silky16v
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| posted on 4/6/10 at 10:32 AM |
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MK Indy R1 geometry setting
Hi had a search on here but can't seem to find what i need
i have a MK Indy R1 powered roading running on 15" alloys and uses Sierra upright and indepedant rears
was out in it last night and found it felt very skippy un-stable when turning in at high speed.
the previous owner has had all the arms powder coated painted so it'll will need setup again no doubt.
would i be right in thinking that a good base setting would be 1deg neg camber all round and about 10 deg of toe-in
caster i'm not 100% certain on so need some advice here
any info or help would be appricated please
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A1
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| posted on 4/6/10 at 11:39 AM |
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you want to get it set up neutrally first, then get it changed to suit your driving.
Right now my settings are:
front caster- +5'23
camber- -1'21
toe- 0'00
rear camber- -1.36
toe- 0'05
thats a really nice neutral set up to start on. im thinking i maybe want about 1 deg toe out on the front with around 2.5 deg camber
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Frosty
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| posted on 4/6/10 at 12:05 PM |
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The skippy feeling at high speed is probably down to the front springs. The MK-supplied springs are 350lb at the front from memory, which will give
you a very high front frequency.
The settings A1 has suggested look very sensible to me. Around a degree of negative camber is a good start. Be sure to add driver (or driver and
passenger depending on how you drive most) weight when you set the car.
Camber will change when you load up the car with occupants, so best to do it loaded. If you don't, the camber you have when you drive will be
different.
I also like to free off the wishbone bushes, bounce the car to free them, and then tighten them with the car loaded.
If you still feel the car is skipping at high speed, check for bush binding, and if that all seems ok, lower the front spring rate.
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CNHSS1
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| posted on 4/6/10 at 12:30 PM |
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quote:
Originally posted by Frosty
The skippy feeling at high speed is probably down to the front springs. The MK-supplied springs are 350lb at the front from memory, which will give
you a very high front frequency.
The settings A1 has suggested look very sensible to me. Around a degree of negative camber is a good start. Be sure to add driver (or driver and
passenger depending on how you drive most) weight when you set the car.
Camber will change when you load up the car with occupants, so best to do it loaded. If you don't, the camber you have when you drive will be
different.
I also like to free off the wishbone bushes, bounce the car to free them, and then tighten them with the car loaded.
If you still feel the car is skipping at high speed, check for bush binding, and if that all seems ok, lower the front spring rate.
/\ /\ he speaketh the truth 
"Racing is life, everything else, before or after, is just waiting"---Steve McQueen
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PAUL FISHER
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| posted on 4/6/10 at 06:05 PM |
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Also,if the wishbones have been removed for powder coating and refitted,just ensure the top ones have been fitted the correct way/side round,as its
easy done,and also makes them unstable a high speed.
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daniel mason
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| posted on 4/6/10 at 06:58 PM |
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good to see you back on the forum mate! hope your new kit is a good one and you were not in any way affected by the crazy gun man yesterday!
[Edited on 4/6/10 by daniel mason]
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Jubal
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| posted on 4/6/10 at 07:30 PM |
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It's my old car and it has 175lbs front springs IIRC. Silky - I have found the old setup sheet. This was as good as it ever was in my hands when
setup as per below:
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silky16v
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| posted on 5/6/10 at 02:34 PM |
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quote:
It's my old car and it has 175lbs front springs IIRC. Silky - I have found the old setup sheet. This was as good as it ever was in my hands when
setup as per below
thanks for that but apon checking the front springs it say 250 x 1.9 so i'm guess they ain't the same ones but can't see any reason
why John would have changed them
i'm pretty sure the arms are the right way round after looking at others on here, i think also my other BEC had a quick rack in it so thats what
maybe feels very different
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Jubal
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| posted on 5/6/10 at 07:30 PM |
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Yeah, on reflection it may be 250lbs on there. Anyway, if it's any help with your handling issues here's a vid from when I had it.
That's a 500bhp porker being chased down. It was handling ok apart from a touch of understeer. The lack of quick rack makes a huge difference
BTW.
http://www.youtube.com/watch?v=nL0gYxNVLi8
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silky16v
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| posted on 5/6/10 at 08:11 PM |
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thanks i'm sure it just wants setup ithink i'll invest in a quick rack though as were i live around here it makes a big difference
i've set the front to 120mm and shocks to 6 clicks from anti-clockwise
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