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View Full Version : 4.1 lsd slowed 325e down


objec
02-16-2004, 03:52 PM
just put a 4. lsd in a 325e and a major speed difference, slowed me down alot, 5th at 4000rpm id say maye only like 80 or 90 mph

can i take the guts from the 4.1 and turn the stock differential from the 325e into a lsd?

or is there another way to get my rpms back, maybe a e30 m3 tranny, will that work?

Digitalwave
02-16-2004, 03:55 PM
A 4.10 is WAY too short for a mostly stock 325e. A 3.46 is about the max that you want. Sell that diff and get something else...

objec
02-16-2004, 03:56 PM
can i swap the insides and just make the old one lsd?

Digitalwave
02-16-2004, 04:13 PM
Nah...

punnzzells
02-17-2004, 04:51 AM
even a 3.73 is pushing it... but a 3.46 would be NICE! I would love to grab one for my E...

Mike.

Eurostyle
02-17-2004, 07:55 AM
Originally posted by punnzzells
even a 3.73 is pushing it... but a 3.46 would be NICE! I would love to grab one for my E...

Mike.

Nah...I was VERY happy with my 3.91...very nice way to enjoy those 200lb of torque!!! Never needed to downshift, you just punch it, and it goes!

Mystikal
02-17-2004, 02:09 PM
Originally posted by Eurostyle
Nah...I was VERY happy with my 3.91...very nice way to enjoy those 200lb of torque!!! Never needed to downshift, you just punch it, and it goes!

It may have felt faster, but you really lost a lot of the powerband.

Digitalwave
02-17-2004, 03:53 PM
etas only have 170ft/lbs.

Skunk#1
02-17-2004, 04:00 PM
objec has 250 hp from his. still want to see proof, go get some dyno slips.

Eurostyle
02-17-2004, 05:05 PM
Originally posted by Digitalwave
etas only have 170ft/lbs.

Did i say it was stock!:)

Eurostyle
02-17-2004, 05:09 PM
Originally posted by Mystikal
It may have felt faster, but you really lost a lot of the powerband.

When the speedo is showing 190+Km/h, and we consider its not 100% accurate, so lets say it was 180...thats still VERY good for a car with over 400000 original Km, and a 3:91 repalcing the stock 2:73....

chromius
02-17-2004, 06:46 PM
Originally posted by Skunk#1
objec has 250 hp from his. still want to see proof, go get some dyno slips.

LOL, you beat me to it! :D

lvan
02-17-2004, 07:44 PM
Hey Euro your E30 has 400 000? aaiiiiiii So I am perfect with 200 000 somthing hah yeah but that is only with 325E NOT I head?

400k wiht your white car or otherone

BimmerKris
02-18-2004, 02:07 AM
I'm pretty sure i got a stock diff in the back but mine has posi already. Creating an LSD is just a matter of welding the the trow out gears together. But then it's constant. is a new diff a huge gain, i'm pretty impressed with the stock one. I have done alot of work to the motor and it plays the powerband nicely.

BMW_M52_M20
02-18-2004, 12:26 PM
Originally posted by Digitalwave
etas only have 170ft/lbs.

A chip will bring an ETA up to 200lb/t, those engines are highly underated.
Jay

tlaselva
02-18-2004, 12:42 PM
With a shorter gear like a 4.10, you’re trading road speed (HP) for pulling power (torque).
Car's with high HP ratings, like M3's and Vettes, usually can gain some acceleration buy going to a lower gear, but at the sacrifice of top end, if it's not already limited buy aerodynamics. It's because they already have alot of HP, and loosing some isn't a big deal.

IMO, a 4.10 gear is way to low for a ~200 HP car though.
You’re having to shifting sooner while you’re accelerating, too soon.
Lots of torque, but lost too much HP.
If anyone's driven a diesel, you'll know how it feels like.

Digitalwave
02-18-2004, 07:22 PM
Originally posted by BMW_M52_M20
A chip will bring an ETA up to 200lb/t, those engines are highly underated.
Jay

Heh, sure, whatever you say...

chromius
02-18-2004, 07:28 PM
Originally posted by Digitalwave
Heh, sure, whatever you say...

he's actually pretty close about that...the average increase in tourque for a chiped 325e is 20ft/lbs so 174+20 =194 pretty close to 200*th-up*

Digitalwave
02-18-2004, 07:37 PM
Do you have dyno charts showing that the 20ft/lb increase is at the peak though?

chromius
02-18-2004, 07:47 PM
I think Dinan has some on their site, but either way, stock the peak torque is made between 2000-3500 RPM on an "eta" engine anyway. even then the torque curve is relativly flat across the entire RPM range, thats one of the beauties with the eta engines.*th-up*

Eurostyle
02-19-2004, 02:10 AM
Originally posted by Digitalwave
Do you have dyno charts showing that the 20ft/lb increase is at the peak though?

