131? They should be 132 items.
What's your bump steer like?
Do you have a split alloy column bearing fitted?
131? They should be 132 items.
What's your bump steer like?
Do you have a split alloy column bearing fitted?
Last edited by strat24v; 20-12-2015 at 15:39.
Typo yes 132! Bump steer how does one check this on the road? I hit a few bumps both cornering and straight at c70mph and the car was quite well behaved.
re column bearing are you referring to the top of the steering column?
Bump steer is something that you need to reduce or eradicate while setting up your suspension. It's probably more important to fix than any other part of your chassis setup. If you have the hawk build manual, there is a section in there in how to fix it, if not I'm sure someone on here can give you a link to it.
The split alloy bearing is fitted on the intermediate steering shaft. Owners generally replace them with a proper bearing of some kind.
I have the build manual and have read this up.
What are the symptoms of bump steer?? as all I am trying to dial out is the straight ahead sensitivity at the mo. Car was built by the legendary Bob Pilot rip so with all the shimming evident I think it is fair to say I will not touch yet.....
Unpleasant straight ahead.
Car steers straight with no hands, just sensitive to hands!! Ie no Ackerman effect.....
Further transformed after a professional setup today.
Used a firm in Colchester that specialise in track hardware - mostly drifting.
The biggest change is in tyre pressure up to 28 front 30 rear from 22 all round. Castor wound back to 4 degrees, 1.5 deg camber on front, .7 on rear, and parallel toe rear and 2 deg toe out front.
Was a bit mystified until I drove it and found it delightful (not a delightful handful). We will have to see. The overall comment was nothing much is going to remove the twitchiness until I source different tyres as the super soft TB15's will always tramline due to their stickiness......
So I gave him the task of finding a set of matching tyres (there aren't any other than the Pirelli equivalents are there??)....
[QUOTE=Lancialulu;29755
Used a firm in Colchester that specialise in track hardware - mostly drifting.
The biggest change is in tyre pressure up to 28 front 30 rear from 22 all round. Castor wound back to 4 degrees, 1.5 deg camber on front, .7 on rear, and parallel toe rear and 2 deg toe out front.
.[/QUOTE]
hope you've got good insurance.......
Sounds like the perfect settings for a drift car.....Originally Posted by Lancialulu
The proof will be in the driving but be very careful, I've worked on a number of high performance mid engine cars & your settings contradict what those companies used.
295 section TB15's are the tyre I'd fit to the back of the 15" wheeled GP4 Strato's replica, the stickiness of the tyre I think is irrelevant to the twitchyness.
"You can lead a horse to water, but a pencil must be lead"
Stan Laurel
Change of header title!!!
Just finally got Shades off Castor / tracking gauges and out for a test run
Transformed!
2mm Toe in Front
0.2 degree Toe in each side rear
4.5deg Castor front
-1.1 camber front each side
-0.4 camber rear each side
Ride height 15mm higher rear to back
Front tyre pressure 20psi
Rear 22psi
Steering slightly heavy at parking speeds but lightens up and has the twitchyness at speed has gone. Roads are too greasy to explore handling at any limits but I have a big grim on my face as IT IS SORTED!!! AND I love driving it!!!!
This is just a base line and in due course I will put it on laser rig to check my measurements done mostly with digital protractor set up.
I think the biggest contributor to getting to this point was to increase the castor on the o/sf which was a shade over 1.5 degrees before adjustment. I have yet to find any bump steer issues so conclude this was properly set up by my predecessors.
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