ZR1 Power to the ground issue.

[Dands]

Guys, I have a fully spec's RM ZR1. I use the default PS3 controller and I have trouble putting all those 905 bhp to the ground. On what I see as a simple corner I'm losing the back end all the time on exit.

I have Race softs and still I'm over powering them with virtually low throttle.

I'm using a well known tune but still have the issue. Any tips or areas to look other than even more throttle control?

 

[BlueShift]

If you don't post the setup or links to the setup you're using, nobody will know how to help you man

 

[oppositelock]

Which tune are you using? I've seen some popular tunes that utilize rear toe-out, which I dislike for this exact reason.

 

[Adrenaline]

Guys, I have a fully spec's RM ZR1. I use the default PS3 controller and I have trouble putting all those 905 bhp to the ground. On what I see as a simple corner I'm losing the back end all the time on exit.

I have Race softs and still I'm over powering them with virtually low throttle.

I'm using a well known tune but still have the issue. Any tips or areas to look other than even more throttle control?

What well known tune are you referring to?
My first guess, it go into your LSD settings. Cut your Acceleration setting in half. If it's 40, cut it to 20.

If that doesn't work, you can swap the whole thing to:
Init: 5
Accel: 10
Deaccel: 25 and let us know where you're at.

 

[Leonidae@MFT]

It's not LSD... it's probably his rear suspension values.take a look at the Corvettes posted on Mad FinnTuners for clues.

 

[Adrenaline]

It's not LSD... it's probably his rear suspension values.take a look at the Corvettes posted on Mad FinnTuners for clues.

The 2 best known Corvette tunes, are RKM and Avid. Possibly Sail IC's.
RKM uses a lower rear spring rate than Mad Finntuners, which contradicts your logic, and Avid's tune is great, as long as you adjust the LSD as proven by multiple reviews.

Even Mad FinnTuners LSD settings are considerably lower than Avid's, which further points to an issue with LSD, not rear spring value.

 

[Leonidae@MFT]

It's not the spring rate but shocks that keep the tire on the road..

 

[Adrenaline]

It's not the spring rate but shocks that keep the tire on the road..

I'm willing to bet, that even if he uses your entire suspension set up, with Avid's LSD settings, he still won't get traction.

 

[Leonidae@MFT]

Which means that there's too much torque for those tires as well. Full power isn't always the ideal solution to everything. Also, the used gearing has an effect to traction, not o mention which gear he is on..

 

[Adrenaline]

Which means that there's too much torque for those tires as well.

If only there was a way, to adjust the amount of torque that activated the limited slip differential in the rear end... Oh wait...

 

[Greycap]

No LSD will help when there's enough torque to spin both wheels. Fact. And in this case there certainly is.

 

[Dands]

Sorry guys. I'm using Vette's Tune.

Chevrolet Corvette ZR1 (C6) RM '09
HP: 905
Curb Mass: 1100 kg
Weight Distribution: 52 / 48


Aerodynamics: 34 / 46
Transmission: 360
Initial Torque: 22
Acceleration Sensitivity: 40
Braking Sensitivity: 34
Ride Height: 1 / 1
Spring Rate: 16.5 / 15.1 (Racing Soft)
Extension: 9 / 9
Damperes: 8 / 8
Anti-roll Bars: 4 / 6
Camber: 2.8 / 2.3
Toe: -0.13 / -0.06
Brake Balance: 7 / 4

Transmission set to 360 KPH. I've tried 380 and 390 just to make the gearing taller.

Sound funny, but I'm losing the back like I'm driving on ice. I don't seem to have any tyre friction resistance. I'm driving as smoothly as possible trying not to unbalance the car.

Also can you over heat the tyres?

Really appreciate any help. As I say I'm only A-Spec level 19 doing the last two events against LM cars and I'm just not getting the business done.

 

[Corthalis]

Sounds like it's a driver problem. Any car that makes that kind of power is going to need good throttle control regardless of the tune. May also want to lower the LSD and soften rear suspension.

 

[Adrenaline]

Sorry guys. I'm using Vette's Tune.

Chevrolet Corvette ZR1 (C6) RM '09
HP: 905
Curb Mass: 1100 kg
Weight Distribution: 52 / 48


Aerodynamics: 34 / 46
Transmission: 360
Initial Torque: 22
Acceleration Sensitivity: 40
Braking Sensitivity: 34
Ride Height: 1 / 1
Spring Rate: 16.5 / 15.1 (Racing Soft)
Extension: 9 / 9
Damperes: 8 / 8
Anti-roll Bars: 4 / 6
Camber: 2.8 / 2.3
Toe: -0.13 / -0.06
Brake Balance: 7 / 4

Transmission set to 360 KPH. I've tried 380 and 390 just to make the gearing taller.

Sound funny, but I'm losing the back like I'm driving on ice. I don't seem to have any tyre friction resistance. I'm driving as smoothly as possible trying not to unbalance the car.

Also can you over heat the tyres?

Really appreciate any help. As I say I'm only A-Spec level 19 doing the last two events against LM cars and I'm just not getting the business done.

Like I said... Change the LSD settings, let us know how it works out.

 

[oppositelock]

Anti-roll Bars: 4 / 6

Even that out. Maybe even reverse it.

Toe: -0.13 / -0.06

Am I psychic or what? Lulz.

 

[BlueShift]

Compression < extention...
It will be slower to dive than to come back. Normally it should be the opposite to diffuse energy braking/accel slower from the road/curve to the car. This will makes you feel any bump in the road and make infinite car oscillation to bumps in the road.
It's a very bad thing but since the manual's typo say it's good, then people say it's good...

Also LSD may be set too high for your traction camber (2-3° start to be HUGE).

For a road setup, I wouldn't put more than 14kg on this car (by memory). Try 14/12.8...

 

[Leonidae@MFT]

Good luck if you hit rumble strips with that.. Also, if you want less aggressive turn-in (which also helps causing wheelspin), try reversing those toe values.. -0.06 in front and -0.13 in the back.

 

[udontneed2know2]

I've tuned the Shelby to fix this very problem so here is what I usually do.

LSD set all the way down with very low acceleration sensativity. This will limit the power to the rear wheels a bit.

Then lower the height of the car and increase the suspension spring rates, especially in the back. Doing so will limit further the power to the rear wheels. Main thing though is to throw alot of negative camber into the rear wheels. Doing so will throw your tires a little off the course on the straights and you wont get so much traction. Doing all these made my shelby run the course like a lambo. You still have to be careful though with how fast you accelerate. Putting full RPM's in gear 1 will still spin the tires alot. Also, up your roll rates too. This will stop the weight of the car from shifting too much on the turns. Mess with it a bit to find the right hot spot for that car. I did this too my Z06 as well and it worked wonders. Just dont do things too fast or you will understeer to the point of having to slow down alot more then you do drifting around turns. Main thing I wanted to do was just limit the amount of fishtailing going on with the outs of a turn. Seems to work with all cars.