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post #1 of 16 (permalink) Old 06-23-2010, 03:15 PM Thread Starter
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reducing rollout ideas

My wife and I have taken a liking to index racing and it seems to be working well for us so far. We have two first place finishes, one second place, and one fourth place over the last two times we have done it. There is a problem though that I need to address if I want to keep doing this.

No matter what I do, I can't get better reaction times than .670-.690 with .5 being perfect. It is a pro tree so I can't launch any earlier. I don't think it's a driver error unless i'm just slow. Either way, I'm trying to reduce the vehicle rollout or do something that will allow the reaction time to get better. I am already practicing so don't say that lol.

The only thing I know to do is go with shorter tires 25 inch or 24 inch instead of 26 or working on improving my 60 foot by doing 4:30 gears instead of 3.73's.

I can't seem to find 25 inch tall tires though. My mods are below. I'm welcome to any suggestions. Getting my time in the .580 range would make me happy. My index is 8.50 (1/8th) so no one is cutting perfect lights. The cars just aren't fast enough.

Mods are in my signature. I'm running 165/85/15 tires now. If anyone knows where to get decent priced 25 inch tall tires that aren't drastically wider, I would appreciate the help.

Luke

96 v8 4.6 explorer, kooks headers, off road x, magnaflow mufflers, cl tb/plenum, lmaf, gt tube, xcal tune, alum shaft, 3800 dirty dog converter, darrin trans, 373 gears, hoosier slicks on fanblades, pbr brakes, Skinnies on front, No PS or AC, Aeromotive EWP, major weight removal (3380 LBS), 12.78 OLD COMBO.
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post #2 of 16 (permalink) Old 06-23-2010, 03:24 PM
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I don't see how tires are gonna affect your reaction time...? Your reaction time is when the car breaks the starting beam. When are you leaving the line? General rule is on the 3rd yellow, nail it. You might also try deep staging.

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post #3 of 16 (permalink) Old 06-23-2010, 05:00 PM
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Did I read that right? 165/85/15? I see slicks in your sig, but I'm guessing you're not running those for the track events.. that or you meant 165 is your front tire size. If 165 is correct... massive wheelspin?

a black car.
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post #4 of 16 (permalink) Old 06-23-2010, 05:50 PM
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It's no problem getting shorter than 26" tires, but I can't think of any that are DOT if that matters.

Do the rules not allow deep staging?

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post #5 of 16 (permalink) Old 06-23-2010, 06:09 PM
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It's no problem getting shorter than 26" tires, but I can't think of any that are DOT if that matters.

Do the rules not allow deep staging?
I agree with KD. You either need to stage deeper in the stage light to the point that you are nearly turning off the pre-stage light or go off the tree a bit earlier. Depending on traction and how the car reacts, I've seen cars start off the 2nd full yellow down the tree. Shouldn't have to do that but try it like you are staging now and see what happens.

The main thing is to experiment with those things, see what the RT's look like and work on getting the consistancy at that point.

A couple inches make all the difference in the world sometimes.

I'm sure Kris will agree too, practice, practice, practice.

Steve
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post #6 of 16 (permalink) Old 06-23-2010, 06:30 PM Thread Starter
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Quote:
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Did I read that right? 165/85/15? I see slicks in your sig, but I'm guessing you're not running those for the track events.. that or you meant 165 is your front tire size. If 165 is correct... massive wheelspin?
165 are the front tires lol. I couldn't imagine them on the rear. I can spin slicks now.

96 v8 4.6 explorer, kooks headers, off road x, magnaflow mufflers, cl tb/plenum, lmaf, gt tube, xcal tune, alum shaft, 3800 dirty dog converter, darrin trans, 373 gears, hoosier slicks on fanblades, pbr brakes, Skinnies on front, No PS or AC, Aeromotive EWP, major weight removal (3380 LBS), 12.78 OLD COMBO.
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post #7 of 16 (permalink) Old 06-23-2010, 06:33 PM Thread Starter
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It's no problem getting shorter than 26" tires, but I can't think of any that are DOT if that matters.

Do the rules not allow deep staging?
I can't deep stage to the point it turns off the first light. I do slide forward another 2-4 inches past the stage beam but I'm still getting in the high 6's for reaction times. I can't really push it any further without going to far.

A pro tree is not friendly to slow cars.

I am looking at 24 and 25 inch front runners from goodyear or mickey thompson currently. I was hoping for a DOT tire but it doesn't look like it is going to happen. Should I get a 25 or 24 inch?

96 v8 4.6 explorer, kooks headers, off road x, magnaflow mufflers, cl tb/plenum, lmaf, gt tube, xcal tune, alum shaft, 3800 dirty dog converter, darrin trans, 373 gears, hoosier slicks on fanblades, pbr brakes, Skinnies on front, No PS or AC, Aeromotive EWP, major weight removal (3380 LBS), 12.78 OLD COMBO.
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post #8 of 16 (permalink) Old 06-23-2010, 06:38 PM Thread Starter
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I agree with KD. You either need to stage deeper in the stage light to the point that you are nearly turning off the pre-stage light or go off the tree a bit earlier. Depending on traction and how the car reacts, I've seen cars start off the 2nd full yellow down the tree. Shouldn't have to do that but try it like you are staging now and see what happens.

