reeperz28

iTrader: (1)

Things have changed since the build as far as its not my daily driver anymore and looking for the best quarter mile time. Im going with a ss4000 stall and was dead set on 3.73 but now its off insurance and will only be seeing the strip now.. is it best to match the rear end gears to be at the top of third at the 1/4 mark and to accomplish that will 4.10's be the ticket?
Stock gear ratios in a 4l60e
226/234 cam shift points 6600 rpm
Goal hitting traps around 6450 6550 rpm.
Wheel is a 18inch y2k with drag radial for now..
I live in 5800 da average so mph is around 115-117
If i do go to sea level mayby i should also take that into mind that i will be trapping 120'+ there.
Guys with 4/60 e what rpm are you trapping with what gear ratio thanks in advance.

guppymech

iTrader: (7)

I think 4.10s would be better than 3.73s if you are staying NA. If you're going to spray it go with 3.73s. For a drag only car those 18" rims are not going to help you out, they're too big in dia. A 15" rim and some slicks with a sidewall will hook up best. 4.10s with a 26" tire will get you 123 mph at 6500. To hit 117 @ 6500 you need an even steeper gear. Check this gear calculator out, http://www.f-body.org/gears/

1lejohn

iTrader: (9)

Flip a coin. Like stated above NA the 4'10s will work . I don't think you'll hook on the 18" drag radial with them. I haven't been able too. On slicks the car went 1'4s in Nov. The 4.10s are a little much with the 3.06 1st of the 60E. On spray you'll for sure run out of 3rd gear. I like the 60E ,looking into the 2.85 plantetry gear set for them from RPM.

reeperz28

iTrader: (1)

Yea if my money pans out right im going to get some 15's and a slick for sure and that is what im afraid of doing by getting a 150 shot or anything else. Mayby 3.73's will be a better choice

Grr

iTrader: (2)

get the 4.10s and use a 28" tire when you get new ones. perfect combo its what I run

reeperz28

iTrader: (1)

Looks like you have a pretty solid combo im sure in the future ill do a bigger cubed bigger higher revving cam. Nothing is set n stone so 4.10' s will work nice for now plus i like the idea of them. I have ran 2.73's for four years and having an extreme change will be nice.

1lejohn

iTrader: (9)

With your combo sure 4 series are fine. With a composite manifold build and a 60E they work fine in the 1/8th not so in the 1/4 . On spray you'll be in OD before crossing the stripe.

Grr

iTrader: (2)

This year I stock bottom end, Ls1 intake, stock 4l60 and same heads cam rear and tires. 11.4 120 mph 6000 at the stripe shifting at 6000. Worked absolutely perfect. With the OP setup it would be fine, should go 130 no problem

1lejohn

iTrader: (9)

Theres a lot more then just that. Stall speed , how hard the car launches, how fast the engine revs. Put a higher flowing intake and see what happens. The LS1 intake is choking it. Can 4'10s work sure but every combo is different.

Grr

iTrader: (2)

No there isn't anything more than that. 4.10s will go mid-high 120s with a 28" tire and a 4000 stall. 3.90s would be ideal but like me he can't use them as they don't make a 3.90 fora 2 series carrier.
Btw I have another 150HP this year, and a super victor, still keeping the 4.10s

Grr

iTrader: (2)

another thing, you stated you will be going with bigger cubes in the future, so any new setup you do will likely rev to 7000 or so. Im planning my new setup to turn to 7400 and even with 10% slippage I am looking to go mid 130s
A little more gear allows you go go with a lower stall or more importantly a lower stall ratio and maintain the 60' while getting a much better coupling up top and a couple more mph. makes it better from a roll as well

1lejohn

iTrader: (9)

It doesn't on my combo with 28/10/16s. Its way past 6k in 3rd on motor. On spray its close to 7k way past the power band of my motor and intake.

I'm hitting 3rd right at the 1/8 mile stripe running NA. Car was set up for 1/8 mile index racing on spray.

With the plastic intake your not making power past 6200 its already layed down and just making noise.

1lejohn

iTrader: (9)

Yea but a what rpm. The car could be faster with a different gear set.
I run in the 127-130 range on motor. I'm also way past the power band of the engine. The Victor likes RPM so yes I would run them or maybe even more.

Grr

iTrader: (2)

my old converter was 3% slip it was very efficient and would pull 1.60-1.62 60' with that setup every time. I crossed the stripe at just below 6100 at 120mph. The OP's desired 6600rpm limit with 5% converter slippage would be right around 127. Remeber he has a high DA and only expects to trap 120 on motor. Would take a good jet to get to 130

28" tire with 4.10s direct no slip

5900 120
6000 122
6100 124
6200 126
6300 128
6400 130
6500 132
6600 134
6700 136
6800 138
6900 140
7000 142
7100 144
7200 146
7300 148
7400 150

reeperz28

iTrader: (1)

Yea i played with gear calculator a little bit. With my setup as is on a mail order tune and 2.73 gear and 2800 stall i had a 60' was a 2.1 and i trapped 114 shifting 6450 6500. With a full tune, more weight reduction, ram air setup im planning on trapping 117 (goal). 6000 DA sucks. I think 4.10's will work nice if i hate em ill switch to 3.73's

Grr

iTrader: (2)

yeah i wish they would make the 3.90 for a 2 series. would sell allot of them.

BTW if you are like me (I expect it early this year) you will be buying a new 12 bolt anyway in the near future

reeperz28

iTrader: (1)

Most likely be getting a 12 bolt or s60 later and yes 3.90's will be going in it ha thanks for the input guys

z28241

iTrader: (13)

if it helps im running 4.10's and 27" tire, and yes for the 1/4 mile, drive to the track which is almost an hour.

Blackpanther99

iTrader: (8)

4.10s will be the best bet for your goals

Grr

iTrader: (2)

tell you what, i also went from 2.73 to 4.10, you are going to be pissed you didnt do it sooner. The car is just violent in comparison. much easier on the trans too