[zuk_244]

One for the Vitara boys. Just want to know what rpm a Vitara runs at at 100kph and 110kph?

And on what gearbox,eg 3sp Auto, 5sp Manual, etc

Im just finishing up putting a G16B into the Sierra (1992) and the next thing on the list is a set of reduction gears. Im running 31s (30.5inch) and tossing up between 4.9s or 6.5 reduction gears.

Ive calculated it out what both should run at in 5th gear.

100kph 110kph
4.9s 3300rpm 3600rpm
6.5s 3400rpm 3750rpm

[shandy92]

mate i guess it depends on what you drive as to what gears you get. if you drive any sand then i wouldnt be going 6.5 as it would just be to low, so the 4.9's would be good. but if you mainly drive rock then the 6.5's might be better.

oh my vit with 29's, 5 speed man and 5:12 diff: 100kph-3100rpm, 110kph-3400rpm

[Microwire]

I've got a g16a notsure how much difference it is but I get 100kph for me is like half a mm under 3000rpm 5spd man on 30's all the rest stock

[shandy92]

oh and its hard to tell exactly where 100 and 110 are on the speedo, since i dont have a gps. so ^^^^^ are just a rough guide......keeping up with traffic.

[Damo]

I think you should check your calcs. I run ~31" tyre + 6.5 + 3.9 diffs and i'm doing about 4000rpm @ 100kph.

IMO go the 4.9s

[zuk_244]

Thanks for that. I was leaning towards the 4.9s.

I did the calc on this site http://www.lepayne.com/gears.html using
Diff ratio, 3.727
Tire size 30.5
4.9s high ratio 1.634
6.5s high ratio 1.691

Ofcourse it isnt always the same in theory as practice.

[zuk_244]

oh and i drive abit of everything. Im near for the Victorian High Country so it up sandy creek beds as well as steep rocky hills.
Thought id get the best gears for the road and just deal with the rest. Both would give a better then stock crawl speed.

[rick1970]

Damo wrote:

I think you should check your calcs. I run ~31" tyre + 6.5 + 3.9 diffs and i'm doing about 4000rpm @ 100kph.

IMO go the 4.9s

His calcs are good. 4000rpm with 31's (30.5"OD) + 3.9 + 6.5's should have you doing around 110/111kph

[shep]

rick1970 wrote:

Damo wrote:

I think you should check your calcs. I run ~31" tyre + 6.5 + 3.9 diffs and i'm doing about 4000rpm @ 100kph.

IMO go the 4.9s

His calcs are good. 4000rpm with 31's (30.5"OD) + 3.9 + 6.5's should have you doing around 110/111kph

mine on small 31s was 3400rpm at a true 100kph. 3.7 diff gears, 6.5s and 31s.


try this
http://auszookers.com/index.php?name=Fo ... ic&t=22756

[Microwire]

For what it's worth, my speedo was checked on the highway near melbourne said 90 was infact 98 not sure how accurate it is but hope it helps.

[Joe]

Mine with 5.12, 5 speed manual, G16B on 30's sits on 3500rpm at 100kph on the clock but my speedo is out a bit

[shandy92]

Joe wrote:

Mine with 5.12, 5 speed manual, G16B on 30's sits on 3500rpm at 100kph on the clock but my speedo is out a bit

thats more like 110kph joe, well thats pretty much what mine is at.

[FullyZooked]

Mine with standard 5.12 diffs, g16a, 5 speed and 235's sits on 3450rpm. Then 3750rpm at 110.

[zuk_244]

Thanks guys, that gives me abit more to go on.

[JrZook]

Think the question here is, what RPM is the G16 most happy at cruising on 100KPH in 5th or top gear.

Id say get her very close to ~3500 and you will be sweet! IMO stock vitara gearing always seemed to tall.

[TheRealCJ]

Sounds about right, honestly.

When I'm driving on the highway, my Vitara does about 3100-3300 RPM at 100KM/h. That's with 235/75R15s.

[got_bar_work]

My vit on 31 sits on 3200 at 110 in 5 and it's crap
Need to be over 3500
I drive most of the time on the freeway in 4 th
At 5200 she gets up and moves
3 gear overtaking

[got_bar_work]

Also I think there is to 5 speed gear boxes
Early ones had a lower 5 gear
I think it makes them rev about 200 rpm higher