The main thing is to experiment with those things, see what the RT's look like and work on getting the consistancy at that point.

A couple inches make all the difference in the world sometimes.

I'm sure Kris will agree too, practice, practice, practice.
I do need more practice. That is a given. The pro tree kills any ideas of leaving on the second light though. It's all three on at one time.

96 v8 4.6 explorer, kooks headers, off road x, magnaflow mufflers, cl tb/plenum, lmaf, gt tube, xcal tune, alum shaft, 3800 dirty dog converter, darrin trans, 373 gears, hoosier slicks on fanblades, pbr brakes, Skinnies on front, No PS or AC, Aeromotive EWP, major weight removal (3380 LBS), 12.78 OLD COMBO.
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post #9 of 16 (permalink) Old 06-23-2010, 08:27 PM
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Yeah, I have a hard time adjusting to a pro tree as well.

But even with a pro tree, once I find the 'sweet spot' and consistent reaction times, I do not try to do anything to change the launch except to stage deeper into the lights to reduce rollout and hence lower the RT slightly. That will result in slightly higher ETs but you can adjust the dial for that easy enough. The tough part is rolling into the light the same each time, but like everything else, with practice it does get better.

Reaction time is not only a measure of your reaction but also a measure of the car's reaction. But I think rollout is only part of the equation. Suspension setup also plays a huge role. One of the reasons the IRS is dissed so bad at the track.
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post #10 of 16 (permalink) Old 06-23-2010, 10:53 PM
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Another thing to do would be limit front end travel. Not overly though, or you'll have traction loss.

Index racing off a pro tree is really fun.

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post #11 of 16 (permalink) Old 06-24-2010, 09:28 AM
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I guess I missed it.

I didn't realize you were leaving on a pro tree. So, cancel my statement about that LOL! Since its a .500 pro tree watch the Top light of the 3 yellows.

Sometimes a minor change in tire pressure's in the front will help too. If I remember correctly to improve RT increase the front pressure a couple lbs, to decrease (If you are going red) lower the front pressure a couple lbs. Again, to see if it works you must stage consistantly each time.

We've pretty much covered it all on here but the bottom line is that it is the combination of the things discussed here and driving ability (Seat time) that will benefit you the most. Seat time will get you the consistancy you need.

Pro tree (.400-.500) Index heads-up is fun but it takes a lot of work with these cars.

Good luck with it and let us know how it works out.

Steve
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Cougar ET-Stock 4.6 shortblock/Stock PI headswap Bullitt NA 12.94 @ 105+
Nitrous 11.75 @ 114 MPH

2008 Ford Powerstroke 6.4 TT F250 4X4 Supercrew: 12.82 @ 105 MPH

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post #12 of 16 (permalink) Old 06-24-2010, 12:13 PM
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kdanner is right, limit the front end travel.
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post #13 of 16 (permalink) Old 06-24-2010, 10:05 PM Thread Starter
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Quote:
Originally Posted by kdanner View Post
Another thing to do would be limit front end travel. Not overly though, or you'll have traction loss.

Index racing off a pro tree is really fun.
Any ideas or links on how to limit the front end travel? I am a newb to that aspect.

Thanks for all the help.

Luke

96 v8 4.6 explorer, kooks headers, off road x, magnaflow mufflers, cl tb/plenum, lmaf, gt tube, xcal tune, alum shaft, 3800 dirty dog converter, darrin trans, 373 gears, hoosier slicks on fanblades, pbr brakes, Skinnies on front, No PS or AC, Aeromotive EWP, major weight removal (3380 LBS), 12.78 OLD COMBO.
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post #14 of 16 (permalink) Old 06-24-2010, 10:19 PM
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Quote:
Originally Posted by paintme205 View Post
Any ideas or links on how to limit the front end travel? I am a newb to that aspect.

Thanks for all the help.

Luke
A lot of info here... http://www.racetec.cc/shope/
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post #15 of 16 (permalink) Old 06-24-2010, 11:26 PM Thread Starter
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Thanks driller.

96 v8 4.6 explorer, kooks headers, off road x, magnaflow mufflers, cl tb/plenum, lmaf, gt tube, xcal tune, alum shaft, 3800 dirty dog converter, darrin trans, 373 gears, hoosier slicks on fanblades, pbr brakes, Skinnies on front, No PS or AC, Aeromotive EWP, major weight removal (3380 LBS), 12.78 OLD COMBO.
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post #16 of 16 (permalink) Old 06-30-2010, 06:45 PM
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i've only had 1 perfect .5 r/t with my stang had many close to perfects but only 1 perfect light.

my other ride is an ambulance!
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