Top speed vs AutoX TRANNY on 430bhp turboed ITR

I don' t know what to do.

I droved on the Autobahn for a Topspeed run with 4 people in the car (including me) and I maxed out at 265 kph indicated. From 200 - 265 it was such a RUSH, it took about 10 seconds I guess. This was with 1.2 Bar of boost, 608 mm tire diameter and 8800 revs (cut off)

Tranny is stock (we have JDM 4.785 final drive)

I can convert to USDM final drive (I have it at home already) to get a top speed for about 290 kph. But I will lose about 300 rpms for AutoX, which is not so good I think (for turbo lag).

I can convert to LS 5th gear for Top speed about 295, but this cost again money.

Perhaps converting to a larger finaldrive is better, cause I can get more power to the ground and therefore acceleration is better, or at least it is not bader than with a shorter fd.

Perhaps I can convert some rpms for AutoX with smaller tire diameter. And rise the redline about 300rpms to get some speed back again for the straights on autoX.

Perhaps a larger fd is also better for DRAG racing, cause of the better traction?

PS: A 6 gear tranny would be nicer.

 

I would keep the quick gearing so You would have acceleration but what do I know. I like High speed runs but it seems your moving fast allready

btw could someone translate the kmh in mph please

 

295 kph on the autobahn is considered slow rob

 

1 mph is 1.605 kph

I woiuld say everything below 250 kph is slow in Germany, realy fast gets started above 270. Your hands are wet then.


[Modified by austrian type-R, 7:55 PM 7/10/2002]