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Old 9th September 2008, 21:46   #1
justblaze
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INCREASE BOTTOM END TORQUE?

What's the best way to increase the bottom end torque on the E60 M5's?
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Old 9th September 2008, 22:01   #2
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3.91 diff and headers...
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Originally Posted by justblaze View Post
What's the best way to increase the bottom end torque on the E60 M5's?
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Old 9th September 2008, 22:26   #3
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Quote:
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3.91 diff and headers...
Got to be specific on headers, not all the headers give you low-end torque. More likely, equal-length headers like RPI, SS, new RDSport, or Turner.
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Old 9th September 2008, 22:28   #4
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ASR (or RPI) Nos or Dinan Stroker.

Ranger, note that I am giving props to the Nos by listing it first!
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Old 9th September 2008, 23:03   #5
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1) 3.91 Diff = ab $3k
2) Headers = anywhere from $5-8k
I think NOS and the stroker will increase everywhere, while the diff focuses more on increasing tq and the headers help with tq and hp
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Old 9th September 2008, 23:06   #6
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Quote:
Originally Posted by Laidback View Post
3.91 diff and headers...
Does anyone besides Laidback agree on the 3.91 differential? Is it a must have mod? I've read alot of posts about the issues with the dinan 3.91 but nothing about Evos diff except that it is great. On the other hand, although some people have praised Evos diff, they still changed it back to stock as it was hindering their top speed. When you come to think of it, is it worth the hassle & cost of removing the 3.91 diff for the sole benefit of high speeds? Personally, I'd prefer having a better low end torque rather than reaching top speeds faster. How many times would you actually hit high speeds 20, 30 times may be more, but for people who drive their cars on daily basis, I believe having a better low end torque is more beneficial.

I do appreciate your opinion in this regard.
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Old 9th September 2008, 23:18   #7
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I'm about to dive in and get the diff in the next few weeks. Here's the thread that convinced me:
Rear diff is in... DINAN 3.91
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Old 9th September 2008, 23:26   #8
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Quote:
Originally Posted by G ///McGregor K View Post
I'm about to dive in and get the diff in the next few weeks. Here's the thread that convinced me:
Rear diff is in... DINAN 3.91
Because of that thread, I was also tempted to get the diff. I'm still unsure. I'd very much would like to hear from those who actually were happy with the diff and then removed it. It doesn't make sense
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Old 9th September 2008, 23:30   #9
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I'm not an engineer, so my opinion is strickly as an M5 owner. Our cars need more torque of the line. 1st gear is weak and under hard acceleration the car seems to bog. After changing to a Dinan 3.91 diff, the difference was drastic. As far as top end speed, the M5 tranny is able to accomplish the high MPH while still having more RPM's to go. If you are drag racing, the trap speed with the 3.91 is going to be lower, but your time is also lower. Stock diff gives a higher MPH trap speed because your 1/4 mile time is longer. Best mod for the money. Unless your running NOS and then you want the stock diff for the added horse power. Any Engineers care to explain?
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Old 9th September 2008, 23:30   #10
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if you want to feel more lowend.. i'd get the rpi pulley.
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