how'd i/car do on this setup?
Thread Starter
Joined: Dec 2008
Posts: 1,229
Likes: 24
From: lancaster, pa
how'd i/car do on this setup? This past Wednesday I went to the nearby track at cecil county dragway and ran the firebird for the first time and its setup. Was curious if the trap speed is alright for my mods. The car ran a 12.8@113.7mph with a 2.23 sixty foot. Here is the mod list:
LQ4 with 317 heads with only a 3 angle valve-job so the compression ratio is still 9.4:1
Voodoo cam 232/238 .599”/.601” 112+3 LSA
SLP LT headers w/hallowed out cats and 3” all the way with no muffler
SLP Lid with free ram air mod
LS6 intake and ported TB
Stock 4L60 w/3200Stall
12 bolt 3.73 gears
16” v6 wheels 245/50/16 tire diameter is ~24.5”
OL tune with AFR 12.6 w/28* timing
Weight w/o driver 3475lb
i dont know if anyone (posted anyways on here) is running a similar setup that im running but if anyone's close to it im curious on their results. this is a baseline figure cause i plan on rebuilding the trans then go FI(dunno super or turbo yet).
LQ4 with 317 heads with only a 3 angle valve-job so the compression ratio is still 9.4:1
Voodoo cam 232/238 .599”/.601” 112+3 LSA
SLP LT headers w/hallowed out cats and 3” all the way with no muffler
SLP Lid with free ram air mod
LS6 intake and ported TB
Stock 4L60 w/3200Stall
12 bolt 3.73 gears
16” v6 wheels 245/50/16 tire diameter is ~24.5”
OL tune with AFR 12.6 w/28* timing
Weight w/o driver 3475lb
i dont know if anyone (posted anyways on here) is running a similar setup that im running but if anyone's close to it im curious on their results. this is a baseline figure cause i plan on rebuilding the trans then go FI(dunno super or turbo yet).
Thread Starter
Joined: Dec 2008
Posts: 1,229
Likes: 24
From: lancaster, pa
saw your post. you must have a factory freak 
gaining 3mph in DA alone. i know there's room for improvement and i imagine i can pick up a couple more mph if i work with the sixty footer as well as possibly going to a larger wheel diameter? also bare in mind im running 9.4:1CR as compared to 10.1:1CR fwiw. i believe the trans was shifting at 6100-6200 since i have the commanded shifts 1-2 at 5800 and 2-3 at 5850
gaining 3mph in DA alone. i know there's room for improvement and i imagine i can pick up a couple more mph if i work with the sixty footer as well as possibly going to a larger wheel diameter? also bare in mind im running 9.4:1CR as compared to 10.1:1CR fwiw. i believe the trans was shifting at 6100-6200 since i have the commanded shifts 1-2 at 5800 and 2-3 at 5850 Yea im with him ^^^ something is not right. I have seen guys run high 12's with a lot less then you. But it's a nice setup if you can work out the bugs and get it running right. I'm thinking you should be in the 11's I have seen stalled, h/c cars, with smaller gears in the 11's
Edit: the h/c are like 2.5 ls6's and like a 281 size cam. But I didn't pay attention to the compression drop that could be were its at. Are you planning for boost down the road?
Edit: the h/c are like 2.5 ls6's and like a 281 size cam. But I didn't pay attention to the compression drop that could be were its at. Are you planning for boost down the road?
with that short of tire your 373's are acting like 410's, which if you could hook up should actually help you. Id set all your shifts to 6100-6200 becuase im sure that cam wants some rpm. What are you going through the traps at rpm wise? is it hitting the rev limiter yet?
Thread Starter
Joined: Dec 2008
Posts: 1,229
Likes: 24
From: lancaster, pa
with that short of tire your 373's are acting like 410's, which if you could hook up should actually help you. Id set all your shifts to 6100-6200 becuase im sure that cam wants some rpm. What are you going through the traps at rpm wise? is it hitting the rev limiter yet?
Trending Topics
Yea, thats were you wanna be. From the shops I have talked to you want to be at the top of third when you trap. So im guess with a good 60' you should be trapping around that 117-120 range
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo Thread Starter
Joined: Dec 2008
Posts: 1,229
Likes: 24
From: lancaster, pa
i see. with something like 17" or 18" the top end of 3rd would be closer to like 125-130mph correct? like spicebird said, with the 16" im running its like 4.10s so the top end right now in 3rd is about 117-120. if i bump the WOT shifts a bit more to actually shift at like 6300-6400, taller tire diameter, and a better sixty footer i imagine it'll trap 116-118?
2nd video? In order to see a 2nd video, we'd have to first see a 1st video...
Thread Starter
Joined: Dec 2008
Posts: 1,229
Likes: 24
From: lancaster, pa
ooops, i forgot i posted it in the 12 second sub-section under the racing section. haha
12 sec section link
12 sec section link
i see. with something like 17" or 18" the top end of 3rd would be closer to like 125-130mph correct? like spicebird said, with the 16" im running its like 4.10s so the top end right now in 3rd is about 117-120. if i bump the WOT shifts a bit more to actually shift at like 6300-6400, taller tire diameter, and a better sixty footer i imagine it'll trap 116-118?
Here is a calculator to help do the math...
http://www.pszweb.com/car/gears.htm
just pick your car in the drop down menu, change the gears to 3.73, and put in whatever tire and rim size you want to run and hit calculate and it will bring up a graph and say what speed and rpm and gear.
Thread Starter
Joined: Dec 2008
Posts: 1,229
Likes: 24
From: lancaster, pa
exodus, i've used that site before. i was suggested to use the actual tire diameter of my tires as compared to the universal numbers thats online(like the one you posted) to get a more accurate value for the pcm to register which was where i measured the tires ~24.5" all around.
Ha ok well simple enough. But are you using the tire mounted or dismounted when you got the measurements. Wouldn't the air pressure and weight of the vehicle cause it to change? Idk for sure that why I am asking. But either way I think if you got a good sticky launch you would be in a lot better shape. I know it's hard for guys around here in Oklahoma to get a good launch our 2 tracks dont always have very good prep. Also what kind of tire are you running?
Thread Starter
Joined: Dec 2008
Posts: 1,229
Likes: 24
From: lancaster, pa
tire mounted so everything is accounted for-motor/chassis/springs etc). i may bump the WOT RPM by 100RPMs and the MPH and see how it shifts. what kind of whp with 3.73s and 3200stall for an LSx trapping 113-115mph btw? 350whp?
