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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, 03:27 PM   #1
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Riding high in the back?

I feel like my car is high in the back. I have some weight out but nothing crazy, car is overall maybe 200-240 lbs than stock.

Anyone see how much gap I have between the tires and the body?

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Old 11-11-2013, 03:53 PM   #2
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Quote:
Originally Posted by Pro Stock John View Post
I feel like my car is high in the back. I have some weight out but nothing crazy, car is overall maybe 200-240 lbs than stock.

Anyone see how much gap I have between the tires and the body?

Yup, Supercars will help... Lower the whole thing...
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Old 11-11-2013, 06:33 PM   #3
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Mine sits about there. There is a measurable HP difference at different ride heights due to the CV axles having to work harder if the car is super low. We actually tested this on a dyno - you'd be shocked, really. 12hp difference with the axles level vs the car slammed to the ground and the axles canted. Needless to say I've been setting rear ride height by axle angle ever since.
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Old 11-11-2013, 07:16 PM   #4
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13.15@106 1.95 | 100% Stock
12.37@112 1.85 | Headers, Cats | 555R DR | CAI | UDP | Tune
12.06@113 1.70 | +NT05R 18s | + Circle D 3200
11.90@112 1.60 | + 3.91s | +Race Star 17x7s
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Old 11-11-2013, 07:17 PM   #5
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PROJECT HEAVY CHEVY: 2010 Camaro SS/RS |Mods for the Masses Articles
13.15@106 1.95 | 100% Stock
12.37@112 1.85 | Headers, Cats | 555R DR | CAI | UDP | Tune
12.06@113 1.70 | +NT05R 18s | + Circle D 3200
11.90@112 1.60 | + 3.91s | +Race Star 17x7s
Mods: GPI Tune | Bo's PTB | Kooks LTs | Hooker Maxflows | Circle D 3200 | New Era OTR | RCR AirRam Manifold | Powerbond UDP | 3.91s
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Old 11-11-2013, 07:41 PM   #6
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Quote:
Originally Posted by toNspahreP View Post
Mine sits about there. There is a measurable HP difference at different ride heights due to the CV axles having to work harder if the car is super low. We actually tested this on a dyno - you'd be shocked, really. 12hp difference with the axles level vs the car slammed to the ground and the axles canted. Needless to say I've been setting rear ride height by axle angle ever since.
Now that.....is good information!
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Old 11-11-2013, 07:44 PM   #7
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I'm not looking to go super low and slam the car but I will have to lower it, car is visually so raked that has to be affecting weight transfer.

Nspar, Are the COPO front struts different, more extension? Jeff mentioned that the other day I found that interesting.
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PROJECT HEAVY CHEVY: 2010 Camaro SS/RS |Mods for the Masses Articles
13.15@106 1.95 | 100% Stock
12.37@112 1.85 | Headers, Cats | 555R DR | CAI | UDP | Tune
12.06@113 1.70 | +NT05R 18s | + Circle D 3200
11.90@112 1.60 | + 3.91s | +Race Star 17x7s
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Old 11-11-2013, 08:35 PM   #8
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Is that picture from today? In the mid 80's down here!
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Old 11-11-2013, 09:06 PM   #9
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John, I just looked at mine with 305/45R18 MTs on the rear and it looks just as high as yours. My tires are about wore out, but as best I could measure about 2-1/2" to 2-3/4" from wheel well to tire. I have not removed any sprung weight from my car, but gas tank is only about at 1/4.

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Old 11-11-2013, 09:42 PM   #10
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Now that.....is good information!


John, I lowered mine (BMR) and love the look, but once I did, I lost 60-foot time until I also ditched the front sway. Seems to help weight transfer.

But now I'll be checking the axle angle as suggested above with my new 9" DSS, which is going in as I type.

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Old 11-11-2013, 09:43 PM   #11
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I'll have to measure but I definitely have to lower this car, and the rake has got to go.
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13.15@106 1.95 | 100% Stock
12.37@112 1.85 | Headers, Cats | 555R DR | CAI | UDP | Tune
12.06@113 1.70 | +NT05R 18s | + Circle D 3200
11.90@112 1.60 | + 3.91s | +Race Star 17x7s
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Old 11-11-2013, 10:26 PM   #12
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My car has a rake to it also, but on launch it dips in the rear and the front lifts some. I removed the sway bar...seems to have helped. I would think level and stiffer in the rear would help. Have you thought about running a rear drag bar? I was thinking 1" lowering springs and a drag bar in the rear for mine. I actually think mine dips to much and is wasting energy that could be put to the ground.
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Old 11-12-2013, 12:27 AM   #13
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Quote:
Originally Posted by Pro Stock John View Post
I'm not looking to go super low and slam the car but I will have to lower it, car is visually so raked that has to be affecting weight transfer.

Nspar, Are the COPO front struts different, more extension? Jeff mentioned that the other day I found that interesting.
The extension is much longer vs the factory strut, but thats not what makes them work. It's the fact that they use a 16" coil spring. I dont have one sitting in front of me, but I'd put the factory spring at 7-8 inches? Even if the front struts would travel farther then they do, you wouldnt have any spring pushing the car up, which limits front end lift. The 16" spring pretty much pushes the front all the way up when you launch, maximizing weight transfer to the back. The 11-12s had a 14" 150lb spring, but the 13-14 copos have a 16" 125lb spring, as it improved weight transfer and generally helped the cars 60 foot. Took some digging and waiting to get into contact with the right guy at strange, but finally dug out the spring info a month or two ago.



