go talk to the chip maker but I was curious if the timing jumps like this normally on a stock Carrera. 
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Cory - turbo'd '87 C3.2 Guards/Blk, 3.4, 7.5:1 CR, 993SS cams, Borg-Warner S366 turbo @ 1.2-1.5 bar, Treadstone full bay IC, 70mm TB, TiAL F46 WG, HKS 1 1/2" BOV, twin 044 pumps, MicroSquirt AMP'd w/GM smart coilpack, Bilstein coilovers, Tramont replica Speedlines (285's rr, 225's frt), Big Reds frt, 993 rr., tower brace, MOMO wheel Last edited by Tippy; 08-18-2011 at 02:38 PM.. |
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08-18-2011, 02:34 PM
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Chain fence eating turbo
Join Date: Dec 2008
Location: Austin, TX
Posts: 9,141
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I think I answered my own question.
The timing is programmed high for off-boost, 7.5:1 driving, then, the WOT switch backs the timing off for the boost. I think.....
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Cory - turbo'd '87 C3.2 Guards/Blk, 3.4, 7.5:1 CR, 993SS cams, Borg-Warner S366 turbo @ 1.2-1.5 bar, Treadstone full bay IC, 70mm TB, TiAL F46 WG, HKS 1 1/2" BOV, twin 044 pumps, MicroSquirt AMP'd w/GM smart coilpack, Bilstein coilovers, Tramont replica Speedlines (285's rr, 225's frt), Big Reds frt, 993 rr., tower brace, MOMO wheel |
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08-19-2011, 04:58 AM
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