Some interesting mods on this ACR

[Arizona Vipers]

The car was built for club track days, primarily at Fontana Speedway. The modifications were done to make the client more comfortable in the car and manage tire wear, which was a big issue with the Kuhmo's at this venue and Willow Springs. As a novice driver, his laps times were always with the top of the group and the suspension made the car more predictable.

The changes to the driveline mostly came about because of an issue with the transmission, not going into reverse. Donato did his standard race prep upgrades to the transmission and the fluid was changed from ATF to gear lubricant. The production clutch was modified and the LSD upgraded to the gear driven type which really improved traction out of the corners.

Going to 18 inch wheels and R7 Hoosier tires was simply to manage tire wear. The Kuhmo's were faster but would only last about 3 sessions at Fontana (even with an asymmetrical alignment). The end result was a combination that would allow the tires to last an entire weekend. The new Viper is a very heavy car, that and the Aero Package make it very hard to manage tires. In fact the R7 tires are near the load limit.

The car was fitted with the proper safety items and track aides. Ross Murray rollbar, Crow Belts, Fire extinguisher, Full Race Keeper camera, data system and in car lap timer.

The brakes are factory carbon, with only upgraded lines and fluid. The custom CCW wheels have adequate caliper clearance but race rubber from the track needs to be cleaned form the wheel barrels every weekend or it rubs on the calipers.

We made numerous changes to address heat from the exhaust with headers and Arrow calibration, end result was no heat heat issues what so ever. Power was super consistent with the bolt on package.

The client decided to move on to a purpose built track only type car.

Please PM me directly if you have further questions.

Great build Dan! Love to see stuff like this.

[dmann]

The car was built for club track days, primarily at Fontana Speedway. The modifications were done to make the client more comfortable in the car and manage tire wear, which was a big issue with the Kuhmo's at this venue and Willow Springs. As a novice driver, his laps times were always with the top of the group and the suspension made the car more predictable.

The changes to the driveline mostly came about because of an issue with the transmission, not going into reverse. Donato did his standard race prep upgrades to the transmission and the fluid was changed from ATF to gear lubricant. The production clutch was modified and the LSD upgraded to the gear driven type which really improved traction out of the corners.

Going to 18 inch wheels and R7 Hoosier tires was simply to manage tire wear. The Kuhmo's were faster but would only last about 3 sessions at Fontana (even with an asymmetrical alignment). The end result was a combination that would allow the tires to last an entire weekend. The new Viper is a very heavy car, that and the Aero Package make it very hard to manage tires. In fact the R7 tires are near the load limit.

The car was fitted with the proper safety items and track aides. Ross Murray rollbar, Crow Belts, Fire extinguisher, Full Race Keeper camera, data system and in car lap timer.

The brakes are factory carbon, with only upgraded lines and fluid. The custom CCW wheels have adequate caliper clearance but race rubber from the track needs to be cleaned form the wheel barrels every weekend or it rubs on the calipers.

We made numerous changes to address heat from the exhaust with headers and Arrow calibration, end result was no heat heat issues what so ever. Power was super consistent with the bolt on package.

The client decided to move on to a purpose built track only type car.

Please PM me directly if you have further questions.

Cool build for sure. i like reading about these type setups and thanks for sharing!

[serpent]

Dan Cragin,

Do you know if he went to one of the porsche clubsport cars, or a Radical or maybe even a Stohr WF1? Also do you come up to Laguna or Sonoma to test your race cars?


I wonder if shaving a little bit off the caliper since it's so close to the wheel will negate having to clean the wheels after every track day?

[Dan Cragin]

He was looking at the new Radical's, last I checked.

I do go to Sonoma to run a vintage USAC car we built. Our club does run Laguna at times on the no noise limit days. I try to make those.

I would not modify any wheel, to much liability.

Feel free to contact me anytime.

[ViperDC]

amazing that some of these mods are available but never been mentioned on the forums.

People seem to be concerned about how much other people think their car is worth or if their stripe package will clash with their custom limited edition latte cup.

lol

[ViperPete]

This is a cool thread.