LSD or Super Sprint full exhaust?

DUI Elite · 01-20-2016, 01:37 PM

Curious what you guys would do:

E90 325i with 3-stage manifold, AA ceramic coated headers, Eurocharged off-road tune, BMW PI.

After just adding the Headers last month, I'm definitely back in love with the car and see it having even more potential with the remaining few power mods there are on N52's. That being said, I'm having trouble deciding whether I should do the 3.91 LSD first or finish what I started on the exhaust.

Option 1:
3.91 final drive diff from an E91 328ix + Mfactory LSD conversion.

Option 2:
Supersprint section 1 + SS connecting pipes + SS section 2 and SS muffler

Curious what you think. This goal of this car is to become a weekend light track car. It will not likely see daily use

mmmnot · 01-20-2016, 02:01 PM

LSD.

hassmaschine · 01-20-2016, 03:28 PM

LSD. exhaust hardly does anything on these cars except make them louder.

Tim07e90 · 01-20-2016, 03:29 PM

LSD. You pretty have a good mix of mods, so I'd say that.

Tom Droze · 01-20-2016, 03:40 PM

MFactory LSD, ask me how I know.

chris82 · 01-20-2016, 03:44 PM

Tough choice. LSD will absolutely do more for you in every way, but a full SS exhaust would be straight up badass

In the end, I'd most likely end up with the LSD. Swapping an LSD into a non-LSD BMW is awesome

DUI Elite · 01-20-2016, 05:50 PM

lol seems pretty unanimous. I don't love that my car basically sounds stock right now though.

But it sounds like the LSD is that much more worth it. Thank you guys.

Tom Droze How are you liking yours?

Tom Droze · 01-20-2016, 07:36 PM

Quote:

Originally Posted by DUI Elite

lol seems pretty unanimous. I don't love that my car basically sounds stock right now though.

But it sounds like the LSD is that much more worth it. Thank you guys.

Tom Droze How are you liking yours?

I like it. You will find the push coming out of a corner to much stronger as compared to stock and the tracking through sweeping corners is more predictable. I would also suggest the MFactory differential bushings and an upgrade to the subframe bushings too, if you have not already done so. Also, MFactory sells a differential rebuild kit, which I recommend if you have more than 50K miles. MFactory is the only source for a rebuild kit. Oh, and don't forget the shim kit too.

justpete · 01-20-2016, 07:48 PM

LSD, no question for the track. If you want some sound find a used PE and leave the secondaries in.

Mavus · 01-20-2016, 08:26 PM

^ what he said

Taskmaster · 01-20-2016, 10:22 PM

Dyno tune, and LSD.

Tom Droze · 01-20-2016, 10:32 PM

Quote:

Originally Posted by TheAxiom

Dyno tune, and LSD.

Hey Axiom, that is so 1960's, drugs will kill you son.

justpete · 01-22-2016, 09:34 PM

Quote:

Originally Posted by Tom Droze

Hey Axiom, that is so 1960's, drugs will kill you son.

Oh! NOT blotter. Damn. Now I'm confused...

Bimmer-Bob · 01-23-2016, 12:12 AM

It all comes down to intended usage. If your goal is really to make the thing a "weekend light track car," then obviously an LSD would be much more advantageous. But, in the short term, if you just want it to sound better (not blaming you, don't we all?) then the better option would be exhaust mods. Ideally, you would do both, but as far as what to do first - well, that depends on your priorities. Do you want to sound good or do you want to put power down more effectively when pushing the car (i.e., more than normal street use)?

hassmaschine · 01-23-2016, 10:06 AM

all show no go..

superduty · 01-23-2016, 06:34 PM

Quote:

Originally Posted by hassmaschine

LSD. exhaust hardly does anything on these cars except make them louder.

I have to respectfully disagree with this statement. It may be true if you are running a PE but after installing a cat back SS system about a month ago it's more than just noise (which this system lacks anyway). Besides a noticeable butt dyno improvement, throttle response is markedly sharper. The most surprising change is the ability to create some wheel spin. Something totally impossible before even when raping the clutch. I'm not saying the car is completely transformed but it should have come from the factory this way. After dumping the 2nd cats, an LSD will probably make more sense.

Just my $0.02

hassmaschine · 01-23-2016, 07:22 PM

I don't put much faith in the calibration of butt dynos..

Kgolf31 · 01-23-2016, 10:09 PM

Quote:

Originally Posted by Tom Droze

Quote:

Originally Posted by DUI Elite

lol seems pretty unanimous. I don't love that my car basically sounds stock right now though.

But it sounds like the LSD is that much more worth it. Thank you guys.

