|
|
04-25-2010, 06:27 PM | #1 |
BimmerPost Supporting Vendor
983
Rep 13,780
Posts |
dinan 4.10 diff installed and broken in
so i posted a little while ago about getting this diff installed and was almost talked out of it for a few reasons
1. the huge gas mileage decrease, 2. top speed loss 3 higher revs and 4. more shifting and only feeling faster not actually being faster as said by a few people well after breaking in the diff and actually getting on it.. well its a completely transformed car 1. i haven't noticed any real losses, it really just depends how you drive i guess, and being this car has a high performance v8 gas guzzler as it, a few less miles dont really mean to much i guess. 2. ive lost about 5-10 miles in each gear after 3rd, i haven't really redlined it since i would have to be going pretty quick to be in those gears to get there and weather hasn't permitted it currently. but the car accelerates so much quicker then stock, it feels like an entirely new car. 3. the car revs about 400-500 higher in each gear which explains the need for more shifting (4) and less top end speed, but like i said since it gets there so much quicker it doesnt bother me at all, i can also say i haven't noticed my self shifting more but less and imo i think it has to do with the car being able to hold higher speeds in higher gears, with that being said my gas milage around town and the highway hasnt decreased but maybe increased due to being able to stay in higher gears on the highway with less shifting when traffic slows down im not a mechanic and am in no way implying with any of this that i know more about cars, so to others what im saying can sound crazy but im only going by observation. im sure on the track this might be the complete opposite which is what i think people were getting at. all in all i can say im very happy with with this product and for the price i payed i have no regrets and i would highly recommend it for someone looking for a good bang for the buck the car is faster! it doesnt just feel faster hope this helps anyone considering this mod and since installing this there is no sign of the m clunk! Last edited by jeff@autocouture; 04-25-2010 at 06:48 PM.. |
04-25-2010, 08:06 PM | #3 |
Major
33
Rep 1,007
Posts |
Why would they be with a different gear ratio? Isn't speed measured by the number of wheel rotations?
__________________
E90 Interlagos Blue, (Winter Beater) Bamboo Beige, M-Drive, EDC, PDC, USB 6MT.
Mods to date; Curb rash, Scraped front spoiler, Installed RAC Monolite RG63 Silver 1984 Porsche 911 Carrera Coupe (ROW) |
Appreciate
0
|
04-25-2010, 08:30 PM | #5 |
Major General
265
Rep 5,018
Posts |
The real fuel penalty is at higher speeds, due to higher revs. Yeah, going 40 mph in 5th rather than 4th (at similar rpm) is not going to matter much. The problem is when you can't shift to 7th .
Do you track your car? I can't imagine running even higher rpm on the highway than already am; 3K rpm at 70 mph in 6th it's just ridiculous on a V8 car, even with a high redline like ours. You're probably turning 3,500 rpm now . |
Appreciate
0
|
04-25-2010, 08:48 PM | #6 |
BimmerPost Supporting Vendor
983
Rep 13,780
Posts |
I haven't tracked yet and I'm not sure if I'm going to use this, atleast not right away. I have a r32 being turboed and set up for the track ( long story) and that's also why I said it depends how you drive, if your drive normal following the speed limit you'll get better gas milage lol. But I use the car for more traveling then anything so it does it's purpose well, I'm sure once I get it track ready I'll Cry at how fast I go through gas :.(
|
Appreciate
0
|
04-25-2010, 10:52 PM | #7 | |
Major
33
Rep 1,007
Posts |
Quote:
__________________
E90 Interlagos Blue, (Winter Beater) Bamboo Beige, M-Drive, EDC, PDC, USB 6MT.
Mods to date; Curb rash, Scraped front spoiler, Installed RAC Monolite RG63 Silver 1984 Porsche 911 Carrera Coupe (ROW) |
|
Appreciate
0
|
04-26-2010, 12:02 AM | #8 |
Bla!
