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08-05-2019, 09:35 AM
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#1
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Power Member / trans break does not equal transbrake
Join Date: May 2009
Location: The Meadowlands
Posts: 4,513
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Rear Gear Selection
time to get the new rear peppered in advance of 10 bolt destruction.
I picked up the rear out used out of a 6 speed car, and it has 4.10s in it. So no bueno for me.
Without any confirmation other than word from the previous owner, my car currently has 3.42s in it. With those 3.42, i trapped a best of 124. But i do not remember what RPM i went threw at, nor was i logging data.
The car has a 26" tire, stock geared 60e and makes about 430 on motor and will be getting 100/150 of Nitrous.
Since the rear going is is a ford rear(8.8) i have been made to beleive ford racing provides the best gear quality wise, so i will most likely be going with them.
Making my choices most likely 3.73 or 3.55.
and yes, i tried all those gear calculator things, they blow.
__________________
99 Z28 - SBE LS1/60e
Motor - 10.84 @ 128 - 1.47 60'
Nitrous - 10.16 @ 132 - 1.40 60"
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08-05-2019, 10:00 AM
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#2
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Lord of the rings / 10 Second Club / Meet Coordinator
Join Date: Aug 2004
Location: Millstone Township, NJ
Posts: 6,357
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Quote:
Originally Posted by LS1ow
time to get the new rear peppered in advance of 10 bolt destruction.
I picked up the rear out used out of a 6 speed car, and it has 4.10s in it. So no bueno for me.
Without any confirmation other than word from the previous owner, my car currently has 3.42s in it. With those 3.42, i trapped a best of 124. But i do not remember what RPM i went threw at, nor was i logging data.
The car has a 26" tire, stock geared 60e and makes about 430 on motor and will be getting 100/150 of Nitrous.
Since the rear going is is a ford rear(8.8) i have been made to beleive ford racing provides the best gear quality wise, so i will most likely be going with them.
Making my choices most likely 3.73 or 3.55.
and yes, i tried all those gear calculator things, they blow.
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What are you spinning the engine to?
I expect you will see 10+ mph with that shot so the maths should be easy on what you will need at the end of a run. Worst case if it's trapping with more bald eagles than anticipated, you can go to a taller tire. Then when you go with the turbos, you will be reassessing this all over again.
__________________
97 T/A Ram Air Convt
Forever dyno queen / 777rwhp 662 rwtq @ 17lbs / 10.2 @ 140
'24 Corvette Z06
17 Sierra 2500HD Dmax
81 Turbo TA
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08-05-2019, 10:05 AM
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#3
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Power Member / trans break does not equal transbrake
Join Date: May 2009
Location: The Meadowlands
Posts: 4,513
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Quote:
Originally Posted by Blackbirdws6
What are you spinning the engine to?
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6700 iirc
__________________
99 Z28 - SBE LS1/60e
Motor - 10.84 @ 128 - 1.47 60'
Nitrous - 10.16 @ 132 - 1.40 60"
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08-05-2019, 11:06 AM
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#4
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Join Date: Nov 2007
Location: Jackson, NJ
Posts: 1,723
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I think your best bet is running the 4.10s, seeing how your car runs, then reassess from there. They will either work well, or give you better insight into what gear you want next.
__________________
1983 camaro- Scrap
1988 camaro- Also scrap
'05 Silverado- You guessed it, scrap
1988 TRX 250R- Ported w/ high compression on 110 octane- Out 60' your LT1
Jersey Shore Street Car Takeover (JSSCT) Founder
Quote:
Originally Posted by LS1ow
and once i get PHB, what do i ajust it too?
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Quote:
Originally Posted by Jersey Mike
Seven.
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08-05-2019, 11:42 AM
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#5
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Lord of the rings / 10 Second Club / Meet Coordinator
Join Date: Aug 2004
Location: Millstone Township, NJ
Posts: 6,357
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Quote:
Originally Posted by LS1ow
6700 iirc
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If you are keeping the 26's. 3.73's will get you to 6500 RPM assuming a 135 mph trap speed through the beams.
If you are planning to rodeo a little harder (or this is just a troll thread), then go with the 3.55's to plan for the future. I know you will want to earn the chute.
Edit: For clarification, numbers assume a locked converter.
__________________
97 T/A Ram Air Convt
Forever dyno queen / 777rwhp 662 rwtq @ 17lbs / 10.2 @ 140
'24 Corvette Z06
17 Sierra 2500HD Dmax
81 Turbo TA
Last edited by Blackbirdws6; 08-05-2019 at 03:25 PM.
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08-05-2019, 02:03 PM
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#6
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Join Date: Sep 2008
Location: Hackettstown, NJ
Posts: 1,634
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The 3.42's will be stronger than the 4.10's. I'd give them a shot first and see what happens before spending a bunch of $$ for something you may/may not need. If you o need to pepper a new rear, you'll have an idea on what gearing you'll need based on what you're getting out of the current setup.
Also, figuring out trap RPM with an automagic is hard to pre-calculate as it depends a *lot* on the converter and it's slip on the top end... Unless you have a high zoot mega-lockup-clutch one, in which case RIP transmission?
__________________
1998 Z-28 - SLP lid - Ported TB - LS6 Intake - Dynatech SS headers/Catted Y - Magnaflow Exh - 3.42 - Yank SS3600 - UMI weld-in subframe connectors, Adj LCA, Adj PHB, Q1A TA - Bolt-in Relocation Brackets - Strano springs - Koni shocks - 17" C6Z06 wheels - 326HP/335ft-lbs - 12.35 @ 110.41
Quote:
Originally Posted by Blackbirdws6
I can appreciate a dream but this person needed some real friends.
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08-05-2019, 03:23 PM
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#7
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Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
Posts: 19,341
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Yeah I'd be curious about converter + spray = how much slip?
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08-05-2019, 07:05 PM
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#8
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11 sec club
Join Date: Aug 2014
Location: Woodbridge
Posts: 834
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I will be your guinea pig, spraying 100/150 on a 28 with 410s when AC season is over and I get min to install the rest of the kit.
__________________
99 Z28 Trick Flow 215s milled to 61cc 228/232 Cam Fast 102 built 4l65e trans 4000 converter 12 bolt 410s Electric WP deleted PS/AC Dyno & Track tuned
2015 ATS Coupe. AWD 2.0 Turbo
2012 2500hd Silverado with LTZ 20s on 35x12.5x20
86 Buick GN Lesabre 1 of 117 (4-Sale)
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