Best e30 diff ratio. 325's mostly come with the 3.
Best e30 diff ratio 91 out of an ix, and when I swapped to 3. 73 - automatic transmission 325i Aug 18, 2004 · Decoding the Diff's Dogtag The differential's "dogtag" is located on the right side by the speedometer pulse sender on a large diff, and on the top left by the diff mount on a small differential from the factory. 27 be better?? I Would rather double check with you guys, than go on my own assumption, as gear ratios confuse me a little! Cheers! Hi everyone, I'm using the M52 engine, (I think thats right, it's the 2. There are three elements involved in determining the best gear ratio: engine rpms, vehicle speed, and tire diameter. For example, a high ratio diff (4. My top speed is also gearing-limited and not power-limited. 91 ratio differential. 25. Below is a list of ratio and cars in which they can be found. 93 diff in his 325 and it seemed to run for ever what ever gear he was in (85mph in 2nd gear- 115mph in 3rd gear). The facelift 325i Sport had the 3. In addition, differentials from the E28 5 Series BMWs (1982-88) will also interchange with the E30 six-cylinder 3 Series cars, and this becomes key to modifying the early eta engine E30s. The car currently has a 2. 25) with a low-ratio gearbox (2. 10 medium case can not be used, but you would need to get one from a US spec M3 and it would also make it rev very high at motorway speeds. By ED1RTY, April 18, 2007 in Performance. Nearly all 2002s did not have a limited slip differential. then you can install it into your E30 :) ***** The same car driven for track days or just for more spirited country lane driving may do better on a 4. Non-California models from 1976 were fit with a 3. Written by Mike Oswald on December 22, 2021. The “shorter” the gearing (higher ratios like 4. 93 or 2. 79 be better and where would i sorce them in the uk and roughly how much should i pay Apr 8, 2011 · and you have a E36 LSD, and you want the ratio and the LSD in your e30: 1. Also, the CV joints bolt to the different diffs just as well. 15 - M3 3. 73 should be ok. 8 gearbox is a tough old unit, but keeping it will give you hassles of getting a correct diff ratio, E36 diff will not fit E30, you can get the guts of the E36 diff rebuilt into the E30 casing, but that will cost you a few quid. Except both of my diffs are open so they kind Mar 8, 2011 · Bimmerforums is the preferred online BMW Forum and community for BMW owners. 15 final drive and above. Apr 26, 2009 · BadDave wrote:Some info from the wiki for you fella E30 LSD Ratios Below is a list of ratio and cars in which they can be found. Forums. im guessing i should just use the one that is currently in the car, but would the 4. 10 on the Getrag 420G 6-speed transmission for E46 M3. gut e36 diff 3. 15 3. Apr 15, 2007 · As far as I know the 318's, and M3's (e30) come with the 4. e36 320I m52b28 e30 316 m52turbo Jan 27, 2011 · The 2. The low gears (3. I've got a lot done to the engine, but I'm abit stuck on the diff. I'm using the 6 speed gearbox from a 1998 E36 M3 Evo, but I'm not sure what diff ratio to use. diff ratios. 46 3. ED1RTY 2 ED1RTY 2 Bimmersport Legend what Diff Should be in a 1990 316i Auto? (4. Our professionals are here to help make sure you find the answers you need to your questions and our community is here to help other brainstorm Apr 18, 2007 · best diff ratio for e30 320i. 46 etc what Diff Should be in a 1990 316i Auto? (4. Revs a bit higher on highway and maybe burns a tiny bit more fuel but the m42 is efficient enough anyway. 07). 3. the same driveshaft bolts on to a big case diff as it does to a medium case. Other models used a Large Case which is not directly interchangeable but the internals can be swapped. Except months later I pull the old diff apart and its actually a 3. 07:1 differential with the close-ratio gearbox raises second gear so much that the engine will be “bogging” coming out of the slowest turns—and you don’t want to downshift into first. Jan 26, 2017 · The standard facelift 325i and 325iSE had the 3. Gear ratios determine how “short” or “tall” your gearing is. Below is a gear ratio chart showing what your engine RPMs would be at 65 MPH based on your tire diameter and differential gear ratio in third gear (1:1 transmission ratio). BMW Differential Gear Ratios. Ratios. Dec 27, 2005 · hi guys. Dec 15, 2018 · With that diff ratio the 320z zf is the right gearbox choise. 325's mostly come with the 3. 73 I apparently didn't even notice there was a difference. 36 (2002 Turbo), 3. Many mistakes in that wiki diff ratio guide. 15 have differ inner assemblies and can’t be switched into diffs that Mar 13, 2022 · Weighing in here as well, since I will have the M52/ZF combo in both my E36 and E30 shortly. Aug 25, 2006 · The sole exception is the E30 M3, which uses a six-cylinder-type differential, thus providing a source of 4. 10 ratio or any other 325i for that matter. 