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Your NA 92's LH2.4.2 harness can be converted to run LH2.4, which is what the Turbos from 88+ had. Off the top of my head, you'll need to deal with the Turbo throttle switch (you'll need the whole throttle + switch from the Turbo donor), but you'll want to look at the wiring diagrams in your Bentley for more info, as I haven't done this, only read about it.
APC is standalone and, aside from going through the fuse box, is basically separate from wiring harness, so can be installed without installing the entire Turbo harness.
All that said, if you're looking for an obsessive-compulsive, perfect switch to turbo, then best bet is to do the whole harness.
Use a Turbo distributor and get the tach signal from it, not the crank sensor. Defeat the vac advance by disallowing the vac. capsule arm from going up (shove a slotted washer in, below the notch); allow the boost retard to continue to work; let the EZK continue to handle advance. Stack both the EZK and Turbo knock sensors on top of each other, using a long bolt.
EZK **MUST** get a signal from ECU to run right. On LH2.2 cars, you don't get this signal out of a Turbo ECU, so you **MUST** confirm that the LH2.4 Turbo ECU you'll be using does, in fact, provide this signal to your EZK. I have only read but have not confirmed that it does. If it does not, then you cannot use EZK at all and will have to wire in a Turbo ignition. (Without a load signal from the ECU, EZK throws a code and timing sticks at 14* BTDC).
Use the Turbo injectors but keep the NA fuel regulator, which is higher pressure.
Use a Turbo intake cam to drop trapped compression a bit (exh. cam is the same on both 16V T and NA engines).
Someone on saabrally.com recently did this conversion; might be worth your while to go to their forum and see what you can find.
posted by 65.102.159...
, Wed, 20 Apr 2011 18:15:50, Thu, 21 Apr 2011 11:55:13
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