IAT's

[AngryDog]

Seeing as how the ECU pulls timing at 35 degrees and above on the E55k, how many really pull full power for more than a few seconds? Even stock cars will pull timing.

Seems a little pointless to me?

 

[Alex]

Cooling was not E55’s strongest asset because power is usually somewhere towards the bottom on the list of priorities when MB designs cars. This is not completely pointless as only a tiny minority of AMG owners track their cars and need more than a few seconds WOT. The issue is not limited to the 55 platform. The first thing a 63 biturbo owner does after taking the delivery of his car is usually a map. Hardly anyone starts with cooling mods anymore, except maybe for Tony, who knows better and logged everything.

Running cooler is the key. Larger intakes & bigger pre rads and intercoolers is a good start if longer WOT runs is your thing.

 

[AngryDog]

Thanks Alex, I suppose that is a valid point I hadn't considered. I expect high cruising on the Autobahns will pass enough cooler air through the H/E to maintain lower timing retardation?

I prefer to sort the cooling first myself whenever possible. When I stepped up a level when I had my old Cossie I fitted a larger intercooler before the larger turbo went on.

I'd like to track and drag my E55 at some point, but I don't want to be losing all the power at the same time. I'd like to fit a larger H/E but the oil cooler is in the way.

Larger intakes, in terms of the intakes into the throttle body? I guess it is quite difficult to change the intercooler on the standard supercharger?

 

[Celicasaur]

Interesting.

How many degree's does it pull and at what increments thereafter?

For instance, is it 2 degree's at 35-40 and then 4 degree's at 40-50 or something?

 

[AngryDog]

35 degrees c is 3.5 degrees retardation
45 degrees c is 6.3
65 is 9.5

These are approximate figures.

 

[Alex]

Thanks Alex, I suppose that is a valid point I hadn't considered. I expect high cruising on the Autobahns will pass enough cooler air through the H/E to maintain lower timing retardation?

I prefer to sort the cooling first myself whenever possible. When I stepped up a level when I had my old Cossie I fitted a larger intercooler before the larger turbo went on.

I'd like to track and drag my E55 at some point, but I don't want to be losing all the power at the same time. I'd like to fit a larger H/E but the oil cooler is in the way.

Larger intakes, in terms of the intakes into the throttle body? I guess it is quite difficult to change the intercooler on the standard supercharger?

Yep, bigger intake pipes help lower the IATs. On the standard supercharger, I would go with top mounted intercoolers like in SLR McLaren. This would not only allow for a larger surface area, getting the core out of the hot valley will help it run more efficiently too. Not a cheap mod unless you can do it yourself.

 

[AngryDog]

Yep, bigger intake pipes help lower the IATs. On the standard supercharger, I would go with top mounted intercoolers like in SLR McLaren. This would not only allow for a larger surface area, getting the core out of the hot valley will help it run more efficiently too. Not a cheap mod unless you can do it yourself.

Yeah all very expensive and quite tricky to do. I have a standard TB but I do have an intake kit that I can re-fit to the car but the pipe work will remain the same size. I think other than given more s/c whine it is of little benefit lol.

With your build could you have relocated the intercooler?

 

[Alex]

Yeah all very expensive and quite tricky to do. I have a standard TB but I do have an intake kit that I can re-fit to the car but the pipe work will remain the same size. I think other than given more s/c whine it is of little benefit lol.

With your build could you have relocated the intercooler?

Not impossible to relocate but would require dropping the suppercharger further down the V of the engine and flipping it upside down. Whether I do it or not will depend on effectiveness of my current setup.

 

[Gbrowncls55]

At some point does it not stop pulling the timing and disengage the supercharger clutch instead? Mine does it after three or four of up to 6000 rpm wot runs.

 

[SMed08]

Correct, can't remember at which temp it does that, but it's hot.

You need to probably replace your intercooler pump. It should not be getting that hot.

 

[AngryDog]

85 degree's c iirc.

The WOT runs that you do, are they 6k in top gear?

 

[Gbrowncls55]

Err no! 2nd and 3rd. They are limited to 155 so wouldn't pull 6k in top anyway.
I have a new Bosch 10 ready to go on.

 

[benlucas]

Just replaced my I/C pump with a Bosch 10 ( a pretty straightforward job btw.) Definitely worth it - no more s/c disengaging nonsense