924Board.org

doomer77 · Joined: 10 Jan 2006 Posts: 266 Location: Huskvarna, Sweden

me and a friend is having a disagreement, he says that it is entirerly possible to bolt on a supercharger or turbo on an engine without doing any mods to the engine and everything will work. I think that doing this will completetly kill the engine very quickly due to very excessive wear.

who of us is right?

(not only regarding 924 engines..)
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1980 924 n/a - engine swap begun
1989 Volvo 480ES

chris24 · Posted: Sun Feb 26, 2006 1:21 am Post subject:

Well, depends on how sound your engine is to start with. Will a 200,000 mile knackered engine stand it? Possibly not!

Look at what ESC944 is doing. Lots of interesting stuff in those 6 pages.

http://www.924board.org/viewtopic.php?t=15547&postdays=0&postorder=asc&start=0

(edit) Quoted from ESC944

Smoothie · Posted: Sun Feb 26, 2006 2:11 am Post subject:

You'd also want to provide some form of anti-detonation protection as in fuel enrichment and/or water injection, intercooling, timing retard...
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"..it's made in Germany. You know the Germans always make good stuff."

'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox

morghen · Joined: 21 Jan 2005 Posts: 9105 Location: Romania

It depends on WHAT engine...and in what condition the engine is.

the 924 NA engine can handle some boost.

NOTE: US cars have lower CR....we have 9.3:1 CR...
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Supercharger and EFI kits
https://www.the924.com

CBass · Joined: 03 Nov 2002 Posts: 2807 Location: Vancouver, Canada

Yes, it is very much dependent on the condition of the engine and the engine in particular.

Many engines can accept a bolt on supercharger kit, most kits come with everything you need including a chip that modifies the fuel and ignition to suit the new characteristics of a forced induction engine. GM makes one for Cavaliers and Sunfires with the Ecotec engine, I think they even install it under warranty but I'm not 100% on that. Comptech makes them, Jackson Racing, just to name a few people making bolt on blowers for 4 cylinders.

The 924 is not nearly so simple, the fuel and ignition systems must be recalibrated, or you'll be in trouble.

If you have an engine which has bad rings, fuel injection system in dodgy working order, carbon deposits and such, you're really rolling the dice trying to increase cylinder pressure with forced induction, or combustion force with nitrous or the like. If you don't get enough fuel, you'll run into detonation. Even if you don't experience detonation, you may burn your pistons or valves from combustion temperatures which are too hot. Carbon deposits can also stick valves causing backfires into the intake, as well as detonation.

Rigging up a forced induction system for an engine like the 924 is something best left to someone who is very knowledgeable and experienced in forced induction applications. Luckily we have a board member who is just that, ESC944. Read the thread Chris linked.

http://www.924board.org/viewtopic.php?t=15547&postdays=0&postorder=asc&start=0
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'81 931 in various states of assembly

J1NX3D · Joined: 06 Feb 2003 Posts: 1333 Location: New Zealand

I drove Andrew NZs 4spd euro n/a for about 2hrs out of a 5 hour trip back to Auckland after Targa NZ. The engine was incredibly tired and it was hard work.
I went for a quick ride in it last week now rebuilt with the bae, its a totally different animal. IT_IS_ SERIOUSLY_QUICK!! IMHO It would eat my stock turbo off the line! I cant wait till he works the bugs out of the system!
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'86 944