Larry96815

Just curious, when leaving your IS 350 in drive to race, what gear and RPM do you cross the finish line?

Aloha,
Larry

Gernby

iTrader: (1)

I can't think of a situation where it wouldn't be in 4th gear at the 1/4 mile line, but the RPM is totally dependent on the size of the rear tires, and power. For me, I'm at about 5900 RPMs (105 MPH).

Gernby

iTrader: (1)

It would also be dependent on the gearing if we had any gearing options for our car.

Larry96815

I understand all that. I believe ideal would cross the finish line in 4th gear at redline. I was wondering if a smaller tire may actually be bad because you may shift into 5th gear before the finish line which is not wanted. 5900 rpms would tell me that a smaller tire could be used without worrying about going into 5th gear. Thanks guys.

Actually I don't know why I am worried, we don't even have a race track here anymore.

Aloha

Gernby

iTrader: (1)

The run that I did was with a VERY low profile R compound tire that is 6.5% smaller than stock. With the stock tire, 4th gear goes past 120 MPH.