Setting a Z06 up for Drag Racing ???
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Instructor
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From: Allen TX
Setting a Z06 up for Drag Racing ???
Anyone on here play with ride hight ?, sway bars ? or any other susp. tricks to get thier C5 to launch better....
So far my best 60' is 1.97, Im looking to hit 1.8's ( on DR's )
Any advise would be great.....
So far my best 60' is 1.97, Im looking to hit 1.8's ( on DR's )
Any advise would be great.....
Le Mans Master
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From: Lafayette Colorado
Re: Setting a Z06 up for Drag Racing ??? (GoldMember)
For weight transfer to the rear tires, removing the front swaybar will help. Also coilovers up front or HAL adjustable shocks will help also. The coilovers will give better weight transfer, but they also take longe to adjust.
Keith
Keith
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From: Allen TX
Re: Setting a Z06 up for Drag Racing ??? (kromberg)
Well i am going out to the track tonight to try a few things... I plan to remove the front sway bar, and raise the front up. I am not looking to replace any stock parts, just looking for ideas on what I can do with a "stock" setup to fine tune it for drag racing....
Pro
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Re: Setting a Z06 up for Drag Racing ??? (GoldMember)
changing the shocks and springs will do very little to affect weight transfer, and in fact softening them up in an effort to may just slow you down since you will spending energy compressing the suspension instead of going forward.
Yes, you read that right - body roll, suspension softness ARE NOT variables in the equations for weight transfer.
Center of gravity is though, thus raising the car up (front and rear) will help. Also set the rear camber near zero.
[Modified by jackmott, 5:34 PM 9/5/2003]
Yes, you read that right - body roll, suspension softness ARE NOT variables in the equations for weight transfer.
Center of gravity is though, thus raising the car up (front and rear) will help. Also set the rear camber near zero.
[Modified by jackmott, 5:34 PM 9/5/2003]
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From: Allen TX
Re: Setting a Z06 up for Drag Racing ??? (jackmott)
well I will try a few diffrent things tonight and post up the results and what worked best tomorrow..
so far here is my best on my current setup, BFG DR's, with front as low as it can go, and rear lowering bolts :
1.97 60'
5.01 330'
7.45 1/8 @ 101.7
Hopefully I can better those times..... :cool:
so far here is my best on my current setup, BFG DR's, with front as low as it can go, and rear lowering bolts :
1.97 60'
5.01 330'
7.45 1/8 @ 101.7
Hopefully I can better those times..... :cool:
Thread Starter
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From: Allen TX
Re: Setting a Z06 up for Drag Racing ??? (RWhite)
I have been going to Redline for the past few weeks, the track prep has been good, and I can usually get in on some good races. That is where i am going to tonight also. Which car were you in ?
Currently I am running a 150 wet shot, very conservative with timing and fuel, it actually makes right at 120 to the wheels.
[Modified by GoldMember, 5:54 PM 9/5/2003]
Currently I am running a 150 wet shot, very conservative with timing and fuel, it actually makes right at 120 to the wheels.
[Modified by GoldMember, 5:54 PM 9/5/2003]
Le Mans Master
Joined: Jan 2001
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From: Lafayette Colorado
Re: Setting a Z06 up for Drag Racing ??? (jackmott)
changing the shocks and springs will do very little to affect weight transfer,
Changing the shock and springs has a dramatic affect on weight transfer.
Keith
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Drifting
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From: mantua nj
Re: Setting a Z06 up for Drag Racing ??? (GoldMember)
i have over 300 passes on my z so far
and i can tell you that the sway bar removed will not help you at all...
my car is stock shocks and everything
i have many many 1.45-1.50 60 ft times
the set-up that will help you the most is a set of ccw's slicks & skinnies
hope this helps
brent
and i can tell you that the sway bar removed will not help you at all...
my car is stock shocks and everything
i have many many 1.45-1.50 60 ft times
the set-up that will help you the most is a set of ccw's slicks & skinnies
hope this helps
brent
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From: Allen TX
Re: Setting a Z06 up for Drag Racing ??? (brent eb02)
As of now, the BFG DR's are the most aggresive tire I am going to put on the car, I want to see how fast I can go with radials and full size tires on the front. At this point I am just reaching for every tenth I can get with suspension tricks.
[Modified by GoldMember, 6:00 PM 9/5/2003]
[Modified by GoldMember, 6:00 PM 9/5/2003]
Pro
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Re: Setting a Z06 up for Drag Racing ??? (kromberg)
No, it won't.
Weight transfer works like this:
WeightFront = (c/L)*W - (h/L)*M*a
WeightRear = (b/L)*W + (h/L)*M*a,
where h is the height of the CG, M is the car's mass and a is the acceleration
and b is the distance from CG to front axle, c the distance from CG to rear axle and L is the wheelbase.
From this alone, you would find that suspension stiffness and body roll have *nothing* to do with weight transfer, which isn't quite true, squat at the rear wheels will cause the CG to move slightly, which will then result in some different weight transfer results. This movement is rather slight however. You will notice Top Fuel dragsters don't bother with sqaut, or lifting the front wheels way off the ground. This looks cool but it really is wasting time and energy compression suspension components that could have been used to move forward.
The other poster in this thread getting 1.4 60fts with entirely stock suspension should be further evidence that there is little to be gained with coilovers/shocks for drag racing.
