Brideyo

Still contemplating this whilst engine out. Would you/wouldn't you? Downsides/upsides/
Tks

STUARTQ

Not that I know much about the pro's and cons of this, but I'd imagine the only real down side is cost, may be fuel consumption.
If the car is very original, and in great shape, it might pay to keep it original, otherwise, I can't see any other reason for not doing it.

FeralComprehension

Have you searched? I know there has been one or two good threads on the subject, and IIRC someone who should know (9m or Steve Weiner) said basically, "You can't just slap a 3.8 conversion in there and get all the performance you paid for." Probably the next line was to suggest that an aftermarket ecu was called for....

boxsey911

I think it would be the start of a very slippery slope that could lead to yet more future upgrades and expense. Keep it standard. They're great engines when freshly rebuilt. Spend the extra money on suspension (which you've already mentioned it needs).

STUARTQ

Ref Feral and Boxsey,

I would imagine a 3.8 as you say is the start of a slippery slope, hence the cost issues, you should expect to pay possible double the price or more than you would with a straight forward rebuild.

I think Jackpe rebuild was with Cup cams and left at 3.6 and it sounds like he has had great results.

I was quoted approx. £13k in Switzerland for a similar rebuild by a well know specialist using different cams etc, he reckoned on 320 ish BHP from that set up.

If your funds are unlimited, then there is a lot that can be done!

cobalt

If money is an issue don't do it. the gain is nice but cost escalates quickly. If you want more power a low boost turbo would give you more torque and about the same HP for far less. The engines can handle it for street and I have seen track cars survive without issue. No signs of lag and it pulls like a freight train.

ras62

If the existing pistons/barrels are ok then its not worth doing imo, but if they need replacing the conversion could make sense. Another option is to use higher compression pistons using the existing barrels, this can give better results than a 3.8 conversion.

Brideyo

Ok lots to consider there. Part of me also thinks leave standard and go wild with suspension instead but it's the fact the engine is out is now making me think . Don't have to make a decision yet I'm guessing it'll add circa 4/5k to the build

STUARTQ

I've recently seen a supercharger installation using the Rotrax unit, very neat, goes where the A/C compressor would normally go, so if you have a non AC car its very neat, compared to the TPC system and a cost effective gain in HP too.
Apparently, it does alter the character of the flat 6 though.

Smokey7766

I highly recommend it!!

orp73

deep down we all know a 3.8 is the way to go, so why the need to ask?

Paul284pt

Yes, yes, yes....




Paul

Brideyo

If it means it's a constant route to modifications maybe not really being that way inclined I'll take Boxseys advice and leave as is.
It has aircon which is being overhauled now so maybe no space for supercharger as was suggested.
Cars low miles maybe it's not the one to modify too much bar suspension for the sake of 50hp.
Tks for viewpoints

STUARTQ

Why not talk to someone like Redtek.
Nick is known and trusted now amongst our group if you like, there are several owners whose 964's have been in his hands and ask him for suggestions and likely cost. That information will allow you to follow the best route that suites your needs and pocket.
Paul, Frank, Jack and now Alex have or are in the process of having work done by Redtek.

Paul284pt

Hi Brideyo,

A 3.8 isn't necessarily a constant route to modification but it will mean quite a lot of expense for parts and with a Motec ECU, or similar and possibly ITB's and maxflo exhaust but it's worth doing them all at the same time. It will look, sound and drive great but do you need it or really want it (I'm afraid I did ha!).

A really good option with a lot less expense is a Cup engine, a performance engine retaining the 3.6 but a build with cup cams etc. I'm sure Jack could give you some good feedback.

Stuart is right, talk to someone like Nick who will give you good impartial advice and listen to your needs/desires. I spoke to him a year before I went ahead with my build and there was no pressure to spend, in fact it was quite the opposite.

Good luck,
Paul