"
Strange Engineering <strangeeng1@ameritech.net>




to me

The latest ones use a 16” 125lbs spring. The front brake kit is available thru MPR Race cars. The front spindle needs to be modified for the kit to work and he has done all of those modifications.


Part number for the springs is SP16125A. They are sold as each so you will need 2 of them. Thanks

Jim Buschman
Assistant Sales Manager|Strange Engineering"
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Old 11-12-2013, 12:28 AM   #14
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And from MPR

I can build the front drag race Strange brakes using your Camaro spindles and hubs. The both need to be machined and I also have the brakes in stock. If you ship the spindles and hubs to me I can ship them back with the brakes installed for $1000, this includes spindle and hub modifications and assembly, shipping is not included. You also need to modify the brake pedal assembly to eliminate the power brake booster. Using your pedal assembly the COPO style kit including the master cylinder and firewall brace (just like the COPO) would cost $400. Normal assembly time frame would be about a week but my shop will be closed now until Oct 28th. Let me know if you are interested in any or all of these parts. Strange does not have a vented rotor kit developed for the new Camaro yet and I'm not sure they have any plans to do so. If the brake pedal and master cylinder id done properly I think this brake system would work good for light street use. Thanks!

Mike Pustelny @ MPR



So these aren't quite shelf parts, other then the struts/springs, but they're available if you dig deep enough.
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Old 11-12-2013, 12:41 AM   #15
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John, I lowered mine (BMR) and love the look, but once I did, I lost 60-foot time until I also ditched the front sway. Seems to help weight transfer.

But now I'll be checking the axle angle as suggested above with my new 9" DSS, which is going in as I type.

Padre

I used an angle gauge from the centerline of the axle.
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Old 11-12-2013, 08:09 AM   #16
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I put my stock 20's back last night and measured the gap like Jeff Brown. I'm 2.5 inches in back and 2 inches up front. So I'm guessing I can do a 1.0 front/ 1.5 rear drop kit like from BMR.

Rake is okay if the car is set up for it and mine is not. Mike if you ditched the front sway bar you get more extension up front as the car isn't as strapped down. I have done that in the 4th gen days, but hadn't gotten there with this car.

Nspar, so the different springs up front require drag shocks?
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PROJECT HEAVY CHEVY: 2010 Camaro SS/RS |Mods for the Masses Articles
13.15@106 1.95 | 100% Stock
12.37@112 1.85 | Headers, Cats | 555R DR | CAI | UDP | Tune
12.06@113 1.70 | +NT05R 18s | + Circle D 3200
11.90@112 1.60 | + 3.91s | +Race Star 17x7s
Mods: GPI Tune | Bo's PTB | Kooks LTs | Hooker Maxflows | Circle D 3200 | New Era OTR | RCR AirRam Manifold | Powerbond UDP | 3.91s
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Old 11-12-2013, 09:07 AM   #17
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Quote:
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I used an angle gauge from the centerline of the axle.
Question: what angle are you shooting for at rest? Level?

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Old 11-12-2013, 01:36 PM   #18
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I can tell you John that removing the sway definitely helped! As far as street driving I don't even notice is gone, other then the front end coming up higher on the gas.
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Old 11-12-2013, 01:46 PM   #19
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I pulled an endlink off my front sway this weekend. Much easier to launch and be consistent...and from the vid you can see the nose come up more. On the street it is VERY noticeable at turn in that it is missing. I have Pfadt upgraded sways though.
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Old 11-12-2013, 01:47 PM   #20
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Yeah I was surprised when someone said they couldn't notice a difference without a front sway bar lol

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Old 11-12-2013, 02:21 PM   #21
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I put my stock 20's back last night and measured the gap like Jeff Brown. I'm 2.5 inches in back and 2 inches up front. So I'm guessing I can do a 1.0 front/ 1.5 rear drop kit like from BMR.

Rake is okay if the car is set up for it and mine is not. Mike if you ditched the front sway bar you get more extension up front as the car isn't as strapped down. I have done that in the 4th gen days, but hadn't gotten there with this car.

Nspar, so the different springs up front require drag shocks?

Yes, they require the narrow body strange S2063 coilovers, it's what they were designed around by strange.


Quote:
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Question: what angle are you shooting for at rest? Level?

Padre
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Old 11-12-2013, 02:21 PM   #22
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i took my sway bar off and i cant tell much diff. but stock 10 bar on mine. i can tell a lil bit but not much. i dont road raceor anything tho.
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Old 11-12-2013, 02:32 PM   #23
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Been a while since I've had the hood come up, I got pretty used to that over the last 15 years...

2000:


2001


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PROJECT HEAVY CHEVY: 2010 Camaro SS/RS |Mods for the Masses Articles
13.15@106 1.95 | 100% Stock
12.37@112 1.85 | Headers, Cats | 555R DR | CAI | UDP | Tune
12.06@113 1.70 | +NT05R 18s | + Circle D 3200
11.90@112 1.60 | + 3.91s | +Race Star 17x7s
Mods: GPI Tune | Bo's PTB | Kooks LTs | Hooker Maxflows | Circle D 3200 | New Era OTR | RCR AirRam Manifold | Powerbond UDP | 3.91s
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Old 11-12-2013, 03:27 PM   #24
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I can tell its not there if I push a turn a bit harder, but nothing that would make me reinstall it. Putting aroun town I can't even tell.
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Old 11-12-2013, 03:48 PM   #25
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its def worth takin it off if u like straight line stuff. i can tell a big diff on the front end lift onmine
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