Change the differential
#31
Originally Posted by my530i' post='428785' date='May 27 2007, 08:57 AM
At the top end, we're going to kiss his ...
#32
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My Ride: 2007 E63 AMG | Obsidian Black | Schwarzes Nappa | Black BirdEye Maple | Premium II Package | Electronic Trunk Closer | Parktronic
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-----------------------------------------
2005 545i Sport SMG | Ti Grau | Schwarzes Dakota | Anthracite Maple | Logic 7 | Nav
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HAHAHAHAHA... That's right, you both will be KISSING my ass after I beat the two of you.
Anyhow, as a result of changing my gearing to a higher number my top end will be affected negatively. Not really too worried. All that matters is I'll be putting down some serious torque down low.
Anyhow, as a result of changing my gearing to a higher number my top end will be affected negatively. Not really too worried. All that matters is I'll be putting down some serious torque down low.
#33
Originally Posted by vegastrashed' post='428808' date='May 27 2007, 10:46 AM
HAHAHAHAHA... That's right, you both will be KISSING my ass after I beat the two of you.
Anyhow, as a result of changing my gearing to a higher number my top end will be affected negatively. Not really too worried. All that matters is I'll be putting down some serious torque down low.
Anyhow, as a result of changing my gearing to a higher number my top end will be affected negatively. Not really too worried. All that matters is I'll be putting down some serious torque down low.
#34
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Joined: Sep 2005
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From: Italy, Milano
My Ride: 545i SMG with Limited Slip Differential
Model Year: 2005
Originally Posted by Blackonblackonblack' post='428807' date='May 27 2007, 05:34 PM
O.K., fine, but while we're kissing his bottom, will his top end be affected - or will it be as fast, or faster?
Seriously affected! And consumption too . But great acceleration .
At 145 kmh (90 mph) he will have 3800 rpm instead of 3000 .
#35
Originally Posted by AlexFW' post='428625' date='May 26 2007, 12:35 PM
4.1 would be crazy ... Don't make it!
I would like to pass from 2.93 to 3.15 or 3.23 (-8% or -11%) .
I would like to pass from 2.93 to 3.15 or 3.23 (-8% or -11%) .
If you're considering a supercharger in the future however, I'd definitely look into other gears.
#36
Originally Posted by Blackonblackonblack' post='428767' date='May 27 2007, 03:50 AM
So VT, what does this do to your top end?
You will have better gas mileage than him though
#37
I spoke with my dealer the other day about swapping out ring and pinions, dinan rear diff and other options. I also did some parts research and this is how things are summarized at the moment.
BMW says that they do not swap ring and pinion gears. They swap out the entire diff as a single unit, everything but the cover and the fluid. The gears in a 550i Step are 3.38 compared to manual 2.93. The driveshaft on the Step is 2mm shorter than the manual/SMG, but Tech said they could make it work. The problem is, I was told if anything ever went wrong with the drive train the first thing they will try to do is point at the incorrect diff in the car as the culprit. Even though it is a BMW part installed by BMW techs. He indicated the safe way was the Dinan, but the difference in diff cost is $500 versus BMW diff. I was told no warranty issues with Dinan diff, funny huh, aftermarket trumps OEM.
I too want shorter gears in my manual 550i and it will be the first major mod I undertake. He also told me that the dealership may be having a Dinan day soon where they will discount parts/labor. I think I will wait and see.
I will check into the RD Sports ring and pinion gears to see how feasible the swap is. Vegas, keep us informed of your pioneering progress.
al
BMW says that they do not swap ring and pinion gears. They swap out the entire diff as a single unit, everything but the cover and the fluid. The gears in a 550i Step are 3.38 compared to manual 2.93. The driveshaft on the Step is 2mm shorter than the manual/SMG, but Tech said they could make it work. The problem is, I was told if anything ever went wrong with the drive train the first thing they will try to do is point at the incorrect diff in the car as the culprit. Even though it is a BMW part installed by BMW techs. He indicated the safe way was the Dinan, but the difference in diff cost is $500 versus BMW diff. I was told no warranty issues with Dinan diff, funny huh, aftermarket trumps OEM.