93) the less Oct 28, 2009 · You are better using an M50 box, the diff on the back of your donor touring can be rebuilt into an E30 diff case and give you a perfect ratio. That's not to say a 4. A 324d or td prop will fit straight on the M50 box, or you can use a prop from an E36 328i with an E30 centre bearing If anything, you need to move the engine backwards into the bulkhead Jun 1, 2020 · Hello, having a bit of difficulty deciding what to do having some problems with my rear diff, I currently have a 316 coupe I am swapping to a m20, I’ve been looking on multiple different discussions online and not really got a clear answer, I believe I currently have an open 4. Dec 2, 2022 · Differential final drive, separate from transmission gearing, ratios are also listed. e. 64, 3. A differential upgrade/rebuild for your E30 delivers performance far above the original factory spec. S. ED1RTY 2 ED1RTY 2 Bimmersport Legend 320Touring E30 Zone Team Member Posts: 12316 Joined: Fri Feb 11, 2005 11:00 pm Location: Glasgow (Scotland) diff ratios. Jun 23, 2008 · Hi, i'm doing some upgrades on my car, its a 323 with dogleg gearbox and lsd. 1) the more acceleration but less top speed, the taller the gearing (lower ratios like 2. i. I prefer the 4. 07 and below) and high gears (anything higher than 3. 25 ratio or thereabouts. My E30 has a M50 swap and 5-speed. 10?what is the best diff for E30? is it 325i? Menu. 10 that is stock in my M3, great mileage on the freeway (31 mpg at 73 mph) its short enough to work for autoX, might be a little too tall for track use. 5L 24v non-vanos engine), for a base for my turbo conversion for my E30 Cab. After I bought my 325i the diff started making noise so I replaced it with another 3. 73 feel really close. Mar 9, 2017 · what Diff Should be in a 1990 316i Auto? (4. Hi all i am looking to do a m50 conversion including 5 speed box,i've looked at a few sites and a few have suggested using e30 m3 diff 3. 17 posts • Page 1 of 1. I would like to swap to a much higher gear ratio. I use the motorway everyday for work so would a 2. 64:1 open diff as standard, which is fine for normal use, being a well suited ratio. The rule for swapping gearsets is that you have 2 ranges. Moderator: martauto. E30 1984 - 1993: 318i/is Learn more about fitting a differential. A lot of people talk about changing their diff ratio e. General consensus suggests the best final drive ratio for a manual E28 535i/528i is 3. 91:1 LSD as standard, which is to be honest, a bit on the low geared side, but it was fitted because the facelift Sport was fitted with a slightly lame low compression M20B25, so needed the lower ratio to compensate and give 3. Those are dirt cheap and can be acheived from many different bmw models. upgrading to 3. 10 in my 318is with a 4. Our professionals are here to help make sure you find the answers you need to your questions and our community is here to help other brainstorm E30 Diff Ratio Query. Jun 15, 2017 · Depends on the application. 73, but I just found out recently that a friend of mine had a 2. 10??) I also have a (small case) 4. 27 (very rare). At Bimmerforums, you will find technical how-to information maintenance specifics audio advice wheel and tire combinations and model specific details not found anywhere else. Gearbox ratios are also dependent on the ratio of your diff. 27 be better?? I Would rather double check with you guys, than go on my own assumption, as gear ratios confuse me a little! Cheers! what Diff Should be in a 1990 316i Auto? (4. Need technical Q/A then you're in the right place. Discuss general engine, turbo and supercharger conversions in this section SAE30 E30 Zone Newbie Posts: 71 Joined: Sun Jan 22, 2006 11:00 pm Location diff ratios. 27 be better?? I Would rather double check with you guys, than go on my own assumption, as gear ratios confuse me a little! Cheers! 320Touring E30 Zone Team Member Posts: 12316 Joined: Fri Feb 11, 2005 11:00 pm Location: Glasgow (Scotland) Jan 16, 2016 · After 8 months of searching, I finally entered the E30 cult with a 1984 325E purchase. 27) combined with a high-ratio first gear (3. 91 and 3. It's approximately 2"x. E36: My current daily driver is an E36 with a mostly stock M52/ZF320 & 3. 64 gear ratio differential. if you are using a e30 type box getrag 240 or 260 then something like a 3. 10. An E30 on stock 24” tall tires in Getrag 260 5th gear (0. E30s used either a Small Case or Medium Case differential. The only bolt in solution would be to fit an E30 M3 diff which usually is a 3. install e36 guts into e30 diff shell with proper OEM BMW speed sensor ring (chopper wheel) and genuine proper length speed sensor. Currently it has a 2. 64 - prefacelft 325i; 3. I like my 4. 07:1 differential ratio. 73 will provide the best 'Bang for the Buck' because of the slightly higher acceleration "if your going to generate extra cabin noise, you may as well select the ratio that gives the best acceleration". 72) will make first gear useless. Reply to this topic; Start new topic; Recommended Posts. Listed below are a number of common settings for various BMWs, but it will also calculate RPM/Speed for After spending a whole summer with the car, we've decided to make a change to the differential final drive ratio. 