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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 05-12-2014, 07:14 PM   #1
Swoodford58
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Differential help

Hi I am a new bmw owner as well as new member to the forum, I own a 03 325i 5 speed, and am in need of advice, I'd like to add an LSD but I'm not sure of which kind to use, an m3 dif? Please help and thanks!
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Old 05-12-2014, 07:19 PM   #2
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M3 diff is the cheapest if you do all the work yourself, you need the rear subframe, diff, control arms, special driveshaft ( bc you have a sedan). But the ratio is way off for a 5 speed. Buying a 6 speed transmission to pair with it would put your swap around $2,200.00. Of you can contact the guy on here who retrofits bmw LSD's into the e46 housing for a direct plug and play set up (that will cost you around $1000) or go aftermarket and spend 1200-2000 but is not plug and play and you will need someone to install in your diff housing. Also use the search function. Someone once a week asked this on here.
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Old 05-12-2014, 07:30 PM   #3
Rob43
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Originally Posted by Swoodford58 View Post
Hi I am a new bmw owner as well as new member to the forum, I own a 03 325i 5 speed, and am in need of advice, I'd like to add an LSD but I'm not sure of which kind to use, an m3 dif? Please help and thanks!

Realistically, plan on spending about $1800 to $2000 installed for a LSD.


Go to the Driveline sub forum and start searching, lots of great info there.



Good luck.
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Old 05-12-2014, 07:44 PM   #4
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You need a limited slip differential on an underpowered family car why? It's not as though you are going to boil the hides off the car.


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Old 05-12-2014, 08:06 PM   #5
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It can help to get traction on slippery road surface, but not worth it for $2000.
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Old 05-12-2014, 08:11 PM   #6
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You need a limited slip differential on an underpowered family car why? It's not as though you are going to boil the hides off the car.


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+1.

OP we are all here for different reasons and we all have different opinions but as one of the older more experienced BMW owners let me try to talk some sense into you.

Being a new owner I'm sure you are excited and I'm sure you have a million different ideas running thru your head as to things you want to do to the car. This is only natural. However let me explain that first and foremost if you just bought the car there are several better ways to spend that $2000. These cars require quite a lot of maintenance to stay running tip top and to ensure that you have a reliable car. There are countless people like yourself on here that jump the gun and spend a bunch of cash modding their newly acquired BMW only to end up having nothing but problems with repairs and breakdowns. Some are serious enough to take out the entire motor.

My suggestion would be to hold off and do some research about the car you just bought. Get to know the items that require attention and make yourself a checklist. You will feel so much better about your car knowing that you are doing the responsible thing and making sure that it's running and performing as it should. Don't start chopping the car up to add unnecessary items to it. Not to mention the car you bought isn't even fast enough to have very much fun with a LSD.

If you want a sports car then set yourself a goal and save your money. You bought a luxury car with some performance characteristics but it's far from a sports car. Don't be like most other irresponsible kids on this site and start modding a car that runs and drives half assed. Just because you bought a car with a BMW logo on the hood doesn't mean it's the "ultimate driving machine" just yet. Spend the money refreshing what came on the car and get it back to its glory. You will be glad you did in the end. Good luck.


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Old 05-12-2014, 08:34 PM   #7
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+1.

OP we are all here for different reasons and we all have different opinions but as one of the older more experienced BMW owners let me try to talk some sense into you.

Being a new owner I'm sure you are excited and I'm sure you have a million different ideas running thru your head as to things you want to do to the car. This is only natural. However let me explain that first and foremost if you just bought the car there are several better ways to spend that $2000. These cars require quite a lot of maintenance to stay running tip top and to ensure that you have a reliable car. There are countless people like yourself on here that jump the gun and spend a bunch of cash modding their newly acquired BMW only to end up having nothing but problems with repairs and breakdowns. Some are serious enough to take out the entire motor.

My suggestion would be to hold off and do some research about the car you just bought. Get to know the items that require attention and make yourself a checklist. You will feel so much better about your car knowing that you are doing the responsible thing and making sure that it's running and performing as it should. Don't start chopping the car up to add unnecessary items to it. Not to mention the car you bought isn't even fast enough to have very much fun with a LSD.

If you want a sports car then set yourself a goal and save your money. You bought a luxury car with some performance characteristics but it's far from a sports car. Don't be like most other irresponsible kids on this site and start modding a car that runs and drives half assed. Just because you bought a car with a BMW logo on the hood doesn't mean it's the "ultimate driving machine" just yet. Spend the money refreshing what came on the car and get it back to its glory. You will be glad you did in the end. Good luck.


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Old 05-13-2014, 03:37 PM   #8
Swoodford58
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Originally Posted by mjpgolf1 View Post
+1.

OP we are all here for different reasons and we all have different opinions but as one of the older more experienced BMW owners let me try to talk some sense into you.

Being a new owner I'm sure you are excited and I'm sure you have a million different ideas running thru your head as to things you want to do to the car. This is only natural. However let me explain that first and foremost if you just bought the car there are several better ways to spend that $2000. These cars require quite a lot of maintenance to stay running tip top and to ensure that you have a reliable car. There are countless people like yourself on here that jump the gun and spend a bunch of cash modding their newly acquired BMW only to end up having nothing but problems with repairs and breakdowns. Some are serious enough to take out the entire motor.

My suggestion would be to hold off and do some research about the car you just bought. Get to know the items that require attention and make yourself a checklist. You will feel so much better about your car knowing that you are doing the responsible thing and making sure that it's running and performing as it should. Don't start chopping the car up to add unnecessary items to it. Not to mention the car you bought isn't even fast enough to have very much fun with a LSD.

If you want a sports car then set yourself a goal and save your money. You bought a luxury car with some performance characteristics but it's far from a sports car. Don't be like most other irresponsible kids on this site and start modding a car that runs and drives half assed. Just because you bought a car with a BMW logo on the hood doesn't mean it's the "ultimate driving machine" just yet. Spend the money refreshing what came on the car and get it back to its glory. You will be glad you did in the end. Good luck.


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Honestly that is some great insight , that has actually changed my mind since what you said made perfect sense, thanks for yr advice!
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Old 05-13-2014, 04:24 PM   #9
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Originally Posted by Stickbuilder View Post
You need a limited slip differential on an underpowered family car why?
probably the same reason BMW put these in the E30 325is
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