VT Diff Ratio's

[holdenvtman1123]

i would like to change my 3.07:1 ratio diff with one under 2.7:1. can it be done and how much? lower those revs at 110km/h.

[stocky]

...why bother

[holdenvtman1123]

it will use less fuel. im not interested in doing burnouts, just getting the best economy from the 5.0lt. i do mainly highway km's.

[stocky]

youll probably use more fuel struggling to get up to speed

[daron]

yeah more fuel
silly idea
if ya cant afford the 5ltr its time to sell

[SIG-054]

Lower your speed on the highway if you want to use less fuel. Simple

Sit on 100km/h rather than 110km/h, you'll notice the difference.

[holdenvtman1123]

check out the diff ratio's at this website. TORANA,SLR 5000,SEDAN,V8,5LT,L/O,LSD,F/SPL 2.78,3.08 if the slr can have 1 so can i http://www.difflap.com.au/ratios/hi.htm

[holdenvtman1123]

sitting on 100 instead of 110 is probably more dangerous. trucks will always be over taking me. there 105 speed limited.

[stocky]

check out the diff ratio's at this website. TORANA,SLR 5000,SEDAN,V8,5LT,L/O,LSD,F/SPL 2.78,3.08 if the slr can have 1 so can i http://www.difflap.com.au/ratios/hi.htm

torana is a much lighter car compared to a heavy VT

sitting on 100 instead of 110 is probably more dangerous. trucks will always be over taking me. there 105 speed limited.

maybe you need to learn how to drive with traffic then

[Full Spectrum]

@ 100 or 110 the car should be only using 6-7l/100.
And as stocky has said - getting there will hurt your economy more. Your town economy will struggle labouring the car up to speed.

[holdenvtman1123]

thats what im trying to achieve from my v8 is v6 economy. with the power there when i need it. it sounds good too. who can blame me for wanting my cake and eating it too. the new ve has a ratio of 2.90:1.

[daron]

a 5 ltr should be better on petrol than a v6 on highway cruising so ya don't wanna aim for v6 stats
make sure its always serviced and it should be fine or dare i say put it on gas (eeeek)

[stocky]

thats what im trying to achieve from my v8 is v6 economy. with the power there when i need it. it sounds good too. who can blame me for wanting my cake and eating it too. the new ve has a ratio of 2.90:1.

you wont have power there if you lower the diff ratio. i think id rather have a v6 with a 3.08 ratio than what youre suggesting.

[holdenvtman1123]

I service every 5000 km religiously. Most km's done are highway with stretches of over 200km on cruise without braking. Gas isn't an option as i like my boot space. I'm down around 10.3 litres per hundred on the highway 14-17 in town. i run standard tyres. Iridium plugs, NGK leads, Bosch coil, Bosch button n cap. Bendix brake pads. I'm quite fond of my 5.0lt and just want the best out of it. Maybe my gearbox or wheel bearings are letting me down.

[daron]

sounds like your already getitng the best out of her
use premium always youll gain 50 ks per tank

[Steven M]

just take all your interior out except for steering wheel and drivers seat and u'll get better economy

[red truck]

You could get it dyno tuned for economy, they can be used for good as well as evil.

[Full Spectrum]

But don't forget the new VE's are running more RPM up above 6500rpm. They would die for a 3.08 diff. They would pull much better and even save some fuel economy around town.

Maybe going to a manual would improve fuel economy, Then you tell the car when you want to shift and set your limit on fuel and performance. Then you can always have best of both worlds ?.

[johnvtls1]

even if it did save you 1 liter per hunderd kms the outlay is not worth it. say you do 500kms a week so you save 5 liters of petrol, times that by $1.20 a liter for petrol that equals a saving of $6 a week. if it cost you $500 to do this it will take you 83 weeks to recoupe your costs. worth it? no not really, and thats if it saves you any petrol which it probably wont.

[SIG-054]

thats what im trying to achieve from my v8 is v6 economy. with the power there when i need it. it sounds good too. who can blame me for wanting my cake and eating it too. the new ve has a ratio of 2.90:1.

If you want V6 economy then get a V6..

The VE 6L also have a 6spd auto with a very short 1st gear ratio, not to mention 100kw more power at the fly.

I bet if u shorten your diff ratio to a 3.7, you would be as better off on fuel as you are now, as there will be less load on the engine whist getting up to speed and at speed.

[crew chief]

You are gonna make it use more fuel as it would be under load more often, the trans is where you could make real gains, swap to a t56 or t6060. The six speed offers 2 overdrives getting those rpm's way down at cruising speeds shouldnt cost much more than 3 or 4 grand which you would save in fuel costs in under a decade