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Diff Gear Ratio Question. 

 

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Posted: Wed Feb 28, 2007 1:11 pm 
Parts Gopher
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Location: sydney
NSW, Australia

i would say it depends on if you have a stock or modded engine
i have basically stock but big exhaust and extrators so i would have lost a little bottm end and gain top end so the diff helped bottom end heaps as now its got the power to actually spin my new 235 18's
my old 1/4 time was 16.1 @91 so top end was pretty fast for that slow time so my take off was very slow but now i can feel its so much quicker but haven't had the chance to test it yet but it kept up with a BA xr6t which was supprising
but if i could guess i would say very low 15sec quater...so about 1 whole second quicker
i will post up my next run when it happens
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Posted: Thu Mar 01, 2007 11:05 am 
Stock as a Rock
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My EBXR8 runs 19s, had 3.27 now has 3.73s (is manual) at 110km/h it sits on 2400rpm

 

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Posted: Thu Mar 01, 2007 12:23 pm 
Getting Side Ways
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Ride: 97 EL XR6

Power: 162 rwkw

Location: liverpool
NSW, Australia

if you know your sitting on 2000 rpm at 100km/hr, then the easy way is...

2000/3.45x3.7=2144
2000/3.45x3.9=2260
2000/3.45x4.1=2376

so lets just say you will be sitting on 2400 with a 4.11 ratio

 

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Posted: Mon Mar 19, 2007 1:06 pm 
Oompa Loompa
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Location: Liverpool
NSW, Australia

I have changed to a 3.45 out of an xr8 sprint diff , car accelerates much quicker now its a top mod.
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Posted: Mon Mar 19, 2007 3:35 pm 
Getting Side Ways
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Ride: BA XT, BA XR6T, ED Ghia 5.0

Location: Perth
WA, Australia

Does anyone happen to have the ratios of a BTR 4 speed auto? Googling and car forums doesn't seem to turn up much. :(

 

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Posted: Mon Mar 19, 2007 3:45 pm 
Fordmods Addict
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Ride: Falcon

Power: 237 rwkw

Location: Melbourne
VIC, Australia

1st 2.39:1 - 2nd 1.45:1 - 3rd 1.00:1 - 4th - 0.68:1

Pretty sure they are all the same.
That was from the FPV site, in the heritage bit.

 

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Posted: Mon Mar 19, 2007 5:05 pm 
Getting Side Ways
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Ride: Blown XR8

Location: Melbourne
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Yes and 5th in the manual's is 0.73.
4.11's would be nice hey Jared...
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Posted: Mon Mar 19, 2007 5:06 pm 
Getting Side Ways
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Location: Melbourne. SE
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LOL. heritage

 

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Posted: Fri Mar 23, 2007 10:39 am 
Oompa Loompa
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Location: Liverpool
NSW, Australia

My car seems to have lost a bit of power now, it cant chirp the tyres, even stalled up what could cause this problem.
Brad
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