Tom Droze How are you liking yours?

I like it. You will find the push coming out of a corner to much stronger as compared to stock and the tracking through sweeping corners is more predictable. I would also suggest the MFactory differential bushings and an upgrade to the subframe bushings too, if you have not already done so. Also, MFactory sells a differential rebuild kit, which I recommend if you have more than 50K miles. MFactory is the only source for a rebuild kit. Oh, and don't forget the shim kit too.

Push can be developed by a diff that isn't setup correctly with too much preload or ramp angles.

Of course YMMV but from my observations with another 128 with a M Factory they had awful push where mine is virtually none

superduty · 01-24-2016, 07:57 AM

Quote:

Originally Posted by hassmaschine

I don't put much faith in the calibration of butt dynos..

Neither do I. It's just an observation.

justpete · 01-24-2016, 09:05 AM

Quote:

Originally Posted by superduty

Neither do I. It's just an observation.

The placebo effect, being the placebo effect, isn't noticeable but it is externally observable. To feel an increase in horsepower it's generally agreed the increase needs to be on the order of ten percent and no catback on earth will produce ~20rwhp.

Taskmaster · 01-24-2016, 09:25 AM

What's missing from this is OPs goals. What do you want from your car?

mlifxs · 01-24-2016, 02:42 PM

I think LSD would be the best mod for autocross, other than learning how to drive

View Poll Results: LSD or SS full exhaust? NA section only!
3.91 LSD	24	88.89%
SS FULL exhaust	3	11.11%
Voters: 27. You may not vote on this poll

