rsnissan

Hi I am looking into 911 ownership, I currently have an 86 Sierra Cosworth pushing 450 BHP RWD. I figured the 964 turbo was a natural progression - old school lag rwd and not sutble whale tale (all similar traits of the Sierra!)

I have searched the forums and know all about the price differences between the two, rear bumper, Big Reds, 18" speedlines etc etc.

My question lies with the tuning potential of the two, I am a keen DIY'er and would rather pay more for a solid base I could modify further.

So my questions are

does the 3.6 offer more tuning potential over the 3.3?

does the 3.6 have EFI already (I hear this is required over certain levels)

Is the M64 in the 964 the same as the 993 ?

also are than any other differences that would be relevant that I may have missed, suspension, part compatibility between the two etc

Thanks Andy

schnele

No EFI until the 993, the 3.3's case is stronger than the 3.6 so the argument could be made that if you are modding it extensively the 3.3 is as good, swap for a 3.6 crank from the RSA or 3.6 turbo and you have yourself a stroker. My suggestion is to buy the 3.6 and leave it alone.

JBH

I'll give you my opinions:
Just abount anything you can do to a 3.3 you can do to the 3.6 and vice-versa. If you modify a 3.6 engine you will likely lose some of the price differential. The 3.6 is most highly valued unmodified

The 3.6 does not have EFI. If you want to make much more than 400 at the wheels, you need to be able to supply more fuel to the engine and keep the air/fuel ratio fairly constant over the entire rpm range. EFI is good at that. If you are looking for higher HP than 450, then you are on a slippery slope. You are looking at engine mods to support the additional HP and heat generated. It can be a great project, but you will need some advice along the way from those that have done this before.

I think the engine in the 964 is different than the 993, but I am no expert in that area

For a DIY, I think you would be better served working with the 91-92 cars - they are less expensive and you can get plenty of power out of the 3.3L engine. It's basically the engine that evolved over many years of the 930.

Ag02M5

I hadn't heard of anyone doing this mod. I'll have to research. What else goes into the conversion?

rsnissan

Thanks for the input guys, so basicly the 3.3 is the one if I want to take the power up (as the rarer 3.6 should be left alone) 450 BHP is as far as you could take it without going too far? is that stock internals, maybe (excluding headwork) ?

Thanks

Megatron-UK

If you're in the UK (I presume you are), then your biggest problem is actually finding a 3.6, the second problem is finding someone wanting to sell.

The figures vary, but no more than 80 of the 1993-1994 3.6 Turbo models were produced for the UK market. Compare that with a couple hundred of the 1991-1992 3.3's.

BTW, both of the cars get horrendous mpg figures - no ecu, and they use what is basically the same as the early XR3i injection system - expect to get no more than 16-18mpg on average. Very expensive with the current £1.15/litre ($2.00/litre) price of regular unleaded....

rsnissan

Cheers, Yes I am in the UK. I have seen a couple of the 3.6's on Pistonheads. The MPG wont really be a problem I am used to worse figures on my current car (less when on track!) when driving it as intended. This will just be a sunday driver to replace my current car.

cobalt

I agree with the others modify a 3.3. Lower initial investment and your going to need to modify the internals anyhow on either.

Regarding the 3.6 case it is the same case used on the 993TT/996TT and IIRC the 996GT3. Just set up with slightly different internals. Strength is not an issue on either. Some people have modified 94 turbo cases to produce 1200 hp.

SA Mike

+1

jim dorociak

yes, Ryan you can use the 3.6 crank 76.4 instead of your 74.4 and get the bump up to 3.5 to go the rest of the way you need the 100mm p/c's. the 3.3 is a 97mm p/c with a 74.4 crank going to 98mm cylinders/psitons gets you to 3.4 going with 100 mm p/c gets to 3.5 and changing the crank with the 100mm gets to 3.6 and the 102 goes to 3.8 - Jim

rsnissan

Thanks all very much for the information

graeme36s

Going the moding route the 3.3 is the better way to go. Left standard and from a potential investment the 3.6 is the one but you know that anyway. my 964 3.6 had a few minor mods but was never that bad on juice. low 20's were the norm. I think the worst I saw was 15mpg in France a good few years back but we where travelling very quickly. Alencon to Calais with a half hour stop in 3 and a half hours and that was on the old road.
Enjoy your search the 964 turbo's are very special cars. Just be very careful on the moding as so many guys have got them selves into some major headaches.