Launch Advice to get into the 11's

[Cpanthers85]

Looking for some launch advice...

Last night I ran a consistent 12.2 with 2.1 60ft times at 117mph.

Mods: Eforce with LS9 Cam. 3.5 pulley. Auto (LS3 conversion) supporting fuel/air mods. 525hp/495ftlbtq

Suspension: Strut tower brace, pfadt drag pack (trailing arms, toe rods, solid subframe/differential/engine mounts, front and rear sways). Nitto nto5r Drs on stock rims.

I heated the tires up really well, good amount of smoke in the water box.

All nannies are off. Put it in manual mode, but let it shift itself (tranny is tuned).

It was loose in first, but hooked in second, then pulled through third.

With the power and mods, everyone says I should be in the mid 11s but I can't figure out what else to do...

My options are:

pulley down (which will make my traction issues worse lol)
18" c6 vette wheels with Mickey Thompson DR in the rear.
Gears. Maybe swap the 3.23 for 3.73 or 3.91 but I'd assume it would make the lack of traction worse like a pulley swap.

Not sure what else to do. I've been told to undue the front sway, but I'm open to suggestions.

Thanks.

[jbrown13]

IMHO, your biggest drag on 60' time are your rear tires, having used both NT05R and MT drag radial.

Gears will also help the MT tires. But if you're spinning Nittos with the 3.27 gear, it will only get worse with a lower gear.

[Denis]

are you power braking it or just leaving off idle?

[11syn3rgy]

What rpm are you launching at? Rolling into it or stabbing the gas? I have similar mods (minus the cam). I am running Z06 18's with MT's out back. I had Nitto 555R's on 20" rims and they were great in the 12's but got much worse once I hit the 11's. I'm currently running consistent 1.6 60' times and 11.08 at 124 is my best ET

[Camarojt]

Originally Posted by Cpanthers85

Looking for some launch advice...

Last night I ran a consistent 12.2 with 2.1 60ft times at 117mph.

Mods: Eforce with LS9 Cam. 3.5 pulley. Auto (LS3 conversion) supporting fuel/air mods. 525hp/495ftlbtq

Suspension: Strut tower brace, pfadt drag pack (trailing arms, toe rods, solid subframe/differential/engine mounts, front and rear sways). Nitto nto5r Drs on stock rims.

I heated the tires up really well, good amount of smoke in the water box.

All nannies are off. Put it in manual mode, but let it shift itself (tranny is tuned).

It was loose in first, but hooked in second, then pulled through third.

With the power and mods, everyone says I should be in the mid 11s but I can't figure out what else to do...

My options are:

pulley down (which will make my traction issues worse lol)
18" c6 vette wheels with Mickey Thompson DR in the rear.
Gears. Maybe swap the 3.23 for 3.73 or 3.91 but I'd assume it would make the lack of traction worse like a pulley swap.

Not sure what else to do. I've been told to undue the front sway, but I'm open to suggestions.

Thanks.

An 18" Vette rim with MT DR will help tremendously. I Know Nitto Nt05r's aren't the best choice but I'm surprised that all you could get was a 2.1 60ft time. That's a horrible 60ft for your mods. You should be spinning badly.
If I were gonna change gears I would go with 3.45's. 3.73's can be too much gear for a supercharged car and 3.91's are definitely too much gear. You will be in 5th gear going thru the traps.

[Cpanthers85]

Thanks for all the replies.

I just stabbed the gas when I took off and ran exact 12.2 back to back, same 60ft. Then I tried power braking it around 2500 rpms...first gear was utterly useless and I had to back out of it because i could feel the backend starting to go sideways. Ran my worst time of the night, too embarrassed to post.

I priced out 18s and the MT. Hopefully that does the trick... No issues with the regular radials and 20s upfront?

[11syn3rgy]

There's your problem. Launching way too high. You will want to bring your tire pressure down to 18-20 psi, get a really good burn out (until you can see white smoke), get to the line and power brake (both feet) to 800-900 rpm. When you see the 3rd amber light, stab it. Even MT's won't hold launching an auto with a blower at those rpm's. Not unless the track has crazy good prep. Trust me, this will work!!

[11syn3rgy]

Originally Posted by Cpanthers85

Thanks for all the replies.

I just stabbed the gas when I took off and ran exact 12.2 back to back, same 60ft. Then I tried power braking it around 2500 rpms...first gear was utterly useless and I had to back out of it because i could feel the backend starting to go sideways. Ran my worst time of the night, too embarrassed to post.

I priced out 18s and the MT. Hopefully that does the trick... No issues with the regular radials and 20s upfront?

No, I run stock 20's up front. Just bring the psi up to 40-45 or so for less rolling resistance

[Denis]

Originally Posted by Cpanthers85

Thanks for all the replies.

I just stabbed the gas when I took off and ran exact 12.2 back to back, same 60ft. Then I tried power braking it around 2500 rpms...first gear was utterly useless and I had to back out of it because i could feel the backend starting to go sideways. Ran my worst time of the night, too embarrassed to post.

I priced out 18s and the MT. Hopefully that does the trick... No issues with the regular radials and 20s upfront?

no issues running 20's up front and 18's in the back...as long as its a 28" tall tire. 305/45-18's are the same height as the OE tires.

20's up front and 18's out back...

[Featherburner]

IMO you shouldn't be looking at the car. This has driver mod written all over it. I'm cutting 1.68-1.72 60' on Nitto NT05R. You need better throttle modulation and walk it out of the hole.

[jbrown13]

I would tend to agree with all the comments about the MT tires and the launch RPMs.

I did notice in re-reading your post you made the following statement "I heated the tires up really well, good amount of smoke in the water box". I hope you meant in front of the water box, otherwise your rears are probably still wet after the burnout

My experience with the Nittos was they were very inconsistent. MTs are very predictable. I'm a N/A car with the typical bolt-ons, 4000 stall Circle-D, cam, heads and 3.91 rear gear and around 490 RWHP. Cut 1.565 to 1.610 60' times with 11.1x to 11.3x ETs on the MT's. Best I could do with the Nittos was a 1.763 60' and an 11.526 ET.

[VADER SS L99]

The thing I noticed with your post is you wrote your running a Nitto NT05R on stock rims. That tells me your using a 315/35R20 on a 9" rim. Definitely not recommended. Plus I doubt the contact patch is very good stretching the tire like that plus it may not be able to achieve good sidewall flex. It does sound like driver mod and some 305/45R18 MT tires will help you the most but that large of a tire on such a small wheel can't be helping your situation.

[Cpanthers85]

I was told that NTO5R on the stock rims would work for a Drag racing setup by a trusted vendor on here. Before I made any major modifications, I ran a faster time with the stock tires vs the NTO5R on stock rims. That should have been my red flag.

And I know I might need a "driver mod", hence why I am asking for advice... It doesn't have to be the car... it could be the technique.

Thanks for all the input.