01-20-2013, 12:45 AM | #1 |
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3.45/3.62 short ratio Diff anyone ??
nearly everything was discussed in terms of tuning the 1M (except RB's i guess ) however I couldn't find anyone interested in a short ratio diff.
Dinan offers 3.45/3.62 diff options which give 9.5% and 14.9% torque increase respectively, which seems nice for a diff upgrade only. these are listed under the M3 DCT which is identical to our diffs. anyone have experience in this? after some i found that biglare had this mod on his previous E90 M3. It would be nice to know everyones feedback!
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01-20-2013, 01:23 AM | #2 |
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The M3 needs more torque, not the 1M. IMHO we need a higher gear ratio to make better use of our torque.
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01-20-2013, 02:06 AM | #3 |
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When you cycle a bicycle uphill, you would normally change to a lower gear so it becomes easier to pedal. However, you would not normally use a lower gear to go downhill, which is what it would be like if you were to put shorter ratio gears on the 1M, you'd be shifting constantly on such a high torque vehicle, ..not to mention the loss of traction.
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01-20-2013, 02:32 AM | #4 | |
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car feels really strong when accelerating from a standstill but once speed increases things get a bit slow; wouldnt a 3.45 be realistic? another benefit is the car wont be cruising around the drony 2.2k rpm range
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'12 Candy Grey Metallic 1M Last edited by Stratus650; 01-20-2013 at 09:59 PM.. |
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01-20-2013, 09:19 AM | #5 |
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I would do it. the 1M has ver long ratios to the point that 6th is just overdrive. I personally like 6 full usable speeds.
I have 3.43 diff in my 130 and find it just perfect. this would make the 1M even more raw. |
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01-20-2013, 09:55 AM | #6 |
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1st gear would be useless.
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01-20-2013, 10:35 AM | #7 |
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Like everyone posted before, it has plus and minus to add this mod, I would pass it unless the car is "mostly" used on highways where reaching high gears are possible/permitted (e.g. autobahn).
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01-20-2013, 08:54 PM | #9 |
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01-20-2013, 09:30 PM | #10 |
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Not sure I understand you. You can't compare a 130 to a 1M. The 1M's 6th gear has more than adequate passing power and is very useable. It is so useable in daily driving to the point where you can skip 5th. I wish 6th was more like an overdrive to improve highway fuel economy.
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01-20-2013, 09:57 PM | #11 | |
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a 3.45 will increase the rpm by 200 when cruising and a maximum of 600 at the redline, this is not a huge shift in ratio, i think we will need to control how we press the pedal instead of a sudden flooring hehe
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I usually cruise at 110km/h around the city so im always on 6th at 2200rpm, with a 3.45 it is going to be 2400rpm, again not a huge difference
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01-20-2013, 10:37 PM | #13 | |
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There's not 2,000 rpm to go in 6th rear with a stock 1M. Max power occurs between 5,500 - 5,900 rpm.
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01-21-2013, 02:05 AM | #14 |
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with a 3.45 diff it will be already 250km/h @ 5,600rpm, so in the max power range hehe
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01-21-2013, 07:57 AM | #15 |
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I was very sceptical about the fitting of a short ratio Diff and I tried a 1M with a short one fitted : it's so nice with it , the car is really faster and feels snappier, yes i know it's not a surprise but the 1M + short ratio diff is a so beautifull combination that i will have one installed in one month.
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01-21-2013, 11:51 AM | #16 | |
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so any details? what brand was the diff ? and what ratio if I may ask any more feedback on your unique experience would be appreciated.
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08-06-2016, 02:13 AM | #17 |
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Couldn't find a later thread, and, thought I'd bump this instead of make a new one too.
So, the M2 has the same ratios but 3.46 final drive. Despite engine differences I think the power curve is comparable. Might actually be a worthy upgrade to do. Yes 1st gear will be useless, you might have to shift to 3rd for 0-60 traffic light gps and suffer worse times. Should shine on the track esp with 3rd and 4th. |
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