Edcase

Ok its my first 4x4 and I've noticed it needs a lot of revs to get away from the lights cleanly, but I don't want to punish the clutch.

What's the best technique of making a clean, fast, safe start?

rich uk300

i generally use less than 2000revs to pull away fast on the road,but at santa pod its about 4-5000 revs,all depends on how long you want your clutch to last

Katana

6000 rpm and dump the clutch HARD. You've then got less than 0.5 seconds to shift to second. If your synchros survives shift into third quickly. Thats how I beat rich.

its a joke rich.

[Edited by Katana - 11/26/2002 6:06:11 PM]

rich uk300

i know

Chip_Butty

I havent got 4x4 but I understand the best way is to side step the clutch. Let clutch slip dial in about 4500 revs then as it bites dump the clutch and floor the throttle ?? A colleague used to do that with a Delta Integrale Evo, awesome car in its time

Katana

Not many Astons in Santa Pod.

N1 SPAN

How Quick do you actually want to get away? Really, there is not a lot on the road that can touch these things up to the national speed limit. Just try easing the clutch out at just over 1000 revs then let the engine do the work. This should save clutch and gearbox. If you have a big enough wallet then proper standing starts as described in others comments are fine. Scoobies are not unbreakable though. Just think of the forces 250 lb/ft sticks through your clutch and drivetrain in one jolt. OUCH......

P1Fanatic

1000 revs - are u having a giraffe???????

N1 SPAN

Not sure what 'having a giraffe' means, not heard that one before. Guess you mean, am I taking the p*ss. OK OK, perhaps that's not how many people, including me set off most of the time, but his car would last forever......
As that went down like a warm cup of sick, I would recommend you work out whatever is best for you, but unlike rear or front wheel drive cars, you will not get wheel slip, therefore drivetrain takes all!!!

chrisp

scooby doo --> subaru

giraffe --> laugh

I guess

I always get the car moving, less strain on the oily bits.

N1 SPAN

Doh - Cheers

barge

Katana


There is 1 Aston that I know of at the pod.




Steve Neimantas & its street legal

S55DRJ

When i was doing the silverstone rallysprints, i.e. tarmac starts on gravel tyres, i found 6500-7000 and dropping the clutch\flooring the throttle to be very effective!! Honest!

jaf01uk

Don't have much experience of 4x4 but do of driving turbos, build up the boost by getting the car moving slowly while bringing the revs up as you let the clutch bite more progressively (slip), you can do it on the clutch bite before you move but this would be more painfull on the clutch, sorry if that makes no sense but it's very hard to explain (easier to demonstrate!)

LG John

I think wolfman said it best in Topgun "*cough* Bullsh1t"

I can't understand how you could ever lose if you had a car that could do 0-30 in less than 0.5 seconds given that EVO's take about 1.8

I assume you mean, 'it feels like you have less than 0.5 seconds'

scooby_xt_turbo

well said, Saxo Boy

rich uk300

i supose that if you revs are at 6000 then dropping the clutch it wouldn't take too long before you have to change into second

LG John

Your right it doesn't - about 2 seconds. The fact that your chucked into you seat and the sheer thrill of it makes it feel a lot faster. Anyone know what sort of G's you'd pull if you did 0-30 in half a second?

I suppose you could do it if you launched off a cliff

rich uk300

wonder what g's the real drag racers pull....they cross the 1/4 mile line in about 4secs?

LG John

4 secs. Nice

Trout...

Recently - when testing back up car at a drag meet - I found that dumping it at 7,000rpm was the only way to beat loss of boost and break traction to get strong getaway!

In my own car - 6,000rpm - enables wheels to break traction and so turbo does not fall off boost. Even in the dry in my car it is possible to do this and be stationary with all wheels spinning - did it with Bobbie and mate in car!

Trout

LG John

Trout - how the hell are you running that kind of power with a 'weenie' turbo which IMO can only be a TDO4L???

Sprint Chief

0-30mph in 0.5 seconds is about 3g's - unlikely to be achieved without lots of bhp and some very special tyres!

"Proper" dragsters will do 0-100mph in something under a second (I've heard around 0.8 secs quoted) which is about 5g to 6g constant, although launch probably gets close to 10g instantaneous. The average over the rest of the run would probably be around 3g.

Oh and if my calcs are right they hit 100mph about 50 feet after leaving the start line

TheScooby

Those guys in America with those "Funny" cars are just nuts. Sprint Chief, you seem to know quite a bit about the American Drag racing; Do you know if any of them have gone under 4 seconds for the 1/4? Last time i watched ESPN they were at 4.105 or something ridiculous...

Oh, and Edcase; Whatever mood you are in at the time i guess

TheScooby

K9VYN [Kevin W]

Ok, heres a question for ya! My car (MY95 WRX) used to launch in wet or dry conditions with high revs and dropped clutch without wheelspin. This resulted in a 2nd gear shift being required almost immediately after launch.

Since fitting a UK spec box and rear diff, I seem to wheelspin from launch at less revs (wet or dry). Why is that? I assume its the mating of Jap spec engine with UK spec box and rear diff. Is this correct? Is there nothing I can do about it but switch back to all Jap transmission?

I find that slightly slipping the clust with medium and building revs now seems to be the quickest wat to launch the car.

Kev

LG John

3g in a car Imagine taking your gran in that

Are you sure this isn't the clutch slipping. In my car if I dial up full revs and drop the clutch the car will move forward slowly and the revs will go back to the red line very quickly. In other words the clutch slips and the car goes nowhere When you get it right and the clutch bits is city.

Katana

Saxo, you do know how to read torque and power curves right?

Barge. That thing scares me btw.

[Edited by Katana - 11/27/2002 11:30:13 AM]

TaviaRS

Saxoboy, imagine the sort of fuel surge you'd get pulling those sort of Gs, even in a straight line!

LG John

Power or Torque nothing....your scooby still won't do 0-30 in 0.5 secs without cliff assistance

Katana

What gearing are you using anyway? Its either that or your car is waaaaaay too slow.