Landseer

Definitely. Be safe, Brett. You wouldn't want to grenade something infront of a crowd. Study scattershields. http://www.jalopyjournal.com/forum/s...=scattershield

Tim Murphy

I've driven my car with about 600 rwhp and it is a handfull at that level.

2000 HP at the push of a button would be instantly out of control in a 928.

Brett928S2

Hi

For those like yourself whom are genuinely interested, I have just heard that the new system is nearly finished and I will arrange a date tomorrow to go to Doncaster to Wizards of Nos for the fitting by them and myself.

I will take photos of as much as I can although there will be some limitation on what I show as this is only the second system of its type in the world and some of this stuff is not intended for public knowledge yet.... (the first Revo - 2000 hp system is on an American Pro Mod car, out of interest)

I just hope that the series of photos will be received by the technically minded a little better than the state this thread has deteriorated into....

All the best Brett

dprantl

+1. I currently have not more than 450rwhp and 275/35-18 street tires in the back. In a straight line in 2nd gear even above 90 deg F, I get the PSD light. In 3rd it hooks up all the way as long as I am smooth with the clutch engagement, but if I try to take even a slight turn, it is end-swapping time. With a little less than FOUR TIMES the power to the ground, WOT really would be unmanageable in any gear other than 5th unless you have LSD and drag slicks in the back.

Dan
'91 928GT S/C 475hp/460lb.ft

ptuomov

In which way was it a handful? I am assuming traction was the problem, which leads to the next question: What tires?

I am planning on getting Yokohama Advan Neova ad08's, 255/35R18's in the front and 295/30R18's in the back. When warm, those should hold up pretty well, no?

Tim Murphy

Actually, they scary part is 4th gear on a "slight" curve at WOT and the rear starts drifting out. If you let it get too far you would never be able to save it.

In a straight line at 80-90 MPH and pressing the 2000HP button the tires would wick up so fast the car would drift one way or the other. In panic mode, which it would be, you would lift and the car would snap back and then out of control (unless you can program your brain to let go of the steering wheel you might save it, maybe).

The only time this was really an issue for me was on a cool day (60F) and not so warm tires. 295/35/18 P2S If I would have let it go for half a second more, I would have lost it. This is why no one drives this car but me.

GlenL

Rock on, Brett!

(And get some video when the rocking is being done.)

Landseer

Its very technical Brett, always has been. Don't hurt yourself or some kid with that stuff.

Tim Murphy

+1

And please, that goes for everyone that is cranking up the power on these cars.

It's a lot of fun but it definitely comes with responsibility as well.

I would be devastated if something bad happened to anyone.

Be safe!

ptuomov

That's fairly fast.

One of the good things about Brett's system is that it's not on/off. It'll build gradually and can be mapped based on a lot of things. Not at all like the US drag racing systems. Not pissing on the US drag racing systems, those are great for drag racing -- but not for the street.

That's over 26 inch outside diameter, that's large.

I have PS2's on my wife's 2006 997 c2sc. They seem to work reasonably well even on a cool day. I have heard that the Yokohama Advan Neova ad08's are much more sensitive to low temperatures.

Do you have a link to a post or web page about your car?

Landseer

Its the centrigugal force and the acceleration components and dynamic balance that he needs to worry about. This one is over the top.

brianrheffron

My old gran used to say, " Speak of people as you find them".

Following up a particular question I had regarding part of an
older thread I e:mailed Brett "off forum". I was looking for
some technical information on semi rigid nylon high pressure
fuel pipes.

Brett replied very promptly to this and several subsequent e:mails
and was totally helpful giving me specs for the pipes and the special
connectors needed, links to suppliers for both and even contact details
for the garage that works on his 928. He has been interested, helpful,
accurate in all his information that I followed up on and friendly with it.

In Glasgow where I live he would be called "a real gen kiddy" and in the
Bournemouth area where he lives I think "diamond geezer" is the appropriate term.
Thanks Brett for all your valuable help.

Mike Simard

Here's what I find with 640 or so whp. Pretty much anytime you apply heavy throttle at any street speed, the tires spin. That's both 295/18 R888's on a lightweight car. Even when they aren't blatenly spinning and you don't think they are, you can later come back by and see these 2 light black marks for hundreds of yards where throttle was applied.
Cars like this tend to do the same thing on track and lightly spin down straights, thereby eating tires and making racing painfully expensive.

If the tires would just hook up when tooling around it would be an absolute hoot!
Sometimes I wish I had drag tires that hook up cold just to experience the real acceleration.

John Speake

Has anyone ever tried getting some rear squat on the 928 under hard acceleration ? I read somewhere that Porsche designed the 928 to not hunch down at the back, but it seems to me that it could be an advantage ?

ptuomov

Those are good problems to have, problems that I wish I will have one day! ;-)

I can control the situation a little bit because I have a gear and rpm-specific boost controller. I am planning to set a flat torque curve per gear such that the wheel spin is more predictable.

At what speed does the wheel spin no longer occur with your car?