twisted

This is a very interesting problem we all face who have cars with Egas and not being able to left foot brake the car under both gas and brake applications. See link below.

Porsche has designed the GT3 for the track and without being able to left foot brake the car one can NOT check his brakes while under gas nor pump them up if one needs to during a very long track session not to mention some corners only require a left foot brake application before turn in.

I have confirmed it that my car will not left foot brake and take gas at the same time.

So does anyone know of a third party software company that can reprogram, turn off the gas shut off in the DME.

Because you can not left foot brake an Egas car like the GT3 hear in the US and the problems with the PCCB makes me strongly think of putting my GT3 up for sale. If you can not left foot brake a car that is designed for the track by Porsche then they have missed it. One needs to be able to check his brakes on the the track.

http://www.renntech.org/forums/index...st=0#entry2620

TrackJunke

Does this also mean you can not heel and toe? I have driven an 01 996 with no problems blipping the throttle while braking.

1AS

No, you can still blip and brake. It appears that depressing the clutch inactivates the "no brake and throttle simultaneously" rule. I particularly liked brake and throttle for snow driving in my 91C4 as it allowed exit oversteer, but the current need to depress the clutch eliminates the technique. AS

Karl S

I haven't tried this but someone else posted that if you come off the throttle and apply the brake, you can then get back on the throttle while continuing to brake. This is why you can do a throttle blip when heel toeing. However, it doesn't do much good for the track, because you lose momentum once you release the throttle and the damage is done.

Karl

Mr. RS

Think this must be a US thing as my UK model did not have this problem.

Either that or I was doing something wrong!

Is it something to do with your emission regs?

P.

twisted

Correct US only, EPA issue! Which makes the GT3 for use on the tracks here in the US not much fun if you use left foot brake. Porsche really needs to step up and offer a solution!

Mr. RS

I know this sounds simplistic but can one of the Euro specialists help with reprogramming your ECU?

If you are taking the car off the road for the winter this might be a solution.

Mind you saying that I am sure that you have guys in the US that could do the same thing if they had the correct peramiters for a Euro spec car.

P.

JeffES

If I may -
don't blame Porsche for this one - (yes, they can go FUBAR from time to time). This is an EPA issue. Do some searches on the EPA's website, and you'll see some really mind blowing specs/standards/regs. For example - my brother in law's Corvette (no "egas") has a part throttle or brake induced gear lockout! That's right - under certain part throttle or during some brake applications, you could try to shift all you want - and it won't let you! Talk about frightning & unnerving!
Anyway - as a registered importer & distributor, PCNA is legally bound NOT to curcumvent the regs, annoying as they are.
J
PS - the gear lockout device is how many non egas cars are controlled in brake/and or/part throttle applications.

Sloth

I just got back from taking my GT out. I have yet to notice this issue of the throttle not responding when on the brakes. In fact, I was standing on the brake pedal and reving the engine just fine and before that I was drying my brakes by holding the brake pedal while staying on the gas. Perhaps there is a programming error on my car or on your car. 7/03 build.

Regards...

twisted

Try it the other way around, keep you foot on the gas and try to continually apply the brake. Say your at 60mph, keep the gas at the same position, start applying the brake some, then see if it will take any gas while you are applying the brake.

Sloth

I did that when I was drying my brakes, although I was only going about 25mph. I was holding the throttle and applying the brakes... no issues. I will give it a try again when I take her out next, but I have yet to notice anything... which sounds like a good thing.

Marco Polo

I just got back from a "test drive" with my GT3 (#067, Mar. '03). It will not accelerate against the brakes.

I held 60 mph (in 3rd and in 4th), and applied the brakes. Road speed and engine speed dropped; no amount of throttle would keep either up.

9caregiver

Greetings,

Am I missing something? It is obvious the cars may be programmed this way. Wouldn't it be easy to switch the dme for a European version?

Best,

Don

twisted

fwiw,

I called a few days ago my offshore software engine tuner that I used on my race car who also does RUF stuff and he has put a call into his sources. What he has heard so far is on some of the VW's that have this same problem they got around it with just disconnecting one of the wires on the brake switch, and he's waiting to hear back on Euro code for the dme and maybe some different performance code GT3.

Marco Polo

On further experimentation, I believe that there is some limited simultaneous brake and acceleration function: the throttle cut-out seems to be progressive. I expect it is a 2-stage process with throttle continuing under very light braking.

I was too insensitive to detect this using left foot braking, but trying a heel/toe-style actuation of the brake without disengaging the clutch, I felt certain that I could detect some small bit of braking before the throttle cut out.