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what diff ratio to use with 20's 

 

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 Post subject: what diff ratio to use with 20's
Posted: Sun Jul 29, 2007 11:38 am 
Getting Side Ways
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hi fellas,

since putting 20's on the rear, my auto 4L ef is noticably slower on take off, so i'm going to fit taller gears, just not sure what to use. i have an LSD with 3.45 gears (out of XR6).

i'm leaning towards 3.9 but am tempted to bite the bullet and go 4.11.

i dont do much highway cruising, so the slightly higher revs at 100 dont worry me. but it has to be a daily driver. i dont drag but may do the quater just to satisfy my curiosity. my tyre size is 235 30 20.

opinions/ advise welcome. ta

 

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Posted: Sun Jul 29, 2007 11:54 am 
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I have 4.11's on my AU auto and run 19" rims. I wouldnt even bother with 3.9's, just get the 4.11's. Its not that much of a difference in the end but the 4.11's really do get the car off the line in a hurry. Just have to take it easy in the wet, wheel spin is now just a fact of life.

 

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Posted: Sun Jul 29, 2007 12:08 pm 
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thanks casper. how did you find the speedo was affected?

 

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Posted: Sun Jul 29, 2007 12:08 pm 
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4.11's Dont f**k around.... I run them with stock tire size :D:D:D.....and.........1 2 3 4 5 6..back off...Traction lol

 

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Posted: Sun Jul 29, 2007 12:16 pm 
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fordriver1 wrote:
thanks casper. how did you find the speedo was affected?

Speedo was affected pretty drastically actually. The 4.11's are about 20% shorter than the stock 3.45's however the 19" wheels are about 5% bigger than stock too. Basically, on mine, the speedo is almost exactly 15% slow. That means that when I drive I've got to be good at my maths lol.

115kph on the speedo is 100kph road speed.

I'll get around to putting in a corrector unit one day but I've gotten very used to it now and know what speeds are what. Only problem is the DTE gets a bit out of whack now so I dont bother even looking at it.

 

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Posted: Sun Jul 29, 2007 12:19 pm 
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scuse the blonde in me- DTE?

 

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Posted: Sun Jul 29, 2007 12:20 pm 
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Im thinking trip computer

 

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Posted: Sun Jul 29, 2007 12:29 pm 
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DTE - Distance to Empty.

 

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Posted: Sun Jul 29, 2007 12:37 pm 
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thats ok. i dont have a trip computer. and im used to it cause i tow a caravan behind my ba ghia. the distance to empty drops 10 kays every 6 i drive!

 

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Posted: Mon Jul 30, 2007 12:17 am 
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Casper wrote:
fordriver1 wrote:
thanks casper. how did you find the speedo was affected?

Speedo was affected pretty drastically actually. The 4.11's are about 20% shorter than the stock 3.45's however the 19" wheels are about 5% bigger than stock too. Basically, on mine, the speedo is almost exactly 15% slow. That means that when I drive I've got to be good at my maths lol.

115kph on the speedo is 100kph road speed.

I'll get around to putting in a corrector unit one day but I've gotten very used to it now and know what speeds are what. Only problem is the DTE gets a bit out of whack now so I dont bother even looking at it.
one bright way of looking at it.........................

least its a good way that if you still stick with what the speedo reads... then you will have lil trouble with speeding fines... :lol:

 

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Posted: Mon Jul 30, 2007 12:20 am 
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fordfreak ef wrote:
Casper wrote:
fordriver1 wrote:
thanks casper. how did you find the speedo was affected?

Speedo was affected pretty drastically actually. The 4.11's are about 20% shorter than the stock 3.45's however the 19" wheels are about 5% bigger than stock too. Basically, on mine, the speedo is almost exactly 15% slow. That means that when I drive I've got to be good at my maths lol.

115kph on the speedo is 100kph road speed.

I'll get around to putting in a corrector unit one day but I've gotten very used to it now and know what speeds are what. Only problem is the DTE gets a bit out of whack now so I dont bother even looking at it.
one bright way of looking at it.........................

least its a good way that if you still stick with what the speedo reads... then you will have lil trouble with speeding fines... :lol:

Also good when you have someone in the car that is "car-clueless" and floor it. The speedo moves VERY quickly... blows their minds :D

 

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Posted: Mon Jul 30, 2007 12:39 am 
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unopened lol casper your a fag. 92 mph lol
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Posted: Mon Jul 30, 2007 12:44 am 
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Damo wrote:
unopened lol casper your a fag. 92 mph lol

Only 92mph on that run.. ran a 14.61 at 95mph the very next run. Wish I could have gotten them together, would have been a nice run.

Might see if I can snag a 14.4 unopened before I give in the the inevitable and do the engine. That would keep me happy for a while.



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