01-20-2016, 01:37 PM	#1
DUI Elite ///M at Heart 90 Rep 1,954 Posts Drives: 06 SGM E90, 15 BSM E84 Join Date: Jan 2011 Location: Chicago, IL iTrader: (4)	LSD or Super Sprint full exhaust? Curious what you guys would do: E90 325i with 3-stage manifold, AA ceramic coated headers, Eurocharged off-road tune, BMW PI. After just adding the Headers last month, I'm definitely back in love with the car and see it having even more potential with the remaining few power mods there are on N52's. That being said, I'm having trouble deciding whether I should do the 3.91 LSD first or finish what I started on the exhaust. Option 1: 3.91 final drive diff from an E91 328ix + Mfactory LSD conversion. Option 2: Supersprint section 1 + SS connecting pipes + SS section 2 and SS muffler Curious what you think. This goal of this car is to become a weekend light track car. It will not likely see daily use __________________ \| 3-IM \| AA Headers \| Eurocharged Stage-3 \| BMW PI \|
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01-20-2016, 02:01 PM	#2
mmmnot Custom User Title 412 Rep 1,337 Posts Drives: E92 328i Join Date: Mar 2015 Location: Hotlanta iTrader: (2)	LSD. __________________ My "build" thread
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01-20-2016, 03:28 PM	#3
hassmaschine Major General 3973 Rep 7,215 Posts Drives: "NBO" 330i Join Date: Jun 2014 Location: earth iTrader: (0)	LSD. exhaust hardly does anything on these cars except make them louder.
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01-20-2016, 03:29 PM	#4
Tim07e90 Captain 130 Rep 775 Posts Drives: 2007 E90 328i Join Date: Mar 2012 Location: SoCal iTrader: (4) Garage List 2007 BMW 328i [8.50]	LSD. You pretty have a good mix of mods, so I'd say that. __________________ Performance Mods: ST Coilovers \| R1 Concepts Premier Rotors w/Hawk HPS Pads \| ECS Stainless Steel Brake Lines \| OEM 219M Wheels \| Bridgestone Potenza RE760 \| Precision Euro Spacers \| AA Race Headers \| AFE Race Midpipes \| Remus Powersound Quad Exhaust \| AA Offroad Tune \| RevMotoring Intake Pipe \| Cyba Scoops
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01-20-2016, 03:40 PM	#5
Tom Droze Major 413 Rep 1,286 Posts Drives: 2012 BMW 328i (e92) Join Date: Jul 2014 Location: Scottsdale, Arizona iTrader: (0)	MFactory LSD, ask me how I know. __________________ 2012 Jet Black 328i Coupe / ESS Tuning Gen. 2 Supercharger / Evolution Racewerks Oil Cooler / BMS Oil Catch Can / BMW Performance Exhaust with Dinan Y Pipe / Eibach Pro Kit Springs / Koni FSD Shocks / MFactory LSD & Differential Bushings / Performance Rear Trailing Arms / BMW Performance Strut Brace / Stop Tech Slotted Rotors / Hawk HPS 5.0 / SS Brake Lines / Brass Guide Pins / M3 Front Control Arms, 28 MM FSB, Engine Cowl, and DCT Paddle Shifters / Michelin PSS / APEX ARC-8
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01-20-2016, 03:44 PM	#6
chris82 Brigadier General 827 Rep 3,856 Posts Drives: 128i Join Date: Aug 2012 Location: NY NY iTrader: (8) Garage List 2009 BMW 128i [9.80]	Tough choice. LSD will absolutely do more for you in every way, but a full SS exhaust would be straight up badass In the end, I'd most likely end up with the LSD. Swapping an LSD into a non-LSD BMW is awesome
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01-20-2016, 05:50 PM	#7
DUI Elite ///M at Heart 90 Rep 1,954 Posts Drives: 06 SGM E90, 15 BSM E84 Join Date: Jan 2011 Location: Chicago, IL iTrader: (4)	lol seems pretty unanimous. I don't love that my car basically sounds stock right now though. But it sounds like the LSD is that much more worth it. Thank you guys. Tom Droze How are you liking yours? __________________ \| 3-IM \| AA Headers \| Eurocharged Stage-3 \| BMW PI \|
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01-20-2016, 07:48 PM	#9
justpete Brigadier General 1233 Rep 3,778 Posts Drives: '11 328i '19 M6 Join Date: Jan 2012 Location: DFW iTrader: (0) Garage List 2019 BMW M6 [10.00] 2011 BMW 328i [9.00]	LSD, no question for the track. If you want some sound find a used PE and leave the secondaries in. __________________ 2011 E90 328i 6MT, BMW Aero, CF hood/boot, PI+CAI+RM+3IM+BPC, SS+CI528+ThermoTec+SS#1+2XBurns, AKG 75D eng/trans, Al/Delrin diff/RS, CM 850, UCP, CAE, AKG DSSR, DiffsOnline 3.91 30/90 LSD+BW cooler, C&R, Setrab, Accusump, AST 3-way+Swift, Aurora PR+BW spherical, Vorshlag CPs, M3 brace+UR bar, ARC-8 18x8.5, 255 R1R, RB/CSL rotors+cooling, 135i calipers, RS29, RT700, Safecraft, OMP HTE-R+804F+QD Superquadro, 6pt cage+FIA, Braille, RT DL1Mk3
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01-20-2016, 08:26 PM	#10
Mavus Colonel 2033 Rep 2,672 Posts Drives: E90 335i, F80 zcp Join Date: Sep 2011 Location: PA iTrader: (9)	^ what he said
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01-20-2016, 10:22 PM	#11
Taskmaster Banned 2465 Rep 9,004 Posts Drives: M235i 6MT / E92 328 Msport 6MT Join Date: Nov 2013 Location: Florida iTrader: (6)	Dyno tune, and LSD.
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01-23-2016, 12:12 AM	#14
Bimmer-Bob ! 699 Rep 3,267 Posts Drives: 2010 128i Join Date: Feb 2010 Location: Anacortes, WA iTrader: (4) Garage List 2024 Ford Bronco (U ... [0.00] 2010 BMW 128i (E82) [9.25]	It all comes down to intended usage. If your goal is really to make the thing a "weekend light track car," then obviously an LSD would be much more advantageous. But, in the short term, if you just want it to sound better (not blaming you, don't we all?) then the better option would be exhaust mods. Ideally, you would do both, but as far as what to do first - well, that depends on your priorities. Do you want to sound good or do you want to put power down more effectively when pushing the car (i.e., more than normal street use)?
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01-23-2016, 10:06 AM	#15
hassmaschine Major General 3973 Rep 7,215 Posts Drives: "NBO" 330i Join Date: Jun 2014 Location: earth iTrader: (0)	all show no go..
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01-23-2016, 07:22 PM	#17
hassmaschine Major General 3973 Rep 7,215 Posts Drives: "NBO" 330i Join Date: Jun 2014 Location: earth iTrader: (0)	I don't put much faith in the calibration of butt dynos..
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01-24-2016, 09:25 AM	#21
Taskmaster Banned 2465 Rep 9,004 Posts Drives: M235i 6MT / E92 328 Msport 6MT Join Date: Nov 2013 Location: Florida iTrader: (6)	What's missing from this is OPs goals. What do you want from your car?
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01-24-2016, 02:42 PM	#22
mlifxs Diamond Geezer 212 Rep 2,385 Posts Drives: Jet Black 2007 328i Saloon Join Date: Nov 2007 Location: Florida iTrader: (6) Garage List 2016 VW Golf Sportw ... [10.00]	I think LSD would be the best mod for autocross, other than learning how to drive
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