82
Rep 908
Posts |
this is something I've being looking to get. But damn.... dropping 4300 bucks for it is a bit..... well... too much
__________________
......................::.........................
|
Appreciate
0
|
04-26-2010, 01:28 AM | #9 |
BimmerPost Supporting Vendor
983
Rep 13,780
Posts |
Vw r32 bored out to a 3.3 with full intervals and a gt4088r, but I ddint pay that much
I got the 20% off from dinan it was 2000 for the diff 160 for fluid 170 to ship it and 700 installed at the dealer so I didn't have to put the deposit down either I looked at some other company but for the price difference it was worth getting it from dinan just for a piece of mind I'm not usually one to go out and purchase dinan parts but anything I've ever gotten from them has turned out to be a great product |
Appreciate
0
|
04-26-2010, 01:53 AM | #10 |
Captain
63
Rep 672
Posts
Drives: E92 M3, E30 M3, 1M, F10 M5
Join Date: Sep 2008
Location: Singapore & San Fransisco
|
My 3.62 Diff was definitely one of the best mod out there.. especially for DCT as I don't have to worry about an extra shift on the track.
Made my city driving a lot more pleasurable too... There are other alternatives other than Dinan - diffsonline.com based out of Massachusetts also make them. Pricing is a little better. They are a very reputable in the motor sports community. |
Appreciate
0
|
04-26-2010, 03:55 AM | #11 |
Captain
55
Rep 780
Posts |
Glad that you are enjoying the new diff - BMW really should have gone with a 4.10 diff in the 6MT from the factory given the relatively tall gearing of the 6MT box..
The laws of physics are such that in reality changing the diff does not actually equate to a consistent gain like what adding power to your engine does, but there is no doubting that a higher final drive ratio certainly affects the butt dyno... |
Appreciate
0
|
05-10-2010, 07:06 PM | #13 |
Major
159
Rep 1,288
Posts
Drives: 2014 435iX, FBO
Join Date: Mar 2009
Location: Ontario, Canada
|
Hi, yes please let us know what you are reving at in a variety of speeds if you would. I am seriously considering this mod too.
Mainly 3rd and up I would guess - 80k/50 mph - 3, 4, 5, and 6th 100/62 mph - 3, 4,5, and 6th 120/70 140/90 160/100 If you could show us those, that would be really great. Thanks |
Appreciate
0
|
05-10-2010, 07:42 PM | #14 | |
Captain
55
Rep 780
Posts |
Quote:
1st: 0.007587214 2nd: 0.012986979 3rd: 0.019447632 4th: 0.025810531 5th: 0.030766153 6th: 0.035282286 To calculate RPM at given speed, divide speed (must be in kph) by appropriate multiplier above for the gear you are looking at. E.g. 50kph in 3rd gear = 50/0.019447632 = 2571 RPM E.g. 100kph in 4th gear = 100/0.025810531 = 3874 RPM To calculate speed (in kph) at given RPM, mulltiple RPM by appropriate multiplier above for the gear you are looking at. E.g. 4000RPM in 3rd gear = 4000 * 0.019447632 = 77.8 kph E.g. 4000RPM in 5rd gear = 4000 * 0.030766153 = 123.1 kph Note the above multipliers are based upon car with factory 18in wheels (265/40) running 4.10 FD ratio. |
|
Appreciate
0
|
05-10-2010, 09:41 PM | #15 |
Lieutenant Colonel
68
Rep 1,676
Posts |
i am in the process of breaking mine in now, i love it already and haven't gone over 5krpm's so i know i am gonna love it even more. just from the spirted driving i hsve done under 5k the car def feels like a new car, much better. these are the gears that should have come stock
__________________
Street- 08 E92 M3- Sparkling Graphite/ Fox Red/6sp
Track- 10 CRF 250-PR2 Race Motor/Ohlins TTX Susp Hauler- 06 Ford Skyjacker F250 4WD |
Appreciate
0
|
05-10-2010, 09:41 PM | #16 |
Lieutenant Colonel
68
Rep 1,676
Posts |
where did you get that price from?? i paid alot less then that for mine
__________________
Street- 08 E92 M3- Sparkling Graphite/ Fox Red/6sp
Track- 10 CRF 250-PR2 Race Motor/Ohlins TTX Susp Hauler- 06 Ford Skyjacker F250 4WD |
Appreciate
0
|
05-10-2010, 11:44 PM | #17 |
Bla!
82
Rep 908
Posts |
well, I was including the core charge. But yes I've been flirting with this option instead of getting wheels.
