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Re: Saab 99 EMS Turbocharging Options...repost Posted by Justin VanAbrahams [Email]  (#32) [Profile/Gallery]
(more from Justin VanAbrahams) on Wed, 14 Aug 2002 15:13:22
In Reply to: Re: Saab 99 EMS Turbocharging Options...repost, jason, Wed, 14 Aug 2002 13:10:44 Members do not see ads below this line. - Help Keep This Site Online - Signup |
The early turbos ('78-'84 here in the States) all used Bosch K-Jetronic - it's CIS, fairly primitive, but good enough for Porsche, so.... :) Although modulated electronically for emissions contriol, it's primarily a mechanical system. Incoming Air acts on a lever and as the lever deflects more fuel is allowed to the injectors. It's pretty simple. It's main issues are that the lever is a major restriction in the air path and it has a lot of parts to make it work. The upsides are that you can ultimately wring as much power as you want from it... IIRC Porsche 928s used Bosch CIS, and they made over 300 (in Euro-spec trim). There are a ton of variables to look into, but no more so than dealing with aftermarket injection. You just need to find the right-sized fuel distributor and the right sized injectors, but a Bosch shop should be able to help you out with that. Some have reported good luck stealing those components from unsuspecting Volvo 700-series GLEs (with the PRV V6). If your car doesn't have to meet emissions, well then, I honestly wouldn't give it a second thought - for the $50 or less it'll cost to get the beast running with these components, it's a worthy experiment. You'll actually be able to run quite well by swapping the injectors & distributor from a Turbo into the rest of the EMS's stock injection.
The *only* thing I can imagine that will give you trouble is that the fuel distributor/air cleaner sits exactly where a 900-style intercooler would go. That's not a problem if you follow Gregg Cronn's lead, and install a 9-3 Viggen intercooler. I'd absolutely look into that - his install is *slick*.
On the ignition, the CIS obviously does not handle any of that. On early, early cars (like the EMS), ignition is handled by a simple magnetic pickup in the distribur and a "computer" on the fender. It's exceptionally simple, and does not allow for a knock sensor input. You can easily upgrade to the later ('81+) Hall-Effect ignition which is more accurate and more reliable. It doesn't have knock-sensor capability either. The only Saab/Bosch system that has knock sensor input to the ignition is EZK, which was equipped on 16v non-turbos - unless you get into the 1990's equipment, what with DI/APC and Trionic and all. But I suspect you aren't going there... :)
Um, the knock control in Saab Turbos is handled by APC - a completely separate, analog control unit. The only thing it does is adjust boost pressure by means of a solenoid acting on the wastegate control. Very simple, and operates by and large exactly how modern computerized boost controllers do, save in additional to limiting boost it also modifies it based on knock...
As for parts, try your local junkyard. There are thousands and thousands of dead B201 Turbo cars out here. Let people know where about you are, and I'm sure some will have a recommendation for a local source.
-Justin
posted by 64.166.4...
, Wed, 14 Aug 2002 00:15:41, Tue, 13 Aug 2002 20:30:50, Wed, 14 Aug 2002 15:13:22 <-- Viewing This Message
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