I'm going to run my lightweight Cayman S there either Wednesday March 18th, or perhaps the 25th, or maybe both. Does anybody want to join me?? Hopefully someone who knows something about drag racing, as I don't know a thing about it!!
Re: Wednesday Night Drags at Sears Point (Infineon)
Fort,
If you get there early, you can usually get 3 practice runs in before the elimination heats start. I highly recommend this. Consistency is more important than outright speed as the elimination heats are handicapped. During elimination you get to specify how fast you think your car will run the 1/4 mile. The goal is to get as close to your "dial-in" time as possible without going over. I've seen a grandma in a minivan with an automatic transmission take out loads of high schoolers in hopped-up Hondas.
On your street tires, there's very little benefit to doing a big, long, smoky burnout other than to impress the crowd and keep the folks at The Tire Rack happy. I'd recommend a short burn out just to clean off your tires and put a little heat in them.
Most of all, have FUN! Hope to see you at Alameda for the season autocross opener this Saturday.
Alan
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Re: Wednesday Night Drags at Sears Point (Infineon)
Originally Posted by Alan28
Fort,
If you get there early, you can usually get 3 practice runs in before the elimination heats start. I highly recommend this. Consistency is more important than outright speed as the elimination heats are handicapped. During elimination you get to specify how fast you think your car will run the 1/4 mile. The goal is to get as close to your "dial-in" time as possible without going over. I've seen a grandma in a minivan with an automatic transmission take out loads of high schoolers in hopped-up Hondas.
On your street tires, there's very little benefit to doing a big, long, smoky burnout other than to impress the crowd and keep the folks at The Tire Rack happy. I'd recommend a short burn out just to clean off your tires and put a little heat in them.
Most of all, have FUN! Hope to see you at Alameda for the season autocross opener this Saturday.
Alan
Thanks for the tips, Alan. Sadly, I can't make it Saturday...
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Re: Wednesday Night Drags at Sears Point (Infineon)
Heres the go:
1. I tried it without the burnout. Very bad, I did a wheel spin in 1st, 2nd and 3rd gear. Do the burnout!
2. Even when doing a burnout will not be very big anyway. Too much grip will limit this anyway.
3. I needed to do a partial clutch dump. Meaning dont fully dump it nor feather it.
4. Rev to around 3KRPM. Too little and it will bog down. Too much much, watch out. Start with 2K if you like, no less.
5. Release the clutch and add gas at the same time. This is the hard part and if you do it right the RPM will not drop and just rise as when fully engaged.
You can see from this vid that I got so much grip in the burnout stage I overshot the start line! LOL
Re: Wednesday Night Drags at Sears Point (Infineon)
Originally Posted by 4by4
Heres the go:
1. I tried it without the burnout. Very bad, I did a wheel spin in 1st, 2nd and 3rd gear. Do the burnout!
2. Even when doing a burnout will not be very big anyway. Too much grip will limit this anyway.
3. I needed to do a partial clutch dump. Meaning dont fully dump it nor feather it.
4. Rev to around 3KRPM. Too little and it will bog down. Too much much, watch out. Start with 2K if you like, no less.
5. Release the clutch and add gas at the same time. This is the hard part and if you do it right the RPM will not drop and just rise as when fully engaged.
You can see from this vid that I got so much grip in the burnout stage I overshot the start line! LOL
4by4, that is just an incredible time!!! Thanks for the launch tips - I'm going next Wednesday!
Re: Wednesday Night Drags at Sears Point (Infineon)
Originally Posted by 4by4
Heres the go:
1. I tried it without the burnout. Very bad, I did a wheel spin in 1st, 2nd and 3rd gear. Do the burnout!
2. Even when doing a burnout will not be very big anyway. Too much grip will limit this anyway.
3. I needed to do a partial clutch dump. Meaning dont fully dump it nor feather it.
4. Rev to around 3KRPM. Too little and it will bog down. Too much much, watch out. Start with 2K if you like, no less.
5. Release the clutch and add gas at the same time. This is the hard part and if you do it right the RPM will not drop and just rise as when fully engaged.
You can see from this vid that I got so much grip in the burnout stage I overshot the start line! LOL
That was great. Now we need an off road video. LOL.
These Caymans can do it all!
Nice run. What was the car you ran against? It looked like it should have run away. Classic.
Re: Wednesday Night Drags at Sears Point (Infineon)
Not sure what the other car was, maybe a General Motors Holden Torana SLR5000. 5L V8 worked, not 100% sure. Kinda old school muscle car N/A.
I'll give it another go when I get the 4.1 ver flash and put on my new rims I got yesterday. With 30 profile rear tyres now I will have a more favorable final gear ratio. Heck, maybe I will even try race fuel.
