Best e36 diff ratio. Best E36 Diff Ratio? By UDM Motorsport in forum Track, Auto-X & Drag Racing sponsored by Bimmerparts. See THIS SITE in the Gearbox section. If you are doing a lot of highway driving, you may want to opt for a longer gear ratio (smaller number) to get the best top speed and lowest RPM. 10, 3. The kit includes a 4. (i don't) if you care about autocross where you risk bogging in 2nd gear (I don't) if you care how much power you have in a given gear (rather than Differential is smooth with no issue. Best non M ratio in my opinion. In todays uploads I show you how you can run a small case diff in your 323i/328i without having to change your driveshafts. 07 diffs into 3. They had to use a shorter ratio diff on the e46 to keep gearing and performance similar to the e36 once they had fitted the bigger 18 / 19in wheels. 38 from an automatic M3. BMW E30 Differential Ratio Guide If you're swapping the drive train in your RWD BMW you will likely want to swap out the rear differential to one with a ratio that suits the transmission and your driving characteristics. Perfect for a range of BMW non-M models. 73, 3. I still can't get my head round a normal diff works either, just the principal. The same car driven for track days or just for more spirited country lane driving may do better on a 4. Looking for the ratio that is the most torque with the best MPG. This is what I've found, please confirm or correct me: Large 210mm Cases (any gearing) -E24 M6 -E31 850 (auto has 3. From the description, with just a little bit of fabrication, this will allow you to bolt in a differential from a 5-Series (E34 chassis) or 7-Series (E32 chassis). May 29, 2025 · There are advantages and disadvantages of using a shorter or longer gear. Below is a table of E30 diff ratios, all are interchangeable. See why we stand out from the rest. Posts 8,892 My Cars Turbo 97 E36 M3, 99 M3 I think for those of us that mostly just terrorize on ramps and the street, the best differential is whatever gearing, at your power level, helps you completely hook in 2nd gear. 27 diff. The E30 325iX model was the first BMW to have all-wheel drive. 91 -E36 Euro (w/3. com Replies: 11 Last Post: 05-15-2007, 12:58 AM Feb 16, 2022 · A great guide for all E36 transmission and differential information. To get a close idea of what the ratio is, mark the axle and input/pinion shafts with twink to a reference point on the diff housing. Can’t quite figure out the ratio but i’m right at 3500 rpm doing 80 mph on the highway. Do you thing putting 3,46 ratio will make the car faster on drag racing and better for drift? Every custom-built diff is fully rebuilt with seals and bearings. Upgrading your BMW’s differential from the factory options provides unique benefits for different driving styles. Removed from manual 95 325i with 177k miles. So I have my differential 3. 91 Differential Swap Impressions All times are GMT -5. Hi all, was wondering if someone could tell me the best way to go about getting better acceleration from an e36 325i via altering diff ratios? The differential ratio of manual-trans '95 models is 3. 10 Short Ratio Ring and Pinion Set for BMW 188 mm Differential Quicker, easier, cheaper and with all the benefits of an engine upgrade : the short ratio gear set is, without doubt, the best modification you can make to your vehicle for all kinds of motorsports (trackdays, drifting, grip, rally, etc). 0 respectivally. I have no idea what the stock ratio is though. We also design and supply bushing options to reduce driveline wind-up, finned differential covers for better cooling, and more! Ratio Changes - Changing the differential gearing is one of the best and most-effective upgrades you can make on any BMW (old or new). The BMW Z1 roadster was also based on the E30 platform. The first BMW M3 model was built on the E30 platform and was powered by the high-revving BMW S14 four-cylinder petrol engine. If you can't find a diff from a 318i/320i auto, the second best is a 323/325/328 auto, not a 318/320 manual. The diff from a 318i or 320i won’t fit as they are a different size. 45. 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. 6 diff but I'm sure its the same as the 1. 73, 4. 9x, 3. 23:1 Best choice in used factory diffs is the 3. Data: Each one of these transmissions has different gear ratios per gear. 64 ratio and I presumed that the 325i is These generally have lower ratios due to the fact that the 5th gear on an E36 manual box had a 1:1 ratio, compared to the typical 0. I have a euro spec 325i 1994 with ZF 5HP18. diffs, all you need to know (updated) Seeing as many of these questions get asked multiple times I thought I’d put this together for future reference. 64 aftermarket built diff works well, but had me wanting a 6th gear on anything more than a brief highway trip. 46, 3. Applying the terminology differently to different types of gearboxes would only increase the confusion, best to just think of a gearbox of any type as a gearbox. 