Open to lsd swap.

[rThor432]

Thank you so much guys. I guess I'm going to hope I find a s3.73!

Haha, have fun with that! Seriously not a good choice for a streetable/daily diff in one of these cars.

a 3.73 would still get you some decent passing power until 90 or so.

..and then you run out of tach :D. Haha, 4.5k redline ftl.

[Active16Bits]

It's not going to be my daily.

[rThor432]

^^Oh, then no worries. Do you split driving duty between all of your cars? I only ask because that's what I do.. so when I'm tired of one (or it runs out of gas) I switch to another. The torque of an eta with a 3.73 will make for a hell of a stump puller!

Definitely look for diffs under E28's and E24's though. They won't physically appear the same because the diff cover is different, but they will work in your car and the ratios will be a huge advantage over what you are running now. I had one in the shop in the past few months that had a 3.91 limited slip..

[Active16Bits]

Haha yeah I do when they're running. Right now I'm replacing the heater core in the Jetta (which is a god damn nightmare) and replacing the taillight and trans control unit harnesses.

I don't really like having three cars though. I'm a 22 year old male, insurance it way too high and I'm starting to feel like I'm in over my head, so I wanna ditch the Jetta.

[Wh33lhop]

Haha, have fun with that! Seriously not a good choice for a streetable/daily diff in one of these cars.


..and then you run out of tach :D. Haha, 4.5k redline ftl.

Exactly. But, the only difference between running a 3.73 in an eta and in an i is that your powerband is much sooner in the eta. Running it at 3350rpm all day isn't going to hurt it really, it'll stress the cams a bit more than in an i as it's got 4 cam bearings as opposed to 7, but that's about it. It only seems to be stressing the car a bit more because of the position the tach is sitting at, and you won't get the great gas mileage that the eta is known for. You really shouldn't be taching the car out in 5th anyway, 90-100 is plenty fast in an E30. I've been a bit faster, but only for 5-10 seconds.

Also of note, you'll be able to take better advantage of the shorter gearing if you've got a lighter single-mass flywheel instead of the stock eta dual-mass lump.

I was estimating up from a 2.93. Not good at math

Seempo algebra my friend, 2630*373/393 = 3350

Plus I daily drive an E30 with a 3.73 so I happen to know where it sits at 80. ;)

[rThor432]

I don't really like having three cars though. I'm a 22 year old male, insurance it way too high and I'm starting to feel like I'm in over my head, so I wanna ditch the Jetta.

I know that feeling.. Both of my E30's cost roughly $300-$350 each for tax and insurance for the year. One cost $1k and the other was $2k. Not much for reliable 300k cars. I've also got an E36 M3 and when times have been tight in the past few years that's always the one I consider cutting.

[Wh33lhop]

I know that feeling.. Both of my E30's cost roughly $300-$350 each for tax and insurance for the year. One cost $1k and the other was $2k. Not much for reliable 300k cars. I've also got an E36 M3 and when times have been tight in the past few years that's always the one I consider cutting.

Fawk

My insurance bill last year was like $1kish, then I got another two tickets (don't ask), not looking forward to renewing the contract come mid-March.

[Active16Bits]

Exactly. But, the only difference between running a 3.73 in an eta and in an i is that your powerband is much sooner in the eta. Running it at 3350rpm all day isn't going to hurt it really, it'll stress the cams a bit more than in an i as it's got 4 cam bearings as opposed to 7, but that's about it. It only seems to be stressing the car a bit more because of the position the tach is sitting at, and you won't get the great gas mileage that the eta is known for. You really shouldn't be taching the car out in 5th anyway, 90-100 is plenty fast in an E30. I've been a bit faster, but only for 5-10 seconds.

Also of note, you'll be able to take better advantage of the shorter gearing if you've got a lighter single-mass flywheel instead of the stock eta dual-mass lump.



Seempo algebra my friend, 2630*373/393 = 3350

Plus I daily drive an E30 with a 3.73 so I happen to know where it sits at 80. ;)

I rarely ever go over 70 on freeways anyways. I know I might get crap for this, but I'm making it my drift car. Here in Vegas we got monthly drift events at our speedway. I hate most Japanese cars and I just love the "feel" of an e30.

So what the hell is a dual mass flywheel? I saw this when I was ordering parts for it last night: http://www.germanautoparts.com/BMW/1...2/158/19646172

I don't know if swapping to this is worth $700.

I know that feeling.. Both of my E30's cost roughly $300-$350 each for tax and insurance for the year. One cost $1k and the other was $2k. Not much for reliable 300k cars. I've also got an E36 M3 and when times have been tight in the past few years that's always the one I consider cutting.

