Suggestions for braking and aero
Jul 22, 2014, 11:23 AM
#64
Considered a total loss at this point. I'll either part it out and junk it or potentially look for an Evo shell that I can switch the guts to and build it completely/properly from the ground-up (cage, race seat, HANS, and everything else that I had not yet done). I am considering the 2nd option, and I have some folks encouraging me to stick with it, but I need to see the in-car video to understand what I did wrong and how to avoid it in the future.
Jul 22, 2014, 12:12 PM
#67
As for your other question, that actually was a big problem the whole time. My rear end was so light on the two biggest braking areas (one was from 120mph and the other from 145mph) that I was basically fishtailing and couldn't turn in until I righted the ship. I know our brake bias is bad (and the Essex kit is supposed to help that a little), but I don't know how to deal with it - through aero/downforce? I will have to put some research and thought into that if I do this again.
Jul 22, 2014, 01:50 PM
#69
Sorry to see that happened. 
Typically adding a bit more rear "toe in" will help stabilize the rear at braking threshold, the factory amount is there for a reason and often I see people doing zero rear toe and finding that out after the fact.
You can also get more rear Aero compared to the front to keep the car more stable at the cost of getting a bit of understeer if you go too far. It's possible that even adding a gurney flap on the stock rear wing would swing the balance to a safer setup but an aftermarket low drag high downforce wing that is adjustable for AOA is the best way to go.
Lower (softer) spring rates in the rear relative to the front will help shift the car's balance to more understeer mid corner. Lower (softer) rebound and compression settings in the rear will also alter initial turn in and exits of corners to more understeer.
Softer rear sway bar helps settle down the rear and balance can be fine tuned with tire pressure adjustments.
Typically adding a bit more rear "toe in" will help stabilize the rear at braking threshold, the factory amount is there for a reason and often I see people doing zero rear toe and finding that out after the fact.
You can also get more rear Aero compared to the front to keep the car more stable at the cost of getting a bit of understeer if you go too far. It's possible that even adding a gurney flap on the stock rear wing would swing the balance to a safer setup but an aftermarket low drag high downforce wing that is adjustable for AOA is the best way to go.
Lower (softer) spring rates in the rear relative to the front will help shift the car's balance to more understeer mid corner. Lower (softer) rebound and compression settings in the rear will also alter initial turn in and exits of corners to more understeer.
Softer rear sway bar helps settle down the rear and balance can be fine tuned with tire pressure adjustments.
Last edited by Hiboost; Jul 22, 2014 at 01:54 PM.
Jul 23, 2014, 06:28 PM
#70
Warr-
I'm NASA's CI and was briefed on the incident by the track and other drivers. By the time I went to check on you, you were being transported. Hit me up on PM as I also know someone with a vehicle you may want to check out, located in Central Jerz.
I'm NASA's CI and was briefed on the incident by the track and other drivers. By the time I went to check on you, you were being transported. Hit me up on PM as I also know someone with a vehicle you may want to check out, located in Central Jerz.
Jul 24, 2014, 11:43 AM
#71
I don't know yet, but I've been told that I put two slightly off and got some dirt on the very hot Hoosiers, which then led to a cascading effect across the next two turns where I also went off trying to gain control. I won't know until I see the video, and even then I may not really know.
As for your other question, that actually was a big problem the whole time. My rear end was so light on the two biggest braking areas (one was from 120mph and the other from 145mph) that I was basically fishtailing and couldn't turn in until I righted the ship. I know our brake bias is bad (and the Essex kit is supposed to help that a little), but I don't know how to deal with it - through aero/downforce? I will have to put some research and thought into that if I do this again.
As for your other question, that actually was a big problem the whole time. My rear end was so light on the two biggest braking areas (one was from 120mph and the other from 145mph) that I was basically fishtailing and couldn't turn in until I righted the ship. I know our brake bias is bad (and the Essex kit is supposed to help that a little), but I don't know how to deal with it - through aero/downforce? I will have to put some research and thought into that if I do this again.
Jul 24, 2014, 11:57 AM
#72
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The infamous Warrtalon evo goes down! 
You've had that thing for so long! Sorry to see!
In your last sentence, are you implying that he should be going straight so aero shouldn't be a factor? If so - trailbraking?
I don't know what he's been up to to judge what tires he should be on but with those front brakes and slicks, that rear end is going to get really light on heavy braking and I think could definitely use some rear downforce...
You've had that thing for so long! Sorry to see!
I don't know what he's been up to to judge what tires he should be on but with those front brakes and slicks, that rear end is going to get really light on heavy braking and I think could definitely use some rear downforce...
Jul 24, 2014, 04:03 PM
#74
The infamous Warrtalon evo goes down!
You've had that thing for so long! Sorry to see!
In your last sentence, are you implying that he should be going straight so aero shouldn't be a factor? If so - trailbraking?
I don't know what he's been up to to judge what tires he should be on but with those front brakes and slicks, that rear end is going to get really light on heavy braking and I think could definitely use some rear downforce...
You've had that thing for so long! Sorry to see!
In your last sentence, are you implying that he should be going straight so aero shouldn't be a factor? If so - trailbraking?
I don't know what he's been up to to judge what tires he should be on but with those front brakes and slicks, that rear end is going to get really light on heavy braking and I think could definitely use some rear downforce...
Jul 24, 2014, 04:47 PM
#75
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There is only one way to stop the evo "dance" under hard braking, replace all the bushings in your FRONT lower control arms with something stiffer. It will feel like a new car. BTW, sorry to hear about the wreck. Good luck on the rebuild.