Barkalarr
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| posted on 5/5/14 at 07:06 AM |
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Indy Tracking
I've had the tracking done on my Indy to 20 minutes tow in.
I've still got to shim the rears because there is a bit of tow in on the off side, but before I do shim it, the car is ever so twitchy and
doesn't self centre very well.
Tyre pressure is 20 psi
What's the general consensus for the tracking on an Indy ?
What do you have yours set to ?
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Nickp
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| posted on 5/5/14 at 07:20 AM |
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Can you dial in any more castor?
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Barkalarr
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| posted on 5/5/14 at 07:36 AM |
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Nope - the off centre doughnuts are towards the front.
This is only going to help the self centre - I can put up with this.
I just want to see what the tracking setup consensus was to see if mine is ok.
it might just be the way it drives - my DD isn't like this at all (as expected). I don't recall my old Indy to drive like this but that
didn't have a QR - so it might just be that.
It's certainly fun when you go round a roundabout. You don't need to turn the wheel much.
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britishtrident
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| posted on 5/5/14 at 07:50 AM |
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Start with bringing the tyre pressures down, more so at the front.
As regards rear toe how was it measured? as on the rear with some types of gauge (Dunlop and other optical lever types) the toe-in and toe-out
scales are reversed when reading the rear.
However it could just be down to the roll couple distribution, in greatly simplified terms if the front springs are too soft compared to the rear the
car will over-steer.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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Nickp
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| posted on 5/5/14 at 07:57 AM |
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quote:
Originally posted by Barkalarr
Nope - the off centre doughnuts are towards the front.
This is only going to help the self centre - I can put up with this.
Yes castor helps self centre, but in turn that helps stabilty too. But if you're maxed out then fair enough 
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jwhatley
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| posted on 5/5/14 at 08:12 AM |
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Ive seen quite a few setups with toe out on the front. But it depends on what your application is for. Track or road? and are you worried about tyre
wear?
To get some more castor on the front of an indy you will need to go to rose jointed wishbones. Offset mushroom inserts aren't used for castor
adjustment, but they will increase trail if you wish, which will aid self centreing. - What is your current castor angle?
Toe in gives you stability in a straight line but sacrifices your turn responsiveness (or at least thats how ive understood it) Toe out would give you
better cornering, but make the car less stable in a straight line.
At the end of the day, there is no definitive setup figure if you want the car to perform how you want it. Most of the time it will be set to an
general area and then adjusted to suit the driver.
A friend of mine gave me his figures for his RR, which is a track car. So you can compare, note these are his base figures.
-2 degrees each side front camber
5 degrees front castor each side
5mm toe out at rims on front
rear camber is 1.4 neg both sides
1.7 rear toe in at rims
Softer shock and spring set up to feel compliant over curbs and bumpy tracks like Oulton.
I am having my IndyR setup again after removing the rose joints for powder coating on weds. Ill post the figures up so you can compare. I would like
to think this year my primary use would be track, but i do drive it on the road.
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Barkalarr
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| posted on 5/5/14 at 08:24 AM |
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My main driving will be on the road.
Yes - there is concern with tyre wear - currently running A048's all round.
I want it to be good in a straight line, less worried about cornering - it handles like its on rails anyway.
Powered by a Zetec it's really smooth - so I'm a very happy chappie.
I've had the tracking done by my local tyre place where they put lazer on the front and rear wheels. He obviously didn't know what the
front setup should be so I said tow in by 20 minutes. This was a bit of a thumb suck, so I wanted to know what others are doing so I can take it back
to them and change it (if required)
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davidimurray
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| posted on 5/5/14 at 08:51 AM |
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quote:
Originally posted by jwhatley
Ive seen quite a few setups with toe out on the front. But it depends on what your application is for. Track or road? and are you worried about tyre
wear?
To get some more castor on the front of an indy you will need to go to rose jointed wishbones. Offset mushroom inserts aren't used for castor
adjustment, but they will increase trail if you wish, which will aid self centreing. - What is your current castor angle?
Toe in gives you stability in a straight line but sacrifices your turn responsiveness (or at least thats how ive understood it) Toe out would give you
better cornering, but make the car less stable in a straight line.
At the end of the day, there is no definitive setup figure if you want the car to perform how you want it. Most of the time it will be set to an
general area and then adjusted to suit the driver.
A friend of mine gave me his figures for his RR, which is a track car. So you can compare, note these are his base figures.
-2 degrees each side front camber
5 degrees front castor each side
5mm toe out at rims on front
rear camber is 1.4 neg both sides
1.7 rear toe in at rims
Softer shock and spring set up to feel compliant over curbs and bumpy tracks like Oulton.
I am having my IndyR setup again after removing the rose joints for powder coating on weds. Ill post the figures up so you can compare. I would like
to think this year my primary use would be track, but i do drive it on the road.
Are you sure that is toe OUT on the front?
Gallery 1 http://www.facebook.com/media/set/?set=a.116893465324.130778.601005324
Gallery 2 http://www.facebook.com/media/set/?set=a.245243755324.181913.601005324&l=a9831a9319
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Gallery 4 http://www.facebook.com/media/set/?set=a.490098255324.297598.601005324&l=efb083b7df
Gallery 5 http://www.facebook.com/media/set/?set=a.10150244028550325.366987.601005324&l=583fd5cd3a
Gallery 6 http://www.facebook.com/media/set/?set=a.10150550640070325.430417.601005324&type=3&l=fe779b358c
Duratec Engine Swap https://www.facebook.com/media/set/?set=a.10152527759580325.1073741828.601005324&type=1&l=40aae5e72f " target="_blank"> https://www.facebook.com/media/set/?set=a.10152527759580325.1073741828.601005324&type=1&l=40aae5e72f
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jwhatley
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| posted on 5/5/14 at 09:29 AM |
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Yep, toe out (pointing away from each other) on the front. With toe in (point towards each other) on the rear for braking stability and apex grip.
The front would be the opposite on a road car though.
Remember that setup is more towards track setup where tyre wear isn't as much of a concern as you tend to budget more for tyres!
Would be interesting to see a few other peoples setups
[Edited on 5/5/14 by jwhatley]
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britishtrident
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| posted on 5/5/14 at 11:28 AM |
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Toe-in at the front basically dampens the steering response and gives stability at the cost of turn in particularly on very tight corners.
Toe-in at the rear increases understeer and helps kill snap oversteer.
Minum tyre wear setting is zero toe.
[Edited on 5/5/14 by britishtrident]
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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jwhatley
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| posted on 5/5/14 at 01:20 PM |
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0 on the rear will make it feel quite floaty at high speed. Personally I'd always have a bit of toe in at the rear.
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40inches
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| posted on 5/5/14 at 01:24 PM |
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Yellowcab has put the settings made to his car, at Procomp, in a thread of his. They work well on mine too
Tyre pressures are a bit high at 20psi, I'm running 16psi all round, tracks straight and sharp turn in.
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jwhatley
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| posted on 5/5/14 at 02:46 PM |
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Ollies setup is very good. I also have that on a bit of paper!
Don't know if setup would be different between an indy and an indyR though, Indys suffer with positive camber in roll at the rear.
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