Paseb

Did a 10 minutes ride yesterday with the gf.
Her first time in my car.

Car stalled 4 times at lights/stop signs. Grrr

I have steve wong chip in the car.

Car is a 1995.

Is there a certain time for the car to accommodate the chip and flywheel?

Thx for the help

nine9six

Seb,
When you bought the chip, did you tell Steve it was for a 1995 993, with a lightweight flywheel?
If so...
The ECU should quickly learn the new idle and air flow requirements of the lightweight flywheel and adjust the idle accordingly.

Paseb

Yes i did

How quickly? Few hundred miles or 10mins ride?

P-daddy

Hmm that is odd. I’ve had a 964 and a 95 993 with LWF and Wong chip. No stalling at all. Try waiting for rpm to drop a little lower before you disengage clutch.

mhm993

Clean the ISV.
Then learn to be a wee bit slower with the left pedal.

WRXdriver

I have a 1995 with Steve Wong chip and lwf. If I drive it like a normal car it will die < 5% of the time I allow RPM to drop unassisted from any sort of normal driving speed. That was disconcerting at first, but now I just blip the throttle as RPM drops and never have an issue. Is yours dying once established at idle, or only when the RPM drops quickly toward idle? Mine only ever stalls due to rapid RPM reduction, but never once established at any steady state RPM.

JPS

ISV
Some behavior change
Adjust position of ISV if that doesn't work.
P-car.com has the ISV info.

jakeg

You might have already done this- Did you disconnect the battery at any point? If so, did you 'readapt' the car after the battery was reconnected? Simple to do-

1. Disconnect Battery for about 10-30 mins.
2. Connect battery back.
3. Start car without touching the throttle pedal.
4. Let idle for a few minutes.
5. ​​​​​​​Take it for a drive.

Meenrod

Did you double check with Steve that he accounted for the LWFW? I know you said you ordered that but he may have omitted it when burning the chip by error.

Coleman

I have the same set up, Steve W chip programmed for the LWF- it will always stall sometimes; the key is knowing when it will. When you come off the gas for a stop sign, you'll get into the habit of blipping the throttle just a bit- and with proper blipping & learning it will never stall.. Basically, if you're going to let the RPM naturally fall down to its idle, on that dissent right around~1k, just give it a little jab, if you're breaking to a stop sign, then you'll need to heel and toe to blip..

pp000830

​​​​​​​​​​​​​​OK, so folks with this mod above are saying the engine will stall from time to time during normal operation when the clutch is engaged and the engine drops to idle. I would not call that a feature. I would call it a bug, a big enough one to call into question the conversion of the flywheel until Steve Wong or whoever supplies the software sorts this issue out.
It is just plain silliness that somehow the owner of the car has to adapt or compensate in their shifting procedure to adapt to this bad running issue.
If I had this experience I would be mad as hell and go back to the vender who is responsible for sorting this out or paying for the conversion back to the stock flywheel.
​​​​​​​Andy

JPS

It's long documented. The onboard computer on the 95 can't catch the sudden drop in revs due to the decreased time to get on low revs with the LWFW.

Steve Wong and Steve Weiner have or at least had chips. It isn't a chip thing. They make it better, but not perfect. Cleaning the ISV makes a night and day difference for some. But it isn't a chip bug, it is a 95 993 bug the chips help yo fix.

Coleman

If you're really concerned with it not stalling, you're probably better off with a stock dual mass flywheel...

pp000830

By definition, the OE programming, controller, sensor hardware and Dual Mass Flywheel work perfectly together when used as the OE manufacturer tested and specified. When an aftermarket flywheel and or flywheel & control software is installed one has an unresolved operating issue.
Since the original OE solution works perfectly and the aftermarket modification does not it is a matter of the aftermarket modification(s) not being compatible or not properly engineered for use with the 1995 model year car. The idea that somehow the1995 993 has a bug because an after-market conversion sold for use on it doen't work properly just doesn't pass the sniff test as a reasonable view of the situation.
Andy

Railmaster.

+1! There is a good reason Porsche build the cars the way they do!

If a few simple mods could release a lot of extra horses without any problems, believe me, Porsche would have built the cars that way!