H964

well i wish i never seen this, now iam starting to realize thats the way to go .. the owner claims 400hp (91C2), thats got to be nice.
for some reason the engine looks a smaller.

bhensarl

Is that a TPC unit?
Brian

H964

MARC A. 964 C4, i have seen your engine iand it looks fantastic, and i do undestand your response, but sometimes i wish i had another 150hp to play with.
by the way thats a supercharger and it looks like they did a great job

Geoffrey

I've had the opportunity to work with the TPC superchargers and MoTeC on a stock C2 engine. They will deliver in the range of 305-320hp to the rear wheels with either Motronic or MoTeC, so it is more in the range of 350-375.

Red rooster

I had, years ago , involvement with a supercharged 964 C4 that had lowered compression , intercooler, injectors etc.That car made a real,easy 400 bhp with matching torque everywhere . Bloody fast , in fact a bit too much for the street with no lag to tame the response . The C4 bit was essential for the wet.

The standard compression limits the boost that can be run up to 4000 rpm so with a linear supercharger ( Eaton etc ) there is a definite cap to boost ( 4-5 lbs ? ) and so to bhp ( 330-340 ? )
A square law compressor ,( Vortech/Rotrex etc ) can be geared to run small-safe boost up to 4000 and because of the square law will give more boost as the rpm rises into the safer area. This gives a rising straight line torque/bhp curve ,so sub 4000 the motor is a bit over stock but at 6000rpm big numbers !!
Definetely would be my favourite choice with a stock motor.
No affiliation with any supercharger maker / tuner etc etc. just my $0.02 !!

All the best

Geoff

Bates

My pal and I used to take his Dad's '89 C4 to proms and homecoming (with our dates squeezed in the rear). It was stock and fast. He then put a turbo on it that got him to just about 400HP with not even room for a ham sandwich in the engine compartment. The car became an absolute rocket - very, very fast.

Since then he has rebuilt his motor ($15,000 @ 80,000 miles) and I just saw his car, at the shop he introduced me to, with the engine out again...finally fixing an oil leak from a bearing.

Fast is fun. Crazy fast is crazy fun and crazy $$$$.

Greg_L

i'd like 400hp at the rear wheels. I'd like that a lot.

Marc Shaw

That does look like a TPC unit (see here).

Geoffrey - based on your experience with them are they reliable? I am interested in one down the road (and I think Rick [Smokin] is too) so I'd be curious to know what you thought of them.

Marc

kris

Hey Marc, is the end of the slope in sight yet. It seems you keep on accelerating downhill

Geoffrey

Personally, I think that there are a lot of compromises made to run them in the Porsche. The bottom line is that they do work and do last, there are a number of engines out there are used in DE or track environments that run fine. The TPC kit is well manufactured and it works well as a package. The thing that I don't like is that the 7th injector is required to keep intake air temps under control, moreso than to fuel the engine. Without the 7th injector, the intake air temps, even with an intercooler are well over 170 degrees F which is approaching the preignition limit of these engines. Without an intercooler, they run as high as 230 degrees F and will preignite.

Without the 7th injector, even with an intercooler, 9:1 compression, and 6psi of boost, I was not able to keep the intake air temps under control with the MoTeC. It needs the fuel in the manifold to cool the charge air temp. I don't like that strategy. It did make 360 to the wheels though.

Red rooster

Geoffrey,
Your experience with the Eaton blower matches mine. It doesnt seem a very efficient blower , hence the temperature numbers.Poor old motor.
A 7th injector at 4/5 lbs boost is not a good way to ensure equal mixture distribution .I thought that was a carry over from a scheme to keep 993s OBDII compliant not a way to cool intake charge !
I believe there may be issues with the rotor coating as well.A look at the experiences of Ford,GM, Mercedes owners may be useful.
Geoff

H964

well i wonder how much it will cost to have a system like that installed(parts and labor) by a good shop.
if i didnt know better i would thought that engine is stock, it just fits great and cancels (or cover) or the little plugs and wires.

Chris M.

Kris said:
The what?

c

9-kevin-11

I think one of the great things about Porsche is that they produce "balanced" cars... They don't just add power to a car *****-nilly... They look at the car as a complete package - if they want one with more power, then they give it a suspension and wheels and brakes to match. Its nice to have a company that designs vehicles from a holistic point.

Marc Shaw

Thanks for the input too, Geoff - I did not realize you had experience with them too and value your advice based on your background.

Marc