924Board.org

[Dave]

Would I notice a difference if I send my throttle body out to be enlarged 3mm larger than stock??? I think It would help with my other upgrades

[AznDrgn]

Why not just get one of those audi ones?

[924 turbo]

I think he has a 924S.

As for the throttle body, you probably won't notice much of a difference. I would suspect somewhere in the 0.5-1.0hp at 6500 rpm range

[AppleBit]

The guys in Stutgart know what they are doing...

If you raise the compression a hole heck-of-a-lot

then you might get up to a max of 5 hp...

Most 2.0 liter guys upgrade their throttle thinking they will get 1345 hp increase... you don't but it can change your horsepower/torque curve...

_________________
Classic British Sports Car Restoration v6 + v8 Engine Conversion Swaps

Porsche 924 Wide Body LS1 Corvette 500 Horsepower Engine

[Rick MacLaren]

My horsepower increase with the Audi throttle body was only like 120 HP. Not quite as much as my K&N filter, which clearly put my 924 into 'supercar' territory...

[MAS]

"The guys in Stutgart know what they are doing... If you raise the compression a hole heck-of-a-lot then you might get up to a max of 5 hp..."

If you are referring to the 924S (which is the car Dave owns), I disagree. The European 2.5 liter engines in the (pre '89 8 valve) 944 had a compression ration of 10.6:1 and produced 163 hp. Whereas the North American cars had a lower compression ratio of 9.7:1 and produced about 147-150 hp.

The case of the 924S is a little more complicated, since Porsche had to de-tune the European cars down to the US 944 horsepower rating by lowering the compression ratios of the 86 and 87 924S's. The reason for this was the 924S with the full 163 hp was a noticably faster car than the more expensive non-turbo 944... and as it turned out, the detuned 924S was still slightly faster, anyway.

So if an 87 924S has 147 hp with the stock 9.7:1 compression ratio, it should give at least 160 hp, or more if the engine could be "restored" or converted to the higher 10.6:1 European compression ratio.

Not being a mechanic, I've no idea what is needed to convert a US engine to a Euro spec engine (ignoring the EPA concerns). However, it seems to me that this would be a good way of gaining (or "restoring") 16 "stock" horsepower.

-MAS

[Beach]

Does anyone know how to get a 924S up to 163hp? I'd love to try it on my car.

[larso]

the guys in stuttgart DO know what they are doing applebit....BUT, not when they are restricted with EMMISIONS LAWS.

THere is a donut in the 924 NA engines throttle body, stuttgart did not put that in there because they know what they are doing they did it for emmisions.
The 924 and 944 camshaft are emmissions friendly.

[Beach]

[Dave]

To get 10.3 to 1 compression you can Shave the head down and raise the compression or you can find the pistons they use in the Euro cars. I think there are to different types. One is a Mahl (or something like that) and Im not sure what the other one is. But if you look at the 2 there is a difference in the pistons. Also If you are looking to get 163 HP or so check out the MAF kit on http://www.HuntleyRacing.com Or you could get head work and exhaust and all kinds of stuff to boost the HP on a 87 924S you just have to look in the right spot

[larso]

u can shave the block to a certain extent...if the flow in the head is good without shave (better) than shaving the block is an advantage, but u can only go so far so that yer pistons don't come above it as u know.

[Dave]

Ya you cant shave to far or say good bye to your valves. Is there any way to advance timming in a 924S or is it computer controled?? If it can be adjusted how many degrees should I go???

[larso]

advancing the ignition timing?????

u mean the valve timing? and adjustable cam gear or u could go as far as skipping a notch on the timing belt if you really needed it that much.
Remember it won't help up your HP, it will move it around to your RPM u want.

[Joes924]

On the thread I had to get a bigbore you can bore yours .. its great its not for everyone though.Heres to the 1979 924.



[ This Message was edited by: Joes924 on 2002-05-26 18:48 ]