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02-06-2018, 05:27 PM
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#1 |
       
Drives: 12 camaro ss, 72 chevelle, 91camaro Join Date: Dec 2013
Location: findlay,oh
Posts: 2,069
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gearing for turbo car
I'm looking at getting some opinions on these 2 gears. 3.25 vs 3.50.
car should weigh around 3400-3500 with me in it. has 8.50 cert cage, powerglide with brake. solid axle swap with a Ford 9 inch. car will make somewhere around 1500 on motor. looking to trap in the 160-170mph area this is a street car but will realistically see 1-2k miles a year.
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12 camaro ss 427lsx, th400, f310 heads, crower shaft mounts, gpi specd solid roller, shearerfab 2k hp a/w, twin bullseye 88mm turbos, hughes pro ssx bolt together converter, holley dominator, 8.50 cert, backhalf, Ford 9", 33x17x16 tires, c16 fuel
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02-06-2018, 05:51 PM
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#2 |
 
Drives: 2010 SS 2SS M6 Join Date: Aug 2016
Location: Smithsburg, Md.
Posts: 2,445
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wat tires?
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2010 SS 2SS M6 - Tune by RDP dynoSteve!(Woot) - Daily Driver - 150K! - All work by me...
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02-06-2018, 06:48 PM
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#3 |
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Drives: All things Turbocharged Join Date: Dec 2010
Location: AZ
Posts: 1,199
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calculating in converter slip, 3.50's on a 29" tire might not even hit 160mph
Work the math and factor in 10-15% converter slip |
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02-06-2018, 07:06 PM
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#4 | |
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Drives: 12 camaro ss, 72 chevelle, 91camaro Join Date: Dec 2013
Location: findlay,oh
Posts: 2,069
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Quote:
I'm looking at the et drags. they measure 29.9 tall and will grow helping pull gear out on the big end. in the street I'll run 28s and turn boost way down.
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12 camaro ss 427lsx, th400, f310 heads, crower shaft mounts, gpi specd solid roller, shearerfab 2k hp a/w, twin bullseye 88mm turbos, hughes pro ssx bolt together converter, holley dominator, 8.50 cert, backhalf, Ford 9", 33x17x16 tires, c16 fuel
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02-06-2018, 07:33 PM
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#5 |
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Drives: All things Turbocharged Join Date: Dec 2010
Location: AZ
Posts: 1,199
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Starting with a converter loose enough to get a hard launch without a first gear, usually is like a 4500+rpm stall. Then pushing 1500hp to a converter that loose is seriously going to be 10-15% slip. I have heard that Pro Torque converters are the best a low slip with high stall but no first hand experience with them on higher powered cars. If they can keep it below 10%, that is amazing.
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02-06-2018, 09:01 PM
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#6 | |
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Drives: 12 camaro ss, 72 chevelle, 91camaro Join Date: Dec 2013
Location: findlay,oh
Posts: 2,069
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Quote:
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12 camaro ss 427lsx, th400, f310 heads, crower shaft mounts, gpi specd solid roller, shearerfab 2k hp a/w, twin bullseye 88mm turbos, hughes pro ssx bolt together converter, holley dominator, 8.50 cert, backhalf, Ford 9", 33x17x16 tires, c16 fuel
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02-07-2018, 07:25 AM
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#7 |
 Drives: 2011 Camaro 2SS Join Date: Sep 2015
Location: Houston
Posts: 410
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My pro torque works wonders on my glide, i've pulled it up to 180 ish on the 3.27 gears on a 28 tall on the street
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02-07-2018, 07:36 AM
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#8 | |
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Drives: 12 camaro ss, 72 chevelle, 91camaro Join Date: Dec 2013
Location: findlay,oh
Posts: 2,069
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Quote:
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12 camaro ss 427lsx, th400, f310 heads, crower shaft mounts, gpi specd solid roller, shearerfab 2k hp a/w, twin bullseye 88mm turbos, hughes pro ssx bolt together converter, holley dominator, 8.50 cert, backhalf, Ford 9", 33x17x16 tires, c16 fuel
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02-07-2018, 08:39 AM
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#9 |
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Drives: 2011 Camaro 2SS Join Date: Sep 2015
Location: Houston
Posts: 410
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You could always add a GV at the end of the powerglide if you need more gear
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02-09-2018, 04:43 PM
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#10 |
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Drives: it changes Join Date: Nov 2010
Location: Norn Iron
Posts: 1,126
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And not even a mention of rpm ability ?
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02-10-2018, 07:57 AM
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#11 | |
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Drives: 12 camaro ss, 72 chevelle, 91camaro Join Date: Dec 2013
Location: findlay,oh
Posts: 2,069
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Quote:
__________________
12 camaro ss 427lsx, th400, f310 heads, crower shaft mounts, gpi specd solid roller, shearerfab 2k hp a/w, twin bullseye 88mm turbos, hughes pro ssx bolt together converter, holley dominator, 8.50 cert, backhalf, Ford 9", 33x17x16 tires, c16 fuel
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03-14-2018, 01:26 AM
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#12 |
Drives: 2023 SS 1LE 10SPD/2015 SS 427 Man Join Date: Aug 2015
Location: Sacramento Area
Posts: 803
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10-15% Slippage is way old school. We have Coan, PTC and ProTorque converters that have less than 5% at over 2500HP. THe PTC is the easiest to spool because of the Nissan based core. With the new technology in converters also comes the challenge of power management in the lock-up phase in the application of power. This usually occurs within .3-.7 seconds into the run. Playing with engine timing in this area of the run helps tremendously, although most on this forum wont be making the power to need this kind of tweeking.
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03-14-2018, 01:33 AM
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#13 |
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Drives: 2023 SS 1LE 10SPD/2015 SS 427 Man Join Date: Aug 2015
Location: Sacramento Area
Posts: 803
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I have always been a fan of less rear gear and more converter. Just seems to be a little more consistent. Also remember that a lower rear gear (numerically) will help lock the converter up a little tighter.
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03-14-2018, 04:01 PM
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#14 |
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Drives: 12 camaro ss, 72 chevelle, 91camaro Join Date: Dec 2013
Location: findlay,oh
Posts: 2,069
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the shop is doing bigger wheel tubs so I should be able to fit a taller/ wider tire. I've been looking at the 32x14s. if I can manage to put those under it I'll be going with the 3.50s
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12 camaro ss 427lsx, th400, f310 heads, crower shaft mounts, gpi specd solid roller, shearerfab 2k hp a/w, twin bullseye 88mm turbos, hughes pro ssx bolt together converter, holley dominator, 8.50 cert, backhalf, Ford 9", 33x17x16 tires, c16 fuel
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