Help with disappointing Dyno results - E55k

[Ginger55k]

the transmission loss is 37%; 450bhp to 282

Funnily enough a bit like a V8 without an SC and very hot.

 

[kalvin928]

Hi Andy had mine done at S2 Smarts


First pull was 527.3 hp and 659.4 ft-lb torque
Second pull 507.3 hp and 729.5 ft-lb torque!!!!

Will be tempted to further mods done neat year... torque was amazing!!

 

[Ginger55k]

Hi Mat B,

I am sure there is nothing wrong with your car and this is down to the environment you describe.

The 55k engines weakness has always been its cooling system, I say that only if you mod/track or you have a duff pump.

You state you have a new pump so lets discount that.

As the IAT increase the ECU will gradually retard the timing and dump fuel to cool the engine, at a determined point the supercharger clutch will disengage to safegaurd the engine.

This is i believe what has happened on the dyno to your car.(very high ambient air temps in garage)

Because you have an upgraded pully this increase in IAT is even more than a standard pully.

Bet if you went out for a drive now it would pull like a train.

Just changing a pump is not enough for serious modders, charge cooler, split system, front or rear mounted tanks, Killer Chiller, meth injection these are all mods for serious cooling.

Give Olly a shout at PCS should you need to discuss.

 

[mattc]

Could/do dyno places not put a rather powerful fan in front of the vehicle to mimic air flow?

 

[Ginger55k]

Could/do dyno places not put a rather powerful fan in front of the vehicle to mimic air flow?

Yes they should and do, but Mat B describes it as so hot in there he had to go outside, plus multiple runs on the car.

I have experienced this happen to mine after a few WOT the supercharger disengage, plus lots of problems of cars with duff pumps at the last couple of Eurocharged events means owners do not realise the pump is dead or poorly performing.

Still think it was the environment.

 

[SavMan]

Who fitted your pump?

 

[Ginger55k]

Who fitted your pump?

Now that is a good question, if its not been fitted correctly or hasn't been vented/purged of all air in the system it could under extreme loads give the same symptoms.

 

[SavMan]

A Maha dyno calculates the drag automatically hence the green line on the graph I think but not 100% but you may need to calculate the correction factor for conditions into that so the drivetrain loss would be less than the 168 on the graph.

The power stop very early you should be closer to 5800rpm at the very least. Then look at your IAT's which are high but not crazy to shut off the supercharger so your pump must be working, it will however pull timing and add fuel. At 65c it will pull 9 deg so depending on what remap you have you are probably at single digits.

Initial thoughts are you either have air in the system or a blockage, the stock heat exchanger is the most likely culprit for a blockage. Best thing to do is log some data on the road to see what your IAT's are doing.

 

[SavMan]

Hi Andy had mine done at S2 Smarts


First pull was 527.3 hp and 659.4 ft-lb torque
Second pull 507.3 hp and 729.5 ft-lb torque!!!!

Will be tempted to further mods done neat year... torque was amazing!!

Those numbers dont add up?? What mods do you have is it a crank and supercharger pulley?

 

[Ginger55k]

I honestly thought timing was pulled at 35c and then incrementally as it gets hotter up to 65c and SC shutoff, thats why the boys on the other side of the pond in hot climates are so mad on kc and meth as they are pulling timing rolling off the drive.

Mat B's chart is showing 70c IAT

 

[Ginger55k]

Found this regarding timing/temps

 

[SavMan]

Found this regarding timing/temps

Correct but shut off occurs at >85c

Considering the ambient temp was +25C having a 45C increase on a 3rd gear pull is high but not exceptional which would suggest the pump is doing something ideally you want to try to keep it below the 65C level with close to stock cooling.

 

[Ginger55k]

Correct but shut off occurs at 90c

Considering the ambient temp was +25C having a 45C increase on a 3rd gear pull is high but not exceptional which would suggest the pump is doing something ideally you want to try to keep it below the 65C level with close to stock cooling.

Cheers SavMan, you know more about these engines than I, didnt know it was 90c for shut off, something I have experienced as I tried looking really casual out the window as a Saxo overtook me

 

[SavMan]

Cheers SavMan, you know more about these engines than I, didnt know it was 90c for shut off, something I have experienced as I tried looking really casual out the window as a Saxo overtook me

It is actually 85C, sorry my mistake I must have been editing while you were typing the response.

 

[Ginger55k]

I still look at the figures given +35c +45c as being actual temperatures that the ECU is reading, it doesn't make sense if your adding the ambient air temp value to these readings?, so if it was an ambient air temp of 50c that would start timing retardation at +85c, confused as to how the ecu can protect the car in a very hot country.

 

[Mat B]

Many thanks for all your replies

Here a quick you tube vid of the end of a run. I didnt get a good video as it was that hot and noisy in there (god i feel old)
You can see the fan in the right hand side of the shot. It is not being used.

W211 e55 dyno run - YouTube

My pump was fitted by my local specialist, Autoclass in milton keynes. The previous one had all but failed. I could accelerate once before it would shut off the supercharger.

i totally missed this chart i got with the dyno read out. It shows it only revved up to 5400 and it was peaking at 1.77 bar. How does this fair to standard?



Uploaded with ImageShack.us

I am a little more reassured nothing major is wrong and it would perhaps record a better result on another Dyno.

I definitely now need to sort my cooling out before i try again. A good weekend of researching and i shall take the plunge

 

[Dieselman]

Just go and time some acceleration runs and compare to standard. That way you know what percentage of additional useable power you have.

 

[SavMan]

Many thanks for all your replies

Here a quick you tube vid of the end of a run. I didnt get a good video as it was that hot and noisy in there (god i feel old)
You can see the fan in the right hand side of the shot. It is not being used.

W211 e55 dyno run - YouTube

My pump was fitted by my local specialist, Autoclass in milton keynes. The previous one had all but failed. I could accelerate once before it would shut off the supercharger.

i totally missed this chart i got with the dyno read out. It shows it only revved up to 5400 and it was peaking at 1.77 bar. How does this fair to standard?



Uploaded with ImageShack.us

I am a little more reassured nothing major is wrong and it would perhaps record a better result on another Dyno.

I definitely now need to sort my cooling out before i try again. A good weekend of researching and i shall take the plunge

Boost is on the lower side of acceptable, looking at the speed what gear did they do the runs in. It does not look like a 3rd gear pull which could also account for the increased IAT's, the IAT's climb nice and steady though.
It's also worth getting AFR's on a dyno run.

 

[SavMan]

I still look at the figures given +35c +45c as being actual temperatures that the ECU is reading, it doesn't make sense if your adding the ambient air temp value to these readings?, so if it was an ambient air temp of 50c that would start timing retardation at +85c, confused as to how the ecu can protect the car in a very hot country.

I was referring to the increase above ambient, if you look at the data just posted my Mat B his IAT temperature starts at 37C which is spot on at 12C above the ambient air being pulled in.

 

[BFT]

What size fan was on the dyno? It is crucial for getting IAT's low....

The mapping must be right on these and I would like to see an AFR plot if there is one with the dyno?

It will likely be worth before you start panicking trying another dyno?