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Dragstrip and Launch Techniques Discussion 1/4 mile, 1/8 mile, launch discussions.

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Old 11-11-2013, 11:18 PM   #1
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Front runners, how much faster?

So I am considering front runners for next year. Does anyone know what the gain is from front runners alone? I was thinking almost 2 tenths since the 20s are so freaking heavy! Anyone have some before and after?

Thinking 17" race stars with a 215/70 passenger tire. 28.9 tall that matches my rear height. Or 215/65 those are 28". They make these for mini vans and they are cheap!!
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Old 11-12-2013, 07:08 AM   #2
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Yeah 1-2 tenths
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Old 11-12-2013, 08:25 AM   #3
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wow...if that can gain 2 tenths i might have to pick some up!
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Old 11-12-2013, 08:42 AM   #4
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vs stock weight. Your nurburgrings are quite a bit lighter than OEM. You still see a weight drop, yes...but you will still also see a better drag coefficient for the front rollers. I still would bet you would see a tenth...maybe still 2...never can tell. Dropping rotating mass front and rear will show measurable gains at the track given exact same conditions.
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Old 11-12-2013, 09:50 AM   #5
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Mike I had 20x9./275's up front and they were like 68 lbs I think. I think front runner + bias ply M&H is 31 or 35 lbs?

If you do a street radial up front maybe 40 lbs? I'm sure Sux2 will have some #'s.
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Old 11-12-2013, 09:57 AM   #6
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I gained nothing in ET but it kept me from smashing into that wall at 130 mph because slicks with the radials up front was a recipe for disaster.
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Old 11-12-2013, 10:38 AM   #7
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I would say a tenth or maybe a little over.
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Old 11-13-2013, 09:13 AM   #8
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I gained nothing in ET but it kept me from smashing into that wall at 130 mph because slicks with the radials up front was a recipe for disaster.
why would that be an issue? can you not mix radials and slicks?
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Old 11-13-2013, 09:28 AM   #9
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why would that be an issue? can you not mix radials and slicks?
You can have radials in the back and bias-ply up front, but not the other way around. It's dangerous.....so I've been told!!!
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Old 11-13-2013, 10:28 AM   #10
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You can have radials in the back and bias-ply up front, but not the other way around. It's dangerous.....so I've been told!!!
I have done it, yes it's not a good match! I don't think it's to bad on slower cars, my olds ran 11s and it just felt unstable on the top end. If it trapped any higher I would have removed the radials in the front. I only had it like that for one season, I won't ever do that again either.
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Old 11-13-2013, 10:29 AM   #11
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I've done it, our cars are kinda slow i don't see it being a big deal.
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Old 11-13-2013, 11:13 AM   #12
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ya cause it does this.
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Old 11-13-2013, 01:13 PM   #13
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ya cause it does this.
OUCH!!!! That's gotta suck!!!!
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Old 11-13-2013, 01:42 PM   #14
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ya cause it does this.
Looked to me like that white car was breaking traction in several places then probably lost control after getting back into the gas. Typically running slicks out back and radials up front isn't gonna matter in that short of time and speed they were going. I ran them on my 67 Camaro up to 130 but yes it got very squirrelly on the top end. I eventually changed to bias on fronts.
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Old 11-22-2013, 08:58 AM   #15
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Isn't Amanda's car a ZL1 with 285/35's up front? Way more front grip than anything you can reasonable fit under the front of any older car, so the car will be even more likely to swing the tail back and forth around its stuck-down front end.


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Old 11-22-2013, 01:13 PM   #16
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I've seen that video before, I'd want to know a lot more before I'd even start to point fingers at running radials up front and slicks in back. I see folks do it at the track all the time. I have done it too with past cars.

So that vid, is that an arm drop deal on a runway or street?

Other potential factors:

-Car wasn't hooking early on, why
-Stick or auto?
-Is that a road or runway? How hot was it?

We ran a low 7 second class car in a 1/2 mile event and pulled 60% of the power out of it to get it down the runway. The car would lose traction going over high and low spots on the runway that you'd never have on a drag strip.

Lots of reasons why that could have happened.
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Old 11-22-2013, 01:17 PM   #17
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I've done it, our cars are kinda slow i don't see it being a big deal.
On your car it's not a big deal. You're right, it's slow. 130+ mph it starts to get sketchy.

Most of the gen v's are fine with a dr on the back to begin with. I'm going back to one.
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Old 11-22-2013, 01:39 PM   #18
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I've gone 145mph with a YSI in the past with radials up front and slicks out back.

Those who have run slicks before know a car handles a lot different with slicks in the back aired down to 12 psi.
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Old 11-22-2013, 02:13 PM   #19
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I changed from stock 20's to 18" drag radials and 18" skinny's at the track and only picked up .12 in et and 1 mph. From 12.12 @ 114 to 12.00 @ 115.
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Old 11-22-2013, 02:14 PM   #20
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I've gone 145mph with a YSI in the past with radials up front and slicks out back.

Those who have run slicks before know a car handles a lot different with slicks in the back aired down to 12 psi.
4200 lb car? Big difference than a 3k lb f body.
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Old 11-22-2013, 02:25 PM   #21
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I changed from stock 20's to 18" drag radials and 18" skinny's at the track and only picked up .12 in et and 1 mph. From 12.12 @ 114 to 12.00 @ 115.
^^ this is what I guessed.
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Old 11-22-2013, 02:27 PM   #22
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^^ this is what I guessed.
I could see a tenth. That's believable.
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Old 11-22-2013, 03:30 PM   #23
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her car is a auto. it runs 10.5 consistantly with 10.4x fastest pass so far. its was a runway. ya the armdrops . it was hot as hell out that day probably close to 100. usally hit speeds of mid 90's in my car. ya she lost traction early but , that setup when u get sideways causes problems . to much bite. but the track is bumpy as hell and thats what broke it loose i think. but it was also her first pass on that tire setup.
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Old 11-22-2013, 05:03 PM   #24
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OP back to your question back in March I ran my best 10.87. ON stock wheels in front and 18x11 with M/T in rear with 3.45 gears. Temp in the low 60s high 50s. Last month in the same temp ran a 10.57. With 17" all 4 corner skinny and slicks also a 3.91 rear gear. How much was gear or wheels I don't know between the two I cut .30th off my time
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Old 11-22-2013, 05:28 PM   #25
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her car is a auto. it runs 10.5 consistantly with 10.4x fastest pass so far. its was a runway. ya the armdrops . it was hot as hell out that day probably close to 100. usally hit speeds of mid 90's in my car. ya she lost traction early but , that setup when u get sideways causes problems . to much bite. but the track is bumpy as hell and thats what broke it loose i think. but it was also her first pass on that tire setup.
..Bumpy runway
..First time on those tires
..100F out

All of the above plus the runway getting greasy from the heat caused that problem. You could see her car kick out at least once, that would or should never happen on a real drag strip.

Our experience with running on a runway is that they were nowhere near as smooth as a track, and the car lost traction several times just from the bumps.

Hope she came back from that accidents suck.
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