Alright, I've been to the track 6 times and I'm starting to get addicted.

On my 3rd visit, I pulled a 1.98 60' on Nitto 555Rs by doing a 3K drop/launch.

My fourth time was on Nitto 555Rs, I pulled a 13.05 personal best. This is in an M6 with at the time BFGoodrich street tires.

Every time since I've been getting worse. So I've started upgrading suspension/chassis parts to hopefully help...nothing yet.

What I've got so far:
Rear lowering springs (~2 honest inch drop), but I kept my stock springs in case I needed to switch back. I'm strongly considering it becaue of my new 26/10/15 MT ET Drags are about 1" from the fender.

With street tires (BFGoodrich again) on my 6th visit recently, I could only pull a best of around 2.45ish 60'. SUCKED!!!

I've upgraded my LCAs with some boxed ones with poly bushings.
I've upgraded the PHR with a single adjustable BMR and I measured the tire to fender side clearances so the rear appears centered.
Running stock T/A.
I've got Eibach Prokit springs for the lowering mentioned above.
I think my shocks are dead front & rear.
I've got stock front springs around those shocks I think are dead.
The wheels for the BFGs are stock chrome snowflakes (weigh in @ 47#)
The wheels when using the Nitto 555Rs are the 5-spoke painted Camaro wheel (running ~43#)
The M/Ts I've got & not used yet (spacing issue still-grind the calipers more!!!) run 41# each on 15x8 Weld Draglites.
I've removed the front sway bar (worked out to 15# with all 10 bolts).

When I launch, I've got the linelock set (thumb release) and I have the engine typically between 1500 & 2000 rpm. My reaction varies between .550 & .750.

I've got dyno tested 319.x RWHP & 339.x RWTorque.

I shift typically @ tach indicated 6250-6500 rpm.

SUGGESTIONS?

 

Did you get the LCA relocation brackets? These are needed with the car is lowered to maintain the proper geometry of the rear suspension. I use them on a stock height car and I cut 1.7's on Nitto's.

 

I do not have the LCA relocation brackets, but I expect I'll be going back to stock springs in the next few days and dumping the lowering springs. Thank you. Even with stock springs, the LCA relocation brackets made a noticable difference?

 

Here's a couple of things.

1) You should not need the line-lock on launch - use it on your burn-out.
2) You are turning your engine to 6250-6500 rpm's? You do know the stock rev-limiter is 6200 for a reason? You are playing with fate.
3) On your launch, are you spinning - bet you are. You don't have to get rid of the lower springs, just get the lowering brackets for the LCA. You geo is messed up and unloading the tires - the just aren't planting correctly. Not that big of a deal. The brackets are almost a must.
4) Get some shocks - QA1 are reasonable and can be used for street and strip
5) Unload some weight with your tire/wheel selection.

Next things: clutch, tranny, rear-end, more suspension mods... than you'll start on your engine. Better intake, throttle-body, heads, cam... it will never end, trust me on this one.

I think I have said it before (I know I have) this **** is addictive.

Read, practice, change, read, practice, change more parts. One big circle.

David

 

And the winner is.....David
This is so true...