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

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Old 09-29-2012, 07:11 PM   #1
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? about drop springs at the dragstrip

i've been running drop spring on my car sense 2009 when i got the car . i started modding in the winter of 09 & i've been pushing 650+ rwhp with a D1 procharger through a stalled auto ever sense . i've ran a best of 10.78 et @ 127 mph with a 1.58 60' . i've never ran my car with the stock springs , so my question is . are the drop springs holding me back compaired to the stock springs . thanks for any info you can provide
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Old 09-29-2012, 07:23 PM   #2
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guessing no. different spring rate aside...shorter spring = less "squat".
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Old 09-30-2012, 09:05 AM   #3
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You're obviously hooking up pretty well with your setup.

We have many members running real fast times with drop springs. But I can pretty much gaurantee these same cars would run faster without them. Drop springs are not the best setup for drag racing.

My guess is your 60' times would drop down in the 1.4x range with a more specific drag setup. GM High Tech even did a drag test swapping out a set of lowering springs with drag specific springs (springs made for drag racing) and the car's 60' times dropped nicely (down into the 1.4x sec range).
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Old 09-30-2012, 10:42 AM   #4
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I think drop springs will always be better than stock, but there are better set ups.
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Old 09-30-2012, 05:41 PM   #5
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i would say that if you have stock suspension, that would be more of a set back than the springs. The newer camaros have the advantage of better durometer rubber bushings. nothing that BMR or any of the other suspension companies couldn't help you out with
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Old 09-30-2012, 06:23 PM   #6
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thanks guys . heres somemore info

i've got bmr lowers , adj. toelinks & trailing arms along with the jre posi mod and 17" mickey dr . i'm thinking that i maybe loosing some of the weight transfer due to the shorter springs . what do you guys think or am i just over thinking ? i think the car has more in it then a 10.78 with the current setup .
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Old 09-30-2012, 06:41 PM   #7
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Lowering springs are not ideal for drag racing but neither are the stock springs. There is definitely no reason to swap back to stock. If you want the optimal set up you should be looking at a set of drag race coil overs. That alone should knock a solid tenth of your 60ft.
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Old 09-30-2012, 06:41 PM   #8
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thats probably as good a setup as you can run. i would add diff and cradle bushings but thats a good 60' time already. probably get it down to a 1.50
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Old 10-01-2012, 09:52 AM   #9
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thanks guys . heres somemore info

i've got bmr lowers , adj. toelinks & trailing arms along with the jre posi mod and 17" mickey dr . i'm thinking that i maybe loosing some of the weight transfer due to the shorter springs . what do you guys think or am i just over thinking ? i think the car has more in it then a 10.78 with the current setup .
The lowering springs can kind of be a double edged sword. The springs lower the car which makes it a little harder to transfer weight in the front but they have a bit stiffer spring rate which helps keep pressure on the rear tires. With the power your car makes it shouldn't have any problems transferring weight which is pretty clear from the 1.58 60ft times you have. It really sounds like you are doing a good job of maximizing your setup.

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thats probably as good a setup as you can run. i would add diff and cradle bushings but thats a good 60' time already. probably get it down to a 1.50
I agree 100%. Adding these two parts would definitley help out with the 60ft times and make the car more consistent.
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Old 10-02-2012, 04:49 PM   #10
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You have a good working set up, beside the suspension upgrade mention above. Gears and or loosening your convertor might help your ProCharger get into the power band a little quicker. Good luck and Keep us posted.
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Old 10-02-2012, 07:36 PM   #11
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my mind of thinking would be , shorter spring less movement , so the car would be stiffer and cause it to spin a bit more easier , softer taller springs would be almost the same effect as a 20" tire vs a 17" . i could be wrong tho .
but u drive the hell out of that car ,
just thought of something tho , the last 1/8 u probably gain a very lil vs stock cause of the uplift and being lower to the ground so not having as much air to cut thru. but they would be very minimal .
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Old 10-03-2012, 04:57 PM   #12
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Lowering springs are not ideal for drag racing but neither are the stock springs. There is definitely no reason to swap back to stock. If you want the optimal set up you should be looking at a set of drag race coil overs. That alone should knock a solid tenth of your 60ft.
chase what drag shocks ( full set front & rear ) would you suggest for my 4000 lb pig ?

thanks guys for all your thoughts .

i'm looking to maximize my current set up for now . then a forged bottom end after that .
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Old 10-03-2012, 07:29 PM   #13
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If your going to do anything, drag coilovers would be your best gain. Don't even bother with stock springs, your better off with the drops in the rear and stock in the front though. The stockers would help weight transfer and lift to the rear, and the drop springs in the rear would help keep it planted. The rear of this car squats to much with stock suspension without enough front end lift.
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Old 10-04-2012, 07:34 AM   #14
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Try disconnecting or removing the front sway bar and set the rear sway bar at it stiffest setting.
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Old 10-04-2012, 06:47 PM   #15
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chase what drag shocks ( full set front & rear ) would you suggest for my 4000 lb pig ?

thanks guys for all your thoughts .

i'm looking to maximize my current set up for now . then a forged bottom end after that .
Pfadt Drag Race coil overs. We have what is believed to be the only new set left in existence.

