E55 Dyno result
12-18-2006, 03:10 PM
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2004 C32 AMG
12-18-2006, 06:29 PM
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Interesting dyno plot. Let's talk numbers. Your HP/Torque numbers are corrected to the current SAE standard, which is going to make your values a little lower than most of the other plots on this forum, which are corrected to the STD standard. For comparison, if your numbers are corrected to STD, your HP would be right at 400, which is about 10 HP short of the average dyno pull for a stock car. But, since your pull was done in 4th gear and is stopped prematurely by the speed limiter, you're not really seeing the actual max HP, which occurs at 6100 RPM. I would guess that your car would be near the average - 410 HP. Your torque w/STD corrections would be about 450 lb-ft.
The 22% crank correction factor they used is a little aggressive - I think 18-19% is a little more realistic. If you apply 22% to 410 WHP, you get 526 HP at the crank. Using 19% gives you 506 HP. To verify, take the car to the track with similar atmospheric conditions. Looking at trap speed, 526 HP would result in 116-117 mph, 506 HP would give you 114-115 mph. These values are based on STD corrected HP.
That rise in your plot at 3500 RPM is a bit unusual for an E55. I doubt that it's caused by tire/belt slippage - the curve is too smooth. Without data logging, it's hard to determine what's going on, but I suspect that it may be caused by a load limit imposed in the ECU - could be boost and/or timing related. MB may be trying to keep cylinder pressure down in the RPM range where detonation would be prevalent. Dunno, but it's interesting.
The 22% crank correction factor they used is a little aggressive - I think 18-19% is a little more realistic. If you apply 22% to 410 WHP, you get 526 HP at the crank. Using 19% gives you 506 HP. To verify, take the car to the track with similar atmospheric conditions. Looking at trap speed, 526 HP would result in 116-117 mph, 506 HP would give you 114-115 mph. These values are based on STD corrected HP.
That rise in your plot at 3500 RPM is a bit unusual for an E55. I doubt that it's caused by tire/belt slippage - the curve is too smooth. Without data logging, it's hard to determine what's going on, but I suspect that it may be caused by a load limit imposed in the ECU - could be boost and/or timing related. MB may be trying to keep cylinder pressure down in the RPM range where detonation would be prevalent. Dunno, but it's interesting.
12-18-2006, 06:37 PM
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2004 E55
I would not be surprised to say that it's because the A/F ratio stops going "south" for a few hundred RPM's at that rpm. Where the A/F Ratio leveled off is about the same time you see the HP jump a little bit???
To me the A/F is way rich up top.....definitely some Hp to be had with proper tuning.
12-18-2006, 06:53 PM
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Ken,
No, I don't think so. I looked at that and saw no correlation. If you look at the values in the chart, you'll see the HP jump quickly, but the A/F numbers don't - they're too smooth by comparison. Plus, if it were due to A/F ratio, the power curves would react more gradually, not a step rise.
No, I don't think so. I looked at that and saw no correlation. If you look at the values in the chart, you'll see the HP jump quickly, but the A/F numbers don't - they're too smooth by comparison. Plus, if it were due to A/F ratio, the power curves would react more gradually, not a step rise.
12-18-2006, 07:11 PM
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2004 E55
Ken,
No, I don't think so. I looked at that and saw no correlation. If you look at the values in the chart, you'll see the HP jump quickly, but the A/F numbers don't - they're too smooth by comparison. Plus, if it were due to A/F ratio, the power curves would react more gradually, not a step rise.
No, I don't think so. I looked at that and saw no correlation. If you look at the values in the chart, you'll see the HP jump quickly, but the A/F numbers don't - they're too smooth by comparison. Plus, if it were due to A/F ratio, the power curves would react more gradually, not a step rise.
