First time at the track since moving back to the states

[rcm90]

The first pass of the night is the pic posted. The other three runs were mid 1.9x 60' with 1/8 times around the 8.70s at 81-82 and 1/4 times in the high .30's at 106. All runs were on an upprepped track and the da was around 3800ft.

The car is a 2010gt with an o/r x, jlt cai tune, some way too stiff springs and bald pirelli p zero's.

 

[rcm90]

Yesterday I took the car back to the track after putting on qa1 coil overs with 12-150 springs on the front and a front sway bar delete from BMR. On the rear I have 10-200 coils with strange 10way adjustable shocks, BMR sway bar relocation kit, BMR LCA relo brackets, UPR pro street LCA and UCA's with 26x10 stiff wall Mickey Thompson's.

Pulling up to the water box I did just a real light 1st gear burnout, staged held it at 5800 and threw away the clutch for the car to DEAD hook and bog under 2500rpm resulting in a 1.84 60'.

The second pass I stiffened up the front struts to full hard and left the rear set to 5 and raised the t.p. from 15 to 17.5psi, did the same burnout, revved it to 6600 and threw away the clutch for it again to dead hook and bog to about 2800 resulting in a 1.80 60'.

Obviously the suspension is working, but its working too well and I've never had that problem before.. Any recommendations? The car has a 3.73 gear and I honestly don't think a 4.10 will make a difference.


Edit: The relocation brackets were at the middle hole and the track was not being prepped when the runs were made.

 

[CPRsm]

You can try a bit more tire pressure or bringing the back of the arm up and see if tou can get more tire speed. Can always raise the launch rpm. Doesn't need to be there long.

 

[rcm90]

You can try a bit more tire pressure or bringing the back of the arm up and see if tou can get more tire speed. Can always raise the launch rpm. Doesn't need to be there long.

What would be the highest you would go on a slick, 20psi? I was thinking of raising the limiter to 7200 or so but Im really afraid of breaking something since its hooking so violently.

Ehh.. I guess I need to finish the turbo kit for it.

 

[CPRsm]

20 isn't bad for a slick. More stable up top, but w less foot print. 7200 won't be bad unless maybe a stock engine? It may get more violent, but only until the point where unhit the tires hard enough to spin them. That's the shitty part about a stick.

 

[Scottcba1]

Maybe try dropping to tire pressure some while leaving the rest of your setup the same and see how that helps. I tend to run DRs and full slicks less then 15psi depending on track conditions etc. Raising the launch RPMS (as mentioned earlier) will help with the bog as well as long as the suspension/tires can handle it.

Keep us informed of how you make out!

-Scott

 

[rcm90]

Its a stock engine/trans car that I'm trying to have some fun with until I build the new engine and get the turbo kit together. In my old fox I ran the slicks at 12.5lbs but the car would go 9.60's so it had plenty of power to blowoff the tires off in 1st gear. I'm going to try moving the lca up and set the tires at 20lbs.

I did test the car on the street with the tires set at 15lbs.. and it hooks great from 6100 if I just scratch the tires before hand. So that did make me feel a little better. BUT before I can go make changes I've got to take out my passenger lca and check the bolts and bolt holes something is rattling around. I think a hole was elongated.

 

[rcm90]

Here it is on the M/T's.

I ran across a set of skinnies for the front, but still am waiting for rubber.

Then if the car will not stop dead hooking, I will have to throw this guy on the stock motor to get the job done.

 

[Mike K]

You could always try slipping the clutch just a little to prevent the huge bog.

 

[lindertw]

Are you using the stock UCA bracket, or one with a second adjustment hole? Where is the UCA mounted (if multiple holes).

What is your pinion angle set to?

by way of comparison, I have an '05 with 300 rwhp, 5spd stock clutch/shifter/trans, strange single adjustable struts/shocks, and cobra jet springs. metco UCA and LCA's and BMR relocation brackets, front swaybar delete with lightweight rad support in place, 4.10 gears and eaton truetrac diff.

LCA's set to uppermost hole on BMR reloc brackets
UCA set to uppermost hole on UCA bracket (similar to stock configuration)
pinion angle set to -2.5 deg

17" M/T et street bias ply rear tires set to 18psi
~5000 rpm launch
first time out on the 1/4 with struts/shocks set to +6 at all corners (incorrect, I know) I ran the time in my sig.

what is your ride height with your current springs (floor to fenderwell arch)? I wonder if you need more tire pressure in the slicks, and move the LCA's to the uppermost hole on the BMR reloc brackets. (caveated with I'm still learning and don't know what I don't know!!)

 

[rcm90]

No, I'm currently using the UPR UCA bracket and it has one hole.

Honestly I have no idea where my pinion angle is set currently. Both upper and lower control arms are double adjustable and I have them set to the same length as their stock counterparts. I will be replacing all the rear suspension in a day or two with BMR rod end control arms, so I will make sure its where it needs to be after I install them.

On the stock Pirelli's which are 27.1", the front sits at 27.75" from the ground to the fender well arch and the back sits at 28". So im guessing with the slicks on its around 27 1/4" to 27 1/2" in the back.

If I stop being lazy I'm going to redo the rear suspension and move the lca to the top bolt hole, change the spring on the front from a 12-150 to a 14-200 and finally try more tire pressure.

I'm about to steer away from a slick and go to a M/T ET street so I can actually drive it legally to the track or not have to switch out tires at the track.

My car did go a 12.89@105 trapping in third gear. Once I make the trek from Ohio to New Mexico, ill throw a 4.10 or 4.30 in it to see what happens.