Dinan 3.62 M-DCT diff

[yoelev]

Originally Posted by chris3g

i guess it depends on what you are looking at. You should be looking at the lowest numbers for each run, because nobody is going to do a 60-130 run and start in 6th gear. In that case you would expect the 3.62 gears to be just about 15% faster, and it is.

1/4 mile 3.62 is 1/10th faster, 60-120 3.15 is 2/10ths faster, 60-130 3.62 is .5/10th's faster. Overall it's really close.

It's not the time of the shift that is important, it's that with the 3.62 gears you are shifting into the next gear 15% sooner, during that time the car with the stock gears is putting more torque to the ground because it is still in the lower gear.

I'm not saying it isn't a good mod, obviously the improved feeling of torque is a big plus. I just wouldn't expect any actual increase in performance.

but how does your last sentence square with your first one? you say the 3.62 is 15% faster but then you say i wouldn't expect any actual increase in performance.

[BASELINE]

Originally Posted by yoelev

but how does your last sentence square with your first one? you say the 3.62 is 15% faster but then you say i wouldn't expect any actual increase in performance.

He was referring to only the acceleration runs started in a gear that is unnecessarily too tall for that particular pull. For example... If 3.15 and 3.62. Start in 5th gear at 60mph... The 3.62 car, as it should would have a 15% advantage. But in any "right" gear runs its a wash... i.e. the 3.62 car would fare better in a shiftless passing maneuver but if both cars downshift there is no advantage.

I'd be curious to know what the MPG difference is... I meant... Stock it sucks ass, but just curious how much worse is it. What have you seen?

[yoelev]

Originally Posted by BASELINE

He was referring to only the acceleration runs started in a gear that is unnecessarily too tall for that particular pull. For example... If 3.15 and 3.62. Start in 5th gear at 60mph... The 3.62 car, as it should would have a 15% advantage. But in any "right" gear runs its a wash... i.e. the 3.62 car would fare better in a shiftless passing maneuver but if both cars downshift there is no advantage.

I'd be curious to know what the MPG difference is... I meant... Stock it sucks ass, but just curious how much worse is it. What have you seen?

i have never reallly paid to much attention to the mpg of this car, it really misses the point. i do 14.5 mpg. that's it. i will be more civil this weekend as i am taking my sis in law out to the beach so will re check. but i have no "prior" to go on.

[Mrbig]

Sounds like a mod I need to do and I'm leaning towards the 3.45 just for some added torque and not a huge issue top speed and hopefully help my 1/4 mile times overs stock.

[yoelev]

Originally Posted by Mrbig

Sounds like a mod I need to do and I'm leaning towards the 3.45 just for some added torque and not a huge issue top speed and hopefully help my 1/4 mile times overs stock.

every mod i have done from dinan has been fantastic. couldn't be happier

[Mrbig]

Hoping ill love it also ! Helps my 1/4 !!!

[CanAutM3]

Originally Posted by yoelev

I have it on my 2012 e92 and although i havent dynoed it, it certainly feels MUCH faster.

There is no point in putting it on a dyno since a diff will not change the power output.

[yoelev]

Originally Posted by CanAutM3

There is no point in putting it on a dyno since a diff will not change the power output.

well that's good to know. the main point is that this thing is awesome and i love it. would recommend to anyone who was thinking about it. in fact, all the stuff i did just makes this car better and better

[eeeboy]

I went back and forth too..all the debate over how it not faster etc etc...well I dont give a crap about the numbers...all i care about is my butt dyno....and I must say I absolutely love it...lets face it, from 0-15 in first gear the 328 feels faster...its a blast...also my gas mileage is better because I dont feel the need to rev it up all the time to get the torque rush...some of us just love torque....and the m3 lacks it

[buddster]

With the 3.62 or 3.45, where do you feel the difference? Is it down low, say under 3k or in the midrange between 3k and 5k? Would that show on a dyno?