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      01-20-2013, 01:45 AM   #1
Stratus650
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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, 02:23 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, 03:06 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, 03:32 AM   #4
Stratus650
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Quote:
Originally Posted by bdaddylo View Post
The M3 needs more torque, not the 1M. IMHO we need a higher gear ratio to make better use of our torque.
agreed, this mod might not fully benefit the 1M acceleration from a stand still, but it would help acceleration on the move from higher speeds/gears.

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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Last edited by Stratus650; 01-20-2013 at 10:59 PM.
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      01-20-2013, 10:19 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, 10:55 AM   #6
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1st gear would be useless.
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      01-20-2013, 11:35 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, 09:34 PM   #8
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Quote:
Originally Posted by CarJunkie View Post
1st gear would be useless.
Isn't it already?
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      01-20-2013, 09:54 PM   #9
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Originally Posted by robertm View Post
Isn't it already?
Not with better tires, so I hear.
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      01-20-2013, 10:30 PM   #10
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Quote:
Originally Posted by maupineda View Post
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.
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, 10:57 PM   #11
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Quote:
Originally Posted by CarJunkie View Post
1st gear would be useless.
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

Quote:
Originally Posted by ozinaldo View Post
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).
+1

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, 11:00 PM   #12
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in this video it seems to reach 250km/k at around 5K rpm. 2000rpm more to go.

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      01-20-2013, 11:37 PM   #13
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Quote:
Originally Posted by maupineda View Post
in this video it seems to reach 250km/k at around 5K rpm. 2000rpm more to go.


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, 03:05 AM   #14
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Quote:
Originally Posted by bdaddylo View Post


There's not 2,000 rpm to go in 6th rear with a stock 1M. Max power occurs between 5,500 - 5,900 rpm.
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, 08:57 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, 12:51 PM   #16
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Quote:
Originally Posted by Superfly View Post
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.
Now you're talking !!

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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