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Join Date: Feb 2005
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I do have a 930, an 87 slant. The main reasons why a factory 4sp 930 can produce good 60' times by dumping the clutch is simply the gearing - our 4sp is factory geared for roadracing, not the drag strip. First gear in the 930 is waaay too tall for the drag strip, but it does allow you to almost hit 55mph in first gear from a standing start, and actually downshift to first while moving to get in and out of a tight corner. The G50/50 5sp has a little bit shorter first gear, but even it would benefit from a higher numerical ratio R&P to bring it on the pipe faster. The main reason that the guys who 1/4-mile turbo Porsches start out with n/a cars is the gearing - the turbo is 9.495:1 first gear (2.25:1 gear set and 4.22:1 ring/pinion) while the G50 Carrera is 12.04:1. The 915 trans is also better geared for off the line starts with a 12.33:1 first gear.

Basically, if a 930 was geared from the factory like most other 'street' cars are (~12:1 first gear to the wheels), dumping the clutch at say 3000 - 3500 RPMs whould put the tires up in smoke - effectively the stock 930 first gear is closer to second gear in most 1/4 mile setups. You would need to slip the clutch on a 930 if it was properly geared for the strip in order to get the most out of it....

Also, not trying to have a pi$$ing contest or start anything - although as I said, I don't have much interest in this kind of racing anymore. But, for the record, here is a link to the shop I worked at as a kid - the vocational school was not in operation when I was there, but now they are a highly regarded machinist trade school.

http://www.rcsams.org/

Enjoy!!

Pat Kelley
Old 04-17-2007, 06:11 PM
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Quote:
Originally posted by kellcats521
I


Also, not trying to have a pi$$ing contest or start anything

Pat Kelley
Lol, yeh I know.
I have always been extremely tough on my cars, street or race. I have also been told that my many driveline failures were due to my abusive starts, lol, but I always managed to post pretty good times in spectacular fashion, never crashed though.
I still like drag racing but prefer track work. I just like all things fast, lol. Just wish we had Autobahn here in Oz.

Cheers Pat

Scott
Old 04-17-2007, 10:38 PM
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Old 04-18-2007, 08:08 AM
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Old 04-18-2007, 08:10 AM
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Old 04-18-2007, 08:10 AM
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Old 04-18-2007, 08:10 AM
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Old 04-18-2007, 08:10 AM
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Old 04-18-2007, 08:10 AM
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Old 04-18-2007, 08:10 AM
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Old 04-18-2007, 08:10 AM
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Old 04-18-2007, 08:10 AM
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i like controversy sometimes.i remember on the old 911turbo site when it was popular(to bad he changed the format).i posted that on roll on i could keep up with a friends honda 600 f4i.no body believed me(had a hard time believing it myself actually).or the guy didnt know how to ride.anyways back to dragging.any other kills out there.
Old 04-18-2007, 11:34 AM
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Quote:
Originally posted by rg500930
i like controversy sometimes.i remember on the old 911turbo site when it was popular(to bad he changed the format).i posted that on roll on i could keep up with a friends honda 600 f4i.no body believed me(had a hard time believing it myself actually).or the guy didnt know how to ride.anyways back to dragging.any other kills out there.
Life's to short to give a crap what other people think.
Old 04-18-2007, 02:15 PM
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Originally posted by dewolf
Sorry, have to disagree. The more dramatic the takeoff the faster you will accelerate, sure you'll have wheelspin, but if you can hold it you will out accelerate a clutch-slipping takeoff. 500-600RWHP turbo cars will spin on boost regardless. If I clutch-slip a takeoff against a friends very warm WRX he gets me initially. If I rev 6-7k and dump the clutch he can't get anywhere near me. I get wheelspin, but I am accelerating quickly too. I doubt whether you'd find a clutch slipping drag racer.
I have owned some 10-11sec street cars and was into drag racing some time ago ( modded 'street ' cars ) and I can't ever remember slipping the clutch to get a better time. It's dump and burn man.
Yes you risk the drivetrain, but smoking clutches are'nt pretty either, to the disc or the flywheel. If you've seen the in car vid of Juan Riez? pull a 10.4, there ain't no clutch slipping there.
My whole answer was based on how to not dump the clutch and still get off the line. You are taking the approach of just dump the clutch and forget about tommorrow, whereas I will never knowingly dump the clutch on my car because I don't want the repair bill.

Sure, dumping the clutch is always the easiest way to launch hard, but if you are trying to be a careful owner of a vintage Porsche on the street, I doubt that you are going to dump the clutch very often. Thus, I was describing how I get decent launches with the most traction I can at any given street corner without dumping the clutch. As many times in a row as I want to practice with no fear of damage.

My car doesn't have uncontrollable wheelspin, since my gearing and light weight is probably more key to quick times than outright horsepower. I have dialed back to 1 bar, and don't have over 400 hp to begin with.
Old 04-18-2007, 05:16 PM
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Quote:
Originally posted by dewolf
Lol, yeh I know.
I have always been extremely tough on my cars, street or race. I have also been told that my many driveline failures were due to my abusive starts, lol, but I always managed to post pretty good times in spectacular fashion, never crashed though.
I still like drag racing but prefer track work. I just like all things fast, lol. Just wish we had Autobahn here in Oz.

Cheers Pat

Scott
I think you have nicely summed up the difference between your style and mine in this quote.

I imagine that if we met at a stoplight, you would consistently beat me off the line until the day that your drivetrain ****s itself.

But that's life. Different strokes for different folks.
Old 04-18-2007, 05:23 PM
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I kind of like getting a stealth start, with little commotion, and then screaming by somebody like they are standing still as soon as I rev out second gear. It always makes it seem like they were trying so hard to impress, and still get their lunchbox kicked in by my 30 year old car.
Old 04-18-2007, 05:29 PM
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As it turns out I had a bit of a run this morning with a 300ZXTT and a Falcon XR6T ( Ozzy car, 240KW standard, this was prob 280KW), I done my smoke the tyres launch and whipped them to 80kmh where I backed off, speed limit reached. They both continued on only to get busted by a COP with a hand held radar, lol. I just cruised by casually, of course wiping the sweat from brow!
They would have been doing well over 120kmh, which is license losing here in Sth Oz.
Moral of the story, Don't mess with Porsche's!
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Old 04-18-2007, 06:03 PM
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Quote:
Originally posted by dewolf
As it turns out I had a bit of a run this morning with a 300ZXTT and a Falcon XR6T ( Ozzy car, 240KW standard, this was prob 280KW), I done my smoke the tyres launch and whipped them to 80kmh where I backed off, speed limit reached. They both continued on only to get busted by a COP with a hand held radar, lol. I just cruised by casually, of course wiping the sweat from brow!
They would have been doing well over 120kmh, which is license losing here in Sth Oz.
Moral of the story, Don't mess with Porsche's!
AMEN TO THAT, my boost junky brother
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Old 04-18-2007, 07:04 PM
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Im sorry about the repeating post- My computer went ape-$hit when I was signing off- thats really weird. It opened the window 127 times for the Pelican website
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Old 04-19-2007, 12:32 PM
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