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Discussion Starter · #1 ·
bought some panels today to repair my compact! asked him about a lsd but he said use one from an old e30 but he said there not that good?? he runs a welded diff just for fun track times!!!! whats your advice on it??? Im going to use it as a daily driver and know a welded diff will scrub tyres like hell but il only be running cheap 15"
had loads of mk2 escorts in past with lsd but they work well
never used welded diff tho:confused
 

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Seconded with Ronnie, it will drive awful as a daily. :frown
Here is some info i have found :thumbsup

Weld locking the stock differential is a popular but controversial modification. Welding a differential is typically done to a drift-use car, and is unfavorable to daily-driving conditions. With the proper knowledge daily driving a welded differential can be a livable experience.

The "welded diff" is done by welding the spider gears together in the factory differential. Special care should be taken to make the most durable welds possible, some have welded thick bolts onto the spider gears to make for a stronger weld. Failure could result in an immobilized diff which would cause an unsafe condition for you, and those around you.

Pros:

- Breaks traction consistently, makes drifting much easier than open diff.

- It's cheap, a welder will charge something near 50$ USD to weld. Replacement differentials can be found used for around 40$ USD.

- It's extremely durable when done properly.

- Little to no maintenance.

- In certain situations, and if driven correctly, you will have more grip in cornering.

Cons:

- Requires a different way of taking corners. Must accelerate through a turn, to the limit of adhesion, taking care not to break the tires loose and cause oversteer.

- Tires make noise at very low speeds (typically parking, or U-turns) as the wheels "fight" each other. The wheels are traveling at the same speed, but along different radii, which causes the outside wheel to shake, hop, and break loose at low speeds. This will increase tire wear in normal use, but if you really care about tire wear over performance, you wouldn't be welding a differential. Let it also be known that most 2-way LSD's exhibit this same characteristic, especially the more aggressive ones.

- Car tends to "push" at low speed.

- Not recommended for inexperienced grip driving. Can be very effective and far more consistent than an open differential, but requires advanced driving techniques.

- If the welds break, they can cause differential lock, and lead to a potential accident.
 

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Discussion Starter · #6 ·
sounds fun while it works tho!!! just been scouring fleebay for lsd and repair kits but there not cheap so bit lost at mo what to do!!!!! havent even checked if a slip been put in it?? that be !st on list 2mor!!
otherwise think it be an e30 3.60 ratio lsd+stick some new clutch plates init:D
 

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Interesting stuff this, and an option I hadnt considered.

What would you guys say if I asked the same question, but my car is for trackdays ONLY?

You see, I have looked at LSDs, and its a complicated process. Quaife will sell me one for £800:eek but then I need it fitted......

So, welded diff or not for my track slag? :D
 

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Discussion Starter · #8 ·
slag!! i like the name of your car dude. the fella i had panels off uses a welded diff on his e30 track car which has a 3.2 m3 motor in it and he said its much better than slip for truck fun!! not as fast coz you be going round them mostly sideways!!! nice thought tho:hihi
 

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If welding a Diff the welding should be done outside of the case and the bearings should be replaced.

The part must be preheated and should be TIG welded. A welded diff is inexpensive and low maintenance. Because a welded diff is a no slip unit it can cause understeer or push on slow or medium speed corners. On simple 90 degree corners this is not much of a problem but on low/medium speed sweepers it’s definitely noticeable. For this reason a welded diff is usually not the best choice for autocross. On most road racing courses, a welded diff is not much of a handicap.

Drivers usually say it takes some getting used to but end up liking the positive feel. I should say that welded diffs are strictly amateur stuff. No “professional” race teams use them.
 

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Discussion Starter · #10 ·
i agree with you there ron your not going to find teams or big projects running welded diffs! But i still think it be a brill cheap way of having fun in a cheap bmw!
do you know what slips fit in?? its just i dont want to waste money buying a slip if its not going to be that tight or good and end up with one wheel spinning round tight bends??
iv seen people selling lsd from 318 is coupe but i didn think the had them???
soz im new to bm scene:confused
 

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i agree with you there ron your not going to find teams or big projects running welded diffs! But i still think it be a brill cheap way of having fun in a cheap bmw!
do you know what slips fit in?? its just i dont want to waste money buying a slip if its not going to be that tight or good and end up with one wheel spinning round tight bends??
iv seen people selling lsd from 318 is coupe but i didn think the had them???
soz im new to bm scene:confused
Couldnt agree more-will be watching this thread to see how you go on. :thumbsup
 

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i agree with you there ron your not going to find teams or big projects running welded diffs! But i still think it be a brill cheap way of having fun in a cheap bmw!
I just quickly borrowed that info :hihi, couldn't be bothered to write the info out :rofl

A Compact you can fit a e32, e28 LSD diff in them. I'll find the info later and post up :cool
 

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Discussion Starter · #15 ·
cheers for that ronnie. Looks like im after a E30 slip then?? Drove it today for first time to mot clutch isnt brill and hell of a vibration in car! after failing on emmisions i had a good look at it on mot ramp to find vibrations?? after 20 mins we found both rubber engine mountings tore apart and engine was resting on sump!!! 70 bucks later new mountings blydi joio:thumbsup just need to stop exhaust blowing then hopefully pass mot??? i love it!!! and all for under 500 bucks. Also bought set 7x15 bbs alloys for it as spares woohoo
 

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its the cheaper way but!
my welded diff on my 328i gives me shocking understeer in the wet expecially when coasting around corners at low speeds both wheels try locking up sending the car into a front wheel slide it can be quite scary you just have too stay on the throtle around slow corners:eek
 

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Discussion Starter · #17 ·
looks like i need to find a e30 lsd then!!! can anyone help me with what models have them??? And is it a matter of jacking the rear of car up to see if both rear wheels turn the same direction when spun???:confused
 
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