Lets talk gearing / gear ratios

[sae70]

OK so now I've decided to go for the 255/85/16 tyres How's this going to effect my gearing

Comeing from the Vitara community an increase in tyre diameter of this percentage over standard would have a dramatic effect on gear ratios generaly resulting in the effective lose of the use of 5th gear unless on the flat with the wind behind you The fix for this would be to change the diff ratios but as this was such an expensive option with a distinct lack of after market 5.8 R&P's available people didn't bother & just lived with the lose of 5th gear I started to play with increasing engine power to help overcome the increase in tyre diameter with very good results For example the V6 vit would have 4.3 R&P's & the 1.6 would have 5.125 R&P's so in my mind increasing the power of the 1.6 engine towards that of the V6 would counter the effect of the larger diameter tyres & it worked

So what will I notice with regards to the performance of Fiery after fittingthe larger diameter tyres

What are the gearbox & R&P ratios for each model of Collie & Prado, petrol & diesel, auto & manual, LWB & SWB

Is there a list somewhere that someone could post a link up for me

 

[Chris]

I really don't think that you want to go there. That is a mountain of work. The 90 has so much torque I think you'll be fine with the change from 31 to 33 inches.

I shall give you a ring in a bit about tonight. Been busy on the car this morning and only just come in.

C

 

[sae70]

The 90 has so much torque I think you'll be fine with the change from 31 to 33 inches.

That's good news

I shall give you a ring in a bit about tonight. Been busy on the car this morning and only just come in.

Just sent you another PM before reading this Cool I look forward to your call

 

[chris lc90]

OK so now I've decided to go for the 255/85/16 tyres How's this going to effect my gearing

Comeing from the Vitara community an increase in tyre diameter of this percentage over standard would have a dramatic effect on gear ratios generaly resulting in the effective lose of the use of 5th gear unless on the flat with the wind behind you The fix for this would be to change the diff ratios but as this was such an expensive option with a distinct lack of after market 5.8 R&P's available people didn't bother & just lived with the lose of 5th gear I started to play with increasing engine power to help overcome the increase in tyre diameter with very good results For example the V6 vit would have 4.3 R&P's & the 1.6 would have 5.125 R&P's so in my mind increasing the power of the 1.6 engine towards that of the V6 would counter the effect of the larger diameter tyres & it worked

So what will I notice with regards to the performance of Fiery after fittingthe larger diameter tyres

What are the gearbox & R&P ratios for each model of Collie & Prado, petrol & diesel, auto & manual, LWB & SWB

Is there a list somewhere that someone could post a link up for me

Toyota Prado 4x4
station wagon, 5 seats (+2), 4 doors, ABS + twin air-bag (+seat-belt pre-tensioners) optional
loa: 4730mm, width: 1730mm, height: 1865mm track: 1475mm/1480mm, grnd clearance: 230mm
turning radius: 5.7m (kerb)
weight: 1720kg - 1805kg (unladen), GVM: 2710kg, towing: 750kg (unbraked)
3.4L V6:
5VZ-FE, 3378cc, petrol, V6, efi, 4-valves/cyl, DOHC (per bank)
bore: 93.5mm, stroke: 82mm, c.r.: 9.6:1
transmission: 5m/4a, full-time 4WD, centre diff' lock
gear ratios 5m: 3.830:1, 2.062:1, 1.436:1, 1.000:1, 0.838:1 (4.22:1)
gear ratios 4a: 2.804:1, 1.531:1, 1.000:1, 0.753:1 (2.393:1)
transfer case: 1:1 (hi), 2.566:1 (lo); diff': 4.1:1 (rear LSD)2.7L 4-cyl:
3RZ-FE, 2694cc, petrol, 4-cyl, efi, 4-valves/cyl, DOHC
bore: 95.0mm, stroke: 95.0mm, c.r.: 9.5:1
diff': 4.3:1 (rear LSD)
3L turbo diesel
suspension: indep'-coil/live-coil, brakes: disc/disc
tyres: 215-80R16 (30" o.a.d.), fuel-tank: 90L (+ 69L RV6)
(GXL, VX: 265/70R16 tyres (31" o.a.d.))

i hope that i help u