Hi al iam new here and need some help my car is 993 targa 1996 variocam
the problem is the performance is weak especially at low rpm you feel its slow there is no tourqe ,when i floor it from zero on it change to second gear at 5000 rpm wich is not right it should change at 6200 as ive seen in othe cars , when you drive the car you feel its restricted as if someone is holding it or performing brakes . i serviced the car at the dealer and they say its ok but i didnt think so , so i took it for a dyno test and the result was as i expected 215 whp !! what should i check or change to fix the problem (gear oil, diferential oil never been changed before car has 70000 miles now). the mechanic performed a compression test the result was 140psi for all cylinders .also timming is correct , car starts easy idles ok no smoke no leaks at all.any input would be appreciated .
here is a list the parts that i changed recently:
1-fuel filter
2-spark plugs
3-air flow sensor
4-cleaned all inectors
5-fan
6-harness
7-ignition coil
8-sender
9-fuel pump
10-air filter

 

Original clutch? maybe the clutch is starting to slip.

 

forgot to mention my car has tiptronic auto ...( does it has a clutch ? )

 

Check the vacuum splitter (993 110 573 00). It can collapse and restrict the vacuum to the Varioram (your car does not have variocam).

 

215whp is right around where it should be.

I'll second the varioram vacuum, check the whole system, I bet it's not working properly.

 

thanks for the help guys,,today i will change the vacuum spliter and hope it will solve the problem i also changed the gear box oil and filter . i will update you tomorow.

stealth 993 : what should i check the system for is there is any settings ? or things to look for as the specialists here doesnt know alot about it even the dealership garage ,,so if you could please point things that i shoud set or check. thx appreciate all your help

 

I got the car back today after changing the gear oil and filter and vacuum spliter ,, the car runs much better alot of low end tourqe very smooth through the rpm and the gear changes are nice and it revs at 1st gear to 6200 rpm .. thought why not check the gain and take it for a dyno run .. for my surprise the results came the same 215whp is that real any possibility the dyno is wrong as the car runs very fast ?
I thought i would thank you guys as the car is much better now but is there is anything more i could check ?

 

LOL, Varioram is really for low-midrang & part throttle, when you got WOT, it just opens the system up, so you would only see a change if the system was not opening up under WOT @ high RPM's.

Varioram really feel it @ part throttle in the midrange.

Other then possibility a tune up, your fine. My C4S did 215whp also.

 

thanks alot that was comforting i was feeling bad cuz i thought it should have more whp .. some guys say there cars have 260 whp .. so now i feel much better and well be enjoying the car more
I'll start a new thread about the targa top .

 

Dyno are all different. Some read low & some read high. My C4S on a Mustang Dyno did 216, my C4 on a Dynopac in 20deg weather did 235hp. The C4S is faster on the road.

The only real thing is to see what other 993's do on that Dyno.

 

I ll try to ask the guy at the dyno shop if he has some data for other 993

 

Our cars only have 285hp (which was good in the mid-90's) so those with a 260 dyno reading are a little optimistic....

 

What type of dyno is it? We typically see around 250 rwhp on a Dynojet or Mustang - a Tip will be less.

That said, typical causes of low power on the 3.6 motors are as follows:
a) verify that you are achieving full throttle body opening when you have someone press down on the gas pedal.
b) verify that both sides of your ignition are firing properly. disconnect one coil at the power terminal at a time, then start and note how it idles and revs. reconnect and repeat on other side - if you notice a difference you have a ignition fault
c) verify operation of the resonance valve - a non functioning valve will cause a 30 hp loss at the top end, along with a sharp rolloff of power above 5500 rpm

 

Its dynojet and my car is tiptronic, ill check a and b and c thanks alot .
will fuel type affect the performance ? ill change the fuel next time i refill it might take 2 weeks cuz my car has a very big weird tank i will refill it with 98 RON , i was using euro IV ..and i think its rated at 95 RON

 

If it's chipped, going with 98 RON might make a difference over 95, depending on the programming. With the stock chip, it won't make much of a difference as it's so detuned to leave a big margin for a car that is poorly maintained and using poor fuel.

I forgot to mention that when we see 250-255 rwhp from a 993, that is after we chip the car. With the stock chip expect about 16-18 hp less.