I finally got a baseline dyno done on my 06 E55 Wagon. I had it done on a Dyno Dynamics since there is one local to me and the owner is willing to give me a good deal on pulls and work with me.

I did four runs, ambient conditions today were around 55 degrees (not sure about humidity). The graphs show uncorrected numbers.

The car is bone stock and runs were done in dyno mode.

Run 1: fourth gear, hit speed limiter
Run 2: third gear, car was a bit heat soaked from the first run

... took a break here and installed K&N drop in filters for the hell of it since I had them on me.

Run 3/4: third gear with K&N drop in filters

The HP numbers are low, but the owner says that the dyno manufacturer claims DD numbers are typically around 12% lower than dynojet, which would put peak hp up around 412, which is fairly average I guess if not still a bit low.

Also it looks like the K&N drop-ins actually gained some power, but then again I don't know how much of that was due to the car cooling down while I took the time to install them before run 3 and 4. I'm not really looking to conclude anything from this, I was really just trying to get a baseline before doing the pulley and ECU as the next step.

The other oddity is that the hp curve is shifted to the left, with peak hp around 4800-5000 instead of 6000-6200 where I normally see it for this motor. Not sure if that has something to do with this type of Dyno or if it's just a heak soak or ECU fuel dumping/pulling timing issue ...

Anyway, it's just a baseline for my purposes only, but I thought people might be interested. It's definitely running disgustingly rich above 4-5K RPMs ...

hp+torque graph:



torque+a/f graph:

 

Sounds like pump.

 

Yeah I have a new one ready to go ... I wanted to get something that could log IATs before installing it though to see if they go down.

 

I cant believe how rich the stock runs. AFRs go under 11.0:1 at 3000rpm and are even richer than 10.0:1. A lot of power is left on the table just from a proper tune.

 

I agree. I think it's an environmental imperative that I stop wasting all of that power

 

WTH happened w/ the tq curves at 3200-3400RPM? Why are there quite significant dips?

Also, what happens w/ HP curves also right before they hit rev limiter? Never seen a dip like that.... belt slipping?

 

good questions ... on the tq dip I really don't know, it almost looks like the hesitation that I've complained about on other threads. On the hp drop, I don't know if that's a heat issue (and therefore ECU dumping fuel/pulling timing), belt slipping, a result of using this type of dyno, or something else. My first guess would be heat.

 

I don't think it's the heat issue.... 'coz if it is, why would the curves go back up after a split second? Did the heat just dissipate that quickly and the ECU went back to normal mode?

Also quite interesting to see that the tq curve didn't have any dip on 3rd run (1st run after you put K&N in and/or cooled the car down).

My guess would be belt slipping... I'd suggest you bring your dyno charts to a reputable expert and get some opinions (or hopefully some experts here like Vadim would chime in)... I'd also suggest you put your ECU+pulley on hold... at least until you understand what the problems are (if indeed they are problems) and see whether you need to fix them under warranty.

 

Is there any way to tell visually if the belt is slipping? Some sort of wear on the belt or pulleys?

My plan right now is to take it to a local shop to install the Johnson CM-30 pump and look for any other issues then re-dyno, possibly on a dynojet for better comparison with everyone else here.