2 M3, which is 3. The Compact diff looks like an E30 diff but it's not - it's an E30 casing with E36 internals. I want to do a diff swap and mani upgrade on my 323i MSport, but im hesitant to go 3:46 because from what iv read, you get torque, but you loose some top end (if thats accurate). That ran a 4. Dec 5, 2019 · Best E36 Diff Ratio? By UDM Motorsport in forum Track, Auto-X & Drag Racing sponsored by Bimmerparts. Contained in this document: Choosing a Performance Differential, Doing the Maths, What works best in your E28, Real World Examples (E28, E23), E28 Final Drive Ratios, E28, E23, E24 General Information, E36 Final Drive Ratios, E36 General Information, E30 General Information, Rebuilding Tips, What Does a Limited Slip Differential Do A table of BMW gear ratio and final drive for various models including E30 E36 E46 E82 E85 E86 E88 E90 E92 and more. Thx I really want an LSD for my '96 328iS, but I want to keep the same gear ratio so I'm not burning through gas on the interstate. As far as diff ratios go, from my experience with several engines and diff gears in my 323i, Here's my 2 pfennigs. A great guide for all E36 transmission and differential information. It was the first M3 to use a six-cylinder engine, which has since been used in the majority of M3 models (albeit in turbocharged form since 2014). 73. Differentials receive torque from the rotation of the engine through the Oct 10, 2023 · So i’ve got a 1998 323i, 5 speed transmission with some sort of lsd in it already. 73:1 E30 autobox. 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 A few recommendations on Differential Gear Ratios for E10, E21, & E30s from Aardvarc. Could go slightly quicker again with a 3. It's 3. We started looking more in depth into it and decided to fix a lot of issues we saw in the industry. net. High gear ratios are lower numerically for higher top speed regardless of whether the gears are in a transmission or in a diff. 2l) M3) -E38 730, 740 (V8s), 750 Please help I am really confused !!! So I like to do my research and I found that on the international sites all 325i and 328i auto diffs were the same size and had a ratio of 3. 15 3. history The Borg-Warner diff was first fitted to later model VK’s, it had a 2spider center with 25 spline axles. Other option is aftermarket like you say I guess Best ratio diff for e36 328i Coupe? Thread in ' Technical Questions ' started by j-mane36, Jun 19, 2016. 1 diff stock, but the touring they upped the ratio due to the weight so that it's 0-60 times were still comparable. Sorry for basic question just ive only ever owned jap cars before. 46 40% lock variable ramp angle. If you are hard core and don't mind revving on the highway, a 3. Next, fill in the ratios for your gearbox, and differential. To convert 2. 9x, and a few others. The E36 M3 is powered by the BMW S50 straight-six engine. '96+ E36 M3 final drive gearing remains the same in the 5-speed or 6-speed, same ratios in both gearboxes 1st-5th. What is an ideal diff ratio for drifting and if lsd or welded would be better (for a daily that is used mostly on the street) Discussion about ideal diff ratio for drifting in a daily driven car, The standard ratio taken from an e46 m3 diff is the cheapest and easiest one to go for without making the car horrible on long journeys. Hoping to spend under $400 If you were to use a diff from a 323/325/328 manual that car would be ridiculously slow. 93 - 3. 3. Everyone is kind of familiar (even if you don’t know what it means), with rear-end differential gear ratios (3. We will walk you through pros, cons, and differences between each type of differential found in BMWs and explain gear ratios to help you choose the best differential for your BMW and specific driving needs. Step 1: Enter Final gear ratio (differential) Step 2: Enter Tire Size Upgrading your BMW’s differential from the factory options provides unique benefits for different driving styles. 38:1 or 3. . Considering i do a decent bit of highway driving, what would be the best lsd diff to boost my mpg and lower the rpm while doing that speed. If it's an open diff, weld it and see how I like it compared to my stock M-Variable Diff. SUBSCRIBE for weekly videos!#e36 # Hi, Right now i have 3. Learn how to manual swap your E36! This guide will tell you everything you need to know to manual swap your E36. It is very hard to find a medium case diff with a ratio shorter than 3. Which iirc is the diesel diff right? Or a 1. Ive seen 2. 23:1 for all other years (for slightly better acceleration) and all automatic versions. You can't properly us E30 output flanges on a Compact diff or vice versa. I Need a list of Differential Gear Ratios for I6 e39 M54 525 Auto to manual swap set up. this would be the best option you can fit the small case 318iS diff but you will need to swap the rear half of the propshaft to the 4 cylinder item and change the output shafts for it to fit however if you do manage to find a 318iS LSD (they are pretty rare) it will be anyones guess as to how long it will last with the extra power and torque going through it you could try a 3. Made from elite tool steel, our set eradicates common issues like metal shavings. Most of the automatic cars came with a shorter (bigger number) gear ratio resulting in faster acceleration. Listed below are a number of common settings for various BMWs, but it will also calculate RPM/Speed for any vehicle you have the data on. 8, I was looking on ebay for a open diff and there seems to be loads of different ratios. 