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      04-25-2010, 06:27 PM   #1
studntloan
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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 studntloan; 04-25-2010 at 06:48 PM.
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      04-25-2010, 08:02 PM   #2
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mileage

Are you taking into account that your speedometer and odometer are falsely high?
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      04-25-2010, 08:06 PM   #3
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Quote:
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Are you taking into account that your speedometer and odometer are falsely high?
Why would they be with a different gear ratio? Isn't speed measured by the number of wheel rotations?
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      04-25-2010, 08:17 PM   #4
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The speed is accurate, we tested mayb a mile or 2 off but most speedometers are anyway by atleast a few miles
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      04-25-2010, 08:30 PM   #5
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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 .
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      04-25-2010, 08:48 PM   #6
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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 :.(
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      04-25-2010, 10:52 PM   #7
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Quote:
Originally Posted by Studntloan View Post
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 :.(
R32 VW or R32 Skyline? Both cool cars for sure.
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      04-26-2010, 12:02 AM   #8
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this is something I've being looking to get. But damn.... dropping 4300 bucks for it is a bit..... well... too much
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      04-26-2010, 01:28 AM   #9
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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
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      04-26-2010, 01:53 AM   #10
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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.
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      04-26-2010, 03:55 AM   #11
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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...
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      04-26-2010, 07:30 AM   #12
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what r revving at 120kmh?
its a great mod.
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      05-10-2010, 07:06 PM   #13
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Quote:
Originally Posted by niqui View Post
what r revving at 120kmh?
its a great mod.
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
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      05-10-2010, 07:42 PM   #14
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Quote:
Originally Posted by DaFish View Post
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
You can use the values below to calculate RPM at a given speed (or vice versa) for the MT 4.10 ratio:

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.
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      05-10-2010, 09:41 PM   #15
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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
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      05-10-2010, 09:41 PM   #16
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where did you get that price from?? i paid alot less then that for mine

Quote:
Originally Posted by zamm3k View Post
this is something I've being looking to get. But damn.... dropping 4300 bucks for it is a bit..... well... too much
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      05-10-2010, 11:44 PM   #17
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Quote:
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where did you get that price from?? i paid alot less then that for mine
well, I was including the core charge. But yes I've been flirting with this option instead of getting wheels.
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      05-11-2010, 01:09 AM   #18
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Quote:
Originally Posted by Studntloan View Post
3. the car revs about 400-500 higher in each gear...
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.

Quote:
Originally Posted by Studntloan View Post
well its a completely transformed car
...

i would highly recommend it for someone looking for a good bang for the buck
the car is faster! it doesnt just feel faster
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.
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      05-11-2010, 07:57 AM   #19
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Quote:
Originally Posted by H Bomb View Post
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
Hi H Bomb and Studntloan (or anyone that has actually done this). I am really interested to hear your real life experience on this.

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.
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      05-11-2010, 01:28 PM   #20
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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:
Originally Posted by swamp2 View Post
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.
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      05-11-2010, 01:33 PM   #21
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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:
Originally Posted by DaFish View Post
Hi H Bomb and Studntloan (or anyone that has actually done this). I am really interested to hear your real life experience on this.

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.
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      05-11-2010, 03:25 PM   #22
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Quote:
Originally Posted by H Bomb View Post
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
Right, but SWAMP's statements are based on engineering facts, not a butt dyno. We have debated this topic to death, and the science behind it is more accurate then anyone's "butt dyno comparison". What you gain in acceleration, you lose when you have to shift early and the stock car keeps going; trust SWAMP when he says many of us have been over this MANY times. The 3.62 may make it feel faster, but I can assure you its not.

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
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