Who said the Cayman is no good as a drag car?
To be honest, this is the last thing I ever thought I would do. Heck, I never intended to modify or even race the car when I purchased it!
Re: Wednesday Night Drags at Sears Point (Infineon)
Originally Posted by 4by4
Not sure what the other car was, maybe a General Motors Holden Torana SLR5000. 5L V8 worked, not 100% sure. Kinda old school muscle car N/A.
I'll give it another go when I get the 4.1 ver flash and put on my new rims I got yesterday. With 30 profile rear tyres now I will have a more favorable final gear ratio. Heck, maybe I will even try race fuel.
Who said the Cayman is no good as a drag car?
To be honest, this is the last thing I ever thought I would do. Heck, I never intended to modify or even race the car when I purchased it!
What was your trap speed on the 12.6 run? Can you scan and post ypur timing tickets? Thx.
P.S. Link may be down for a little while. Just updated dragtimes, temp was wrong, was 96F not 55F
That time/speed combination is puzzling to me... A stock Cayman S runs something like 13.3 at 105 (see Planet Porsche - FAQ: Cayman Technical Data). Your run was 12.6 at 107. I don't know how it is possible to shave 0.7 sec off the 1/4-mile time with only a 2 mph increase in trap speed. 4x4, can you shed any light on this??
I ran 13.0 at 109 (details in a subsequent post). These numbers are consistent with what would be expected for a lightened car with a power bump - a modest decrease in ET with a commensurate modest increase in trap speed. Your results are strange - a huge drop in ET but not much change at all in trap speed.
Re: Wednesday Night Drags at Sears Point (Infineon)
So I went to the Wednesday Night Drags on March 26th. It was quite an experience! There were maybe 200 muscle cars, race cars, and stock street cars there. There was only 1 Porsche!! The summary on their web site was pretty accurate: "Anyone with a driver's license can compete, providing their vehicle or motorcycle passes a simple technical inspection... ...The event attracts a varied crowd, including teen-agers, mothers, working professionals and grandparents racing everything from Corvettes to Mini-Vans." The cost was only $25.
There were several classes available to enter. I entered "Sport Street - Open to street legal vehicles with a maximum of 6 cylinders 12.00 and slower." I got 2 practice runs, and then the bracket racing elimination runs began. I won my 1st elimination run when my opponent red-lighted, and was eliminated on my 2nd run when I launched especially badly.
There was not a lot of explanation provided on the mechanics of how to run, and I didn't know a thing about it. But the other drivers were friendly, and by asking lots of questions I was able to figure out more-or-less what I was supposed to do to stage, launch, and run the 1/4.
Conditions: Sears Point is right at sea level, but it was a warmish evening for the season, and the temperature was 68 F. This resulted in a power reduction of about 0.7% compared to standard conditions. More significant was the 20 mph headwind blowing straight down the track! I was happy to be in my little Porsche instead of a muscle car with that wind blowing. My car was about 200 lbs below stock, but I did not have my lightweight battery or RS98 wheels on, so it was just PS2 street tires. Other details of my car's configuration are in the garage link.
My best run was 13.039 at 109.20 mph. See the timing ticket posted below. I was pretty happy with that result, as I smoked lots of modified muscle cars, including Mustangs, Cobras, Camaros, and earlier Corvettes. The newer Corvettes were much quicker than me.
I never did get a good launch. The Cayman is not an easy car to launch. I have a Quaife TBD installed, and that helped, but if I engaged the clutch too abruptly, or was carrying too many rpm's before launch, then ferocious axle hop would result. Even on my best run I had so much axle hop that I had to back off the throttle for a bit until the car could hook up. I'm sure I can get into the 12's with a decent launch... The new cars with PDK and launch control should be incredibly easy to drive and consistent drag racers. I can see one of those cars as being a very competitive bracket racing machine because of their consistent launch.
All in all it was a fun new experience. I'll definitely go again!
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TBD - Torque Biasing Differential
With an ordinary open differential, a lot of precious power is wasted during wheel spin under acceleration. This happens because the open differential shifts power to the wheel with less grip, along the path of least resistance. The torque capacity of the TBD/ATB unit is increased or decreased by varying the helix and pressure angles of the gear teeth. The operation is automatic and the unit is a direct replacement with the stock differential. There are no clutch plates as in more conventional limited-slip designs.
The Torque Biasing Differential or A.T.B., however, does just the opposite. It senses which wheel has better grip, and biases the power to that wheel. It does this smoothly and constantly, and without ever completely removing power from the other wheel. In drag-race style, straight-line acceleration runs, this results in a close to ideal 50/50 power split to both drive wheels, resulting in essentially twice the grip of an ordinary differential.
To see the installation of a TBD style unit Click Here
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