GT-ER

I must say...I was completely blind to some things that were going on in my car until today...and they are frightening.

Today I thought it would be a good idea to take my laptop with me and use my autoenginuity scanner to log some data. What I ended up with was the following.

1) First, I can't believe how crappy mercedes' refresh rate is on their OBD ports....it's horrid. My pulls were from 40ish to 120-130ish and I only got a few bits of data out of it. So sad.

2) This is my first scan:



This is 2nd and 3rd gear. Ambient temp was 92*. Does 14.5psi sound good for my mods? How about my timing?

2) This was my second scan. It contains two runs in one, aproximately 2 minutes one from the other. Both are 2nd and 3rd gear.



If anyone here knows how to calculate injector duty cycle, it seams like after 5500rpm my car is at 100% IDC up to redline....YIKES!!! That's REALLY bad! So bad infact that I understand why people blow these engines and am even starting to believe why adding larger injectors can actually make more power.

You can also see my IAT's max out at 153* on my first run and 167 on my second run. My only cooling mods are a eurocharged H/E. That's it.

Any thoughts?

_AMG_

I figured your IAT's would be much lower because of the H/E.
Well then again 92 degrees ambient temps wont help out much either.
Have you thought about water/methanol injection?

AKnight55

What are you using for a IC pump? you may want to upgrade that

GT-ER

I actually didn't find them that bad considering they were 40-130mph runs more or less. I would like to see a similar log in a car with a rear water reservoir and a better pump to see the difference. I'm sure it's better but by how much?

Stock. Some day...injectors seem like the obvious priority now.

urbamworm

So out of curiousity was this log in response to my response to the other guys logging thread? It seems like to big of a coincedence haha.

I am curious how much timing the car was pulling when it arrived at those timing numbers. Do you have any logs of the timing correction and the timing being ran in the same log? I hate how it shows as a negative number for timing too, I guess they are doing that because it is "before top dead center." And I know these cars have a narrow band o2 sensor which is mind boggling to me but can you log air/fuel and then do the calculation with the voltage given to see your air/fuel? A good log would probably be to log your injecture ms like you did but with the a/f block also so you can see if the a/f strays leaner when you think your injectors are maxing out.

And yes, you are at 100% duty cycle.

GT-ER

It's purely coincidence...lol.

Narrowband sensors are so inaccurate at anything but 14.7 that using them to measure a/f ratio is like doing brain surgery with a steak knife and a fork. It would be useless to even try.

As for the knock retardation, it barely would budge...I didn't even record the log because it was it was mostly 0 all the time except for the top of third where I saw a few blips of 1 to 1.5 degrees. Not bad.

Donald-E55

Plus 1 at 100% duty cycle and these cars have Narrow band 02 sensors?! Plus one also at the A/F

urbamworm

I am surprised that there is little timing pull with the intake temps climbing like that, kinda doesn't make sense especially when it showed that there wasn't any major boost bled off either in those other logs.

And I am not sure if you were asking if anyone knew how to calculate the duty cycle as in were wanting to know how or just saying if they did know they could check it out themselves also.

Either way, you can get duty cycle by taking the injector pulsewidth in ms times rpm and divide that by 1200.

(ms x rpm)/1200= duty cycle

Example being 20.77ms at 5500 rpm is (20.77 x 5500)/1200= 96.06%

LOCO 05' E55

AFR Bung should be on your list! With the Iat's in the 150s you are pulling timing and should be dumping fuel so that would also affect your IDCs dramatically..

Check AFRs and i bet you anything you'll be in the high 10s

And hope timing is being pulled too...

GT-ER

My A/F ratio must not be lean even if it is at 100% IDC. My dyno showed high 11's on a single pull. On the street I'm sure it's trying to dump some fuel to lower combustion temps which may be why my IDC's are slightly higher in 3rd then they are in 2nd.

I know how to calculate them...I was just saying...lol. That's how I know that I'm at 100% at over 5,500rpms.

GT-ER

Yup, I was thinking the same thing.

How do my IAT's compare to others though? My car only goes above 150* at over 100-110mph.

Jakpro1

Timing looks great though. Jerry has that baby down. On the old engine blowing tunes we'd see spikes up to -25 before it was pulled. Noooooo!!!!!

Doesn't the obd blow!!??? Hope it's better and faster in the new twin turbys.

LOCO 05' E55

How high was it at the beginning of the pull? It looks about right for the cooling mods you have..

urbamworm

Since I don't have a logger I don't know but I had it logged on the dyno and they went to 176* in a 3rd gear dyno run and the car was dumping a **** ton of fuel making me run in the 10s a/f and power fell off hard. I have a EC heat exchanger, CM 30 pump and a separated cooling system but it is a little tank up front above my heat exchanger not a big rear mount.

I am sure it woudn't be quite as bad on the street with actual air flow but I know I still have a iat problem with the warm temps because you can feel the car pull well at lower speeds then fall off up around 100mph and up around those speeds around or over 100 is also where my A4 would pull away when racing them against each other. The A4 has meth injection which keeps the intake temps pretty consistent and the E55 needs meth injection bad, especially with the 180 pulley. I haven't got to drive the car in cold weather yet with this pulley so I can't wait to see the difference it makes with this pulley and having actual cool/cold weather.

_AMG_

Trunk tank would definitely help, along with methanol. My buddy was running meth on his 997TT and he was getting 50-70 IAT temps in 65 degree ambient temps.

GT-ER

Yup...my tune was the only tune Jerry put on my car. No dyno test or anything...just a canned tune.

obd does blowwww though.

About 105ish.

On the dyno my car would not dump fuel though. It would pull hard and clean to redline.

Yup...but injectors are apparently going to be my next mod for sure.

_AMG_

Nice!!
I've heard people making really good power with the TTM Injector kit + fuel rail, its worth looking into.

BenzoBoi

Dayam...now you got me thinkin that I should buy a data logger and see how she's running...

GT-ER

Yes sir....you may be surprised.

Velociabstract

DISCLAIMER, NO E55 (SRT-6 WITH EUROCHARGED TUNE)

IAT's look like mine. I see AFR's of 12 when cool, low 11's with 150º to 170º IAT's and low 10's when ECT's reach 240º. ECT's have a huge effect on AFR's. My boost keeps climbing with RPM, do you have some belt slip? I'm thinking water/meth injection is the best solution for me.

Les

GT-ER

I wouldn't even know if I had belt slip...my belt is only about 5k miles old.

shardul

iTrader: (1)

what are you using to DATA LOG?

320 dreamer

if your center piece is still installed look for black residue under the cover. sure sign of belt slip no matter how new it is

sneakyneon

Timing looks pretty good, that little bit thats being pulled at redline is normal, they all do that, it drops timing and closes the TB about 10% right before the shift

GT-ER

Autoenginuity