I too want shorter gears in my manual 550i and it will be the first major mod I undertake. He also told me that the dealership may be having a Dinan day soon where they will discount parts/labor. I think I will wait and see.
I will check into the RD Sports ring and pinion gears to see how feasible the swap is. Vegas, keep us informed of your pioneering progress.
al
#38
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Joined: Dec 2006
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My Ride: 2008 Silver 535i Virgin--Becoming a Beast!
Originally Posted by AlB' post='429050' date='May 28 2007, 08:09 AM
I spoke with my dealer the other day about swapping out ring and pinions, dinan rear diff and other options. I also did some parts research and this is how things are summarized at the moment.
BMW says that they do not swap ring and pinion gears. They swap out the entire diff as a single unit, everything but the cover and the fluid. The gears in a 550i Step are 3.38 compared to manual 2.93. The driveshaft on the Step is 2mm shorter than the manual/SMG, but Tech said they could make it work. The problem is, I was told if anything ever went wrong with the drive train the first thing they will try to do is point at the incorrect diff in the car as the culprit. Even though it is a BMW part installed by BMW techs. He indicated the safe way was the Dinan, but the difference in diff cost is $500 versus BMW diff. I was told no warranty issues with Dinan diff, funny huh, aftermarket trumps OEM.
I too want shorter gears in my manual 550i and it will be the first major mod I undertake. He also told me that the dealership may be having a Dinan day soon where they will discount parts/labor. I think I will wait and see.
I will check into the RD Sports ring and pinion gears to see how feasible the swap is. Vegas, keep us informed of your pioneering progress.
al
BMW says that they do not swap ring and pinion gears. They swap out the entire diff as a single unit, everything but the cover and the fluid. The gears in a 550i Step are 3.38 compared to manual 2.93. The driveshaft on the Step is 2mm shorter than the manual/SMG, but Tech said they could make it work. The problem is, I was told if anything ever went wrong with the drive train the first thing they will try to do is point at the incorrect diff in the car as the culprit. Even though it is a BMW part installed by BMW techs. He indicated the safe way was the Dinan, but the difference in diff cost is $500 versus BMW diff. I was told no warranty issues with Dinan diff, funny huh, aftermarket trumps OEM.
I too want shorter gears in my manual 550i and it will be the first major mod I undertake. He also told me that the dealership may be having a Dinan day soon where they will discount parts/labor. I think I will wait and see.
I will check into the RD Sports ring and pinion gears to see how feasible the swap is. Vegas, keep us informed of your pioneering progress.
al
I would appreciate if somebody could help me here. Maybe a brief synopsis of what is available *potentially* for me.
I have a Brand New 08 550i Steptronic with Sport Package(loaded--minus active steering).
Is there any benefit for me to change the differential when my car is already a steptronic?
Knowing this car is really quick and possibly quicker than the 360hp claimed------what kind of gains would I realize---HP and Low End Torque?
I appreciate the info.
SoCal
#39
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From: Italy, Milano
My Ride: 545i SMG with Limited Slip Differential
Model Year: 2005
Originally Posted by SoCalM5Mang' post='429058' date='May 28 2007, 05:29 PM
Hi Everybody! I'm jumping in late on this thread. Great stuff. Some of you guys are true gearheads. ;-)
I would appreciate if somebody could help me here. Maybe a brief synopsis of what is available *potentially* for me.
I have a Brand New 08 550i Steptronic with Sport Package(loaded--minus active steering).
Is there any benefit for me to change the differential when my car is already a steptronic?
Knowing this car is really quick and possibly quicker than the 360hp claimed------what kind of gains would I realize---HP and Low End Torque?
I appreciate the info.
SoCal
I would appreciate if somebody could help me here. Maybe a brief synopsis of what is available *potentially* for me.
I have a Brand New 08 550i Steptronic with Sport Package(loaded--minus active steering).
Is there any benefit for me to change the differential when my car is already a steptronic?
Knowing this car is really quick and possibly quicker than the 360hp claimed------what kind of gains would I realize---HP and Low End Torque?
I appreciate the info.
SoCal
To gain 30 HP you have to replace the stock exhaust with a custom exhaust like mine .
Search for my exhaust thread with pics .
After catalysts with 100 cells .
And finally map .
I think at least 50 HP with his 3 mods .