Chameleon T/A

I purchased another C5 Z06 from a forum member here back in July. While I enjoy running my 2003 Z06 with the ECS Novi 2K kit, I was running on borrowed time at 735 rwhp on the stock bottom end. Plus, that car did not have a bar or a cage and my local 1/8 mile finally booted me once I reached 6.10 @ 114 (though that was on 665 rwhp, 15 psi).

Anyway, the new (to me) car is a 2002 Z06 with a forged LSX and TTIX twin turbo kit. It also has an RPM Level 7 4L60/65 among other things. I made some shakedown passes on 8 psi of boost a few weeks ago, which netted me a 6.4 @ 111 on a 1.65 60'. Not bad, but a far cry from where I left off from my SC car. Granted, the TT car was leaving off the footbrake at idle, so no boost on the launch.

Saturday I had some new tires ready to try--Mickey Thompson ET Street R's in 305/45/17. My previous M&H 275/50's were not really working well with this car when I tried turning the boost up to 15 psi.

First pass at the track with the new tires and on 15 psi of boost... I left at around 1200 rpm's and got a 1.6x/6.30/117. I was excited but still disappointed in the 60' and ET. I knew the mph was showing a lot of potential. Next pass I tried stalling it up to 1800--that is definitely a step in the right direction. The car liked it, did a 1.57 60' and hit the traps with a 6.15 @ 118. I was definitely pleased with the MPH! I didn't get any more passes but next time out I'll see just how high I can stall on the footbrake. I've got a transbrake, but a little leery of breaking stuff right now. The car has a C6Z diff with hardened shafts and a DTE brace but that's about it.

Car made 800 rwhp on 15 psi of boost and E85 fuel. In comparison, my SC car ran 1.40/6.10/114 on 15 psi of boost making 665 rwhp (less cubes). So hopefully with a little work on getting the new car to leave harder, the old SC times will be way behind!

MVP'S ZO6

That's really awesome man! Congrats on the new ride and I hope you enjoy it as much as your blower car!

cmiller8006

Very nice. My car trapped 114 on 15 psi a few weeks ago, made same power at 18 psi as you did. Enjoy the power.

ajrothm

Damn good numbers for the first trip out. Its definitely making 800 rwhp! Get it to 60' and its gonna fly.... Turn that **** up to 20 psi and let it eat.... Thats an 8 sec car...

What is the engine combo?

The 118 mph pass on 15 psi right?

Chris Stewart

Nice run! 15psi boost? You stuck it to that SuperBee real good.

On my setup the higher I can footbrake the better the ET. I find the point where it pushes thru the brakes and set my 2step @ 100-200 rpm under that for easy consistent launches. It also helps build boost off the line.

When my stall was 3200 I could footbrake to about 2200. With a 3600 stall I could footbrake about 2600. Now with a 4K stall I can footbrake to 3000.

The transbrake is brutal imo. At 3K it wasn't too bad and cut some 1.5's. Tried turning it up to 3500 and bottomed out the suspension, then rebounded and light em up. I only made a few hits and my 300m half shaft already twisting the splines, so definitely be careful with it.

Chameleon T/A

Thanks, I definitely like driving the TT car better! Everyone at the track comments on how quiet it is too... that's a plus in my book.

Nice! And thanks...

Thanks! It's an LSX 427, LS3 heads and intake, Dr. Phil custom cam. And yes, I edited the post to state 15 psi of boost for that pass.

Superbee even red lighted. I'll definitely look into a 2 step and thanks for the heads up on the t-brake. I will avoid that unless I just try something like 2500 rpm's (if my footbrake/torque converter won't go that high).

ajrothm

I'd definitely stay away from the T Brake... The shock from that will pop axles for fun... I tried mine once on the street and was shocked at how hard it hit the rear end....And that was at 2500 rpms and NOT on the gas... F That... These things break easy enough as it is...

2 step/anti lag is the way to fix this. Also stiffer springs in the wastegates will help it spool quicker.

Put 1 bar springs in the gates, it will spool hard then...

Shoaf85

Congrats man, thing is moving and looks like it's only gonna get quicker.

BLOWNBLUEZ06

Car's moving nicely!

Chameleon T/A

good info... I'll avoid transbrake for now. I may put some front brakes on the rear to try and get more stall speed on the footbrake at the line. Seems to work on the supercharged cars!

Thanks, can't wait to get back out there. Unfortunately it is looking like rain for tomorrow.

Rkreigh

2 step/anti lag is the way to fix this. Also stiffer springs in the wastegates will help it spool quicker.

I had a conversation a few years back when RPM converted my TTiX car over to 4l60 and he told me he also wasn't happy with the reaction times on the trans brake and they were a bit inconsistent and as you mention hard on parts.

the 2 step and anti lag will give you all the boost you need and those little turbos should spool pretty quick and give you all you can handle.

that 60 ft time is already pretty good, the vettes are a bit tough to get to leave hard as they squat and camber the rear tires and lose traction.

some suspension mods will do wonders!

great to see another TTiX user running the car at the track!

fisher auto

She's skippin...very nice!!

Chameleon T/A

Thanks guys--can someone explain the 2 step/anti-lag to me a little better? It's all new to me... I understand the 2 step, but don't know anything about anti-lag. I'm all ears... after my passes Thursday, the car is getting quicker! Managed a 1.52/6.11/119... so close to 120 mph! This was done launching at around 1900 rpm's on the footbrake. If I remember correctly, my datalog said I only had about a half a pound of boost built at the line!

cmiller8006

Anti lag is just that, a true antilag will get full boost on the 2 step at the line. Even you you could build a few pounds would make a huge difference.

cmiller8006

Like this,

Shoaf85

Building boost in an auto car is accomplished differently than a manual car.
Here is my take from past experiences.
Anti lag is used with a manual trans when there is no "load" on the engine (clutch depressed and staged). In that case while you are on the 2step ignition timing is pulled greatly to cause combustion to happen late in the cycle exploding in the exhaust ports/manifolds which spool the turbo.

On an auto trans setup that is the opposite of what you need to do in order to build boost at the line. You need to find the max rpm you can foot brake the car on a sticky track without pushing thru the brakes. Then set your 2step RPM just under that. Being at wot is critical here in order to load the turbos. So once a wot 2step RPM is achieved start adding timing (only in the area of the timing map). The torque converter is loading the engine and in order get up on the converter and start to build boost you need to add timing, sometimes a lot. I think ur on e85 so no worries about pre ignition. Just make sure as soon as you leave that the timing is being pulled back to a safe range.

Bring the car up to NC for a TNT night and id be happy to help you out.