NZ951

Traps are so bad as the 60ft times are shocking... And I have traction issues.

hosrom_951

If the Link2 can control wheelspin, then why don't you try and see? and yes, i suspect that your spool wasn't really effective as you mentioned.

I shall try today to hit the stock 13.5 seconds claimed by Porsche

NZ951

Link cannot control wheelspin, just control the launch by maintaining rpm and rpm increase once the clutch is released.

hosrom_951

hmm........by maintaining rpm means that it doesn't allow it to revv higher while there is a spin? keeps it low if there is a spin? or how does it control the rpm?

NZ951

predetermined

hosrom_951

I see..........that would help!

NZ951

Yeah, I have to setup a switch under the clutch, not much work but something still. Did you get my reply about the 968 temp gauge question you sent me?

hosrom_951

I did, but it was soo late (early 2:30am) that i MAY have deleted your message instead of the conformation if you still have it saved in your sent messages, would youi be ever so kind enough to resend it?

NZ951

Done.

I will probably need a new clutch after testing the setting up the launch control. I really need specific clutch attributes so I can source the best fit for purposs...

hosrom_951

Lindsey have some clucth packages.

As for the flywheel is concerned, there are two things.

1) Geta lighter aluminium fluywheen (anywhere from $500+)

2) Skim the factory, here is where i know that there are limits, but how much? and how much weight can you remove?

Even if remove so much weight from the stock, would it be as effective as the aluminium?

NZ951

The Fidanza ally ones are $329. The LR clutches are not unique, they are just ones you can get from any clutch shop, and for cheaper. But they do give an indication on the level, I think I will go with a Spec clutch... level 2-3 sprung and non brass button. I still need to slip it a wee bit once launch is sorted.

WesM951

Hmm... your 1/4 mile times sound way off. I trapped 97mph with my car on a gtech pro. Only did 1/4 mph speed not actual time. Bogged launch and 3rd miss.

NZ951

I know, I can only bring it down to driver sucks. I will have enough go at it after I get back from China. I do need a new clutch, it just aint holding the power.

Danno

" I doubt somone could get 13.5 from a stock 951!"

One of the car-mags got that on a stock TurboS. Typical figures I've seen are about 13.7-14.1 for TurboS.

Ok, I confess to being an ex-ricer & drag-racer. But that was with my previous car. But I did have to do a lot of tuning with the nitrous to get quick launches and fast time. Got it down from stock 15-16s down to the low 12s. The trick was programming the nitrous controller to bring on power gradually rather than all at once, such that the engine is always just a little ahead of the tires, but not too much. In effect, traction-control.

I agree, you CAN drag a 951; you just have to use a slightly different technique than NA cars. The only pitfall to drag-racing a 951 is cost; can't quite replace a clutch for $300 like on a 5.0 Mustang. But, you can get superior performance.

What I've found to work really well, is to customize the shape of your torque-curve. The biggest problem with traction on the 951 comes from boost hitting really hard in a narrow RPM-range. This generates a torque-curve that's concave (looking down from the top), and the curve rises very sharply, often times having an increase of over 100 lb-ft in less than 2000rpms. This simply breaks the tires loose and you get nowhere. An example of this type of a torque curve can be found here: peaky

So what you can do is program the boost-curve in the Link so it comes on really fast in the low-end from 2000-3000rpm. Then from 3000-4500rpm, roll it off a little around the torque-peak, then roll it back up afterwards to flatten out the torque curve. The result is a wide and flat torque-curve, like this one. The wide and flat torque-curve gives you constantly fast acceleration over the entire RPM-range. Also peak HP is made at redline. So you can redline the car to get maximum-speed without having to worry about the torque and HP curves dropping off.

NZ951

Yes, tuning is something I have yet to look at seriously, but will need to do on the dyno... Are you still going to look at developing cams Danno? I think thats my next engine mod. Maybe crank...