Hi all

I have a CL55, but I figured I would get more views over here. Same engine as you guys too.

I have a 180mm EC crank pulley, EC intercooler, new charge cooler pump and a EC map on my CL55.

Due to issues with the tuner that I used in the UK, they didn't do a dyno run, so this is the first time I have an opportunity to get it on one since the tuning. As I'm in the middle of complaints with then, I am reluctant to go back and get them to fix the problem.

My results where a bit sad:



The dyno operator said two things:

1. You would be dynoing 580-590 all day with those mods and
2. Your running very rich.

I have to agree. With an AFR 10.4:1 at the top end, something isn't right.
I have a boost pressure gauge inside the car, and he said he never saw it go above 13psi. With a 180mm crank pulley, I should be running around 14.8psi.

I have a new belt and new SC belt tensioner. I have not heard of the crank pulley, standard upper pulley combo slipping, but you never know?

He thinks its the map, I think There is boost loss somewhere.

Do I look at a) the map b) the SC belt or c) another source of boost loss.

I will be logging my boost pressure soon and will post up the results, I suspect to see it start dropping around 3500rpm.

Thanks all!

 

Short answer is as you said this is the first time on a dyno. So that means you have "can tune". So it will be conservative as all cars are diff no matter what. So I would suggest a dyno tune with them making corrections remotely or you install logging equipment and log on the street and swap info so adjustments can be made. You likely are leaving power on the table but all the above considered I would say it was a good safe tune.

Also type of dyno makes a diff. Does this dyno operator get many 55K cars to know they should that high on his dyno? If not he is just throwing **** out there. My numbers are below and you can see I am heavily modified and don't hit 544 but that's bc of a diff dyno type. But for that dyno I am at a good spot.

 

Possibly, I would agree with you but the 2 issues that are outstanding is that the car isn't making the boost it should and the AFR is wayyy to rich. I understand its safe, but its too rich.

So a) what is the reason its not making the correct boost, and b) is the reason for the rich running, due to boost loss or a map commanding too much fuel

I agree that the car should be dyno tuned to get the most of the components added, but I would be expecting 520-530 with a smaller supercharger pulley, I think there is is a bigger issue at play.

As you say, I need to log some information in 3rd and 4th (PSI vs RPM) and see what they show. A boost leak will be obvious if my boost is bouncing around all over the place.

 

For a canned tune, that AFR looks nice. You are focusing on the very top end only, but without providing IAT's, it could be argued that the car dumps fuel because of high charge temp.

You run the risk of tuning perceived richness out, that is going to bite you in the ***, when the weather gets colder, and suddenly you run lean on top.
(I'm not saying this is the case, I'm saying it might be the case)

Is the 544hp back calculated crank HP? sounds about right to me. if it is WHP, then ****. With just a pulley?

 

If you look at 3500rpm onwards, you can see my AFR flatline, I would prefer a 11.5 AFR.

Also, Boost isn't where it should be with a 180mm crank pulley. Is this due to a boost leak or belt slip?

544hp is calculated crank. With a 180mm crank pulley I would be expecting more. The tuner at the dyno shop also said you should be repeatedly running 580-590 on this dyno with those mods. He is well respected in the Mercedes tuning area around here.

I was monitoring intake air temps, it never went above 40 deg c - 100 Fahrenheit. It was approx 60 degrees F today.

 

544 at the flywheel doesn't seem far off the mark with a 180 pulley and tune. These motors can vary substantially in their baseline power. I'd be interested to see if a belt wrap sorted it for you?

 

True. Im going to log boost vs psi and see what it looks like. I think it will be obvious if something isn't right.

If it shows an issue I will install a belt wrap kit firstly. Then check the gaskets etc between surge tanks and inlet.

 

In my opinion, there is probably a low probability of leaking charge between the surge tanks and intake runner below.

 

I have an 06 CL55 with: EC clutched blower pulley, EC "can" tune, EC i/c, BeltWrap, and K&N air filters. Runs very strong during cold/cool NY weather. Estimating 560+ chp. Noticed a slight drop in power during 70 degree days. Next: separating the cooling and headers.
Alexander, BeltWrap it...you'll definitely eliminate any suspect of slippage.

 

Definitely, I tried to log boost on the road but its too dangerous.

I have my BWK on its way, and I will be tapping the surge tanks tomorrow. Once installed, I Will go back to the dyno, and they will be able to plot boost vs rpm.

 

All the above work done and the car is still the same.

So additional work done:

New surge tank gaskets
BWK
New SC belt
Surge tank tapped for boost reading.
1 step colder plugs

I think the boost is being bled back by the SC bypass valve rather than leaking from the system in the first place. I have cleaned my engine covers since the belt wrap kit and I am not getting any belt slippage as before. Same results, engine feels like the dyno graph, powerful midrange but flat after 3500rpm.

I monitor boost while driving with an ultra gauge and rarely see 12.5psi+ at high rpms.

I have had confirmation that an AFR of 12.5:1 is aimed for on this map, so anything less than that and the car is dumping fuel or bleeding boost for some reason.

I think it needs a real-time mapping session as others have said. Not really anywhere else to go as I haven't had much support from the tuners who carried out the modifications unfortunately.

 

Who did the tuning and who is putting it on the rr now? I'm from the uk also and know who I would be taking it to....

 

EC UK and Surrey rolling road.

 

A 180 crank pulley will add 80- 100 hp. Your in that range really if your looking for 580 you should need more mods. Get the air fuel right and you may pick up 20hp

 

I have a 77mm clutched sc pulley (equivalent to 180mm cp) and at 1000-1500 elevation I max out at 12.2 psi. Not sure the target should be 12.5 seems too lean and I wouldn't feel comfortable. You need to log or get dyno tuned.

 

We are basically at sea level and I am definitely not on the lean side with my afr's!

 

I'm saying your 12.5 target seems too lean.

 

Do you mean that at 12.5psi I will be too lean?

Sc calculations with stock upper and 180 crank show 14.6psi, so if the map is setup for that, it's going to be rich on anything under that.

 

No. You said you have confirmation that the target afr is 12.5 for this tune. I'm saying that 12.5 afr seems lean to me for a boosted car.

 

Oh right! Don't know, I can only go based on what Jerry told me

 

Rocman, do you have a BWK on your pulley setup?

 

11.5 seems ideal for most.

 

Yes I have belt wrap kit installed. Stock most I would see was 9.2 psi. After headers 8.5 psi. Then after 82mm tb and 77mm sc pulley 12.2 psi. No boost leak and no belt slip.

 

Cool thanks, just interested to see what my boost level will go up to when my 77mm goes on after full exhaust install at the same time. Stock I was 7.8psi and after installing 84mm clutched sc pulley and BWK I am at 8.7psi peak. This is at 5000ft elevation.. Apologies to the OP, don't mean to hijack your thread Sir

 

To OP I think you definitely need to get some dyno time in and get your fueling right. Once that's good to go then the rest can be looked at if need be. At least it will be the perfect mixture for your setup and elevation etc.