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Discussion Starter #1
I've been doing high speed driving events at Road Atlanta for the last several years. I'm in the process of selling my current track car and plan to modify my 2006 IS350 (sport Package) to give it better cornering and braking ability on a road course. It will no longer be a daily driver.

I have an extended warranty and must stay within the confines of allowable modifications that will not void the warranty.

I don't plan to spend money on go fast items bc the ROI is a pitiful amount of power/dollar. With the car I'm selling, if more power were needed, one would just buy a couple of larger turbos and make the other necessary mods to accommodate them. Large power gains were possible for reasonable amounts of dollars..

My thoughts at present are to install the F-Sport shocks and keep the linear rate springs already on the car. Front and rear anti-roll bars evidently used to be on the list of F-Sport mods for the 2IS cars but I don't see them currently listed. I do see them available online from various companies so that would certainly be another modification I will plan. I've just purchased some Michelin Pilot SS tires. I will be flushing my brake system fluid and replacing with Castrol SRF bc I already have an adequate reserve supply.

What rotor/pad combination will give the best track performance? I'm not sure 6-pot fronts are really necessary. I just want some combination that will not fade after 20 minutes running in hard in a session. l know 6 pot calipers with larger rotors will dissipate more heat but the limiting factor is always the adhesion of the tires.

The main thrust of my post is to learn what parts from the ISF will fit my car and increase cornering performance. If there's an existing thread that explains, please direct me---I couldn't find one.

thanks in advance for your help.

Al
 

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As far as warranties go the warranty company, be it lexus or 3rd party, can only deny claims if they can show they were caused by your modification. So if you put coilovers on and immediately blow your engine they wont be able to deny the warranty claim on the engine, etc. Now breaking something while racing on a track is a completely different story in general. I dont know of any warranty company that would cover mechanical damage that was the result of racing.
 

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Discussion Starter #3
Thanks for your response. I don't want to take the chance with any after-market parts. I want to add only parts sold through Lexus dealers or things like anti-roll bars which are F-sport but no longer listed as options for the 2is.

A HPDE is not a race. My policy only excludes racing and timed events neither of which apply to a driver education event.

I know there's a lot more that could be done to improve handling like lowering, adding negative camber, etc which could be accomplished with the coilovers. Solid bushings, strut and other bracing, etc. I had 3-way adjustable Motons (plus numerous other mods) on my current vehicle so I know I'm going to be limited by only using Lexus parts.
 
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