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Hi Ian!
Posted by Jeff Cullen (more from Jeff Cullen) on Sat, 15 Oct 2011 23:11:26

In Reply to: Re: Paging 900 Aero- Group9 AID, Ian Scott, Fri, 14 Oct 2011 09:27:04
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The AID is my single most favourite thing I've done to any C900. I am actually not running the RRFPR at this point, and have a simple 3bar, but I do have a Jak Stoll chip and T5 injectors.

My favourite change was, without a doubt, the AID. I get to run exclusively 94 octane fuel up here in Vancouver BC, so I can set my basic timing to 20BTDC and never hear a trace of knock even in summer. Hooked an air compressor up to the AID and set it to 20PSI, adjusted the stop so it was running 10BTDC, and it's absolutely awesome. It's a stump-puller off boost, super fun around town... and the boost comes on much more smoothly and usefully than stock. I don't see the needle fly as far into the red and then come back, rather it smoothly goes a bit into the red and just sits there until I shift just before the rev limiter. The way the boost comes in is just so different... my buddy's '87 turbo 'vert is just so much more violent as the boost kicks in. I never liked that, as my first turbo car was a 9000 Aero which is so much smoother and tractable. Anyway, the SPG is now psychotically fast, bearing in mind the '85 SPG has the same-as-8v-non-turbo ride height and solid front brake discs... but mostly I enjoy how tractable and smooth the engine is down low, how little I have to lay into it to get going, the fuel economy, and the fact I can easily smoke left lane hogs when required. Serious restraint or Valentine 1/similar highly recommended as holding 90mph becomes a cakewalk--seems most happy around there, roughly 3500rpm, throttle just a bit open...

I am lucky enough to have access to the Saab "Pulserelations Meter" which makes dialing in the AMM a snap, but I believe you can use a dwell meter as well... Dave will have to chime in there, but his guesstimation at roughly 200 sounds right to me.

Good luck and have fun!

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