I have the bare minimum coverage on all my cars. My premium is about 2g's a year for both cars. I havn't registered the e30 yet. It's sitting in my friend's shop's back yard.

[rThor432]

Hey Active16Bits. Don't forget to check out Sam's (Mossman's) thread. He's got several good LSD's ready to go, including an S3.73--

http://r3vlimited.com/board/showthread.php?t=162501

You really shouldn't be taching the car out in 5th anyway, 90-100 is plenty fast in an E30. I've been a bit faster, but only for 5-10 seconds.

Yeah I've never tached my car out before.. that would be interesting though-- 7,400 rpm with a 2.93 and 1:1 5th. It pulls nicely around 120 in 4th. I had the .81:1 box for a long time and I could theoretically break 200 mph with that gear. (Meaning that the E30 would definitely be "drag limited")

[Wh33lhop]

I rarely ever go over 70 on freeways anyways. I know I might get crap for this, but I'm making it my drift car. Here in Vegas we got monthly drift events at our speedway. I hate most Japanese cars and I just love the "feel" of an e30.

So what the hell is a dual mass flywheel? I saw this when I was ordering parts for it last night: http://www.germanautoparts.com/BMW/1...2/158/19646172

I don't know if swapping to this is worth $700.



I have the bare minimum coverage on all my cars. My premium is about 2g's a year for both cars. I havn't registered the e30 yet. It's sitting in my friend's shop's back yard.

Well, if you're seriously going to drift it and nothing else, you're probably going to want to get an unsprung-hub clutch and single-mass flywheel anyway. I wasn't really referring to an upgrade like that, just a 325i flywheel and maybe shave it down some.

And re: dual-mass or single-mass flywheels, the dual-mass flywheel is basically to dampen the power strokes that your engine makes. It's pretty unnecessary for a lot of BMWs that came with them, and it also dampens pretty much everything in your driveline (i.e. throttle input, clutch engagement, etc) as well as just being heavy in general. It's functionally two flywheels connected together with a spring. Your engine is connected to one flywheel and the other is connected to the clutch.

Hey Active16Bits. Don't forget to check out Sam's (Mossman's) thread. He's got several good LSD's ready to go, including an S3.73--

http://r3vlimited.com/board/showthread.php?t=162501

Yeah I've never tached my car out before.. that would be interesting though-- 7,400 rpm with a 2.93 and 1:1 5th. It pulls nicely around 120 in 4th. I had the .81:1 box for a long time and I could theoretically break 200 mph with that gear. (Meaning that the E30 would definitely be "drag limited")

7400rpm, is that what the TRM tune set the redline at? That's nearing S50B32 territory.

After I got the M50 semi-sorted I did a 3rd-4th-5th pull to maybe 120-130 just to see what it had up top, but that's the only time I've really been over 100 in this car. I don't forsee many other similar incidents unless they're on a track, even when I've replaced all the suspension/bearings.

[u3b3rg33k]

Didn't even think of that. I do remember seeing more e28's last time I went there. I couldn't find any information on the sizing of differentials in e28's though. I know theres "small" and "medium" ones in e30's.

Does this really make a difference? or is it the just the case size in relation to the ratio? Would I have to use different half shafts if I used another size differential? Excuse my ignorance, I've grown up on mostly fwd and solid axle rwd's.

Short story:
bigger case = more torque handling ability

As to the half shafts, I'm not certain.

[Active16Bits]

Ahhh I get it now. Too bad I already paid for the new clutch. I've driven a car with an unsprung clutch. I don't think I'm ready to drive something like that yet. I'm not good at drifting anyways.

And rThor432 I checked out that link you sent me. I want to see how much they cost locally first. My tax return money is starting to wither away.

[rThor432]

7400rpm, is that what the TRM tune set the redline at? That's nearing S50B32 territory.

Yep. It never, ever sees the rev limiter though.. I never shift that high, no need. Top RPM is usually 6.9-7k. Power drops off from there.

I've driven a car with an unsprung clutch. I don't think I'm ready to drive something like that yet. I'm not good at drifting anyways.

I've had several cars with unsprung clutches (on single-mass flywheels) over the past few years. An M42 with a 8lb. fly, an eta with a 22 lb. fly, and an S52 with a 10.5 lb. fly. All of them are almost strictly street driven and I have no problem with the engagement. My mother has driven my S52 E30 a few times and didn't even notice the heavy pedal (HD pressure plate) or the "snappy" nature of the unsprung clutch.

[Active16Bits]

Interesting. The cars I drove was a rx7 and 350z turbo and I kept stalling out when I tried to engage it.

[E30Gus]

I have en eta with a 3.25 diff and love it for a daily, not too bad at the track too.