Yes, i'm looking at the graph right now! Peaks at 3500RPM, with the chip it just over 190ft/lb and with exhaust it goes very close to the 200 mark...

BimmerKris
02-19-2004, 02:51 AM
nice

torque is the greatest invention ever

objec
02-23-2004, 02:52 AM
about the welding up of the gears on the open differential, how well does that work has anyone tryed it, what gears exactly do i have to weld up, i have though about this befor but was not sure if it would work well.

BMW BMXer
02-23-2004, 02:57 AM
Weld the spider gears.

Only drive straight.

BMW_M52_M20
02-23-2004, 03:14 AM
Originally posted by Digitalwave
Heh, sure, whatever you say...

:confused:, lets see, uh go look at the Jim comforti chip, the dinan chip, they all show dyno proven results......and all of these are acclaimed companies with excellent products.

The eta's make a big difference with a chip, just look at how underated the engine is with a 2.7L (bigger then your engine) and the stroke is longer, so only producing 121bhp stock and 170lb-t stock out of a 2.7L, 6cyl, there is obvious potential, which is why the chips make a difference remapping the computer and adjusting fuel/air curves and mixtures. The chip does more for my model then yours, if it was 10bhp and 10lb-t I wouldn't even bother with a chip.

I don't need to convince you, go to dinanbmw.com and look for yourself.
Thank you and **** off.
Jay

chromius
02-23-2004, 04:12 AM
Originally posted by BMW BMXer
Weld the spider gears.

Only drive straight.

LOL Thanks man, I needed a good laugh....I would love to see objec try and turn a corner with a completely locked diff in his 800hp M3:D

and BTW regarding the chip, even if the HP and Torque isn't at the peak, which for the most part it is at like 3000 RPM, you would still be gaining the power somewhere along the curve, and it all depends on what you want, personnaly I don't want all my power at 6000 RPM I want the power where it is used most ie.2000-4000 RPM just about the range a typical car is when its pulling out of a corner, the more you can raise the rest of the power curve the flatter the curve will be, which in my opinion is where I want my car to be, I want to be able to pull hard no matter where the engine is in the RPM range....just my 2 cents*th-up*

Digitalwave
02-23-2004, 01:18 PM
Chips do have good gains and are definately worth the money, but people just think that they can get a chip, intake, and exhaust and have 200hp. It doesn't work like that.

chromius
02-23-2004, 01:26 PM
Originally posted by Digitalwave
Chips do have good gains and are definately worth the money, but people just think that they can get a chip, intake, and exhaust and have 200hp. It doesn't work like that.

You are right, normally it dosen't work like that, but as far as eta's go, its pretty close, on the torque line anyway. and HP gets a nice boost also. When it really comes down to it though the only way to tell is by a dyno before and after, everyone's car is different.

Skunk#1
02-23-2004, 02:47 PM
objec, why bother. man all you have to do is pick up a book. dont weld the diff unless you have an all out race car that stays on the track. because the way it sounds is that you dont know anything and by that i mean i dont think you know anything about cars or driving, so i would hate to hear that you went and welded your diff and lost control of your car (the m3 w/800hp) and wrecked it.

but then again you could always reimagine it later.

BMW BMXer
02-23-2004, 03:25 PM
Originally posted by Digitalwave
Chips do have good gains and are definately worth the money, but people just think that they can get a chip, intake, and exhaust and have 200hp. It doesn't work like that.

Eurostyle never said hp. He said tourque.

Eurostyle
02-23-2004, 04:26 PM
Originally posted by BMW BMXer
Eurostyle never said hp. He said tourque.

Yeah....but some people type faster then they can think...But funny thing is, 2 pages later they are still at it!!!

Digitalwave
02-23-2004, 04:33 PM
I meant 200hp because I was exagerating. I knew eurostyle was talking torque.

BMW_M52_M20
02-23-2004, 06:38 PM
And so was I which is what I origionally posted in the first page of this thread!:rolleyes: