"MY OPINION" (Diff Gears)

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06-09-2005, 01:23 PM
BEARWOOD

"MY OPINION" (Diff Gears)

I posted my question last week about installing new diff gears in my vz ss ute and with the feedback made what i thought was a good decision.(How wrong i was!!) I opted to go with the 3.9s instead of 4.11s and have been kicking myself ever since. Maybe i was expecting to much, but to be honest the difference is no where near to what i was hopeing for.
Cruising at 100k in 6th gear and its barely a needle width over 1500rpm so im estimating not even 1600rpm. To have it sit on 2000rpm exactly i have to be doing 127k's. I was hoping to have it sit around 2000rpm while i was doing 110k's and for it to feel alot more tourquie down low but got neither and am very dissapointed about the whole thing. For anyone thinking of changing there diff gears i would strongly recomend driving a car with similar set up and the gears of choice before changing,but thats just "My Opinion". ;)
06-09-2005, 01:34 PM
BlueSS

Why would you want it reving at 2000rpm at 100kmh?
06-09-2005, 01:45 PM
BEARWOOD

Read again,i said "around 2000rpm at 110ks" so id be happier if it was around 1800rpm at 100k's not where it is at the moment as there is still poor response in 6th gear.(Not that i expect it to pull hard but a little more would be nice).
06-09-2005, 01:46 PM
OakenShield

Mate if you did a search you would find that @ 100 clicks with 4.11's it revs at only 1721RPM in 6th. With 3.9's only 1637RPM

http://www.ls1.com.au/forum/showthre...ght=Diff+Gears

I know it's a bit late to find out now....

Cheers,
06-09-2005, 01:49 PM
GETUTED

Sounds like you probably expected too much.
3.9 turn the gear box into a 5 speed with an overdrive, rather than a 4 speed with two overdrives!! Leave it in 5th and you'll be around 2000rpm. :)
4.11 aren't all that much better then 3.9's IMHO.
06-09-2005, 01:50 PM
Danv8

Quote:

Originally Posted by BEARWOOD

Read again,i said "around 2000rpm at 110ks" so id be happier if it was around 1800rpm at 100k's not where it is at the moment as there is still poor response in 6th gear.(Not that i expect it to pull hard but a little more would be nice).

I know what you mean by not pulling hard in 6th. Although 6th is just a hwy cruise overdrive gear imho you won't get much out of it really in terms of pulling just excellent quietness and fuel economy.
06-09-2005, 02:01 PM
BEARWOOD

Did the search before i made my decision but was more interested in peoples opinion that had already had it done and drove the car in similar circumstances as i do. Looking back maybe i should of took more notice of the figures and sprouted a set of balls before i made my choice.
06-09-2005, 02:07 PM
BLACK 346

6th gear is only for NT drivers and bragging rights
imo. Never used it down south, but gets the odd
work out up here when over the double ton :)
06-09-2005, 02:08 PM
Wonky

Quote:

Originally Posted by BlueSS

Why would you want it reving at 2000rpm at 100kmh?

Why not? :)

Standard A4's do around 1850rpm at 100kmh, mine with 3.46 does a bit over 2000rpm and that's no drama at all. Still get very good highway consumption. I would think that on a M6 that would put you much more in the power/torque part of the rpm range all round.
06-09-2005, 02:15 PM
BEARWOOD

Quote:

Originally Posted by OakenShield

Mate if you did a search you would find that @ 100 clicks with 4.11's it revs at only 1721RPM in 6th. With 3.9's only 1637RPM

http://www.ls1.com.au/forum/showthre...ght=Diff+Gears

I know it's a bit late to find out now....

Cheers,

Theres no way it is doing 1637rpm @100k in 6th gear. I knew the figures before i did it and after i had it done i even wondered if they had changed them at all. Just gota live with it now!
06-09-2005, 02:28 PM
markone2

Quote:

Originally Posted by BEARWOOD

Theres no way it is doing 1637rpm @100k in 6th gear. I knew the figures before i did it and after i had it done i even wondered if they had changed them at all. Just gota live with it now!

I'm starting to wonder exactly what gears you do have installed :confused: ,
those M6's I have driven with 3.9's installed most certainly made for a big difference imo
06-09-2005, 02:29 PM
RED R8

Have you had computer re-calibrated not sure if this may be affecting rpm readout.
06-09-2005, 02:36 PM
seldo

Quote:

Originally Posted by BEARWOOD

Theres no way it is doing 1637rpm @100k in 6th gear. I knew the figures before i did it and after i had it done i even wondered if they had changed them at all. Just gota live with it now!

The comparison in 6th between 3.91 vs 4.11 is:
Speed 3.91 / 4.11
80kph 1310 rpm / 1377rpm
100 1637 / 1721
110 1801 / 1893
130 2129 / 2237
160 2620 / 2754

(thanks to sid447)
06-09-2005, 02:37 PM
SCOTTR8

Quote:

Originally Posted by Dazvyss

Have you had computer re-calibrated not sure if this may be affecting rpm readout.

ditto, sound more like the speedo is yet tobe recalibrited
06-09-2005, 02:39 PM
Ryzz

Quote:

Originally Posted by BLACK 346

6th gear is only for NT drivers and bragging rights
imo. Never used it down south, but gets the odd
work out up here when over the double ton :)

Or Strokers with lots of torque than allow u to use 6th Gear with a 3.46 Diff from 90-100Km without any dramas!! :D

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