Yeah, last year I was running 245F/275R 18's like Ry, but this year 255 17's front and rear per 2006 rules for 2.2 without adding 100 lb ballast. The 255-17 is about the same width as the 245-18 in front, though taller sidewall, but the 275-18 is meaningfully wider than the 255-17 in rear. I was about a second slower this year at Willlow, though faulty since not a head to head comparison. The difference got increasingly worse over the length of a 20-30 min race as the tires lose grip. Time trials wouldn't be as disadvantageous.

 

That's impressive for a NA car.

 

Its nothing anyone else couldn't do. Of course its not smog legal but most mods kill that.

 

suprising you didnt lose any on the low end with the 3inch.

 

Why would I? Back pressure is an urban myth.

We've already had this arguement here. I went with 3" because my options were 2.5" or 3". had I had the option of 2.75" I would have for weight savings.

 

Yeah I think it was me whos was curious about this last time

Hey Ry, what belt did you use to remove the ac?

Other then weight do you feel it made a difference?

Thanks
Randy

 

Was this with stock pistons? I always thought you would run into valve clearance with stock pistons and toda c cams? Peak power output isn't as high as you'd expect, but look at that huge midrange gain! Should help quite a bit exiting corners.

 

yes everything else was stock incl pistons. you can see the toda cams dip off them start to make more power at 9300, I think if I had the bottom end to support the rpms there would be more power up top.

and takara. 24.5" 6 rib, some use 24" too but 24.5 keeps the tensioner with its normal range. I'm pretty sure the exact part numbers are listed in a faq in the uth forum

 

[QUOTE=krazik,Dec 18 2006, 06:05 PM] yes everything else was stock incl pistons.

 

shit! 45.5 or 45.0 not 24 LOL brain fart.