Alright guys so I'm having some trouble getting this car to leave. Here's a run down of the setup on the car. Rods pistons cams FP black twins haltech platinum pro Tilton twin disc clutch. Car made 572whp on a conservative mustang Dyno at 20psi. So here's my trouble.... I put some 28 10.5 15 Hoosiers c7 stiff walls on the car and figured it would leave alright on them hoping for 1.4-5 60fts. I'm using the antilag launch control function with the haltech leaving on 10 psi @ 5500rpm and have the antilag set to shut off at 15mph. I let the clutch out and the car falls on it's face. I've tried slipping clutch and dumping it and it just bogs. The Tilton clutch is tricky to begin with it's a pain cause it's basically on or off and slipping it is difficult. I burned the clutch up this weekend at the track so i need to fix that and get out and get some logs of whats going on. I did a few things to free up some power this car should make 700ish at that boost level. I built some exhaust dumps and eliminated the muffler and gained 4mph trapping @101 with a slipping clutch in the 1/8th mile and also removed the air filters. Best 60ft to date withw3 passes is a 1.75. Any ideas for getting this car to stop falling on it's face? I'm really open to suggestions cause I'm getting frustrated with looking like an idiot on the starting line haha. I'm not sure if it's tune related or suspension. I know IDS now makes a drag coilovers for the Z and I've been considering ordering it.

 

disclaimer: lbs/whp nerd coming out...

what weight can you take off the car?

 

Even if I pulled 100-200 lbs out of this car I highly doubt it make a big difference with it falling on it's face like it does. I'm looking for more specific advice on how to get these cars to 60ft. That's a pretty general statement my friend.

 

try it... what can you take off the car temporarily to test this?

My car pulls like crazy being 400lbs less ... I'm around 2900lbs now hoping to get to 2700lbs

But I do understand what youre asking ...

 

Well I actually did test that theory. I had a friend with me he was in the car on the first pass. Next pass he got out same scenario. Car fell on it's face both times and this was in Mexico. The car hooks that's definitely not a problem. I'm asking more along the lines of where are other peoples anitlag settings at and those who have had success 60fting their car.

 

gotcha ... what ever happened with your restrictive exhaust / intake - did you do anything about that?

 

Welded myself at work not bad for not being behind a tig in 5 years.


Yep I built some dumps. That's also the same day the clutch started slipping but I gained 3mph from the previous passes. I'm gonna get the clutch rebuilt and go try to break stuff again and see what it does.

 

Those are sweet - right on! RC is pretty smart guy!!!!!

Any thoughts on the intake?

 

Well gaining 3 mph from previous passes with the muffler on tells me the muffler was a pretty large restriction. I made 2 passes the weekend before both trapping at 98mph one was a 7.31 and the other a garbage pass but 8.2 still both trapped at the same speed. Now idk if I'll gain more mph with a new clutch or not but its definitely toast. Ill just have to see. I probably won't mess with the intake just yet. If anything I'll put a larger throttle body on and put some new injectors in and switch the car over to ethanol.

 

I can only imagine a fresh clutch will help your times

not trying to hijack the thread but if you dont address the restricted intakes, would a revised TB setup do anything?

 

I would PM Tim (OldManZ ?) He could tell you about his service up and probably help you with launching.

 

I think I get what you're saying, but let me type it out.
Are you saying that when you launch the car doesn't have enough power for the grip and it bogs down? If so, it sounds like the settings you put in the Haltech to restrict the power is causing your issues. Have you tried launching without those settings in place?

 

I agree with this, can you log to see what is going on, to see what condition is being met, causing it to pull power on you? (this is assuming that 15psi/5500 rpms is enough go-go for that tire setup)

If I were you I would start aggressive to the point that you spin off the line, then tweak it down from there until you get where you want to be. That way you avoid this whole slipping the clutch to make up for it bogging thing.

Does it have a chance of spinning that tire setup without the launch control out of curiosity?

I wish I had more experience with the haltech set up to help.

 

Ya that's pretty much exactly what's going on. I might be pulling to much timing trying to build boost to leave and leaving the launch control on for too long. I'm pulling -25° at 5000rpm then backing it off to -10° at 5500rpm and have the launch control set at 15mph. Its making 10-12psi on the starting line which should be plenty to leave on. Ive tried it at 9mph but not at 0mph. Ill have to play with the launch control settings and log some bogs to see what it's doing and make changes and see what works best. But yes I have tried leaving without the launch control and same thing it just bogs. I have got it to spin with more tire pressure and no burnout but that's not ideal. I want it to work haha. I have a 6.8 1/8th mile goal with the current setup and I really want to get the car there.

 

I'm trying something else with this go around of repairs/upgrades. I ordered an RJM clutch pedal assembly. Ryan is a good guy over there and seems to think his pedal assembly will help with getting this car to leave. We'll see.

 

Hi, my old sign is OldManZ.

I'd try it without the anti lag.

If you are retarting -25* just for launch, that's insane. and that's why it's falling on it's face. You don't make enough power to use anti- Lag.

The RJM Petal will help alot.....

Also, Practic, Practic Practic will help you the most.

My best 60 ft is 1.51, few people with Z's go 1.40 unless they are much higher HP

Hope this helps

 

With leaving on boost I have a much better chance of getting decent 60fts. Leaving with horsepower is kinda how u make that happen especially on a slick. I can definitely try turning the antilag off at 1mph that way it reverts back to the regular timing map almost instantly. I'm willing to try anything and see what works. I race this car in our local noprep series stick shift class so I need to get it figured out soon. But the clutch pedal won't be here till the end of the month.

 

TT03z, I have a 2 step, but it does not retard timing, that said, I've not tryed it yet at the strip. My 1.51 60ft was without it. So, like you said, leaving under boost should help at lease some.

 

You should try leaving on your 2 step. I'm guessing your tuning with a Haltech and yours is a blower car correct? If that 2 step is programmable like the Haltech I bet it would knock your 60ft down even more cause u don't have to lift the throttle while launching. Pedal down then work the clutch is all. That's what I'm shooting for at least. Out of curiousity what was your best 1/8th mile to date? I ran a 7.31 @98 with a 1.75 60ft on the Hoosiers. Next pass I put the exhaust dumps on and removed the foam air filter but broke the clutch and still trapped 101. I'm kinda excited to get this new pedal assembly in and start playing with the antilag. I think I'll finally be able to knock down my 60fts and get this car into the 6.8's 1/8th mile and I'd like to see it go 10.50's in the 1/4.

 

Yea, that's why I got the 2 step. Just have not got to the track yet.

Stock Block, Vortech V2 Sc-Trim

I tune with the Split Second Box.

Best 1/8 is 7.050 @ 103 mph

Your making 700whp?