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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > MPG with Quaife??



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      11-03-2008, 09:53 PM   #1
cvc 22349a
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MPG with Quaife??

I'm planning on installing a Quaife LSD in my '07 335i 6AT.
I'm wondering if any of you with the Quaife have experienced reduced MPG (normal/highway driving) since installing this LSD??
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      11-04-2008, 11:02 AM   #2
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No difference. I got 30 mpg @ an average speed of 69 mph on a 314 mile trip with mine. Don't think it changes a thing.
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      11-04-2008, 11:21 AM   #3
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Isn't it the same ratio as stock?
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      11-04-2008, 11:42 AM   #4
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Same as stock in mine.
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      11-04-2008, 11:49 AM   #5
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mine dropped to half. i guess its because both wheels are spinning
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      11-04-2008, 12:22 PM   #6
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No changes
I dont see why it would change if you keep the same ratio
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      11-04-2008, 04:06 PM   #7
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Quote:
Originally Posted by jadeddjay View Post
mine dropped to half. i guess its because both wheels are spinning
+ 1 I saw a decrease in MPG, also turning off all the nanny's and drifting around corners kind of stuffs up your tires as well
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      11-04-2008, 04:37 PM   #8
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Are you planning to switch out the entire diff? or were u lucky and have a nonweilded diff?
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      11-04-2008, 04:53 PM   #9
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I have a non welded diff....one of these days I'll pull the trigger on a LSD...god I need one.
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      11-04-2008, 06:13 PM   #10
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so lucky... if i had a bolted diff i wouldnt hesitate right now...
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      11-05-2008, 11:19 AM   #11
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At the risk of sounding like an idiot: with AWD there is greater drivetrain loss and lower MPG than RWD/FWD. It sort of strands to reason, doesn't it, that the LSD would have small effect on MPG? I think of an open diff as being 1WD and LSD as being 2WD -- is that an incorrect assessment?
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      11-05-2008, 11:53 AM   #12
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There is a very small increment in additional friction, both from moving the internal gears and the slight increase in lubricant temperature. There is no appreciable change otherwise, no 1wd to 2wd effect, as an open dif is driving both wheels under most conditions.

I am more concerned with noise, although most quaife owners report things are pretty quiet. I still need to get mine installed, and get some audio via stethoscope.
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      11-05-2008, 12:04 PM   #13
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Quote:
Originally Posted by jadeddjay View Post
mine dropped to half. i guess its because both wheels are spinning
Are you kidding??
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      11-05-2008, 12:13 PM   #14
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Originally Posted by cvc 22349a View Post
Are you kidding??
I don't think so, my dad suffers from the same sickness. The only time a open diff car becomes "1wd" is when one of the tires breaks traction, and the stupid open diff sends 100% power to the one with least traction.
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      11-05-2008, 03:29 PM   #15
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Quote:
Originally Posted by stressdoc View Post

I am more concerned with noise, although most quaife owners report things are pretty quiet. I still need to get mine installed, and get some audio via stethoscope.
FYI I have had no noticeable noise increase in the cabin.
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      11-05-2008, 04:22 PM   #16
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Quote:
Originally Posted by AndreyATC View Post
No changes
I dont see why it would change if you keep the same ratio
I'm not an Engineer or Mechanic, but I thought additional friction or drivetrain loss, so to speak, might increase fuel comsumption. That's why I was curious if people have noticed an increase in fuel consumption.
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      11-05-2008, 05:13 PM   #17
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Quote:
Originally Posted by cvc 22349a View Post
I'm not an Engineer or Mechanic, but I thought additional friction or drivetrain loss, so to speak, might increase fuel comsumption. That's why I was curious if people have noticed an increase in fuel consumption.
True, but i dont think there is any friction increase
At least it's very minimal
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      11-22-2008, 03:03 PM   #18
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Quote:
Originally Posted by stressdoc View Post
There is a very small increment in additional friction, both from moving the internal gears and the slight increase in lubricant temperature. There is no appreciable change otherwise, no 1wd to 2wd effect, as an open dif is driving both wheels under most conditions.

I am more concerned with noise, although most quaife owners report things are pretty quiet. I still need to get mine installed, and get some audio via stethoscope.
Well, I got my Quaife installed last week; what a blast exiting sharp turns! Hope it helps driving in snow/slippery surfaces.
About your/my noise concern: I've only heard gear whine once, and that was when I drove back to Tahoe from the Bay Area on a warm day. After having driven approx. 75-100 miles, I noticed a gear whine sound coming from the car upon acceleration. When I let go of the gas, the sound when away; when I accelerated I got the gear whine (not a major acceleration btw). I haven't heard the gear whine since during my short trips up to 20 miles. It's also pretty cold up here now. I can only assume the gear whine I heard was related to heat.
Anyone else experience this with their Quafe LSD?
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      11-22-2008, 03:20 PM   #19
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Quote:
Originally Posted by cvc 22349a View Post
Well, I got my Quaife installed last week; what a blast exiting sharp turns! Hope it helps driving in snow/slippery surfaces.
About your/my noise concern: I've only heard gear whine once, and that was when I drove back to Tahoe from the Bay Area on a warm day. After having driven approx. 75-100 miles, I noticed a gear whine sound coming from the car upon acceleration. When I let go of the gas, the sound when away; when I accelerated I got the gear whine (not a major acceleration btw). I haven't heard the gear whine since during my short trips up to 20 miles. It's also pretty cold up here now. I can only assume the gear whine I heard was related to heat.
Anyone else experience this with their Quafe LSD?
Any noises i heard initially went away after a while. You will see the best gains on slippery surfaces. Just make sure you change the oil in the diff after a few months after it's broken in and use the proper oil (I use BMW 335i diff oil).
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      11-22-2008, 04:56 PM   #20
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Will do on the fluid change; also recommended by Harold at HP, only Redline 75/90
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      11-22-2008, 07:31 PM   #21
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Quote:
Originally Posted by stressdoc View Post
There is a very small increment in additional friction, both from moving the internal gears and the slight increase in lubricant temperature. There is no appreciable change otherwise, no 1wd to 2wd effect, as an open dif is driving both wheels under most conditions.

I am more concerned with noise, although most quaife owners report things are pretty quiet. I still need to get mine installed, and get some audio via stethoscope.
I was one of the guys concerned with what I perceived as a very, very light harmonic growl when I was accelerating with my new Quaife. It has diminished greatly, I don't really think it's there anymore. The geometry of the car may have had something to do with it, as I lowered my car on KW2's at the same time and slammed it pretty hard. Since then I raised the car
3/4" and the Quaife seems to have broken in. I have to say LSD and a piggyback are the shits for upgrades on our cars, both give you a whole new ride, with KW's in 3rd. You will enjoy yours I'm sure.
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      11-23-2008, 12:20 PM   #22
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Quote:
Originally Posted by bmwmike View Post
Any noises i heard initially went away after a while. You will see the best gains on slippery surfaces. Just make sure you change the oil in the diff after a few months after it's broken in and use the proper oil (I use BMW 335i diff oil).

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