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Diff ratios
Moderators: toaddog, Elmo, DUDELUX
Diff ratios
Can someone help me. My 75 series originaly had 31 x 10.5 tyres on it and was revving its arse off. I changed the tyres to 33 x 12.5 x 15. Not revving as hard but at 100 km/h it still revs at 2400 rpm. My mate has the same size tyres and his revs at 1800rpm. Is it the diff ratios?. If so how do i find out what my ratios are and what should they be? Cheers guys.
Re: Diff ratios
2400rpm sounds about right at 100km/h. To hazard a guess I'd say your diffs are the standard 4.11's. Nothing wrong with it, if you overgear it any more it'll be a pig to get off the line.
Don't know what setup your mate is running to cruise at 1800 rpm.
Don't know what setup your mate is running to cruise at 1800 rpm.
Tetanus rolling on 37's
Re: Diff ratios
x2 sounds like you have 4.11 ratio's to me. Your friend must have different ratios or transfer case gears?
Are you both talking indicated 100kph or a GPS or corrected read out
Are you both talking indicated 100kph or a GPS or corrected read out
I'm not quitting drinking, I'm retiring at the top of my game - sporting comeback likely.
Re: Diff ratios
Thanks guys. not sure what hes running either but will askk at next meet. It is at indicated KPH. Dont trust GPS readings
Re: Diff ratios
trust the gps not your speedo
Re: Diff ratios
Also are they both the exact same running gear eg turbo or not petrol or diesel ect ect
Re: Diff ratios
Does a stock 1HZ even have enough torque to push 100km/h at 1800rpm?
Sounds like tacho reading wrong......
Sounds like tacho reading wrong......
cruise75 wrote:Can someone help me. My 75 series originaly had 31 x 10.5 tyres on it and was revving its arse off. I changed the tyres to 33 x 12.5 x 15. Not revving as hard but at 100 km/h it still revs at 2400 rpm. My mate has the same size tyres and his revs at 1800rpm. Is it the diff ratios?. If so how do i find out what my ratios are and what should they be? Cheers guys.
LX470 1HDFTE
Performance Direct Bolt On Turbos for: 1HDT/1HDFT/1HDFTE/12HT/13BT/1VDFTV/1KDFTV
Performance Direct Bolt On Turbos for: 1HDT/1HDFT/1HDFTE/12HT/13BT/1VDFTV/1KDFTV
Re: Diff ratios
Have had the ol girl out to 125, but shes revving
Re: Diff ratios
i have a 2H engine with 31 inch tyres and i rev to 2500 with the 5 speed and can easily get 125 out of it it is reving but not flat out and i have 3.8 ratios
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