__________________
......................::.........................
|
Appreciate
0
|
05-11-2010, 01:09 AM | #18 |
Lieutenant General
634
Rep 10,407
Posts |
While still observing the redline is what you mean right?
From a more general point of view: Everyone interested in the higer FD ratio modification should read the extensive debates and analysis of their performance. In the M3 (and in many other cars) they help feel and in gear performance much more than times for 0 to speed X results or for times from one speed to another when shifts are involved. See thread here. As mixja pointed out in this thread a 5% power bump will do a lot more for overall performance than a diff. In my humble opinion (and based on my analysis/simulation) the benefit per dollar for a FD mod is way too low to bother. Without very accurate testing all you have is feel and that is largely based on in gear results. You should really rely less on the butt dyno - they tend to deceive us - often.
__________________
E92 M3 | Space Gray on Fox Red | M-DCT | CF Roof | RAC RG63 Wheels | Brembo 380mm BBK | | Vorsteiner Ti Exhaust | Matte Black Grilles/Side Gills/Rear Emblem/Mirrors | | Alekshop Back up Camera | GP Thunders | BMW Aluminum Pedals | Elite Angels | | XPEL Full Front Wrap | Hardwired V1 | Interior Xenon Light Kit | |
Appreciate
0
|
05-11-2010, 07:57 AM | #19 | |
Major
159
Rep 1,288
Posts
Drives: 2014 435iX, FBO
Join Date: Mar 2009
Location: Ontario, Canada
|
Quote:
1) 1st gear I hear from others in this thread I think that 1st is now unusable due to traction or too short.... what is the real life experience when you tromp it off the line, or pull away hard. 2) from 2k to 5k can you describe the feel difference compared to stock please - I think this is where the diff really comes in. Once the thing explodes past 5-6k, you don't need the torque. 3) are you breaking traction a lot more now and can't get the torque down to the road - this would be a major issue for me. Thanks PS: Is there anyone in the Toronto, Ontario area that has this done? I would love to go for a ride before I do it. |
|
Appreciate
0
|
05-11-2010, 01:28 PM | #20 | |
Lieutenant Colonel
68
Rep 1,676
Posts |
all you are basing it off of is stuff you read no real life experience correct?? if you have real life experience btw a car with a diff and one without then i take it back
he actually has real life exp with the two to compare. i don't care what you post or graphs you show nothing beats real life experience i haven't even broken mine in yet and i can already tell the car pulls harder and is faster through the gears. def one of the best band for the bucks mods Quote:
__________________
Street- 08 E92 M3- Sparkling Graphite/ Fox Red/6sp
Track- 10 CRF 250-PR2 Race Motor/Ohlins TTX Susp Hauler- 06 Ford Skyjacker F250 4WD |
|
Appreciate
0
|
05-11-2010, 01:33 PM | #21 | |
Lieutenant Colonel
68
Rep 1,676
Posts |
i am still in break in for it so i haven't be able to get on it yet to hard more of rolling out then going kinda of thing. i wouldn't say 1st is useless but you will use it alot less now. alot of times you can just roll out in 2nd or shift right away to 2nd
i can def feel it pull harder and faster through 2-5k where the car needs it in my op and with my midpipe it is now awesome. once i am able to really tromp on it i can give you a better idea but i can feel it already and that is with taking it easy i don't think it will be breaking traction real bad. nothing like my Dinan S2 M5 did off the line and down low, that thing i would have to skip first bc it would break so bad. this car doesn't have that low end tq to do that in my op will keep you posted Quote:
__________________
Street- 08 E92 M3- Sparkling Graphite/ Fox Red/6sp
Track- 10 CRF 250-PR2 Race Motor/Ohlins TTX Susp Hauler- 06 Ford Skyjacker F250 4WD |
|
Appreciate
0
|
05-11-2010, 03:25 PM | #22 | |
Brigadier General
242
Rep 3,306
Posts |
Quote:
That being said, it doesn't negate the pros of easier driving around down and perhaps the ability to move in traffic as it slows down and speeds up without shifting gears as often. Cheers, e46e92
__________________
"...it's not about the money and not about the brand of the car, it's about handling,performance and passion......And that, no other car has all together like an M3........when you talk about the most complete car the M is invincible." --Tony Kanaan. |
|
Appreciate
0
|
Post Reply |
Bookmarks |
|
|