11.1s on 19" street tyres !!

[JP300+]

Originally Posted by CAT600

10.9 on semis is a great result. What 60' did you run and what diameter and brand were they?

I have run 11.30 in my manual TS50 with 19" R888 semis but everyone tells me that the sidewalls are too stiff for a good launch which is backed up by my 60's (1.94s) and then when I switched to ET Streets the 60' dropped to 1.75s and the ET to 10.78.

That tells me that even with the old rule of thumb of 1/10th at the 60' = 2/10th at the 1/4, the car must still be wheelspinning after the 60' and losing time (there was 0.34s difference to the 330' which is an increase)

I guess what I am trying to determine how much of the "losses" the semis have are based on sidewall stiffness and how much are due to compound.

Again, great result with the semis

Daniel

60' was 1.66s, wheelspun with some smoke off the line ! They are second hand M/T Et steets 27" diameter.

The car felt really strong at the top of 1st and through 2nd. I "sort of" backed off at 3/4 track and braked a bit early to try an avoid getting booted but was not lucky...

I've run a best of 1.78 on the Maxxis but now can avarage low to mif 1.8X 60's.

I was told that the car sounded like it was spinning in 1st and 2nd and then hooked up in 3rd.

I was also told that the burnout was too big?

Apparently you only need to turn the tyres a bit to clean them and get a little bit of heat. If they get too hot they do not work as good?

I'll put the extractors/exhaust manifold on, fix the wastegate (leaking too much needs a heavier spring, I think) and then get out there again.

It's all good fun !!