27 be better?? I Would rather double check with you guys, than go on my own assumption, as gear ratios confuse me a little! Cheers! Dec 22, 2021 · Cars / e9 / Misc Information / BMW Differential Gear Ratios. 23 3. The only caveat is that an E30 uses different half-shafts, and thus the output flanges on the medium case diffs are different E30 vs E28. 73 diff is doing 153 at factory redline. aparently sometime ago the diff was changed to a shorter one, so now the revs are very high even on 5th gear, im talkin 4000 rpm on 60mph. 27 be better?? I Would rather double check with you guys, than go on my own assumption, as gear ratios confuse me a little! Cheers!. 15 into an e30 diff of 3. Ratios longer than 3. Home. i know the e21 diff internals are the same as the 5 o 7 seven series, so i would like to change to a bit taller diff so she can run free on the highway, i would like to get about what Diff Should be in a 1990 316i Auto? (4. The "dogtag" is an aluminum strip with numbers and perhaps letters imprinted on it. ) Nov 5, 2019 · Gear ratios commonly available in the U. 93 and was a blas 320Touring E30 Zone Team Member Posts: 12316 Joined: Fri Feb 11, 2005 11:00 pm Location: Glasgow (Scotland) Sep 6, 2005 · best way to find ratio is to look on the tag (located on the rear of the diff. 48 in first, for automatics) would be an appalling combination for city driving, with the acceleration of a Ratio: Quick Select е30 325, e34 520 (getrag 260) e36 316/318/320 (getrag 220) e36/e46 328 & e39 528 ( ZF ) e36 m3 / e46 m3 (Getrag 420G) e46/e90 330d 6spd (ZF GS6-53DZ) e46/e90 330i 6spd (ZF GS6-53BZ) Oct 23, 2006 · The interfaces between the diffs are identical. 91 open diff. 64 - prefacelft 325i 3. 45 from an auto 318ti. This gives us another reason to lower the 3. Buy a diesel or a hybrid if youre that worried about efficiency. E30 Diff Swaps The E30 is becoming one of the most swapped chassis in the world with powerplants easily capable of producing 1000+ HP. 15 - M3; 3. Diffsonline has 20 years of expertise in BMW differential upgrades and rebuilding. 73 - facelift 325i Mar 17, 2023 · Next, you need to confirm your vehicle's measurements. 73 limited slip. if you are using a e36 gearbox getrag 250 or zf tyoe etc with the 1:1 top ratio then you want lower numbers like 3. g. You can have all the power you want, theoretical top speed is a math problem that’s a function of trans ratio, diff ratio, tire size, and RPM. Below is a table of E30 diff ratios, all are interchangeable. 91 or 4. Jack car up so that both wheels are off the ground then mark a point on the input shaft and the wheel. It's amazingly zippy around town and fun for 0-60 runs. paddy2bsure E30 Zone Newbie Posts: 25 Any e30 diff with a S stamped onto the casing and with a serial number starting with “S” is a limited slip. The car runs fantastic, but I am interested in a differential swap. Oct 7, 2009 · I've occasionally seen questions in this section with regard to ideal differential and gear ratios, and the operation and setting up of a limited slip differential on I replaced my 4. . Nov 24, 2015 · No 325i sport ever used the 4. We would like to show you a description here but the site won’t allow us. 91, 4. Nov 6, 2019 · But if you do, you must take note on what ratio differential you currently have and what ratio gears you WANT to go to. 10 ratio in my diff and was wondering if that would be fine to leave in there or would I be best off changing, I’m May 5, 2022 · The 3. 10 limited slip diffs for the 325i. Discuss general engine, turbo and supercharger conversions in this section SAE30 E30 Zone Newbie Posts: 71 Joined: Sun Jan 22, 2006 11:00 pm Location Oct 1, 2013 · Bimmerforums is the preferred online BMW Forum and community for BMW owners. Sep 17, 2023 · Note: Be careful swapping in longer ratios than 3. An OEM BMW medium case differential will handle gobs of horsepower but its breaking point will ultimately depend on how much torque your setup makes. 45, 3. To make this easy, you must have the gearset for the differential that you want to change. 64. (Remember that lowering the ratio produces a higher number. In contrast, a low-ratio diff (3. The same car driven for track days or just for more spirited country lane driving may do better on a 4. To calculate the best diff for any given wheel or speed, [check out this link]. 45 ratio for acceleration and driving around town. what Diff Should be in a 1990 316i Auto? (4. 27 diff. are 3. Most 2002s came with a 4-speed transmission and a 3. just wanna ask what is the diff ratio of std 320i e30? is it 4. 5" in size. 81) with a 3. 79 gear ratio in a medium case. Many argue that the 3. gut e30 diff 2. Next, fill in the ratios for your gearbox, and differential. 27 diff from a 320i convertable lying around. Conventional limited slip differentials like the E30's contain clutches that wear out over time (just like the clutch in your transmission). 27 be better?? I Would rather double check with you guys, than go on my own assumption, as gear ratios confuse me a little! Cheers! May 13, 2012 · which gearbox do you have. 10, and 4. If no tag then more difficult but as follows. 64 3. webvlixnkotdjoofrfzpbdmyxvswbkrrlsapopsgedxqgdgecdumxk