E55Cent

I would like to change out my stock 2.82 gears and go to a 3.27 (14%). I found a great deal that includes the ring/pinion, ETC module, gear oil and labor for half of what I found everywhere else. I was wondering how much I gain on my 0-60 and 1/4 mile times.

I am looking at getting the gears in mid Febuary.
Thanks
Mario

RJC

It's going to help for sure...I'd estimate 2-3 10th's on the 0-60.

Stephen04E55

I wish the stock gears were 2.82.....unfortunately they are 2.65 in the E55 and 2.82 in the SL/CL cars.

Richard Galing

Mario,

Just picked up your message, glad Ralph was able to help...I was at his shop this afternoon.

E55Cent

I know the E55 210's have 2.82 but I guess the supercharged 211's have 2.65.

E55Cent

Yeah, Ralph was full of info and had some good ideas for my car. He says it will be night and day in my car.
Peace

ProjectC55

3.27 lsd? Wow,how much?

Bilal

Do you mean changing final ratio? That will mean a pretty big reduction in top speed. The W210 E55 can only rev to around 6000rpms..With max power at 5700ishrpms and such a high final ratio, you'll get maximum acceleration, but the top speed will suffer...

E55Cent

I did the charts and I should be able to hit at least 145mph. In California I won't even get close to that.

M&M

I don't know that going to shorter gears is beneficial to a car with a broad torque curve. Normally you want to stay in the lower gear longer. Remember that everytime you change up you are lowering you torque multiplication & hence getting less torque to the wheels.

Bilal

Shorter gears on ANY car is beneficial. It multiplies the torque produced by the engine, and with some 520NM+ on tap, it should prove worthwhile. Albeit the extra engine speed will intrude on your comfort and fuel consumption.

E55Cent

In some ways my engine noise will be less because now my exhaust has a slight drone at 1500 to 2000 rpm and by having lower gears it will bring up the rpms so I won't have that 5th gear crusing drone. My MPG might go down a bit some say 1-2mpg but hopefully with my new Powerchip custom software programing it will even things out. The city MPG might go up but the highway will go down.

I know alot of M5 guys change their stock 3.15 to a 3.45 and even 3.91 and love it. I did some math and with my wheel size, rpm and new diff I should be able to do the 0-62 in second gear and almost a 1/4 mile in thrid (99mph). If I could some how up my RPM limiter to 6300 the set up would be perfect for 0-60 and 1/4 mile, but you can't have everything.

Going with gears is what I know to be the best and biggest mod you can do behind Superchagers, turbos, and NOS.
Mario

Bernanke

i know this thread is SUPER old and i don't mean to dig it out of the grave but i want to do the 3.27 LSD on a E55 but some people keep saying you cannot just change the gears on a benz without reprogramming the ECU otherwise it will cause havoc but i can't find any substantial evidense where this is true (never found a documented case at all of car going into "limp mode" b/c of changed gears). can anyone chime in?

Ted Baldwin

............I have actually changed gear ratios in my CLK32 and W210 E55 S7. No, you cannot just change gear ratio without modifying the "transmission control module". This is different from the ECU. Easy way to do it is to use a module from same chasis as yours, but has the gear ratio you want. If this is not possible in your case, then only person I know that can do this and has actually done it (he did my E55 S7) is Benzmac at MBS motors in GA. Unfortunately, he has left the car business. As you can see from above thread, there is a lot of talk and no real world action and info.

Ted

Bernanke

well actually the E320 did have the 3.27 gears, so you are saying it is possible to swap with the E320 EGS and be ok?

I did finally speak to MKB representative but they want $2000 for EGS and differential and even then thats for the wrong ratio (3.07, which isn't nearly as worthwhile). 3.27 LSD is what i really want b/c thats the gears the car should have come with in the beginning not these super long 2.82s (or even 2.65 on the newer amgs).

Ted Baldwin

...........the short answer is yes if you are working on a w210 E55. Alternatively, you can have yours reprogrammed...........that is where you are being charged $2K by MKB. They don't offer 3.27 partly because it is a bit too agressive and mostly because it is already available from your benz dealer in the E320. If your E55 is older than 2001, the EGS cannot be reprogrammed and swapping the unit is your only option. If you ever plan to put a s/c on the E55, do not go with a 3.27, your car will not be driveable.

..........I read your post again and you mentioned 3.27 LSD. The LSD as I understand has nothing to do with gear ratio change. I am strictly speaking of gear ratio change. You may or maynot need an LSD after the gear ratio change.

Ted

WayneE

On street tires, you may find your 0-60 and 1/4 mile times actually increase. If you run a stickier tire, you will see gains.

Since this thread was started in 2005, what was the outcome of your swap?



Your tires will really determine if you can put the power down with the steeper gearing.

JamE55

This is true. Changing gear ratio helps the car launch a bit quicker while LSD helps with traction from what i understand.

E55Cent

I never landed up getting the gears but I did supercharger it instead. The superharger was a great mod and it makes me smile everyday. The 2.82 gears are perfect with the supercharged motor. I already have tons of tractions poblems, I couldn't imagine with lower gears.

Ted Baldwin

..............in theory yes, in practice no. I have 3.07 diff in my E55 S7 and did 11.9 1/4 mile with 1.8 60ft time all in winter mode with traction problems even with BFG drag radials. My car when put in summer mode shreds every tire so far including MT real slicks. 3.27 gear ratio with a Kleemann s/c on a W210 E55 will likely not be driveable daily.

Ted

WayneE

Ted, you either aren't getting enough heat in the tires or you are running too much pressure.

rflow306

I agree most likely to much air-pressure on the dr's.

Ted Baldwin

.............understood. Will try different air pressures and burnouts this season. My point though is there is tremendous traction problem and a 3.27 diff will not be useful as a daily driver even if you figure out how to get it to hook on the track. My car on first gear (summer mode) is slike a sling short and just jerks forward and very difficult to control in stop and go traffic. I drive with 2nd gear on the street and play with first gear on the track. 3.27 diff will not help one bit.

Ted

PTE

I'm in agreement with rflow 306. Check the tire pressure after a couple of runs. They with increase up to 3 psi.
Albert nice to here from you again. I lowered my car , And just pulled the Differential yesterday. It saids 3.06 gear ratio and has a 210 351 30 08 cast into the rear cover plate. taking it to Stokes in Ft. Lauderdale to see if we can get a Quaife TBD to fit it. This thing is cast IRON and heavy!! Looks like the same unit that is in a new HEMI Charger R/T.

newton22

Go for it. Not only will it improve your times, the car will feel much punchier on the street.

I take it most people here don't cruise at top speed often, so low gearing is useless really (I could understand though, these cars were made for the autobahn).