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 Castor/camber toe for A 048r 12s

 Created by: CooperTune
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 Posted: Aug 28, 2015 02:10PM
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Not trying to beat you up. I am glad someone wants to talk about it. I don't want to burn up a set of these testing but if that's what it take so be it. This is a steel spring car and I'll take a look at limiting droop. Thanks Steve (CTR)

 Posted: Aug 28, 2015 11:53AM
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Well, I used my on the street and that is where the rear would go "light" on certain bumps/jumps. Also when jacking up. Had to remember to check that the cones were seated before lowering the car back down.

I ran that similar setup with good results before the change over to the 048Rs. When I changed to them, I ran out of time to really track or autoX the car. All of my miles were done in a "fast road" manner.

No swaybar. Maybe one day but not yet and sorry about the Rover wheel size. I had a momentary lapse when I saw the 5.5". Yes, the Rovers are 4.5. 5.5" rims should be very well suited for these tires. I have to consult my print out from the last time it was adjusted. You are probably right with the 1/8th toe in. Its was a 1/16th I bet.

 Posted: Aug 28, 2015 08:47AM
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I have at least 20 Rover minilite style wheels all of which are 4.5 wide. The plan is to run and remove. Having 13X6 and 12X6 with mounted tires a little less soft. Were you running a rear sway bar such as KAD? Under what conditions does your car go light? Most tracks don't have speed bumps. I do have digital gauges, turn tables and scales. Did you just pull numbers out of the air or are these a result of testing? I realize 12s and 13s are far less forgiving than 10s. I'd think 1/8 toe in at the rear would cause push and make it very hard to rotate the car. There is an over pass ramp on the way to work, nice down hill off camber left. With 145X12s I can run 57 mph before the car begins a four wheel drift very controled and comfortable in spite of the gaurd rails on both sides. Anyone else have some imput. Thanks you have given me a few things I had not considered. Yes we know they don't last long. Steve (CTR)  

 Posted: Aug 28, 2015 06:29AM
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I actually just switched back to A538s from the A048s. I am running them on Rover Minilight wheels, which I believe are 5.5. The tires fit wonderfully. I sorely miss them on my car. Just the look of them was amazing. I know that means nothing but going back to the A538’s, I feel like the car has a totally different, less menacing look. Anyway.

The first problem I ran into with these was the ride height. These have a very good bit lower profile then others and to get the car hunkered down enough, the rear suspension bits would go loose when in the air. A limiting strap would need to be fitted. I have a thread about that somewhere. As for measurements, that is REALLY tricky to just spell out. What are these cars used for? Just track or complete mix? It is super important to get whatever you do perfect as these tires don’t like it otherwise. The shop that did my 4-wheel alignment screwed something up and my first set of fronts lasted about 1000 miles. I guess it was a bit my fault for not checking the tires closer but still. I would love to hear what others have gotten mileage wise with these. I happened to have a second set to put on the fronts and ran them for another 1500 miles or so. I am not sure what others have gotten but I doubt they will last much over 3k. Maybe with lots of rotations.

My setup was pretty standard, 1.5 degrees camber in the front, .5 in the rear. I believe I had about 4 degrees of caster in the front which is getting reduced to 2.5-3 when it goes in soon. Toe was set (or was supposed to be set lets say) at 1/16th out up front and 1/8th toe in at the rear.

These tires are VERY sticky and I actually found that the rear was very hard to come unstuck. I’m not looking for a totally wayward rear but I need it to slide a bit when I need to rotate the car a bit more. I had more understeer for sure. I wish I had the means and time (on the track and road) to really fiddle with the setup to get it dialed in and see if I could have corrected it.

Oh, and seriously watch out for flat spots on these. Not from locking up brakes but from sitting. These are noisy tires out of the box but only get worse if let to sit. I actually think they have a recommended shelf/road life. They certainly have a temp recommendations. They should not get too cold. They get very slippery.

 Posted: Aug 28, 2015 04:31AM
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I should know better but I'll ask anyway. I'm in the process of doing a ton of suspension work on a later mini. A roll up window car but a classic all the same. It will roll on 5.5 X 12 rims with A 048r tires. I have run on 10 inch slicks, Hoosers, shaved Yoks, and 13 inch slicks. I have notes from all out vintage outings as well as from years of autocross. Once back on the ground ride height, corner weight, castor, camber, and toe will be adjusted at each end. I have not worked with these tires before but have several sets now for customers wanting confidence in high speed cornering. I'm welcome at the local NASCAR 4/10 mile oval and run it both direction which make the guys laugh. My question is does anyone here run these tires and have suggestions as to settings? I realize these tires have a short life I want to get the best out of them and not damage them with silly settings. Steve (CTR)