how about that 915?

[autoxracer31]

So, I tried to drag race my 911 today.

Bad idea to say the summarized version. I was Smoked.

Can anyone give me some tips in regarding drag racing with a 915 transmission?

It felt like when i dropped the clutch the engine sputtered and almost died. it felt like 3000 3000 3000 500 1000 2000 3000 4000 5000 6000 6500 shift.
It was so weird!!!

How do you get rid of that dead spot and get all the power in 1st??

[Jim Sims]

Buy a Camaro; the 915 isn't intended for drag racing and will fail under said use. 915 synchro parts are not cheap. Cheers, Jim

[jazzbass]

Originally posted by autoxracer31

Can anyone give me some tips in regarding drag racing with a 915 transmission?

Umm... don't?

There is no good way to drag race with a 915, at least not any I've ever driven. You could work on double clutching to increase the speed of the shift, but that still doesn't change the fact that the poor little 915 doesn't like at that kind of stress.

[ubiquity0]

Not to mention you have so much traction w/ the rear engine that you're more likely to get clutch smoke than tire spin.

[1fastredsc]

Um, besides the advice that was already given, which is don't do it, that is kind of odd that the car would do what you describe. Not sure what it is though so no advice except don't drag the 911, instead, do rolling starts in second if your going to race

[masraum]

You shouldn't be getting the bogging unless you aren't on the gas, it may bog a little because of all of the traction, but it shouldn't bog from 3000 to 500 and then go back up.

If you want to drag race and you want to launch you are probably better off slipping the clutch. Launching by dumping the clutch is going to result in wheel hop, broke stuff, and a higher price tag than just wearing out the clutch. Besides, if you slip the clutch you can keep the revs up.

[KobaltBlau]

Originally posted by jazzbass
Umm... don't?

Word.

[Paulporsche]

autox,

You may have another problem as masrum suggests, since that seems like excessive bogging. Check your mixture (too lean?) your timing (too advanced?) your fuel and control pressures, your vacuum enrichment on your WUR , and your distributor. Also, the condition of your cap, rotor and wires.

[Gunter]

Another misguided "Lead-foot"

[IROC]

A bunch of guys I work with are all "Detroit Iron" types of guys that go to the local 1/8 mile strip occasionally. I tagged along once in my 911 (still with the stock 2.7). I was so clueless as to drag racing that I had to ask what the lights on the tree meant. :>)

Anyway, I didn't abuse the geartrain at all....I engaged the clutch fully without much slipping before nailing the throttle. My 275/40 rear tires enabled me to make the full 1/8th mile in 1st/2nd gear.

I won one race and finished .2 seconds behind some hopped up Mustang GT on the second one.

Fun, but I'll stick to road courses...

Mike

[beepbeep]

Rev it to 5000 RPM, dump the clutch and feed in the accellerator...watch for excessive revs, shift at 6500...

[SC-targa]

Why blame the tranny. The engine sputtering/bogging has nothing to do with the 915. That's you and your clutch/throttle technique.

Then someone else recommended that "You could work on double clutching to increase the speed of the shift." What? Double clutch is to match the spees of teh rotating parts of the tranny for a down shift, not upshift, and to make sure down shifts don't upset your cornering.

If you have a complaint about slow shifts, that is related to the 915 and the Porsche style baulk ring synchros. They do not allow rapid shifts.

[concentric]

I've dumped the clutch only once, but never got what you described, the car just took one big hop and took off like a bat out of hell. Clutches are for slipping, not dumping IMO.

JCM

[k9handler]

don't...as others have said. I learned my lesson (13.4 @ 108) and maybe next year when the tranny finally fails I will post the cost to replace my tranny.