kingleh

In the cup car seems like the brake bias was more to the front so if u really needed it u could use the motor to slow down the car. Like when ur dive bombing someone. I dont use it to slo down the car eveytime i hit the brakes tho.

I think its just the way to do it. Makes the braking smoother. I dunno its just the way to do it. I used to skip gears when i first started. To me it jsut makes eveything go smoother when you sequential.

kingleh

Its the "RACECAM" with a sony mini DV used as a recorder.

993Cabriolet

Now the worst part for you: WE WANT MORE!!!!!!!!!!!!! Thanks for the video, the adrenalin shot was incredible, even from the seat of my desk

PatK-Mpls

Thanks, Leh. Your response regarding the brake bias offset is the best reasoning I've heard yet in favor of sequential downshifting.

FineProperty

Wow...Thanks for posting. Great Vid. Great drive!

David Ray

Great video and nice run - hope you have similar laps in your race.

enthusiast

Kingleh

Thanks for the video. A lot of talent and experience on this site. I'm still confused on the downshifting for these cars from your video and other 996 RSR or Cup car in car videos I have watched.

So... ignoring the braking process and concentrating on the gearbox you do the following?

1. lift off the accelerator

2. shift to neutral (Step #1 unloads the gears so you can pull it out of gear with just the shifter)

3. blip the accelerator

4. press clutch pedal in

5. shift to lower gear

6. let clutch out (engaged)

7. repeat for the next downshift with steps #2 thru #6



Can't rev up the gears with the engine unless the clutch is engaged (gear box in neutral) everyone agree?

With regards to engine braking, for these 996 racing models I don't think there is much engine braking to be obtained regardless of the process. Sequential downshifting would provide the least since you are clutching more.

Stuttgart

full throttle
hard brake
and then in one fluid movement depress the clutch, blip the throttle while changing gears and braking, then engage the clutch.
repeat

its like a golf swing, if you try and think your way through it in steps you're going to screw it up

ColorChange

Leh: Jaw dropping awesome work! Thanks.

I too am really trying to understand your shifting, as it's so freakin' lightning fast that I want to learn this !!!

As 993-996 says, are you traditionally double clutch downshifting, or slipping it into gear closer to what Stuttgart says. Please describe exactly what you are doing ... and then how the hell we can learn it.

TIA

enthusiast

Stuttgart

I think you are trying to be helpful and I appreciate the golf swing analogy. However, as you describe it you are blipping the throttle with the clutch in (disengaged). That does nothing to rev up the transmission input shaft to match the revs of the output shaft.

ColorChange

With this video and some others for this model of car I see no evidence of double clutch downshifting only single clutch action and possibly "slipping" or "floating" engagement of the next lower gear.

38D

I think stuttgart describes it correctly. Push in clutch, rev engine, release. The synchros take care of getting the input shaft to match the output shaft (with clutch disengaged), so you are just trying trying to match the engine speed to the output shaft speed. Unless this is a dog box...

enthusiast

Thanks Stuttgart and Pesky 914 for your comments.

Here is the summary for downshifting a 996 GT3 Race Car.

1. Off the throttle

2. On the brakes hard

3. Threshold brake and do the following in one fluid movement

press clutch in, blip the throttle while changing gears, and let clutch out

4. Repeat Step #3 for every downshift desired

5. Off the brakes and Ease on the throttle (or use trail breaking technique)


This is a single clutch downshift where the transmission input shaft depends on the synchronizers to match the speed of the output shaft. The blip of the throttle gets the engine speed up to match that of the output shaft.

penguinking

this may be too complicated, but is there room to left foot brake, then transfer your right foot onto the brake pedel, then continue to downshift as usual? just a thought

RedlineMan

One point Y'all might want to consider;

The shifting is dazzling and all, but it is being done on a race transmission that gets serviced every 30-40 hours. Engine too. I'm not sure I would try it with a street car, or any car without a Cup/R/RS racer's budget!

TD in DC

So what do you recommend for daily drivers that also get used for DE events?