Does any one have any experience on supercahrging a 964 tiptronic ? I wish to pursue this option as my 964 is a real slugger 0-100km/h in 8.5 secs - that is even after spending US8K on a full engine overhaul just 6 months ago.

Great forum guys keep up the good work.

 

there must be something wrong with your car. The tip should do the 0 to 100 kmh in 7.0 or less. Have you checked your transmission oil level? You need a hammer (Bosch tool) to do that. Or have the car running for about 10 minutes and it should be at the lower level area of the check lense. Maybe you should change transmission oil and filter too.

 

Damian,

I have a SC 993 tip using TPCs kit. It has now done 12,000 miles and no problems to date. Low end torque changes the car characteristics completely.

Cheers, Mark.

 

I have just changed the transmission oil some 6 months previous so i do not think the problem lies there. I will re-check it once more.

Don't get me wrong but the car is great when it is rolling (that is provided you are sitting around 3800RPM in the right gear), but getting it off the line is where all the power just seems to get converted in to engine whirling noises.

For this reason I believe a more torquey low end is the way to go, hence a supercharger. I am limited to know how this set-up works - is there all round power gains and is throttle response improved ?

 

FWIW, I had the exact same problem with my 968 tip. It was like driving a truck off the line, but was great once the revs were up. I considered supercharging, but decided to get rid of it.

 

[quote]Originally posted by JonSeigel:
<strong>FWIW, I had the exact same problem with my 968 tip. It was like driving a truck off the line, but was great once the revs were up. I considered supercharging, but decided to get rid of it.</strong><hr></blockquote>

.....but does this explain the discrepancy between the "road-test" figures (John Miles excellent 964 site has a number of contempory tests) and damian6's 0-100kph figure. Shoot, my wifes mini-van ain't that far off that figure. I'm with Christian, first check out what you have and then build on a "sorted" base and something sounds off here. Thoughts everyone?

 

Dear damian6 - Tip Talk

I can't speak to the Supercharger issue, but on another thread folks are playing with a GTech and doing 0 - 60 mph runs. Two Tips have reported times at 6 to 6.5 Secs, and this is in line with old road test result. I ran a 4 run test on my '91 Cab Tip today using a GTech and averaged 6.21 - best was 6.0 worst 6.34. Even adding 1/2 sec to get fron 60 mph to 100 kph would not put you over 7 secs. I would agree with others here that you may have sometimg wrong. My Tip is all original with just under 40,000 miles on it.

By the way the best run for me was starting in the auto gate in 3rd gear (which forces a 1st gear start) with slight torgue load. How did you get your times?

 

damian,

check you second distributor belt and see if it is intact. my guess is it's broken. do you have a vent kit installed?

cheers,
boris

 

Boris,

Thanks for the advice to check the distributor, the belt was not broken but on checking the caps were absolutely shot - they looked like the dark side of the moon. I will replace them monday and hoping to get some better performance once again.

I would still like any feedback on the supercharger for the tip anyone got any advice.

Thanks <img src="graemlins/jumper.gif" border="0" alt="[jumper]" />

 

damian,

i'm not a big believer in supercharging.
the reasons are:
1. superchargers (like the eaton) eat up about 40hp.
2. without an intercooler they generate a lot of heat. this will wear your engine and also not produce a ton of hp. you really need an intercooler.
3. if you gain 80hp and eat up 40hp in the process that's an expensive mod.
4. in general i think the 3.6l motors beg for a twin turbo and i've seen turbo kits for as low as $7k new.

good luck let us know what you decide.

cheers,
boris

 

Ruairidh, you raise a legitimate question, one I struggled with. The car was definitely sorted, I had the best 944/968 place (Bauer) in the Bay Area look at it three times. The problem was that in automatic mode, the car starts from a stop in second gear. Bauer said that the they could adjust the ratios and do some other things, but that there would be weird side effects. So I sold it. Luckily, it was a relatively cheap first Porsche mistake.

 

Damian,

As Boris mentions, mine has a chargecooler and lower compression ratio to run 10-11lb boost. I get 310-320 at the wheels as a result, about 360-370 at the flywheel. A turbo with the same boost would give you more but the supercharger has immediate low end torque which suits my Tip perfectly.

Cheers, Mark.

 

Damian

something is wrong with your car. Either the torque converter isn't playing the game or you engine is seriously under achieving. In light of the fact that you have had a recent rebuild something is awry. I pulled a best of 5.97 sec with my tip.

Assume your engine rebuild was done well. There should be no "engine whirling noises". The torque converter should lock up to give 1:1 drive under heavy acceleration anyway. If its not, that's the first thing I would be checking - the torque converter. Under hard acceleration into second the car should respond to throttle really quickly - its like an on/off switch in mine.