Weight transfer works like this:
WeightFront = (c/L)*W - (h/L)*M*a
WeightRear = (b/L)*W + (h/L)*M*a,
where h is the height of the CG, M is the car's mass and a is the acceleration
and b is the distance from CG to front axle, c the distance from CG to rear axle and L is the wheelbase.
From this alone, you would find that suspension stiffness and body roll have *nothing* to do with weight transfer, which isn't quite true, squat at the rear wheels will cause the CG to move slightly, which will then result in some different weight transfer results. This movement is rather slight however. You will notice Top Fuel dragsters don't bother with sqaut, or lifting the front wheels way off the ground. This looks cool but it really is wasting time and energy compression suspension components that could have been used to move forward.
The other poster in this thread getting 1.4 60fts with entirely stock suspension should be further evidence that there is little to be gained with coilovers/shocks for drag racing.
changing the shocks and springs will do very little to affect weight transfer,
:bs
Changing the shock and springs has a dramatic affect on weight transfer.
Keith
:bs
Changing the shock and springs has a dramatic affect on weight transfer.
Keith
Le Mans Master
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From: Lafayette Colorado
Re: Setting a Z06 up for Drag Racing ??? (jackmott)
Ok, so why do door slammers use a 4-link suspension? Why are all the 8.50 and 9.0 second f-body cars using drag stocks and suspension rather than stock?
Keith
Keith
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From: Corpus Christi TX
Re: Setting a Z06 up for Drag Racing ??? (GoldMember)
I've done exactly zero to my 02 Z06 suspension, besides running some kind tire. I've used stock fronts and 275/40 17" BFG in rear and cut 1.70 60fts. I've used stock fronts and 315/35 17" BFG in rear and cut 1.65. And I finally bit the pocket book bullet and bought the CCW et street/skinny setup and I've cut 1.62.
The 315 BFG were probably the best bang for buck (I had them 17X11 ZR1 rims and I got the set used for $600). If money isn't an "object", the CCW set is the way to go as you'll save 15-20 pounds, particulary off the front.
The 315 BFG were probably the best bang for buck (I had them 17X11 ZR1 rims and I got the set used for $600). If money isn't an "object", the CCW set is the way to go as you'll save 15-20 pounds, particulary off the front.
Pro
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Re: Setting a Z06 up for Drag Racing ??? (kromberg)
maybe to get the last .001 seconds off their times?
maybe because they are misled?
maybe not "all" of them do?
maybe the suspension design of an fbody allows for far greater squat and hence movement of the CG than a vette since the CG starts out higher and it has way more travel? (definitely!)
anyone with some adjustable shocks should be able to do a controlled experiment pretty easily.
10 runs, alternating soft/hard on the same side of dragstrip
see if there is any measurable difference.
maybe because they are misled?
maybe not "all" of them do?
maybe the suspension design of an fbody allows for far greater squat and hence movement of the CG than a vette since the CG starts out higher and it has way more travel? (definitely!)
anyone with some adjustable shocks should be able to do a controlled experiment pretty easily.
10 runs, alternating soft/hard on the same side of dragstrip
see if there is any measurable difference.
Ok, so why do door slammers use a 4-link suspension? Why are all the 8.50 and 9.0 second f-body cars using drag stocks and suspension rather than stock?
Keith
Keith
Drifting
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From: Oakhurst NJ
Re: Setting a Z06 up for Drag Racing ??? (GoldMember)
Sounds like you just need a little practice with the car. I have the CCW setup and stock suspension lowered as much as the stock bolts go and I have no problem getting 1.53-1.57s everytime on a crappy track. I've seen many people get low 1.6s with drag radials, you just gotta know how to slip the clutch.
Safety Car
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From: Insert Wittty Comment here
Re: Setting a Z06 up for Drag Racing ??? (kh24)
I cut 1.7 60's on my stock radials and 1.6's on ET Streets. I lowered the car a bit which softened the rear up a bit. What RPM are you leaving at? There are several folks that are stock with DR's getting 1.7 60' times.
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From: Allen TX
Re: Setting a Z06 up for Drag Racing ??? (kh24)
I admit I need more seat time to get it right, but a 1.6x seems next to impossible for me :eek:
Im shooting for 1.8x and if I hit that mark I will be very pleased.
Any recomendations for tire pressure on BFG 315/35/17 DR's on 17x10.5's
currently I run about 18-20 psi.
Im shooting for 1.8x and if I hit that mark I will be very pleased.
Any recomendations for tire pressure on BFG 315/35/17 DR's on 17x10.5's
currently I run about 18-20 psi.
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From: Allen TX
Re: Setting a Z06 up for Drag Racing ??? (J-Rod)
I leave at about 3K RPM and slip the clutch, it has very little tire spin that way, and I can get on the N2O about 45-50 feet out.
Othen than N2O its close to stock, just exhaust and intake. 385 rwhp on motor
Othen than N2O its close to stock, just exhaust and intake. 385 rwhp on motor
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From: Allen TX
Re: Setting a Z06 up for Drag Racing ??? (kh24)
Yes, I do pretty much exactly that, let em smoke for about 2 to 3 seconds, entire process takes about 6 or 7 seconds of burnout time.....