High speed RR setup

[Poloturbo]

This year I will compete in solo1 in Quebec, with laps club (laps.ca) Regional racing but fun...

Multiples events wtih some high speed tracks like Sanair, Shannonville, Mosport, Cabalogie, maybe Tremblant. And also more slow corners speed aka St-Eustache and else.

It is only my second year and I don't want to kill myself either so my question is:

Regarding high speed corners, alias Tremblant and else, want kind of setup would you recommend. More towards a bit of understeer or else? The car behave with understeer at the small St-eu. track and seems SAFER than a big oversteering car.
With lots of big high speed corners an caroussel, I don't want the car to oversteer too much to a point where it could snap an have some issues.

The only guy I spoke just a bit was Scott from NH who runs some Porsche events at the big tracks I mentionned.

My setup: Konis sports, GC, 450f/350r, stock sways, stock bushings, 17" rotas, Pirelli Corsa 235-45-17, -2.5 front and rear camber setting. It seems a bit UNSERIOUS but I remind you that this is a learning process and a wahnt your input before sways and else.

The RMDSM seems a bit big for autocross but are they perfect for RR.? ANY input would be appreciated.

Paul

 

[MNGSX]

I'd look at

RRE sways
ES Bushings

 

[Poloturbo]

RRE sways are about 24mm for the back. Wouldn't that set the car for oversteering problems? The RM are 20.6 front, 20.6 rear. Stock are 19 front, 18 rear...

Would you set-up more with springs or sways for my purpose?

 

[Jeff_Jeske]

Do you have race tires? Thats the biggest advantage out on the track!

You could always get stiffer springs from GC or hypercoil....they are fairly cheap.

My guess is that you will want more OVERSTEER than under. I would leave the front sway bar alone and add the RRE rear sway bar.

A rear strut tower bar could help as well especially if you have a moon roof.

Jeff Jeske

 

[Poloturbo]

Do you have race tires? Thats the biggest advantage out on the track!

You could always get stiffer springs from GC or hypercoil....they are fairly cheap.

My guess is that you will want more OVERSTEER than under. I would leave the front sway bar alone and add the RRE rear sway bar.

A rear strut tower bar could help as well especially if you have a moon roof.

Jeff Jeske

Yes race R compound tires, Pirelli Corsas. I want neutral handling, even slightly understeer.
I think I'm gooing to go with RMDSM front-rear, Prothane bushings and ajust my rear tires to taste and see how it goes.

Does'nt seems to have lots of guys on those tracks...

 

[paul s]

I have been lapping at Shannonville several times, at best on the long stretch you will hit close to 125mph(200km) with some major mods, maybe little more if you are willing to go very deep into the corner. I have E/S suspension bushings, G/C 500/350, koni sport, RM sways, braces. I always use my street tires 235/40/18 and have lots of fun...

 

[Poloturbo]

I have been lapping at Shannonville several times, at best on the long stretch you will hit close to 125mph(200km) with some major mods, maybe little more if you are willing to go very deep into the corner. I have E/S suspension bushings, G/C 500/350, koni sport, RM sways, braces. I always use my street tires 235/40/18 and have lots of fun...

Thank for your input. How's the car with high speed turns? Neutral, more towards understeer, oversteer? How about 500 front how do they compare to 450?
What's your settings on the konis, a quarter turn before full stiff on the four of them or a bit less outback.

 

[Jeff_Jeske]

Why do you want to plow?

 

[Poloturbo]

Why do you want to plow?

Sorry but I don't understand "plow"

 

[Jeff_Jeske]

I want neutral handling, even slightly understeer.

Understeer...when you turn the wheel and the car keeps going straight out of control AKA plowing.

Everyone I know that races including myself want oversteer before understeer.

You can throttle out of oversteer as well as use it to fling the car around the turn....AKA drifting.

 

[Poloturbo]

Understeer...when you turn the wheel and the car keeps going straight out of control AKA plowing.

Everyone I know that races including myself want oversteer before understeer.

You can throttle out of oversteer as well as use it to fling the car around the turn....AKA drifting.

I don't know if it's the best setup with more oversteer but ins't that more SLIGHTLY more towards understeer for RR racing. With very high sped corners in the caroussel at a near track, the TSiAWD of my friend was oversteering an spinning in the turn. Usally more on wet conditions. With no sways and street tires, my car was the fastest, slight understeer but great balance and confidence even in thoses turns.

I'm going to quote DG when he said:" So then, I would expect a properly set up road racing DSM to be biased more towards UNDERSTEER than an autox car."

So can we definemore understeer than an auto_X car? what would be the difference and setup as more towards???

 

[paul s]

I usuall run about 1/4 turn from stiff front and back, just play with the tire pressure. also consider the allignment settings..

 

[NDgsx]

In my experience (which really pertains to 1Gs and E36 bmws) cars setup to handle neutral or with a slight tendency toward oversteer at low speeds will go more towards understeer at high speeds.
As funny as it may sound what about just adding a rear wing and playing with the angle of attack to get the desired high speed balance? Before they were on the back of every honda race cars used to actually use wings for silly things like downforce and high speed balance . It does work, ask Leon Reitman.

On another note what brakes do you have? If you haven't replaced them get a set of 13" TCEs or stoptechs. You'll quickly find out that replacing the stock rotors every other track day makes the big kit suddenly not look so expensive. I wasted a lot of money on stock rotors and porterfield R4s before getting smart.

 

[Poloturbo]

I didn't have enough to go Stoptech or Wilwood but I will have the same as the Baer kit up front with 13"X1.1 rotors. Should be better than powerslot I burned in 2 month last year, with better thermal capacity.

I will put the RMDSM bars for now and see how it goes with the R tires this year.

 

[NDgsx]

That will get the job done then as far as heat.