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      02-17-2013, 08:29 AM   #1
MTrezzz
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Best E92 Tune???

Looking for a tune so my M3 Lime Rock, can beat my old C63 Coupe in a straight line.
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      02-17-2013, 09:20 AM   #2
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The mods should merge all the "tune" threads and make it a sticky. I would recommend searching for this as there is much debate over this topic. I don't think there is a clear "winner".
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      02-17-2013, 09:26 AM   #3
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IMO ESS but I would also recommend cat delete, pulley, intake and then the tune. Like others will tell you search because there are numerous threads on this topic. Good luck.
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      02-17-2013, 10:24 AM   #4
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Quote:
Originally Posted by LIMESANG View Post
Looking for a tune so my M3 Lime Rock, can beat my old C63 Coupe in a straight line.
As far as I know, all the coupes have the wet clutch instead of the torque converter, and they are faster than the original sedans.

Therefore, you'll need more than a tune to keep up. Quarter mile trap speeds suggest the coupe is on the order of 5-6 mph faster than the M3, which suggests that, out on the road, the Merc will simply walk away.

You're going to need something close to an extra 50 HP. Intake, exhaust and tune ought to do it, or at least keep it close.

Bruce
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      02-17-2013, 11:00 AM   #5
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Would weight reduction help at all?

Carbon fiber hood and trunk and some Superforgiatas with non-RFTs?
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      02-17-2013, 11:07 AM   #6
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      02-17-2013, 11:08 AM   #7
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Quote:
Originally Posted by Fieldsy View Post
Would weight reduction help at all?

Carbon fiber hood and trunk and some Superforgiatas with non-RFTs?
It will help but not by a big margin!!!
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      02-17-2013, 11:13 AM   #8
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Quote:
Originally Posted by Team Plutonium View Post
The M3 doesn't have RFT's to begin with. And no, weight reduction (and tune) alone won't help against a C63 in a straight line.
Quote:
Originally Posted by manari06 View Post
It will help but not by a big margin!!!
Thanks guys was just thinking out loud. Good to know about the RFTs - I just assumed all BMWs had them now... Superforgiatas are sick wheels regardless
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      02-17-2013, 11:31 AM   #9
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Quote:
Originally Posted by Fieldsy View Post
Would weight reduction help at all?

Carbon fiber hood and trunk and some Superforgiatas with non-RFTs?
OK, here are the anal particulars:

Acceleration varies as per the cube root of the power to weight delta, which when translated means you need quite a bit more power (or reduced weight) to go a little faster and quicker.

OK, just as an examnple, lets assume a good M3 can hit a trap speed of 114 mph in a quarter mile, while a good C63 can hit 119.

119/114 = 1.0439, times 1.0439, times 1.0439 = 1.1374.

That means you'll need some combination of 13.7% increased power and/or reduced weight in order to hit 119 mph in a quarter mile, which in turn means you'll run roughly neck and neck with the Merc out on the road.

Bruce
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      02-17-2013, 12:29 PM   #10
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Quote:
Originally Posted by bruce.augenstein@comcast. View Post
OK, here are the anal particulars:

Acceleration varies as per the cube root of the power to weight delta, which when translated means you need quite a bit more power (or reduced weight) to go a little faster and quicker.

OK, just as an examnple, lets assume a good M3 can hit a trap speed of 114 mph in a quarter mile, while a good C63 can hit 119.

119/114 = 1.0439, times 1.0439, times 1.0439 = 1.1374.

That means you'll need some combination of 13.7% increased power and/or reduced weight in order to hit 119 mph in a quarter mile, which in turn means you'll run roughly neck and neck with the Merc out on the road.

Bruce
So if just going by weight reduction you'd need 400 pounds shaved. $6000 wheels definitely wont do that haha. Your earlier estimate of 50hp now seems spot on.
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      02-17-2013, 12:33 PM   #11
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Quote:
Originally Posted by LIMESANG View Post
Looking for a tune so my M3 Lime Rock, can beat my old C63 Coupe in a straight line.
Hmm, c63 has over 400 tq to the wheels above 3000 rpm. I don't think I ten will help you out very much
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      02-17-2013, 12:36 PM   #12
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      02-17-2013, 12:44 PM   #13
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Quote:
Originally Posted by rjd598 View Post
+1

I'll say it. Just get a supercharger. Or a GT500
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      02-17-2013, 12:47 PM   #14
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BPM sport has had great reviews on this forum, I purchased a tune. I just haven't installed it yet.
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      02-17-2013, 12:47 PM   #15
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Can we get a discussion going on which exhaust sounds the best after we are done here?
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      02-17-2013, 01:05 PM   #16
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Quote:
Originally Posted by Fieldsy View Post
Would weight reduction help at all?

Carbon fiber hood and trunk and some Superforgiatas with non-RFTs?
There are some forum sponsors that'll be happy to sell you a CF hood pretending it's much lighter than the OEM aluminum one. They charge plenty for it, and if you look at the fitment, it sucks. Even with the best installers it doesn't fit like OEM.
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