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Diff ratios

Tech Talk for Cruiser owners.

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Posts: 35
Joined: Sat Nov 13, 2010 11:23 am

Diff ratios

Post by cruise75 »

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.
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Re: Diff ratios

Post by dogbreath_48 »

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.
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Re: Diff ratios

Post by SCANAS »

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
I'm not quitting drinking, I'm retiring at the top of my game - sporting comeback likely.
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Re: Diff ratios

Post by cruise75 »

Thanks guys. not sure what hes running either but will askk at next meet. It is at indicated KPH. Dont trust GPS readings
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Re: Diff ratios

Post by brissle »

trust the gps not your speedo
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Re: Diff ratios

Post by HUNTERLUX »

Also are they both the exact same running gear eg turbo or not petrol or diesel ect ect
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Re: Diff ratios

Post by cruise75 »

Both 1HZ models
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Re: Diff ratios

Post by CustomTurbos »

Does a stock 1HZ even have enough torque to push 100km/h at 1800rpm?

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
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Re: Diff ratios

Post by cruise75 »

Have had the ol girl out to 125, but shes revving
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Re: Diff ratios

Post by Mulcahy »

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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