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Too stiff in the rear - Video

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Old Aug 5, 2009 | 04:09 PM
  #16  
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Originally Posted by boomn29
Wow, in watching both vids, I gotta say my car has never handled like that. If I throw my car into a corner too fast it usually converts to an expected 4-wheel drift sideways to scrub the speed. I counter with steering input and start to build throttle back in to pull it out.

Maybe setup differences, maybe driver style or preference? And I've ran the same suspension setup all year, both with street tires, r-comps and hoosiers. I'm not a fan of a loose rear myself (any accidental puns totally intended)
That was my first hot lap of the day (lap 2, session 1) and I turned in more aggressively than usual to have little fun and "see what would happen." Generally I don't need much counter steer unless I'm pretty abrupt with the inputs.

Like boomn29, my car generally goes into a controllable 4w drift when turning in too fast unless the fronts overheat and then it will push. T5 at Laguna is a good example. Turn in fast, scrubbing speed with neutral throttle until the camber catches you, then wide open.
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Old Aug 5, 2009 | 05:05 PM
  #17  
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Yea it did come from nowhere. I do kinda dig understeer a bit...

Here is what i call loose - LINKY


P.S I really dig the track
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Old Aug 5, 2009 | 05:58 PM
  #18  
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^Very nice car control. Either you have too much power or tires didnt have enough grip...haha.
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Old Aug 5, 2009 | 06:09 PM
  #19  
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I'll agree that the track looks like a blast! I love elevation changes and the woods looks awesome, but I would trade them for runoff room anyday.

As for the spin, it did seem to come out of nowhere, but you also didn't do enough to catch it as you said yourself that you fed it some mellow counter steer. I'm yet to add a rear sway bar but am weary of making myself more prone to oversteer at times like this.
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Old Aug 5, 2009 | 07:39 PM
  #20  
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Its hard to really tell whats up cause the camera is kinda moving around a bit. But i think a little more throttle could have turned that around.... Its hard to hear too, or its just my comp. Were you steady on the gas through the corner or did you lift enough to make any kind of surge from bypass valve?

Hey boomn, post my spin from warming my tires at the last NASA event!!!
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Old Aug 5, 2009 | 08:21 PM
  #21  
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Hard to tell based off of your in-car. Cant see your feet. And i can only see your right hand. I listened as much as i could, and it sounds like you lifted around mid-corner. I dont hear any/enough throttle input. If your rear end steps out at mid-corner and you dont apply enough throttle at the right time, your rear end is going to continue to step out even more. Do you know how to analyze your traqmate data?
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Old Aug 5, 2009 | 09:52 PM
  #22  
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Off throttle oversteer is a ***** and will cause you to loop yourself many times.
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Old Aug 5, 2009 | 10:07 PM
  #23  
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Originally Posted by EvolvedMR
looked like it came out of nowhere.

I'm not convinced that the current trend of reversing spring rates is necessarily the best/fastest. If you have to have rebound settings way different from front to back to get a neutral car something's off. I had less of a difference front to rear than 'out of the box' set ups, but not swapped. then again what do I know
What setting did you run the Hotchkis bar at? I just bought one to install with the Ohlins. Can't decide if I should leave the springrates or follow the "trend" and swap them before I'm cornerbalanced. I might autoX some so extra rotation might be nice...but I really don't want that to happen. Spin in the wrong spot at PR and you won't be driving home...thats for damn sure.
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Old Aug 5, 2009 | 10:13 PM
  #24  
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I'm surprised it spun. Your steering input was pretty mild. I would think it would take some serious trail braking to get it to spin like that. Or just having you suspension too stiff in the rear I guess
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Old Aug 6, 2009 | 05:23 AM
  #25  
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From: B-More
Originally Posted by dbsears
What setting did you run the Hotchkis bar at? I just bought one to install with the Ohlins. Can't decide if I should leave the springrates or follow the "trend" and swap them before I'm cornerbalanced. I might autoX some so extra rotation might be nice...but I really don't want that to happen. Spin in the wrong spot at PR and you won't be driving home...thats for damn sure.
mid. I would start at soft and see how it feels first though. your going to be stiffer than most right off the bat
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Old Aug 6, 2009 | 08:15 AM
  #26  
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+2 for taking setup notes - I need to start doing that.

- I came into the corner pretty much same same as I always do, maybe 1-2 mph faster. There was no lifting when the spin started, it was at steady throttle. I lifted about the time I realized I wasn't going to be able to grab it. Again, I should have gave it more throttle. It's funny because when it started it was so subtle that I had to kinda wait to verify what I was feeling was actually the back end. At that moment I wasn't fast enough with steering/throttle.

- I looked at the traqmate data and it's hard to see the difference until the spin is really in progress. I'll go back again and look closer.

- The BFG R1's seems to be very stealthy in terms of the threshold. As you can see they don't make a sound until they are full-on sliding. You really have to pay attention to feel things like slight push exiting a corner etc.

- I pulled the 25mm Progress bar last night. I've got a couple local guys willing to trade me with softer ones - which is pretty cool.
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Old Aug 6, 2009 | 10:00 AM
  #27  
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Originally Posted by EvolvedMR

I'm not convinced that the current trend of reversing spring rates is necessarily the best/fastest. If you have to have rebound settings way different from front to back to get a neutral car something's off. I had less of a difference front to rear than 'out of the box' set ups, but not swapped. then again what do I know
No disrespect, but you are completely wrong. A good setup will not have simmilar valving front to rear, and as such you cannot comare your settings front to rear. Also, its not necesarily reversing the spring rates. But you should run higher in the rear. Even when you do, your wheel rates will still be higher in the front than the rear.


On my AST Doubles I run 10k front 12k rear (and Im eventually going up to 12 front 14 rear) and I run something like 9 out of 12 "clicks" up front, and 6 out of 12 in the rear, if its a smooth course, Ill run a "click" higher up front and even more in the rear. It is honestly just all about how your valving is working with your springs and overall setup, nothing more.

After watching the vid again, while the car looked a bit loose there, you could have saved that no problem.

Last edited by RaNGVR-4; Aug 6, 2009 at 10:08 AM.
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Old Aug 6, 2009 | 10:02 AM
  #28  
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^^^ Truthiness. Every setup is different.
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Old Aug 6, 2009 | 10:51 AM
  #29  
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How much rear camber are you running?

IMO stiffer rear springs is not a trend....it's the right way to do things for the EVO.

- andrew
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Old Aug 6, 2009 | 10:51 AM
  #30  
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From: B-More
Originally Posted by jid2
^^^ Truthiness. Every setup is different.
true. there is also more than one way to skin a cat.... or more than one way to reach a desired effect with suspensions. all have their plusses, drawbacks, and compromises.
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