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| skianef |
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Hey does anyone know what revs at 100km I would be doing If i change my diff gears to 3.7:1 in EF fairmont Auto?
How much more fuel would be used under normal driving?
_________________ LS1 power is the way the truth and the light!! |
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| downingj |
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I think MRNASTY has 3.7 diff gears??? PM him.
Mine has a 3.45 LSD and does around 2100 rpm at 100 kays, which (for me) is high enough. |
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| Disco Frank |
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be close to 2500/2700rpm
u can work it out u know... 
_________________ RIP SCOTT |
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| mrnasty |
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yes i have 3.73:1 gears. sits on 2300rpm at 100km/h and i really didnt notice much of a change in fuel economy. There would have been, but i didnt notice heaps of difference from 3.08:1 in regards to fuel cosumption. definatly better acceleration.
_________________ Cougar Zero makes my pants fit nice. |
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| falconkid |
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i have 3.91, and i'm doing about 2250 rpm at 100..
MR Nasty, is urs manuel or auto.?? JIM |
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| wild6 |
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ive got 3.9's in my xr8 manual and it sits at about 2400 at 100kmh (120kmh on the speedo)
id guess 3.9's would be between 2200rpm and 2300 rpm
_________________ series3 xr8 5 speed manual, pacemaker extractors, 3' exhaust, lowered cold air intake, k&n filter, interior, 3.9s
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| stockstandard |
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{USERNAME} wrote: u can work it out u know...
Yep, find what rpm your car does at a speed , then divide by your gear ratio and multiply by the ratio you want. so if I have a 3.23 diff and do 2100rpm at 100kph and am thinking about changing to 3.9's 2100rpm / 3.23 * 3.9 = 2535rpm
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| mrnasty |
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mine is an auto falconkid
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