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914World.com _ The Paddock _ more rear camber required

Posted by: returf Apr 4 2015, 02:00 PM

what's the most rear camber you can get witout screwing up the toe too much?

I tried adding a 20mm spacer under the front bolt of the adjustment plate, thereby pushing the rear upwards ( a bit ghetto i know) and this gives about - 2degrees camber. Are there any plates available to do this properly?

Posted by: brant Apr 4 2015, 06:21 PM

Positive camber?

Performance tires will like negative camber for contact patch
We got around - 2.75 to -3.00 on the race car with stock pickups.

But suspension and ride height play into the numbers.

Posted by: returf Apr 4 2015, 06:59 PM

Yes thanks Brant, more negative camber required. I'm running 275 x 18 slicks and I see that only the outside 15mm seems to be scuffed a little.

Posted by: brant Apr 4 2015, 07:26 PM

What ride height? Spring rate? Radial slicks it sounds like. What brand?

Posted by: returf Apr 4 2015, 11:51 PM

here's the adjustment to get to - 2.2 degrees

tyre wear

and tyre

Posted by: SirAndy Apr 5 2015, 02:02 PM

Your trailing arms (or tub) may be bent ...

Without any shims i can easily get -2.5 degrees camber on each side.

But, the Goodyear slicks i'm running don't actually like that much camber. I run them at -0.5 degrees, any more and they'll eat up the insides of the tires.
popcorn[1].gif

Posted by: returf Apr 5 2015, 06:03 PM

QUOTE(SirAndy @ Apr 6 2015, 08:02 AM)

Your trailing arms (or tub) may be bent ...

Without any shims i can easily get -2.5 degrees camber on each side.

But, the Goodyear slicks i'm running don't actually like that much camber. I run them at -0.5 degrees, any more and they'll eat up the insides of the tires.
popcorn[1].gif

That is entirely possible, as they are lengthened by 90mm and moved out on the tube by 60mm. Ok then ,it looks like I'll have to make up new outside mounts. What rear toe are you using SirAndy?

Posted by: SirAndy Apr 5 2015, 07:45 PM

QUOTE(returf @ Apr 5 2015, 05:03 PM)

What rear toe are you using SirAndy?

I measure the toe on the wheel rim, so that might not help you much.
On my 15" wheels, i run -3mm toe.

Meaning, compared to the alignment string, the difference between the rear distance to the wheel and the front distance to the wheel is 3mm.

Posted by: returf Apr 5 2015, 09:33 PM

QUOTE(SirAndy @ Apr 6 2015, 01:45 PM)

QUOTE(returf @ Apr 5 2015, 05:03 PM)

What rear toe are you using SirAndy?

Yes that's the way I do it as well. thanks for that
Mike

Posted by: brant Apr 8 2015, 01:15 PM

the outside corner that you are seeing is what is likely not touching during cool down and drive into the pits

you really need a temp probe on the center and inside to compare numbers to the outside edge. also do this in the hot pits or tech with another body... the temp numbers change by the time you drive into the pits.

I'm also wondering if your ride height is high enough to effect your numbers. Do you have to run a lot of ride height on account of the 18inch wheel diameter?

what do the Michelin engineers recommend for tire temps?
have a talk with the Michelin engineers before you change things