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.3.91 diff and headers...
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 senseI'm about to dive in and get the diff in the next few weeks. Here's the thread that convinced me:
OT, i saw your sig. How u like the E63? Eloy got scoop for you as well, if you don't already have one.:blink:that was my thread , i loved the 3.91 all the way to the end !! i wouldnt get in this car without it !! i dont drag or go to the track i just wanted more around town and thats what i got !!
about 2 mo's ago when i got rid of the car i sold the diff to another member and i drove it around without it and it was just plain old slow !!
as per tightie's comments i'd say get the diff and pulley at the same time and them its game on !!
Richie, as soon as I got the email notification that you posted on this thread, I didn't even have to look at the thread to read what you wrote! I should have known that ASR plug was coming!ASR Gen II exhaust!!! Nice improvement down low and in the sound department as well.
lol...I am officially an ASR WHORE!!!Richie, as soon as I got the email notification that you posted on this thread, I didn't even have to look at the thread to read what you wrote! I should have known that ASR plug was coming!
JustBlaze -- I have heard nothign but good things ab ASR's exhaust. I'm getting my RPI Sec 1 and 3 put on in a week or so, I'll let you know if there's any improvement in the low end when I get her put on...
The good thing about the upgraded diff is there is constant power across the band, no heat soak:hihi:Got to be specific on headers:haha:, not all the headers give you low-end torque. More likely, equal-length headers like RPI, SS, new RDSport, or Turner.:blink:
+1. I love the 3.91 diff.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?