BTCC RWD Cambers ,anyone know what they run typically?
BTCC RWD Cambers ,anyone know what they run typically?
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Discussion

jellison

Original Poster:

12,803 posts

306 months

Monday 19th April 2010
quotequote all
I suppose only applies Beemers. Anyone know what they run typically front and rear?

GT Kodiak

2,907 posts

208 months

Monday 19th April 2010
quotequote all
From the looks of it about 3 degrees neg.

It's the FWD Saloons that have gone mad for it this year yikes they must be running circa eight degrees!!

Ahonen

5,032 posts

308 months

Monday 19th April 2010
quotequote all
Yes thanks.


T89 Callan

8,422 posts

222 months

Monday 19th April 2010
quotequote all
There will be a fairly big range dependent on the circuit.

3-5 degrees is likely the normal range that they likely work in (haven't run a BTCC car since 2006) but most other RWD race cars usually run in that range as well.

Scuffers

20,887 posts

303 months

Monday 19th April 2010
quotequote all
generically, Dunlop's need a st load of neg to get the best out of them, how much is car dependant, but 5+ is typical

jellison

Original Poster:

12,803 posts

306 months

Tuesday 20th April 2010
quotequote all
I am trying to work out if my car (ball part the same size as a smaller touring car and rwd, and about the same weight (tad less) and a bit less power 280 vs 230, needs its camber changing.

I had some new dampers that were way way to stiff / hard (they have done back for a revalve to soften the rear, as only had on the first 1 -3 click of 15 and solid). They gave me next to no grip at the rear.

I run about 2 deg front (have run 3 degs alot in the past), and think back is about 2 degs (it is all fully adjustable on the back). Tyres are about same size, 7" with a Yoko 048 on the, but on a 60 profile and a 15" instead of 17, but largely similar.

Thinking of going back to 3 degs all round with the soften dampers.

Think over 3 degs on my car might be two much though. Opinions? It is the TR6 BTW.




tonyvid

9,889 posts

272 months

Tuesday 20th April 2010
quotequote all
My 9-5 was -3.8deg until I sorted the ride height out! hehe

jellison

Original Poster:

12,803 posts

306 months

Tuesday 20th April 2010
quotequote all
T89 Callan said:
There will be a fairly big range dependent on the circuit.

3-5 degrees is likely the normal range that they likely work in (haven't run a BTCC car since 2006) but most other RWD race cars usually run in that range as well.
You have experience in this area? Does 3 both ends seem ok (think both are 2 currently). I know alot is the dampers, at the rear but think a bit more rear camber would help two, front is ok but maybe going back to 3 would be good.

Only done one race since a big rebuild of the car.

Scuffers

20,887 posts

303 months

Tuesday 20th April 2010
quotequote all
I would suggest 3 is the minimum - and looking at the pic above, it needs a lot more at the front...

jellison

Original Poster:

12,803 posts

306 months

Tuesday 20th April 2010
quotequote all
Scuffers said:
I would suggest 3 is the minimum - and looking at the pic above, it needs a lot more at the front...
Not sure you can read too much into that pic. It is going down paddock so will b loaded. I'll get it checked. Front seems pretty good / OK, the rear is where my main concerns are (need more traction). Likely to end up 3 both end I think (it ain't a Touring car and is not going to be changed from circuit to circuit).

Scuffers

20,887 posts

303 months

Tuesday 20th April 2010
quotequote all
jellison said:
Scuffers said:
I would suggest 3 is the minimum - and looking at the pic above, it needs a lot more at the front...
Not sure you can read too much into that pic. It is going down paddock so will b loaded. I'll get it checked. Front seems pretty good / OK, the rear is where my main concerns are (need more traction). Likely to end up 3 both end I think (it ain't a Touring car and is not going to be changed from circuit to circuit).
I would argue the front is in positive camber in that pic....

end of the day, you need to use tyre temps to work out the ideal (for a given setup), but I would suggest a shed load more than you had in those pics...

Racefan_uk

2,935 posts

285 months

Tuesday 20th April 2010
quotequote all
Ahonen said:
Yes thanks.
bh! winkhehe

Ahonen

5,032 posts

308 months

Tuesday 20th April 2010
quotequote all
Racefan_uk said:
Ahonen said:
Yes thanks.
bh! winkhehe
Evening squire.

The advantages of having a mate who happens to race one in BTCC...

Back to the OP. As Simon has indicated, you need to see what your temp spreads are and consider how the tyre is wearing first.

Or you could hire me and a pro driver for a test day and we'll dial it in for you (and bring our own sandwiches).

Scuffers

20,887 posts

303 months

Tuesday 20th April 2010
quotequote all
Ahonen said:
Or you could hire me and a pro driver for a test day and we'll dial it in for you (and bring our own sandwiches).
LOL!

I'll do the driving if you like... (and Ham salad please!)

Incorrigible

13,668 posts

290 months

Tuesday 20th April 2010
quotequote all
Scuffers said:
end of the day, you need to use tyre temps to work out the ideal (for a given setup), but I would suggest a shed load more than you had in those pics...
yes

I would try 3 at the front and 2.5 at the back in the first instance. Guessing based on what we run with 048s and guessing more because of the TRs rear suspension

Scuffers

20,887 posts

303 months

Tuesday 20th April 2010
quotequote all
A048's are noting like the same construction as said Dunlops

cptsideways

13,881 posts

281 months

Tuesday 20th April 2010
quotequote all
I'll ask a freind of mine he has one thats competed in hillclimbs for a few years & builds old nadger race cars for a living

jellison

Original Poster:

12,803 posts

306 months

Wednesday 21st April 2010
quotequote all
Like I said guys - think pretty well settle on the way I am going.

In all liklihood back to very close to how it was last time it was run seriously 3 front and 3 back, that is up 1 on the fronts (which is not too bad), and up 1.5 (i.e. double) at the back.

Yep 048 not really like a 210 Dunlop slick even though similar width, (profile being the main difference).

Pro-driver is just a driver with more cash.

The guy I really wanted / needed to contact on this stuff is like a Ghost.....

Cheers All

Over and Out.

Mazda Baiter

37,069 posts

217 months

Wednesday 21st April 2010
quotequote all
Dumb question, but have you spoken to Yokohama about what they recommend for that tyre?

Scuffers

20,887 posts

303 months

Wednesday 21st April 2010
quotequote all
Mazda Baiter said:
Dumb question, but have you spoken to Yokohama about what they recommend for that tyre?
why when he is talking about Dunlop slicks?