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I am refreshing the head of my 968 and “while I’m in there” I want to get a bump in useable power. The car is 50/50 Street and Driver’s Ed track days.
Would you recommend slightly hotter cams or headers (Stahl, RS Barn etc) for bang for the buck? I will get a custom tune afterwards - thinking Behe in Maryland unless someone has a recommendation in New England.
I want the car to retain it’s factory drive ability and idle characteristics - just with a bump in useable power.
Contact Pete at RS Barn. Spoke to him yesterday and he is friendly and very knowledgeable about the progression of money to power in these cars. Depending on your budget clearly... Chip, headers/exhaust then maybe cams and better chip another day. Pete and Michael Mount have a tremendous amount of Cam knowledge on these cars. You can find Michael Mount on the Rennlist forum and he is generous with his knowledge.
Send those injectors out to a place like Witchhunter...while they are waiting on the bench for the head to show back up. For $100 or less they will clean, replace seals, and flow with a report of good health showing before and after readings.
968 injectors are pretty good but there is a more modern Volvo injector I've been running for a few years. I do not recommend spending money cleaning the older style when there is an updated alternative: https://rennlist.com/forums/924-931-...fferences.html
I spoke to Webcam and we’re looking for the specs for the stock 968 cams. Does anyone have them? Then they’ll be able to advise on lift and duration suitable for a street car, without worrying about valve / piston clearance issues.
I spoke to several of the vendors mentioned in this thread. I wanted to ask the board here: at what lift and duration do you start seeing degradation of idling or general street-ability of the 968 motor?
Cost can build up very quickly for limited returns. I had the following done about 9 years:
Stage 2 ported 968 head
Performance camshaft (& chain)
Lightweight Flywheel
Spring centred HD Clutch Plate
Stage 3 software
Custom enlarged throttle body
Above bought from Pete at RSBarn, knowledge and straightforward. He'll help you spend your $ (don't mean that in a bad way....just that he has a good selection of parts you can choose from, and the $/£ exchange was good back then)
When you start to factor in gaskets, water pump, consumables etc perhaps over $6k now, plus your labour. I also installed a 'Cargraphic' exhaust system with race cats, injector cleaning....more cost. Then live mapping, moving variocam timing, fuelling timing chages (at lift off) etc.
One then ends up with a car that is more track orientated - lightweight flywheel becomes irritating on the road, slightly cammy car, over responsive (flywheel and throttle body). But great fun on the circuit. Overall, car was orientated towards top end power/torque.
Friend of mine used the throttle body that Pete did back then, plus live mapped his car, airbox mod, exhaust i think. Some reasonable power/torque changes (maybe 15-18 bhp more) and great driveability. If i was to repeat, this is the way i would go.
My car ended up very modified; rose jointed/solid bushing throughout, Bilstein Cup suspension + plus lots more tweeks, and TBH became a pain to drive far on the road. Really came alive on the track though.
Incidentally, it was used for hill climbing/sprints post me selling - and quite competitive at that. Couple more sale/buys and is currently up for sale again. I do wonder whether they know what they really have...its Carrara white BTW, not Grand Prix ...i had the car bare metal repainted in the brighter white.
what i really want is supercar performance out of this supercar chassis and body."
I agree that is what you want. The car will keep thirsting for more power until it has what it needs.
& the only way to get supercar performance is to go turbo (ask Raj how much) or V8 ($25~55k to do something properly).....
Face reality; There's not a beans worth of mods left in this motor worth doing besides going to an acceptable sounding straight pipe setup with resonators and a big *** magnaflow out the back.
accept the 968 for what it is. a wonderful front engine Porsche kit car platform to begin your project;
Call Renegade Hybrids or one of the Turbo builders and get out your checkbook.
the other crap will just foul up a perfectly fine sporty engine....
what i really want is supercar performance out of this supercar chassis and body."
I agree that is what you want. The car will keep thirsting for more power until it has what it needs.
& the only way to get supercar performance is to go turbo (ask Raj how much) or V8 ($25~55k to do something properly).....
Face reality; There's not a beans worth of mods left in this motor worth doing besides going to an acceptable sounding straight pipe setup with resonators and a big *** magnaflow out the back.
accept the 968 for what it is. a wonderful front engine Porsche kit car platform to begin your project;
Call Renegade Hybrids or one of the Turbo builders and get out your checkbook.
the other crap will just foul up a perfectly fine sporty engine....
LOLZ, you have literally never set foot onto a road race track facility right....?
09-10-2018, 09:23 PM
968: get cams or headers?
...i had the car bare metal repainted in the brighter white.
