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How can I fix under steer?

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Old Nov 14, 2014 | 04:49 PM
  #46  
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Originally Posted by letsgetthisdone
Its very balanced, and doesn't snap oversteer when I left mid corner.
Originally Posted by letsgetthisdone
I might get a slightly bigger rear bar, but I really don't want to gain that snap over steer coming off the throttle in a long corner.
You should only be lifting slightly if you are starting to understeer to shift weight to the front to get the front tires to grab.

How much do you lift?
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Old Nov 14, 2014 | 07:18 PM
  #47  
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Originally Posted by letsgetthisdone
Could be tires too. I daily drive on bridgestone re760's. Haven't driven it on my track tires (Dunlop Z2's) with the new diff. So we shall see. With how much the diff helped, understeer may go away on stickier tires.
Should handle more or less the same with either tire, just higher limits with the Dunlops.


Originally Posted by golgo13
You should only be lifting slightly if you are starting to understeer to shift weight to the front to get the front tires to grab.
Agreed. If it's a long turn, I'm assuming it's high-speed. It should take a VERY small amount of modulation. That goes for any turn, just gotta be extra mindful when doing 90+ LOL.
My next setup will be opposite: over steer on entry and then modulate coming out, on the edge of over steer, not under. Should be fun and quite a bit faster
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Old Nov 15, 2014 | 06:45 PM
  #48  
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Originally Posted by letsgetthisdone
That is its real purpose. By raising the roll center, you reduce under steer, to a point. I say that because there is a point of diminishing return. We did this on my ranger when we built new front suspension. We set scrub radius at .5" off the SAI, 10* positive castor, -3* camber, and the roll center is much higher than OEM. With 14" of wheel travel, and 35" tall tires, it surprises everyone that rode in it with how much grip the front end has, and how well it handles despite 30* of body roll...ha . And that was with rear leaf springs. I can't wait for it to be done with the new 4-link out back, since it will give the rear suspension a real instant center and roll center. She's going to be an animal...
This is an Evo though. I don't know how close the suspension on a ranger is to an Evo especially stock for stock or even lowered to the point that that adding the RCK even matters. I'll be honest in that I've had the part for years and tracked on it and it didn't make as much a noticeable change in the dynamics of the car as say a larger rear sway or stiffer rear springs.

Last edited by codgi; Nov 15, 2014 at 06:53 PM.
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Old Nov 17, 2014 | 09:02 AM
  #49  
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Originally Posted by kaj
Should handle more or less the same with either tire, just higher limits with the Dunlops.




Agreed. If it's a long turn, I'm assuming it's high-speed. It should take a VERY small amount of modulation. That goes for any turn, just gotta be extra mindful when doing 90+ LOL.
My next setup will be opposite: over steer on entry and then modulate coming out, on the edge of over steer, not under. Should be fun and quite a bit faster


The dunlops do change it because they have more grip at the limit, and provide more grip once they go past the limit, or if they're spinning. So if one end of the car gets pushed to far, their is still more grip.


Originally Posted by golgo13
You should only be lifting slightly if you are starting to understeer to shift weight to the front to get the front tires to grab.

How much do you lift?

I slowly roll out until the front comes back to me. The rear diff seems to work better every time I change the fluid (been changing it every 500 miles since its new). Hopefully with one more fluid change all of the moly assembly lube TRE uses will be flushed out and it will grab even better. The car is starting to do what kaj is shooting for, but its very planted on entry.
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Old Nov 17, 2014 | 09:05 AM
  #50  
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Originally Posted by codgi
This is an Evo though. I don't know how close the suspension on a ranger is to an Evo especially stock for stock or even lowered to the point that that adding the RCK even matters. I'll be honest in that I've had the part for years and tracked on it and it didn't make as much a noticeable change in the dynamics of the car as say a larger rear sway or stiffer rear springs.

chassis dynamics are chassis dynamics. I noticed a decent difference with the RCK in my evo. Well worth the couple hundred dollars. Its all about creating a combination. Every part adds a little bit to the car. And every bit counts.
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Old Nov 17, 2014 | 12:47 PM
  #51  
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Originally Posted by letsgetthisdone
The dunlops do change it because they have more grip at the limit, and provide more grip once they go past the limit, or if they're spinning. So if one end of the car gets pushed to far, their is still more grip.
as you mention below: chassis dynamics is chassis dynamics. a stickier tire isn't going to change the balance of the car. if you understeer on street tires, you will understeer on rcomps, it will just take more to push. you are better off getting the car to handle how you want first, but tossing on sticky tires is a workable band aid LOL.
for example, i just drove an enduro event in a stock-suspension Evo with a RSB, my re-stacked diff, and Hoosiers. the tires did a lot to hide the weaknesses of the suspension setup. at the end of the day, they were overworked, which is to be expected.. but they enabled us to have two of the three fastest times of the day. had the issues been sorted out beforehand, not only would we have been faster, but the tires wouldn't have been so beat up. just my two cents, though. i'm just making conversation because i'm home with a day off haha
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Old Nov 17, 2014 | 01:46 PM
  #52  
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Originally Posted by kaj
as you mention below: chassis dynamics is chassis dynamics. a stickier tire isn't going to change the balance of the car. if you understeer on street tires, you will understeer on rcomps, it will just take more to push. you are better off getting the car to handle how you want first, but tossing on sticky tires is a workable band aid LOL.
for example, i just drove an enduro event in a stock-suspension Evo with a RSB, my re-stacked diff, and Hoosiers. the tires did a lot to hide the weaknesses of the suspension setup. at the end of the day, they were overworked, which is to be expected.. but they enabled us to have two of the three fastest times of the day. had the issues been sorted out beforehand, not only would we have been faster, but the tires wouldn't have been so beat up. just my two cents, though. i'm just making conversation because i'm home with a day off haha
I agree, it's more of a mask then a fix. The balance is still the same, the tire just expands the limit. Especially because the rcomps have more grip when pushed beyond their limit.
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Old Nov 19, 2014 | 01:09 PM
  #53  
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Understeer needs to be fixed with stiffer springs, rear diff, and a good alignment. Kaj co-drove my car this weekend and yes it was fast, yes it was fun... But until my coilovers are installed and set up properly the car still will not handle like it is able to. This is what hard driving and stock springs looks like... With a6's
Attached Thumbnails How can I fix under steer?-1657b439-8ce9-430a-b2ab-40673807d863.jpg  
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Old Nov 19, 2014 | 01:56 PM
  #54  
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3 wheelin like a boss lol. my car doesn't quite pick the tire up.



Video, this is before it had the rear diff done..

Attached Thumbnails How can I fix under steer?-evo2.jpg  

Last edited by letsgetthisdone; Nov 19, 2014 at 01:58 PM.
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