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Old 05-19-2010, 05:23 AM   #31
sam can man
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thanks for some feed back. I still have not done my homework on my own car yet but i want less power, more fuel efficent! totaly opposite than normal but i guess that i am into recycling tooo much.... Anny help??? 98 318Ti manual transmission. PLEASE HELP ME all i want is to go 80-90 on the highway and have my RPMS ALOT lower!
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Old 05-19-2010, 07:13 AM   #32
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Mine gets about 27 at 80... Good enough for me...The M44 and M42 don't like low rev lugging. Wrong tool for the job...


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Old 05-19-2010, 08:02 AM   #33
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Originally Posted by pdxmotorhead View Post
The M44 and M42 don't like low rev lugging. Wrong tool for the job...


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+1, Lowering the RPM's doesn't necessarily improve fuel economy. While it may help you in 5th gear at highway speeds, you have to consider city driving and stop and go. If you're struggling to take off and get up to speed, you're wasting more fuel than you'd be saving on the highway. Couple things you can do to conserve fuel, replace your o2 sensor(s), replace your air filter, check/replace you spark plugs regularly, correct tire size & pressure, and most importantly have a light foot.

I've heard so many people ask why their gas mileage sucks, only to see them driving their car like it's a rally car. Take it easy. I mean it's cool to stretch your engine out once a week, I do it, but hey if you're always in a rush to get somewhere, perhaps you can just plan your day out a little better. You'll notice the rewards at the pump if you'd simply slow down.

And finally, maybe not a practical option, but it's been tested and proven that some forced induction applications have actually shown improvements in fuel economy. Now this doesn't mean if you supercharge your car you're gonna get great gas mileage. Most people install superchargers and what's the first thing they do? They go out and try to race everything on the road. Well there went fuel economy right out the window about seven blocks back there.

But yes, if you have a supercharged or turbo'd engine WITH PROPER TUNING, you will notice a significant increase in fuel economy provided you don't drive like a maniac. The reason being, your engine will burn fuel more efficiently as it takes less energy for the engine to get your car up to speed and maintain it. However, I should remind you about not being practical. Considering that a supercharger costs $3800, how many miles would you have to drive before you save that much in fuel costs? Probably a couple hundred thousand Then you have the reliability issue. Most forced induction applications need special maintenance such as turbos/blowers being rebuilt/replaced. They usually result in abnormal or excessive wear on other components that are forced to work a little harder.

I just realized this is a diff thread, so I'll try to get it back on topic. E28 3.25 open or LSD, E30 rear cover, E30 output flanges, E30 halfshafts, shimmed ABS sensors, new diff cover seal, fresh gear oil = lower RPM's @ highway speeds and reasonable acceleration around town

Last edited by cooljess76; 05-19-2010 at 08:05 AM.
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Old 05-19-2010, 10:44 PM   #34
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My clubsport saw well over 35mpg at 80mph on the trip from new hampshire to toledo, ohio. Also, my m50 with a 4.10 rear end made nearly 30mpg at the same rate of speed. Its not about the revs, its about its tuning and what its designed for. These arent american cars, that require low rpms to sip gas efficiently.
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Old 06-02-2010, 01:01 AM   #35
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Do any of y'all know if a small case 3.45 lsd from a 92' 318is is a direct swap with the 318ti (1996)? I have searched a ton but I cant really find a definitive answer.
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Old 06-02-2010, 02:50 AM   #36
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E36 coupe/sedan diffs WILL NOT FIT the Ti:



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Old 06-02-2010, 03:43 AM   #37
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Jess, Awesome post man! That was exactly what I was looking for. Muchos Gracias!
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Old 06-02-2010, 03:51 AM   #38
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Jess, Awesome post man! That was exactly what I was looking for. Muchos Gracias!
No problem. I should've did that a long time ago Regular e36 diffs mainly don't fit because the subfames are completely different due to the e36 coupe/sedans using multi-link rear suspension and the Ti, Z3 and e30's using semi-trailing arm rear suspension. I believe Rogue Engineering makes a kit that allows us to use a dual ear cover, but you still have to use the e30 style diff. Haven't heard of many 318ti's having problems with the subframe tearing out of our floorboards like they do on the Mcoupes and Z3's. The e36 coupes and sedans are known to have subframe failure, and they use the Dual Ear diff covers???

Last edited by cooljess76; 06-02-2010 at 04:00 AM.
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Old 06-02-2010, 07:48 AM   #39
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jess i apreciate the computer link ... now if i nly new how to use the computer and knew how to read.. can you shoot me an e mail @ samjadczak@yahoo.com and give me a # to call and I want to ask some domb questions about my 98 318 tI i have alk ot of ideas but KNOW where to start from but hear say?!!!
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Old 06-02-2010, 04:21 PM   #40
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I have something to contribute here... I noticed that the LSD unit inside a regular e36 small cased diff (from a 318i or is) is the same as the LSD unit inside the ti diff.
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Old 06-13-2010, 08:57 AM   #41
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thank u every one!!!! one mor question ,,, after reading all of that,,,, I want limited slip in my rear with new gear oil/!??!!!!!!!!!!!!! can i take the guts out of the 95 318 iS auto and adapt the limited slip gearing into my diff case that is allready on the 98 bmw?
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Old 06-13-2010, 10:18 AM   #42
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thank u every one!!!! one mor question ,,, after reading all of that,,,, I want limited slip in my rear with new gear oil/!??!!!!!!!!!!!!! can i take the guts out of the 95 318 iS auto and adapt the limited slip gearing into my diff case that is allready on the 98 bmw?
Hey sam, although I've never done it before, I'm pretty sure it can be done since both diffs are small case diffs. The ring and pinion should be the same size so you should be able to use the stock 3.45 gears with the limited slip out of the 318is diff.
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Old 06-15-2010, 07:12 AM   #43
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I'm considering picking up an e30 small case 4.10 lsd from a 91 318is. Would it be a direct swap for my current stock small case diff? I should be able to reuse my diff cover, flanges, and half shafts, correct? The price for this diff is just too good to pass up if it will bolt up easily.
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Old 06-15-2010, 07:56 AM   #44
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Originally Posted by spidertri View Post
I'm considering picking up an e30 small case 4.10 lsd from a 91 318is. Would it be a direct swap for my current stock small case diff? I should be able to reuse my diff cover, flanges, and half shafts, correct? The price for this diff is just too good to pass up if it will bolt up easily.
Yeah Dave, it'll be a direct swap since it's a small case e30 diff. You won't need to swap the cover or halfshafts, but you may need to swap the output flanges if the bolt pattern doesn't match your current halfshafts. The output flanges pop right out, no tools required other than a wrench or screwdriver to pry them out of the case with. Just use a sharp jerking motion and they'll come out, but again, you might not need to if the bolt pattern matches. Is your car an automatic? If so, 4.10 will nicely lower the rpms to a comfortable range @ highway speeds.
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Old 06-15-2010, 02:58 PM   #45
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Cool, that's what I was hoping you'd say. My car is manual. I've been playing with the gear ratio calculator and I'm still deciding if I'll be able to handle the new highway rpms.
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