V2Rocket

i wonder why they would introduce the new MY for 88 with less power for ROW lol

M758

Why? The made the the car the same for USA and Euro regs. One car for all markets. Also fuel and emissions regs were changing in Europe driving this change. Also all 944's (and most Porsches) from the 86 Turbo were rated the same hp in USA and Europe.

V2Rocket

ohh i forgot about the revamped emissions stuff for euroworld

V2Rocket

so if i wanted to drop my CR to 9:1 from 9.5 how much more material should be taken from the bowl

MAGK944

In 1987 they also announced the removal of 4-star (98 RON) gas from most European gas stations with effect Jan 2000. I guess this might have contributed to Porsche lowering the compressions on the later 944's.

Giantviper

M758: From what you said the Euro rating of 163 was without a Cat for the early cars but on the 1988s the Euro and US cars had the same HP. Did the Euro Cars have Cats in 1988? If so how much HP would I stand to gain with a test pipe (or bypass)? or would the amount be not enough to be worth getting the bypass pipe?

MAGK944

I think you are wrong Spencer. The S2 rods are dimensionally the same as the 2.5L, it's just that they attach to the pistons at different locations to make up for the different stroke. So if you want to build a 2.8L stroker from your 2.5L, you just need the S2 crank and custom pistons. I think Andial makes the correct size piston for the turbo 2.8L, you would just have to have them make a set up with a higher compression.

Here's an old post I found in search about the S2/2.5L rod dimensions:

M758

Test pipe is something I advise for all 944 spec cars. To me it the only thing that picks up hp at least on the track. How much of a gain. 5-10 hp depending on the condition of the current cat. You may need to tune the AFM however since the car can run a bit lean with no cat.

I don't believe it worth it for a street car.

V2Rocket

oh thats interesting. i forgot that they could move the pin lol

ndrk

As i can recall CAT was standard from ´87 in EU 944´s

924S was a bit weaker the same reason Camaro is always weaker than Corvette, although they were sharing the same engine - marketing

Darwantae951

Euro N/A piston:

MAGK944

Looks like they could have made those Euro pistons a flat top and kept the same compression by using deeper cut-outs for the valves, maybe even clearing the interference issues.

Darwantae951

There have been attempts to make non-interference pistons for our cars but most found out that due to crown thickness with deeper cutouts, it wasn't a very good idea. Don't know if Porsche thought of the same thing or not.