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| Slick |
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Hi guys
Whos running 3.7 ratio on their cars? I like to know what rpm you're sitting on at a 100 kmh on level freeway cruising. I'm doing 1900 to 2000 rpm on overdrive at 100K's with 3.45:1 ratio. got a quote for 4.11 crown & pinion for 250 to 300 bucks installed {in stock, secondhand} but I think its to high for freeway usage. Just waiting for them to call back if they can source a 3.7 or 3.9s. Should I go 4.11? 
_________________ Mind f**k!!! it works on feeble minded ignorant sheeples... there's plenty of em on this site... some are very intelligent but by god they are so thick!!! Pakrat wrote: You can buy them seppertly
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| EFFalcon |
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my car does 2050rpm @ 100 in 4th gear on the auto with a 3.45 diff.
3.7 would have it at 2200rpm @ 100 3.9 would have it at 2325rpm @ 100 4.1 would have it at 2450rpm @ 100 really not THAT bad... but then keep in mind you'll often do 110/120
_________________ FALCN6 - EF GLi Turbo, 20" Rims, Air Bag Suspension, Straight LPG, 225rwkw |
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| Mr Man |
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just out of curiosity, what would are the RPM figures for 3.08, 3.23 and 3.45 diffs at 100km/h and 110km/h with an auto???
_________________ 300+rwkw HeadsexTuned XR6 Turbo Ute *NOW SOLD |
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| EFFalcon |
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3.08 = 1830 @ 100
3.23 = 1920 @ 100 these are all as per my car. my speedo is accurate to 1% (police spec cluster adjusted to suit tyres/diff)
_________________ FALCN6 - EF GLi Turbo, 20" Rims, Air Bag Suspension, Straight LPG, 225rwkw |
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| Slick |
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EFFalcon wrote: my car does 2050rpm @ 100 in 4th gear on the auto with a 3.45 diff. I like the look of 3.7. Hold on, the 4.1 looks tempting since they got it on shelf. hehehe
3.7 would have it at 2200rpm @ 100 3.9 would have it at 2325rpm @ 100 4.1 would have it at 2450rpm @ 100 really not THAT bad... but then keep in mind you'll often do 110/120 thanks guys.
_________________ Mind f**k!!! it works on feeble minded ignorant sheeples... there's plenty of em on this site... some are very intelligent but by god they are so thick!!! Pakrat wrote: You can buy them seppertly
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| MikGan |
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How sure are you of those numbers? I know my wheels may be a different size but the differnce is massive in 4th 1:1 with 4.11 diff I sit on almost 3500rpm @ 100 thats almost 1000rpm difference to the numbers your giving there! think u may need to go back to the calculator.
_________________ I couldnt fix your brakes so I made your horn louder
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| EFFalcon |
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you just said it..
4th gear... mines an auto 4th gear = overdrive.
_________________ FALCN6 - EF GLi Turbo, 20" Rims, Air Bag Suspension, Straight LPG, 225rwkw |
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| Slick |
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MikGan wrote: How sure are you of those numbers? I know my wheels may be a different size but the differnce is massive in 4th 1:1 with 4.11 diff I sit on almost 3500rpm @ 100 thats almost 1000rpm difference to the numbers your giving there! think u may need to go back to the calculator. s**t!!!!!!!!!!!!!
looks like 4.11 is out of the question. Whats 3.7 & 3.9 like then?
_________________ Mind f**k!!! it works on feeble minded ignorant sheeples... there's plenty of em on this site... some are very intelligent but by god they are so thick!!! Pakrat wrote: You can buy them seppertly
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| Mr Man |
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EFFalcon wrote: 3.08 = 1830 @ 100
3.23 = 1920 @ 100 these are all as per my car. my speedo is accurate to 1% (police spec cluster adjusted to suit tyres/diff) thanks for that 
_________________ 300+rwkw HeadsexTuned XR6 Turbo Ute *NOW SOLD |
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| EFFalcon |
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These are theoretical calculations:
4 Speed Auto - 4th gear 0.68:1 235/45/R17 tyres 3.08 = 1727rpm 3.23 = 1811rpm 3.45 = 1935rpm 3.70 = 2075rpm 3.90 = 2187rpm 4.11 = 2305rpm a little different to what my car actually does 
but its still a good estimate. using this program: http://locost7.info/gearcalc.php
_________________ FALCN6 - EF GLi Turbo, 20" Rims, Air Bag Suspension, Straight LPG, 225rwkw |
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| justfordima |
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I had 4.11's in mine... you would be doing the same RPM you are doing now but 20K's slower.
I had to take off in 2nd sometimes... seroiusly not practical. and I don't go on the highway.. so around town it's not that great. Took off well though, traction is an issue. Now with 3.45's. Heaps better. Cheers
_________________ ;++JustForDimSim++;
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| XITED6 |
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i have 3:45's. XR diff. so i really had no choice.Happy with them though. But if i was to choose id go 3:70's
Contact Preston diif's & auto's. St georges rd preston. Have a chat to them.
_________________ AU II XR6 Hp 5 Speed. |
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| phongus |
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not to steal the post. but i have a EA Ford Fairmont with a 3 speed. whats the diff on mine?
cheers phong
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| EFFalcon |
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most likely a 2.77
_________________ FALCN6 - EF GLi Turbo, 20" Rims, Air Bag Suspension, Straight LPG, 225rwkw |
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| prydey |
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for those with manual (t5) 5th is 0.72 so @ 100 in mine (3.45) it sits around 2150.
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