Going Drag Racing Tomorrow
#11
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It seems that my info was incorrect for the final drive ratio, but about the traction off the line, its pure physics, let me see some videos where you take off with both wheels spinning for more then couple of seconds, and when moving off. I tried to get a decent start with mine last year, and couldnt... With quaife there is no problems ofcourse, and just got my brand new Michelin pilot sport 285 rears, so the drag should be fun. The only problem is automatic transmission stall-speed (i hold the car with break till about 1500-1700 rpm). I try to aim low 14 or maybe a bit under, but its really difficult, because dragraces here are on old airfields, wich have concrete and burned street tire crap all over it, its like riding on plastic:-(
#12
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Originally Posted by Alfonze' post='942674' date='Jul 15 2009, 06:42 AM
It seems that my info was incorrect for the final drive ratio, but about the traction off the line, its pure physics, let me see some videos where you take off with both wheels spinning for more then couple of seconds, and when moving off. I tried to get a decent start with mine last year, and couldnt... With quaife there is no problems ofcourse, and just got my brand new Michelin pilot sport 285 rears, so the drag should be fun. The only problem is automatic transmission stall-speed (i hold the car with break till about 1500-1700 rpm). I try to aim low 14 or maybe a bit under, but its really difficult, because dragraces here are on old airfields, wich have concrete and burned street tire crap all over it, its like riding on plastic:-(
#14
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You cant see if there is a 2 wheel burn in the first vid, there is a lot of smoke, and maybe the car has a lsd/atb... The other 2 are a joke:-P
I dont justify burnouts other than to warm up the tires before a drag race on legal event, but if i spin a wheel every time out of the corner, or get stuck in the snow etc, i really hate it, so diff is the must have mod, the same goes for the soft and good gripping tires (yes they wear, but traction is really important), other bling can ofcourse follow, but first of all the car must be drivable and not some kind of a cripple:-P
I dont justify burnouts other than to warm up the tires before a drag race on legal event, but if i spin a wheel every time out of the corner, or get stuck in the snow etc, i really hate it, so diff is the must have mod, the same goes for the soft and good gripping tires (yes they wear, but traction is really important), other bling can ofcourse follow, but first of all the car must be drivable and not some kind of a cripple:-P
#15
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i agree that these cars rear setup sucks. my 93 mustang had an auburn posi unit, 3.73 gears, mooser 31 spline axles, c clip elminators... needless to say i was spoiled. no rear setup will compare unfortunately
#16
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My car has no LSD but will spin up both rears at the same time if im straight, no problem at all.
BTW OP:
Do you have any experience with the Gtech Pro RR's ??? or in fact anybody else.
I ran my car on cold winter roads and run flats with a tuning box fitted and was very pleased with 14.7![Smile](https://5series.net/forums/images/smilies/imported/smile.gif)
The Gtech kit claims to be super accurate and acredited by drag racing assosiation in the USA or something.
BTW OP:
Do you have any experience with the Gtech Pro RR's ??? or in fact anybody else.
I ran my car on cold winter roads and run flats with a tuning box fitted and was very pleased with 14.7
![Smile](https://5series.net/forums/images/smilies/imported/smile.gif)
The Gtech kit claims to be super accurate and acredited by drag racing assosiation in the USA or something.
#18
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It really depends a lot on how accurate you setup your weight, thankfully I have a local trade weight bridge nearby, my car is 1740kg with me in it and quarter of a tank of diesel.
What model is yours Alfonze ??
Sorry to the OP for going off topic here
What model is yours Alfonze ??
Sorry to the OP for going off topic here
![Wink](https://5series.net/forums/images/smilies/imported/wink.gif)
#19
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Originally Posted by Phantom Mark' post='943944' date='Jul 16 2009, 06:27 PM
It really depends a lot on how accurate you setup your weight, thankfully I have a local trade weight bridge nearby, my car is 1740kg with me in it and quarter of a tank of diesel.
What model is yours Alfonze ??
Sorry to the OP for going off topic here![Wink](https://5series.net/forums/images/smilies/imported/wink.gif)
What model is yours Alfonze ??
Sorry to the OP for going off topic here
![Wink](https://5series.net/forums/images/smilies/imported/wink.gif)
Weight is around 1625kg when racing on event, the G-tech test was with full tank and all the junk in the trunk and rear seat in the car, so around 1700kg-s. The mods that are listed below are after a test with g-tech (only diff was installed).
Mods that affect performance:
Quaife ATB differential
285 wide Pilot Sport PS2 (the tires are M5 profile, to get to 60mph with one less gearchange, on the road i have less rpm and on the start i have a bit less Nm to the wheel, so i can get better traction, not to mention on a mile long stretch i should get bit faster)
modified exhaust (rear muffler is 3" straight through)
When starting off i use the brake to hold the car until around 1500-1700rpm, and try to get off with minimal spin (wich isnt hard with a good diff and tires:-))
The g-tech quarter mile time was a dissapointment, but the top speed was really good, on an event i could only get about 100mph, so room for improvement. And maybe the mods help a bit:-)
I am doing dyno tomorrow, to see the changes with couple of engine tweaks and rear muffler, and plan to go to atleast one mile challenge and couple of quarter mile events. (I hope to achieve 235kmh on one mile and under 14sec quarter mile)
Sorry for offtopic.
And to the topic a bit also, how did it go? :-)
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