60' time help

**Lunatikgixxer** · 04-03-2011, 04:04 AM

It seems like everything on my slip is good except my 60'. I dont know if im shifting too slow or what but i cannot get it under 2.3.... My best time in the 1/4 was a 13.2 on street tires.

**bills98ta** · 04-03-2011, 04:10 AM

LCA relocation brackets... They will help plant your tires !

**Lunatikgixxer** · 04-03-2011, 01:50 PM

ill have to do some more experimenting, it was on 4 runs and first time on that track.

**silverz28camaro** · 04-03-2011, 10:05 PM

I did the tq arm relocation bracket from bmr set 2 positions lower then stock, and trz anti roll bar, went 1.59 60' on 245 street tires

**silverz28camaro** · 04-03-2011, 10:06 PM

1.42 on mt et sreets 255

**pajeff02** · 04-04-2011, 03:10 AM

Did you drop your rear tire pressure at all? Even with street tires that can help a bit.

**Johnstonj2005** · 04-04-2011, 05:06 AM

I got my heavy goat to a 1.87 on crappy street tires. Are you a4 or m6?

**Lunatikgixxer** · 04-04-2011, 05:58 AM

Originally Posted by pajeff02

Did you drop your rear tire pressure at all? Even with street tires that can help a bit.

see ive heard the total opposite.... I think my pressure is right around 40psi.
Im running an m6 my suspension mods are an adjustable torque arm, lower control arms, sportline springs, rear qa1 adjustable shocks, subframe connectors.

**'02 WS6** · 04-04-2011, 07:55 AM

Originally Posted by Lunatikgixxer

see ive heard the total opposite.... I think my pressure is right around 40psi.
Im running an m6 my suspension mods are an adjustable torque arm, lower control arms, sportline springs, rear qa1 adjustable shocks, subframe connectors.

Air up the fronts to around 50psi to decrease rolling resistance. Doing the rears actually inflates the tire more so to the center of the tread and decreases the contact patch with the pavement by elevating the outsides of the tread. A lower psi, such as 21# softens the tire and places more contact patch between the road and tire. Any less than that though, and your adding the sidewall to the contact area which is bad.

**Johnstonj2005** · 04-04-2011, 07:59 AM

Are you dumping the clutch or slipping it? What rpm are you launching at?

**Firebirdjones** · 04-04-2011, 09:45 AM

Every car is going to be different. You'll have to experiment with rear tire pressures. Some use low air, some use higher.

I've found my cars like higher air pressure in the rear when running stock street tires. What you want is to have a nice even contact patch on the pavement. Do a short dry hop and look at the marks on the road. Pay close attention to how dark the marks are on the outside and inside,,,,adjust tire pressure accordingly. The weight you carry in the trunk of the car will play a role in this as well.
On stock rubber I always run some form of weight bias in the back. Some cars need it,,,some don't.

Suspension geometry is key. Setting the instant center with adjustable control arm mounting points, adjustable torque arms makes a huge difference. In stock form, most all production cars have the instant center way out in front of the car for better ride quality. You'll want to move that instant center rearward which aids in pushing the rearend housing into the ground and weight transfer.
A well setup rear suspension won't have the car squatting. Setup properly and in most cases you'll actually see some seperation from the body and the rear tires.

**Lunatikgixxer** · 04-04-2011, 10:36 AM

ok ill try to mess with the tire pressure. I slip the clutch out for a split second just to get the car moving then i dump it and it hooks up fine. I ran 2.3's launching at 3k-3.5k. I launched at 4k one time and ran a 2.1