4. Yeah, I remember my old 318i sedan. 10 ratio ring and pinion set, which comes as a direct replacement of Bimmerforums is the preferred online BMW Forum and community for BMW owners. I stumbled upon the “E36 Bullet-Proof Differential Conversion” kit from RallyRoad. Your car will have a medium case diff (188mm) the 318i and 320i used a small case diff (165mm from memory) and the m3 uses a large case (210mm). 15+ a spacer is required for the crown gear. Experience the ease of an open diff with the power of dynamic lock capability. 15:1. 15 diff ratio in my car. 15 in Australia as no factory E36 had one. On the VL’s they fitted 4 I'd like to try to score a cheap diff and swap over the gears. Following the launch of the E36 3 Series in 1990, the E30 began to be phased out. But that in case if the car is a ///M 3. Want to get some more cornering acceleration out of your BMW? Do you want to add a limited slip differential to your car? Just after some advise , im selling my s14a and going for a e36 bmw instead opinions please on best setup for 60% road use and %40 drifting ie what diff / best coilovers etc. 1st is probably useless with any diff, but if you can fully connect in 2nd with your tire/wheel setup, then you have the hi guys I have a 1992 e36 its got stock diff in it wich is open diff what should I changed my diff to for burnouts and stuff :dunno: need help guys It is very hard to find a medium case diff with a ratio shorter than 3. 91 I have now learnt that from some of you on the forum the 328i had a 3. 91, 4. 23 is the standard ratio in '96+ M3 whether fitted with 5-speed or 6-speed. If the engine is built up or it's a stroker, go with the 3. Best choice in custom built diff is 3. First: it's clear that lower diff ratios (3. 25, etc). 0 M3 LSD at 3. 2 and 3. The time now is . 23:1 ratio. 38 Ratio LSD Limited Slip Differential 33102228291 at the best online prices at eBay! Free shipping for many products! A great upgrade for drivers looking for added acceleration and grip for their E36 323i/325i/328i! A differential upgrade/rebuild for your E36 delivers performance far above the original factory spec. 81:1 of an E30 manual box or 0. ie a 287:1 will be a fraction of just under 3 revolutions of the pinion to one revolution of Choose RacingDiffs LSD Conversion for unparalleled durability and performance. A great upgrade for drivers looking for added acceleration and grip for their E36 M3! A differential upgrade/rebuild for your E36 delivers performance far above the original factory spec. I read somewhere that the differential from BMWs that have ZF 5HP18 gearbox is 3. Each gear of the gearbox has a set of gears to give its own ratio as well. Your best bet is to get something from either a 325 or 328 as they will bolt straight in. 23 ratio, but requires the whole EVO rear subframe as its a large case diff. Never fear as you may have more gear ratio options than you may have realized. 64) -E34 M5 before 6/94= 3. 10, etc) are good if you care how fast you launch off the line. Find many great new & used options and get the best deals for BMW E36 M3 OEM 3. Diffsonline has 20 years of expertise in BMW differential upgrades and rebuilding. 2002Haus offers a custom subframe which allows the installation of a E36 diff OR is it possible to get E36 guts in my 2002 case? If it's possible who do you recommend and how much should I expect to pay for such a unit. But the most common recommendation is 3. I’ve seen lots of different results online for what diff ratio is in the 1998 328i Auto and was wondering if anyone had a solid answer. To calculate the best diff for any given wheel or speed, [check out this link]. Rotate the pinion and count the turns and fraction of turns when you rotate the pinion to get the axle to rotate once. com Replies: 11 Last Post: 05-15-2007, 12:58 AM Differential Ratio What ratio are you guys using in your E36 LSx swaps? I need a new diff now, but would like to be able to use it after I complete the swap (probably over the next winter) What differential came on the 1990 325i? I'm looking for more power and better gas mileage are these two thing mutually exclusive? If I can’t have both, which differential will give me the best of both worlds? What is everyone running? Bmw e36 diff ratios/models Thread in ' Technical Questions ' started by DoriDave, May 30, 2011. Mar 2, 2015 · Best ratio diff for e36 328i Coupe? Thread in ' Technical Questions ' started by j-mane36, Jun 19, 2016. bqcm3h, fsyhni, hdhii3, z3nc, xp9r, c5d2c, d4bzp, pwhz, xnx5ic, vm7k,