Btcc geo setup and tyre pressures
Discussion
Long shot but does anyone know what geometry setup and tyre pressures the RWD BTCC guys use? I am running a 1500kg bmw M3 track car on the BTCC dunlop slicks and run 2.5 neg camber up front and neg 2 at the back with hot pressures of 30 psi. Just wondered if i can improve the setup?!?!
sydown said:
Long shot but does anyone know what geometry setup and tyre pressures the RWD BTCC guys use? I am running a 1500kg bmw M3 track car on the BTCC dunlop slicks and run 2.5 neg camber up front and neg 2 at the back with hot pressures of 30 psi. Just wondered if i can improve the setup?!?!
get some proper tyre info at track with someone like Tracktoys, they will tell you about and advise changes to tyre temps and pressuresmy guess is BTCC will be pretty irrelevant as totally different weight and power delivery but youll be looking at about -4 to -5 camber on front and -3 to -4 on rear
billyboysm3 said:
I run -4 up front and -2.5 at the rear but I never let the slicks go over 26 psi. For me that works best, I found anything over that they go off quicker.
I'll try 4 degrees at the front and 2.5 at the rear, 26psi seems a little low, talking to the guys from Michelin (I know they are dunlop tyres but dunlop weren't there at the weekend!) they said 2 bar which is 29psi. Don't the shoulders tend to wear more at 26psi? I take it you are running a similar weight with driver & fuel?Cheers
Bare in mind your slicks will probably be fooked if they have already been raced on.
Take tyre temps in 3 places across the tyre or get a friend to this when you get back to the pits (dont do a cool down lap for best results). This will help you learn what cambers and pressures to use.
Take tyre temps in 3 places across the tyre or get a friend to this when you get back to the pits (dont do a cool down lap for best results). This will help you learn what cambers and pressures to use.
TBH, I have been doing track days for over 10 years now & speaking to several e36 specialists & track day set-up type places over the years have come up with pretty much EXACTLY what you are currently running.
The more agressive guys go up to -3.5 front to -2 rear, but pretty much most will say around 2.5 to 3 front & 1.5 to 2 rear.
I use 2.5 front & 1.5 rear with 31 PSI front & 33 rear with 245s all round (hot) and have found it to be very neautral & stable, but with good crisp turn in.
The more agressive guys go up to -3.5 front to -2 rear, but pretty much most will say around 2.5 to 3 front & 1.5 to 2 rear.
I use 2.5 front & 1.5 rear with 31 PSI front & 33 rear with 245s all round (hot) and have found it to be very neautral & stable, but with good crisp turn in.
FTW said:
Bare in mind your slicks will probably be fooked if they have already been raced on.
Take tyre temps in 3 places across the tyre or get a friend to this when you get back to the pits (dont do a cool down lap for best results). This will help you learn what cambers and pressures to use.
thisTake tyre temps in 3 places across the tyre or get a friend to this when you get back to the pits (dont do a cool down lap for best results). This will help you learn what cambers and pressures to use.
andyiley said:
TBH, I have been doing track days for over 10 years now & speaking to several e36 specialists & track day set-up type places over the years have come up with pretty much EXACTLY what you are currently running.
The more agressive guys go up to -3.5 front to -2 rear, but pretty much most will say around 2.5 to 3 front & 1.5 to 2 rear.
I use 2.5 front & 1.5 rear with 31 PSI front & 33 rear with 245s all round (hot) and have found it to be very neautral & stable, but with good crisp turn in.
not necessarily this, slicks are race tyres and very rarely do road settings make good race settings , chances are if you are trailering the car you will not want to run camber as low as this. My guess is this post is talking about road legal track tyres which do not run geo anything like slicks.The more agressive guys go up to -3.5 front to -2 rear, but pretty much most will say around 2.5 to 3 front & 1.5 to 2 rear.
I use 2.5 front & 1.5 rear with 31 PSI front & 33 rear with 245s all round (hot) and have found it to be very neautral & stable, but with good crisp turn in.
shim said:
FTW said:
Bare in mind your slicks will probably be fooked if they have already been raced on.
Take tyre temps in 3 places across the tyre or get a friend to this when you get back to the pits (dont do a cool down lap for best results). This will help you learn what cambers and pressures to use.
thisTake tyre temps in 3 places across the tyre or get a friend to this when you get back to the pits (dont do a cool down lap for best results). This will help you learn what cambers and pressures to use.
Regarding camber, I would say the higher values you've been given are what you should use. Radial slicks can take a lot of camber and if you're on lowered suspension with standard wishbone geometry you will need still more static camber.
The best thing you can do it get a base set-up then spend a day testing your car to find what works best. A spike pyrometer is the best investment you can make when tuning the chassis.
Edited by CamMoreRon on Tuesday 16th September 10:14
shim said:
andyiley said:
TBH, I have been doing track days for over 10 years now & speaking to several e36 specialists & track day set-up type places over the years have come up with pretty much EXACTLY what you are currently running.
The more agressive guys go up to -3.5 front to -2 rear, but pretty much most will say around 2.5 to 3 front & 1.5 to 2 rear.
I use 2.5 front & 1.5 rear with 31 PSI front & 33 rear with 245s all round (hot) and have found it to be very neautral & stable, but with good crisp turn in.
not necessarily this, slicks are race tyres and very rarely do road settings make good race settings , chances are if you are trailering the car you will not want to run camber as low as this. My guess is this post is talking about road legal track tyres which do not run geo anything like slicks.The more agressive guys go up to -3.5 front to -2 rear, but pretty much most will say around 2.5 to 3 front & 1.5 to 2 rear.
I use 2.5 front & 1.5 rear with 31 PSI front & 33 rear with 245s all round (hot) and have found it to be very neautral & stable, but with good crisp turn in.
This is really only a track car now, only drive it to and from tracks so I'm not fussed if the settings are useless for the road, just want optimal track settings.
iguana said:
What the the btcc cars run is pretty irrelevant, vs a road car.
I run a 36 tracker, fairly softly set up vs many & I run a similar setting to above cars, 4 deg neg front, near perfect wear.
I run a 36 tracker, fairly softly set up vs many & I run a similar setting to above cars, 4 deg neg front, near perfect wear.
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