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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 02-03-2009, 01:35 AM   #1
SpeedDemon
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Cool How much do these items improve 0-60 acceleration times?

I'm wondering how much these two mods make the car faster in 0-60...

If the ZHP could originally do 0-60 in 5.6 seconds then how much faster do the following items make the car do a 0-60 sprint?

1. LSD
2. 3.46 FD from a 3.07
3. Stickier tires

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Old 02-03-2009, 11:49 AM   #2
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they'd shave a couple points of a second off that 5.6 0-60 time and you can buy a 3.46 lsd ...

regards,
tyler
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Old 02-03-2009, 03:22 PM   #3
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I have a 3.46 LSD with some of the stickiest street tires around

It's just that it's winter time (cold) and there's nowhere that I can accurately measure my 0-60 this time of year so I'm wondering what people's experience is with these mods? I mean would it shave off .2? .1? .3?
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Old 02-03-2009, 03:25 PM   #4
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3.46 diff would actually decrease your 0-60 time, because you cannot achieve 60mph without shifting to the 3rd with the 3.46 diff... It would improve 1/4 mile numbers though.

LSD doesn't have any effect on linear acceleration.

Stickier tires would help a great deal, since at the time of take off, friction is the dominant force to get your car going rather than its horse power or differential.
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Old 02-03-2009, 05:55 PM   #5
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if you got a 3.38 diff that would help your 0-60 b/c you would hit 60 at the top of 2nd gear.
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Old 02-03-2009, 05:59 PM   #6
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Originally Posted by cngzsn View Post
LSD doesn't have any effect on linear acceleration.
accelerating you are correct, however LSD would jump off the line a little quicker due to the face that power is going equally to both wheels, rather than one....
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Old 02-03-2009, 06:54 PM   #7
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accelerating you are correct, however LSD would jump off the line a little quicker due to the face that power is going equally to both wheels, rather than one....
Lsd never distributes the power equally to both wheels. There is a certain amount of "locking" while taking a curve, so that the outer wheel gets "some" of that power, as well as the inner one. While accelerating on a straight line, it doesn't matter if you have an lsd or an open diff.
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Old 02-03-2009, 10:39 PM   #8
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It seems like an LSD would have to help off the line. Of course you are still going to slip a wheel, but wheel slip won't be as detrimental as it would be with a Open Diff. Wheel slip with an LSD will cause the other wheel to get the rest of the torque. It seems like this would be especially true with an LSD like my Torsen (Quaife) that is auto-torque-biasing (ATB) all the time.

Yes, a ZHP does have a 6800RPM redline, but the rev limiter doesn't kick in until just after 7000 RPM. A ZHP or any E46 that has a flashed ECU can hit 7000 RPM in 2nd and bounce off the rev limiter at which point it would be doing 60.25 MPH with a 3.46 final drive. Check out the calculation I did over on my330i.com:


Last edited by SpeedDemon; 02-03-2009 at 11:39 PM.
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Old 02-09-2009, 12:00 AM   #9
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LSD does little for us in this regard since we're aren't getting that much wheelspin. Same with tires, if you aren't getting much wheelspin now, I can't see better tires helping.

Getting a good launch is probably the xfactor.
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Old 02-09-2009, 12:30 AM   #10
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ZHP 5.6 to 60 is a little ambitious. That number is more than a half second quicker than my 330 CI AT and within .5 of my 08 G37S all while giving up nearly 100 hp to the G. These threads are interesting but wildly inaccurate, fun to discuss though. Cheers!
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Old 02-09-2009, 03:07 AM   #11
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0-60 in 5.6 has been achieved by multiple magazines.

Your Steptronic slows the car down by at least a whole second and the only reason that it comes close to the manual time is due to it having the shorter 3.46 gearing vs. the manuals 2.93 or 3.07 in a ZHP.

You G37S is heavy and the horsepower means nothing if it isn't developed at the right points in the power curve.

Last edited by SpeedDemon; 02-09-2009 at 09:14 PM.
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Old 02-09-2009, 09:25 AM   #12
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ZHP 5.6 to 60 is a little ambitious. That number is more than a half second quicker than my 330 CI AT and within .5 of my 08 G37S all while giving up nearly 100 hp to the G. These threads are interesting but wildly inaccurate, fun to discuss though. Cheers!
FYI, 0-60 was done in 5.4 seconds and 1/4 mile in 14 seconds flat by KrisL, on a %100 stock ZHP... When in doubt, use the search button.
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Old 02-09-2009, 09:15 PM   #13
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FYI, 0-60 was done in 5.4 seconds and 1/4 mile in 14 seconds flat by KrisL, on a %100 stock ZHP... When in doubt, use the search button.
Any idea what his launch techniques were?
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Old 02-09-2009, 09:23 PM   #14
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LSD does little for us in this regard since we're aren't getting that much wheelspin. Same with tires, if you aren't getting much wheelspin now, I can't see better tires helping.

Getting a good launch is probably the xfactor.
Just wanted to add that I found it pretty easy to spin the wheels with the original tires.
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Old 02-09-2009, 09:40 PM   #15
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Any idea what his launch techniques were?
Launch at around 2700 rpm and shift as fast as you can. That was it IIRC... No DSC of course.
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Old 02-09-2009, 10:05 PM   #16
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0-60 in 5.6 has been achieved by multiple magazines.
FWIW, the C&D video review of the ZHP coupe indicated their 5.6 sec was an estimated value.

Quote:
Originally Posted by cngzsn View Post
FYI, 0-60 was done in 5.4 seconds and 1/4 mile in 14 seconds flat by KrisL, on a %100 stock ZHP.
Those were GTech Pro numbers, which I believe factors in a 1 ft rollout. You can add roughly 2 - 3 tenths for a standing start. And of course, you can always debate the accuracy of the GTech.
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Old 02-09-2009, 10:36 PM   #17
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^ I am sure those issues were debated in the past without any consensus, but I think 5.6 should be consistently doable
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Old 02-10-2009, 07:37 AM   #18
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^ I am sure those issues were debated in the past without any consensus, but I think 5.6 should be consistently doable
IIRC, KrisL only got below 6 sec on 1 out of 3 attempts. I know we're all pro drivers but 5.6 is a wee bit optimistic for most people. While it's not impossible, it would certainly be easier to achieve consistently in a car with more torque that would make nailing the perfect launch a little less critical.
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