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Old 10-05-2012, 12:03 PM   #16
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Pfadt Drag Race coil overs. We have what is believed to be the only new set left in existence.

Those are sweet.
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Old 10-05-2012, 12:16 PM   #17
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I ran my best times with drop springs.
I have coilovers now and the ride is so much better.

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Old 10-06-2012, 05:41 AM   #18
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Those are sweet.
It is a shame they are hidden underneath the car. The good news is that they function as great as they look.
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Old 10-08-2012, 10:01 AM   #19
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Try disconnecting or removing the front sway bar and set the rear sway bar at it stiffest setting.
PLEASE DONT!! this could be dangerous and isnt the way to go.This is IRS the old straight axle tips dont work with irs
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Old 10-09-2012, 01:47 PM   #20
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Originally Posted by 1 BAD RS 2 SS View Post
i've been running drop spring on my car sense 2009 when i got the car . i started modding in the winter of 09 & i've been pushing 650+ rwhp with a D1 procharger through a stalled auto ever sense . i've ran a best of 10.78 et @ 127 mph with a 1.58 60' . i've never ran my car with the stock springs , so my question is . are the drop springs holding me back compaired to the stock springs . thanks for any info you can provide
I think the drop springs vs. OEM spring difference would be marginal at best. Your 1.5 60FT is pretty good honestly. The thing I like about the centrifugal superchargers is they allow you to get out of the hole without blowing the tires off. There are however much better set ups that are specific to drag racing.

The best possible set up is a stiff rear spring/sway bar and a soft front set up on an IRS car. We've been setting up Vette's this way for years and I've had the pleasure to help set up a few of the fastest in the country.

The stiff rear spring/damping/sway keeps your camber/toe setting as close to zero as possible which helps to maintain contact surface. The front end needs to lift to transfer the weight to the rear and this can be done with a longer/softer front spring. We've also disconnected the front sway to allow the front end to lift more efficiently; I only recommend this for drag specific set ups and not on the street.

The other important pieces on the 5th Gens are sub-frame mounts, rear upper control arm bushings, trailing arms and toe links along with diff bushings for the higher HP applications. We have our 5th Gen A6 running 10.83 @ 128 with a 5000+ DA; we're at 4500FT.. Our 60fts are 1.4 to 1.5 consistently on a substandard track with 20" drag radials.

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PLEASE DONT!! this could be dangerous and isnt the way to go.This is IRS the old straight axle tips dont work with irs
The IRS actually benefits more from this type of set up than a straight axle. It is important to maintain camber and toe in the rear for a few reason. The first is contact patch and we don't need any explanation there; more rubber = more traction. The next thing is efficiency; if you've got toe in or out you're losing forward drive and compromising traction. This is only achieved by having the rear set up stiff. You need to transfer weight so you have to utilize the front end lifting for this; it can been done leaving the sway connected but disconnecting it allows the front end to pick up faster. The trick is using a softer/longer spring up front to help promote lift with a soft damping setting.

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Jordan Priestley
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Old 10-09-2012, 07:19 PM   #21
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I think the drop springs vs. OEM spring difference would be marginal at best. Your 1.5 60FT is pretty good honestly. The thing I like about the centrifugal superchargers is they allow you to get out of the hole without blowing the tires off. There are however much better set ups that are specific to drag racing.

The best possible set up is a stiff rear spring/sway bar and a soft front set up on an IRS car. We've been setting up Vette's this way for years and I've had the pleasure to help set up a few of the fastest in the country.

The stiff rear spring/damping/sway keeps your camber/toe setting as close to zero as possible which helps to maintain contact surface. The front end needs to lift to transfer the weight to the rear and this can be done with a longer/softer front spring. We've also disconnected the front sway to allow the front end to lift more efficiently; I only recommend this for drag specific set ups and not on the street.

The other important pieces on the 5th Gens are sub-frame mounts, rear upper control arm bushings, trailing arms and toe links along with diff bushings for the higher HP applications. We have our 5th Gen A6 running 10.83 @ 128 with a 5000+ DA; we're at 4500FT.. Our 60fts are 1.4 to 1.5 consistently on a substandard track with 20" drag radials.

Kind regards,

Jordan Priestley
888.308.6007
whats your car set up consist of to achieve the 1.4 60's ? is it a full on drag set up or is it a street / strip set up ? i usually trailer the car to the track , so no long drives . just around town on the weekends for now if thats what it takes to improve my set up . you can PM me if thats better for you .
thanks
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Old 10-09-2012, 07:26 PM   #22
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Last I spoke with Graham from LPE the three fastest IRS 5th Gens were all on Lingenfelter Dedicated Drag Coilovers. Call LPE and speak with Graham or Jason. They will get you hooked up with the good stuff.
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