Ratios for track day
 

What would be a good set of gear ratios for track days? Looking at Sepang international race track in Malaysia.

Purely for track driven car? 4 or 5-speed? VW box?

My 5-speed trans will get these ratios with about 640mm height tires ( 265/35R18).

Speed it at 3000rpm wit 4.13 r+p

1. 3.44= 25.5 km/h

2. 1.93 = 45.5 km/h

3. 1.3 = 67.7 km/h

4. 1.00 = 88 km/h

5. 0.77 = 114.2 km/h

But this is too long for track, i would chosen for track only with a quick think: 1st 3.44, 2nd 2.06, 3rd 1.48, 4th 1.21, 5th 1.00.

I would suggest shorter ratios, so that top speed would around 200-215Km/h, it would give better acceleration.

Thanks Alex for your reply, its for occasional normal driving and mainly to see track action. Looking at 4 speed but 5 speed is an option. Dont know if berg still produces their 5 speed.

Berg have still 5-speed kits available for type 1, maybe type 2 too.

For a type 1 trackday only transaxle i would choose these ratios:

3.88 r+p

1st 3.78

2nd 2.25

3rd 1.65

4th 1.26

5th 1.04 or 1.00



trackday and street transaxle maybe these



3.88 r+p

1st 3.78

2nd 2.06

3rd 1.48

4th 1.14

5th 0.93

And autobahn ratios here what i would choose



3.88 r+p

1st 3.78

2nd 2.06

3rd 1.42

4th 1.04

5th 0.82



Four speed with 3.88 r+p and stock 1-2 gear ratios, only 3 and 4 ratios would be needed to change, maybe 3rd between 1.40-1.48 and 4th between 1.00 - 1.12. Depends about the engine max rpm and torque.

Thanks Alex, most likely go with the 5 speed part track and road.

That depends on your speeds: are you under 80MPH? My 'best' track (hillclimb) box is a 3.8 box with a lowered 3rd gear. However, it's a long step up to 4th gear...

I think getting to 180km/h would be quite fast, on stock 03 box now.
its a T4 2666, 332 sch cam.
A friend of mine in a 997 turbo reached 250km/h on the longest straight at Sepang race track before slowing for the corner.
I know I cant reach that but would try to get the most out of the gearbox.

yeah 250km/h in a Porsche is easy, we all do that, but what do you need your Bug to do? Sorry, not sure what Sepang track is: Hill climb? Quarter mile? Low-speed twisty corners?

Sepang international race track, one of the F1 race track in Malaysia. Nothing here in Singapore, so most car enthusiast drive up.

That engine lives from torque,you wouldn´t be happy with a short ratio box imho.Much different than most type 1s.Sepang is a very fast track,you will lose time with a short box.
If a 5 speed is what you want I would go with a 915/03 box ratios:
1.) 3,181
2.) 1,833
3.) 1,261
4.) 0,961
5.) 0,758
R+P: 4,42

You could go with a 245/30 18 tire and be plenty fast enough to leave the Porsches behind you.

As a 4 speed a stock ratio trans with 3.44 R+P works really well on the track.The Rancho pro street 3.88 and 0.89 4th works really well also.

Thanks for the input 70Turbobug, yes Sepang is a fast track, would be nice to leave them behind :).
Today is the F1 practice session in Singapore, the night race! Sunday race day.

70Turbobug, that mention of a 3.44 R&P is interesting (and sensible),that would be strong but would require big power to work :)

With a 2.6L Type 4 he should have enough power and torque.

Oh yes indeed!