Got a track related question? I'll try to answer.

[EAGLE5]

Originally Posted by Deep Six

Someone help me understand how PSS's work so well on GTR's. I have two friends that use them on their highly modified street legal cars for dual duty. They came in first and second at the NARRA time trials at Sebring in the TTU class with 2:16 laps. Two months later one of them is running 1:14's at Roebling on the same set!

Is there a tire that they don't run fast on?

[OkieSnuffBox]

Originally Posted by Deep Six

Someone help me understand how PSS's work so well on GTR's. I have two friends that use them on their highly modified street legal cars for dual duty. They came in first and second at the NARRA time trials at Sebring in the TTU class with 2:16 laps. Two months later one of them is running 1:14's at Roebling on the same set!

Computer wizardry.

[troek]

my friend tracks his r35, and from what he says, running slicks puts alot of extra strain on the drive train, and leads to premature failures, so alot of people stick to street tires. he sticks with the OEM dunlops and puts down very competitive times. those cars are just amazing.

[CSG David]

Originally Posted by troek

my friend tracks his r35, and from what he says, running slicks puts alot of extra strain on the drive train, and leads to premature failures, so alot of people stick to street tires. he sticks with the OEM dunlops and puts down very competitive times. those cars are just amazing.

Those R35s have monster consummable costs. Fresh R888 or Dunlops lasts for 2 sessions max at one of the big tracks we attend. Cording usually happens after the 2nd session.

[troek]

yeah, he upgraded to CCM rotors, and went through his first set of pads in about 90 mins of track time. we're hoping that the pads were just not track friendly. he got em though a hook up right before his leg in a 7 hour endurance race, and didnt know the specs of the pads.

[Dominus]

Any Tips for Dialing in a suspension for maximum grip?

I've tried testing a turn local to me (probably a 30* turn) and cant seem to decide on a proper street/track setting.

FYI i have dampening adjustable BC BR coilovers and was testing with 245/45/17 handcook ventus v12evo tires at the OEM alignment.

thanks in advance.

[CSG Mike]

Originally Posted by Dominus

Any Tips for Dialing in a suspension for maximum grip?

I've tried testing a turn local to me (probably a 30* turn) and cant seem to decide on a proper street/track setting.

FYI i have dampening adjustable BC BR coilovers and was testing with 245/45/17 handcook ventus v12evo tires at the OEM alignment.

thanks in advance.

The real answer would be to get a set of dampers designed for cornering grip.

As for dialing them: http://www.penskeshocks.com/assets/T...29%2008-10.pdf

[Dominus]

Originally Posted by CSG Mike

The real answer would be to get a set of dampers designed for cornering grip.

As for dialing them: http://www.penskeshocks.com/assets/T...29%2008-10.pdf

Sorry i guess i wasnt clear enough on my question. i undersand that these are not high quality coils and I'm not setting up to break track records by any means. i would just like to get the best out of my current setup.

based on my limited knowledge i realize that i can set the dampening screw from soft to hard and this effects my ride comfort. i realize that softening the front or stiffening the back should reduce understeer. what i am asking is a basic understanding on what i should prioritize on adjusting (front/back). im merely looking for a direction in which to start the tuning process.

The questions circling me now are if i can keep the front semi soft but suppliment it with a strut brace to prevent body flex/roll or should i focus on leaving them stiff and adjusting camber/toe or are any of these adjustments only going to make a minor difference with my current setup?

again, thanks for any guidance.

[CSG Mike]

Originally Posted by Dominus

Sorry i guess i wasnt clear enough on my question. i undersand that these are not high quality coils and I'm not setting up to break track records by any means. i would just like to get the best out of my current setup.

based on my limited knowledge i realize that i can set the dampening screw from soft to hard and this effects my ride comfort. i realize that softening the front or stiffening the back should reduce understeer. what i am asking is a basic understanding on what i should prioritize on adjusting (front/back). im merely looking for a direction in which to start the tuning process.

The questions circling me now are if i can keep the front semi soft but suppliment it with a strut brace to prevent body flex/roll or should i focus on leaving them stiff and adjusting camber/toe or are any of these adjustments only going to make a minor difference with my current setup?

again, thanks for any guidance.

Damping does not determine under or oversteer. That is determined by your spring/sway balance. Damping affects how quickly your wheels are allowed to move by the suspension. Underdamping causes sub-par response, while overdamping causes wheel hop.

I highly suggest you read the penske manual I linked, under the tuning section.

[OkieSnuffBox]

Originally Posted by CSG David

Those R35s have monster consummable costs. Fresh R888 or Dunlops lasts for 2 sessions max at one of the big tracks we attend. Cording usually happens after the 2nd session.

That seems a bit exaggerated considering they will do OLOA (One Lap of America) on one set of street tires.


And that equals out to roughly 4 full track sessions and ~2500-3000 street miles.

[Sleepless]

Originally Posted by OkieSnuffBox

That seems a bit exaggerated considering they will do OLOA (One Lap of America) on one set of street tires.


And that equals out to roughly 4 full track sessions and ~2500-3000 street miles.

I'm going to guess that the OneLap guys have better suspension setup/alignment than the person that runs thru as set of tires in 2 sessions in GTR. I'd say anyone going through a set of tires in two sessions isn't driving the car optimally nor is the car setup optimally.

[CSG David]

Originally Posted by Sleepless

I'm going to guess that the OneLap guys have better suspension setup/alignment than the person that runs thru as set of tires in 2 sessions in GTR. I'd say anyone going through a set of tires in two sessions isn't driving the car optimally nor is the car setup optimally.

That particular big track we talk about chews up tires quite well. While the alignment isn't exactly completely optimized, it's much different from stock. What separates the fast guys to the slow guys is how fast the tire consumption is on that particular big track. The time difference is actually significant which is why a lot of the R35 guys get butthurt when they're told they're not driving fast enough.

[CSG Mike]

Originally Posted by Sleepless

I'm going to guess that the OneLap guys have better suspension setup/alignment than the person that runs thru as set of tires in 2 sessions in GTR. I'd say anyone going through a set of tires in two sessions isn't driving the car optimally nor is the car setup optimally.

This isn't just one isolated person... it's every GTR owner we know that is at an intermediate level or higher.

[troek]

yeah our cars are pretty easy on tires compared to an r35. btw, what does a track session in the states consist of, time on track wise? tracks over here have 20-40 minute sessions and you just pay per session, so a track day could be 20 mins on tsukba, or a couple hours.