MB_Forever

Hey guys,

I'm thinking about dynoing my E63, but the dyno places around my area have NO EXPERIENCE with Mercedes what so ever I want to ask your advise on what gear is best to dyno the car in and why? And what other notes or precautions can you give me before my dyno session?

Thanks....

Sean03S55

I think the proper gear to dyno in is 5th cause that gear has the 1.0 ratio, but I don't think 5th would show very positive numbers in power and also the speed limiter may kick in before making it to redline. With that being said, I would dyno in 4th...

onofew

Proper gear is 5th however you will hit the top speed limiter, so everyone dyoes on 4th
I’ve had my clk63 dynoed at HK mororsports dyno shop in Van Nuys CA
He’s dynode plenty of these cars

Fr33kn63

yeah I spoke with several peepz about this too because of my 63. 4th is the way to dyno. Make sure your in dyno mode. and you should be fine.
I had my limiter removed with my ECU tuning. I am going to Dyno in a couple weeks and will do 4th a few pulls and will try 5th since I have no limiter and should be able to redline the gear.

jangy

LOL at you cheaters. You always get higher numbers when you drop a gear. If 5th is closest to 1:1, then what is the excuse for changing that ratio?

Zod

Shhhh we can throw jabs at them after the numbers are out

kiding aside i think its 4th to , go look at jucies dynos i think he says he didi 4th also. Best of luck

MB_Forever

I have the 030 package, which raises the limiter to 186 mph, would that allow me a 5th gear run or do I need much higher speeds?

So since 4th gear is not 1:1, doesn't that mean the results won't be too accurate? Is there a correction factor?

jangy

The only way to have real correction factors would be to do the runs and make a correlation. Gearing has EVERYTHING to do with it. Perfect example is how some of the cars dyno'd with 20s and huge tires.

The E55s also have the dreaded speed limiter, but we still don't drop it into 3rd to avoid that. 3rd gear runs on the E55 give higher results, flat out.

Is this how the E63s went from 380 to the floor to 420?

Vadim @ FD

I usualy dyno 63s in 3rd and 4th gear as an acceleration run. Several reasons for this:

1. Doing just one gear from 2K to 7K does not correspond to the driving on the street. Car will downshift into lower gear, so numbers below 4K will not be seen on the street.

2. 5th gear is too tall, although it is 1:1, it runs out at 170 MPH. At that speed getting proper cooling on the dyno is near impossible. Once car rattles the data is meaningless and hard to reproduce.

3. 3rd - 4th gear acceleration corresponds to very likely scenario of gettin ginto a short rolling race from 60 to 130 mph.

https://mbworld.org/forums/showthrea...ighlight=vr530

rflow306

This is not necessarily correct especially on a dynojet. The dynojet calculates it's on gear ratio based on roller speed and engine tach signal.

The difference in dyno numbers from 3rd to 4th on an e55 is very minimal 3 to 5 hp at best. You should also check with Vadim when he dyno'd your car because he has stated that the dyno he uses does not supply enough air to dyno in fourth, so your results could have been in third.

jangy

I get what you are saying. I also know what Vadim is trying to learn (not prove) with his dyno runs. The only reason I say that the rule of thumb is to dyno in 1:1 is that it is the only way to try to match up numbers from car to car and shop to shop. Sure, cooling is an issue, but it is on all dynos. That is exactly why the really nice and expensive dynos are either in a wind tunnel or have massive fans.

I also agree that the difference is minimal, because the results are much tughter with a lower gear pull. Again, for tuning, I think cars should be dynoed from a dead stop all the way through all gears. Why not collect all the data? Unrealistic being said, then I guess we can only try to set our runs up as close to "normal" as possible to get a live read.

I ask again, were the 63s that dyno'd at 380ish run in 4th?