Thinking of putting together an IS-F to autocross in the SCCA's "Street Touring X" class, which is for 4-seat cars up to 5 liters. Evos, STIs, and M3s happen to be excluded.
Had a couple questions maybe the experts here can help with-
1. How much front tire can these things fit? We are limited by the rules to 9" wide wheels, and 265mm tires. I know in the rear that won't be a problem, and I've seen people with 9" wheels up front, but don't know the widest tire I can fit. The car would be lowered, with a bunch (probably 2.5 degrees or more) of static negative camber. We are allowed to roll fender lips, but cannot flare the fenders. It would be awesome if I could find a way to fit 265's. Wheels will probably be custom 3-piece so assume offset could be made perfect.
2. What sort of power are these things making with I/H/E and a tune? I've seen some threads on these parts but they never seem to go anywhere. Whoever's got a link to a I/H/E/tuned IS-F dyno will be my buddy!!
Thanks for the help everyone!! I ran an IS300 nationally back in 2005, was a lot of fun, would love to whoop up on 'em with double the horsepower!!
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i can't suggest much specific answers to your question, but a few of us (read the car chat) actually think a tuned is350 is much better for autox purposes. the isf is heavy. on autox i never felt the car being very balanced
interesting that the evo, sti, and m3s are excluded?
Yes, I drove it. The great feeling of boiling blood.
I too don't think it would be a very good autocross car. To heavy. The biggest you can get on the 9" wheel is 245. Intakes, a few exist and make around 12hp. To my knowledge there are no commercially available headers yet, there are only one-offs and prototypes. It's also an engine out install. Exhausts, there are a few nice ones out there. Tune? well not really, no one has cracked the Lexus/toyota ECU on these. The care is heavy and definitely a luxury car, you would have to pull out a lot of things that make this car nice to get it to fighting weight. (interior, sound proofing insulation, navigation, etc. etc.)
Agreed, it's probably better suited to the track where it can stretch its legs a bit. Still, the gearing is great for autocross and its competition (3-series E36 BMW, 2.0 WRX, and RX-8) are all quite underpowered, though substantially lighter. I think if I can squeeze some 265's up front, I can maybe make it work. Will look for a non-sunroof car too.
I spoke with some guys from OS Giken yesterday at the San Diego National Tour about the IS-F. They mentioned they were sponsoring a track/time attack car - is that yours? Have you been happy with the Giken in your IS-F? What sort of times have you been able to put down at local tracks, if you don't mind my asking? I used to do a lot of track stuff with my S2000 way back in the day, wouldn't mind getting back out there with the IS.