31's + 4:1's + 1.6 EFI + 4.6:1 diffs = Too low????

[Gutless]

As the cryptic title says I have a sierra ute with 1.6 EFI, and 4.11 diffs (dead) and I am upgrading to WT's. I have been offered some 4.6 diffs, but I'm not sure if these will be too low or not.

I drive the ute 6 days a week in city and on h'way.

Will it be revving its tits off?

Opinions please. Better yet can someone tell me estimated RPM

Cheers
Peter

PS. it has manual sierra 5sp and 1 litre transfer.

[mrRocky]

maybe 350/400 rpm more id say

[joeblow]

not with 40" tyres. what size you running?

[Gutless]

31's joe.

[Highway-Star]

yeah I personally think that's too low. You'll be doing about 4230rpm at 100km/h in 5th.
If you got a 5 speed with the 0.79 overdrive (which I am still yet to actually see a real version of) you'll get about 3870rpm, which is probably OK.

with the 4.1 diffs you said have died, you were doing 3750rpm, or 3450 with the 0.79 o/d.


Guess it depends how much you like high rpm

[lay80n]

http://www.lepayne.com/gears.html

Knock yourself out


Layto....

[dank]

Going on these figures:
1.59 tranny (approx I litre high range ratio)
.86 5th gear
4.6 diff gears
31" tyres

= ~4100rpm @ 100km/h

hope that helps. Probably a touch high but at least throttle response will be sweet at 100km... as its up there!

My zook is going to be 4600rpm at 100km/h with a 20v 4age. lol. should be interesting.

[joeblow]

31's joe.

its gonna be borderline, depends on how quiet the cab is really. 4000rpm is what i aim for (max) at 100 kmh when gearing vehicles, but the extra 100 rpm or so may not be too bad. will be sweet off-road

[JrZook]

As the cryptic title says I have a sierra ute with 1.6 EFI, and 4.11 diffs (dead) and I am upgrading to WT's. I have been offered some 4.6 diffs, but I'm not sure if these will be too low or not.

I drive the ute 6 days a week in city and on h'way.

Will it be revving its tits off?

Opinions please. Better yet can someone tell me estimated RPM

Cheers
Peter

PS. it has manual sierra 5sp and 1 litre transfer.

If you are upgrading to WT's why not run NT 3.9:1. That will probs get you around the 3.3K@100 mark which im sure the 1.6 can pull.
Title is a tad confusing are you running 4:1 low range gear set as well? Or just the 5 speed with 1l tcase?

Dan

[Gutless]

As the cryptic title says I have a sierra ute with 1.6 EFI, and 4.11 diffs (dead) and I am upgrading to WT's. I have been offered some 4.6 diffs, but I'm not sure if these will be too low or not.

I drive the ute 6 days a week in city and on h'way.

Will it be revving its tits off?

Opinions please. Better yet can someone tell me estimated RPM

Cheers
Peter

PS. it has manual sierra 5sp and 1 litre transfer.

If you are upgrading to WT's why not run NT 3.9:1. That will probs get you around the 3.3K@100 mark which im sure the 1.6 can pull.
Title is a tad confusing are you running 4:1 low range gear set as well? Or just the 5 speed with 1l tcase?

Dan

4.1 transfer but high range is the same as 1 litre anyway.

I thought about 3.9's, but I really like the way it drives on the 4.11's.

To give you some background, I have just dropped my 1.6 8v TBI motor out (~60kw) and dropped in the 1.6 16v (~70kw) and don't want to lose the effectiveness of the extra 10kw by gearing down the diffs to 3.9's. Ideally I would like some 4.1 WT maruti centres, but they are hard to find.

If I have to I have some 32's here I can use, but they will require some trimming mods that I really didn't want to do at this point.

Pete

[mrRocky]

i have 2x 4.1 diffs i would sell but alas im in perth

[Gutless]

all I need is the ring and pinion gears.

How much would you want for them?

[Gwagensteve]

I get 4052 rpm @ 100km/h based on an actual tyre diameter of 30.5".

I think it will OK- I've built a car that runs near 4K @ 100 and it's fine. It has a fairly quiet exhaust though.

Steve.

[31zook]

Im not keen on running my car past 3500 down a highway for ages so i would say go for it and get slighly bigger tyres....

[Gwagensteve]

Suzuki were happy to release the Jimny running 4K @ 100 - stock.

4K won't hurt the 1.3.

Steve.

[Gutless]

Suzuki were happy to release the Jimny running 4K @ 100 - stock.

4K won't hurt the 1.3.

Steve.

I have a 1.6

I think it will be fine too. I don't do long distance highway ( bout 1hr max at a time) so I'm not too concerned with 4K-ish.

My swift sport does 4200 @ 110 so whats the difference really?

[mr green]

all I need is the ring and pinion gears.

How much would you want for them?

when the father in-law owned my maruti, he paid around $340 for a ring and pinion new through suzi care.
ps. the 4.3 out of the gv front would be favourite diff ratio, might also be a good compromise if their price is right

[Gutless]

Yeah the 4.3 would be better.

Does anyone out there with 4.3's wanna swap for 4.6's?

[sic_zook]

peter just run the 4.6 gears n try them i ran 5.1 with efi 1.6 n a cut n shut n 31s n it was around about 4g but could put your foot down n get about 140 out of it in 5th without hiting the limiter

[christover1]

I run 4:9 diffs, 1.o litre t-case and a 1.3 5speed with 31's
Off road brilliant, on road acceptable, but could use a 6th gear at times.
I think 4:6's would be ok, inho.
4:6 was my choice, but when I got home, had 2 x 4:9's so I went with that
NB to myself. Check your ratios before buying, make sure both ends same

[Gutless]

Alright, thanks for all the comments fellas.

I'll try the 4.6's with 235/85 16's and see how it goes.

Cheers
Peter