Use a Turbo ECU - Saab Performance Bulletin Board - Saabnet.com
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Use a Turbo ECU
Posted by Hans (more from Hans) on Mon, 13 Oct 2008 20:09:04
In Reply to: Re: 89 900 LPT, JPn, Mon, 13 Oct 2008 05:09:51
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I tested a non-turbo ECU in a turbo conversion car and found (with a wideband O2 sensor) that the ECU did not do too much to enrich the mixture upon hard boost.
If you fit an intercooler, swap in a Turbo intake cam (which drops trapped compression a bit), keep the stock NA 3 bar regulator, add Turbo injectors, use premium fuel only, and install an APC, you should be able to run stock boost levels. You don't need to change the harness for the APC -- many non-Saab turbo cars are driving around with APCs fitted; all that's needed is 12V. Stack the APC knock sensor on top of the existing EZK sensor; use a long bolt for both of them. For peace of mind, have the Turbo inj's professionally cleaned/tested.
As for your timing, I assume you are using the Hall sensor signal from the Turbo distributor and NOT the signal from the crankshaft sensor? If you are using the crank signal, then the Turbo dist. is doing nothing for you (timing changes are NOT mechanically actuated, e.g., with weights, they're pneumatically actuated ONLY, with vac/pressure): the ignition signal must come from the Turbo dist.
What I did on my '86 conversion is shove a washer perpendicular and under a notch in the vac. capsule arm to prevent it from moving up under vacuum and therefore advancing timing, but allowing it to travel down to retard under boost. I let the EZK handle advance instead. (Grind a slot in the washer to fit.)
Your timing will no longer be automatically set at this point: twist the dist. to get 16*BTDC static with the vac hose removed/plugged.
posted by 216.160.10...
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