What gear for a turbo car?

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Oct 26, 2016 | 11:57 PM

lmt0705

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What gear for a turbo car?

Just looking for opinions and ideas on what gear I should be running. My car weighs 3850 with me in it, I'm running a 4l80, twin turbo lsx making 12-1300 rwhp range. I'm running 275/60/15 Mt for tires. I have a trans brake and bump box as well

Oct 27, 2016 | 02:25 AM

Blown06

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On a car of this caliber here is how I do it:

Pick the rear tire.
Pick the rear gear that puts you in the traps at your desired rpm/mph
Pick the 1st/2nd (3 speed auto) or the 1st (2 speed auto) gear to get your desired SLR.

Oct 27, 2016 | 07:01 AM

svslow

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From: Pittsboro, IN

With that kind of power it should trap in the 160mph range. I'd go with a 3.08

Oct 27, 2016 | 07:39 AM

lmt0705

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How do you know what the ideal SLR is?

Oct 27, 2016 | 08:18 AM

a05c

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http://www.yellowbullet.com/forum/sh....php?t=1144450

I don't really want to link to another forum, but to save typing all of that out..

Oct 27, 2016 | 09:13 AM

Camaro9969

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4l80 id run 3.50 back there

Oct 27, 2016 | 09:22 AM

svslow

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Depends how hard you want to rev it in the 1/4. Even with only a few % converter slip you'd be 7000+ doing 155mph with a 3.50.

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Oct 27, 2016 | 03:24 PM

lmt0705

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I should have mentioned I'm currently running 3.50s I was thinking about going to a taller gear to help with traction out of the hole

Oct 27, 2016 | 03:41 PM

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tblentrprz

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Where does the motor HP start falling off?

If 6700 with 275 tire with 8% converter slip puts you at 3.23.

Oct 27, 2016 | 07:41 PM

#11

lmt0705

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Around 6900

Oct 27, 2016 | 08:04 PM

#12

Nathaninwa

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I say 3.0 to 3.25. I run a 28 inch slick and 3.25 gear. Unlocked with my 80e I'm seeing 6600ish rpm for 155mph. I'm making a tad over 1000whp and wish I went with the 3.0 gear setup. Just to calm the launch down a bit and knowing I could always up the launch boost

With that said, I weigh 1100lbs less than you, so that 3.25 gear range might just work

Oct 28, 2016 | 05:50 AM

#13

yenkomike

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From: oxford mi

with the tall 1st gear in that trans and a smaller tire. id go right to a 3.15 gear if I had that kind of power. hell my car makes a little more than half of yours and I run a 3.23 gear ,28" tire and a 1.76 glide. and I'm only leaving at 2 or 3 psi boost to hook on shitty prep tracks.