L98IROCZ89

I have been trying to figure this one out... I have created a chart, but I don't quite know what to make of it. Maybe someone here can help me out.

ZZ4 (350cid motor)
T56 (6 speed manual trans)

calculations are based on:
1. ZZ4 dyno sheet with 650cfm carb
2. shifting at 5700RPM

ZZ4 motor specs:
max torque: 3750
max HP: 5500

T56 6 speed manual specs: (from 94-97 F-Body)
1st - 2.66:1
2nd - 1.78:1
3rd - 1.30:1
4th - 1:00:1
5th - 0.74:1
6th - 0.50:1

REAR RPM
3.23 <- rear gear
1->2 3850 @ 51mph
2->3 4200 @ 76mph
3->4 4400 @ 104mph -> 135mph[fastest it can go in 4th - finish 1/4]


3.42 <- rear gear
1->2 3800 @ 48mph
2->3 4150 @ 71mph
3->4 4400 @ 98mph -> 127mph[fastest it can go in 4th - finish 1/4]

3.73 <- rear gear
1->2 3800 @ 44mph
2->3 4200 @ 66mph
3->4 4400 @ 90mph -> 117mph[fastest it can go in 4th - finsih 1/4]

3.90 <- rear gear
1->2 3800 @ 42mph
2->3 4200 @ 63mph
3->4 4400 @ 86mph -> 112mph[fastest it can go in 4th - finish 1/4]

4.11 <- rear gear
1->2 3800 @ 40mph
2->3 4100 @ 59mph
3->4 4350 @ 81mph
4->5 4215 @ 106mph -> 143mph[fastest it can go in 5th - finish 1/4]

Chart explanation:
1->2 3800 @ 48mph
reads as: shifting from 1st to 2nd at 48mph(5700rpm) will put you in 2nd at 3800rpm(48mph)

Any info is helpfull... thanx!

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***The driver formerly known as 89IROCZ***

1989 Chevrolet Camaro IROC-Z
350c.i. TPI, rebuilt 700R4 auto w/shift kit, Dual catalyst Monza PaceSetter Cat-Back (currently no muffler, sounds on webpage) 3.23 Posi rear, Hypertech chip, Under-Drive pulleys, AFPR, K&N's, moddified MAF, Alarm, Keyless entry, remote starter, 92 Z28 AeroWing, Brand New Paint (6/21/01)

Future: ZZ4 TPI w/EGR, T56, 3.42 or 3.73, Spohn SFC, strut tower brace and LCA's

1989 Chevrolet Celebrity Eurosport
2.8 MPFI, no mods
225,000 miles and still ticking!

More info, pictures and sounds (of the IROC) available on my webpage: http://go.to/iroc-z

AOL IMer: GPA 0point0

[This message has been edited by L98IROCZ89 (edited June 22, 2001).]

ImportEater

There are so many variables -- power to weight ratio, how well you shift, etc. Nice chart and not to flame -- but the best chart doesn't do you any good until you know what it means

If you shift well and there's no traction issues -- go with the 4.11's
If there's traction issues (and there most likely will be) or you only want to shift 3 times, step back on the gears. The numerically higher the gear, the faster it will spool up essentially, but the more likely you are to experience a traction problem. Also, the numberically higher the gear, the more likely you'll have to shift again to avoid bumping your rev limit at the end. Just remember - almost nothing is better than trial and error. do what works for you

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1985 Trans Am - rough and ready -- 3" cat and primary exhaust, lowered 2", custom rust body work mild fender denting. Daily driver.
1976 Corvette Stingray - not so rough, but always ready. 427 BBC .030 over (433 ci) 12.5:1 compression about 600-700 HP/World Class T5 tranny, and no, I can't gun it for fear of breaking my tranny - upgrading to a muncie/gear vendors O/D as soon as I get some more $$$