John Laidlaw
Senior Member
- Joined
- Nov 15, 2013
- Messages
- 26,373
- Reaction score
- 9,163
- Location
- Wirral
- Your Mercedes
- Land Rover Discovery 4
Exactly this AlexDyno numbers are only to be used a tool IMO.
The only way that tool is useful is to measure the change before and after.
Trying to extrapolate performance numbers is difficult, as there are many different variables, the way the dyno measures power, back calculated losses, correction factors, ambient conditions, heatsoak etc.
Some different dyno manufactures read up to 50hp off from each other. So it should be used to compare absolute differences.
Bottom line is, if the car feels faster than it did before, then the map is doing its job. Whether the car was down on power in the first place is another question, but I would be inclined to think that if it was down on power, a map wouldn't "fix it". (boost leak etc). Essentially, the "low power" may come down to just inaccurate dyno measurement.
Case: Last year I had the 63 Dyno’d locally - 560 bhp and I could see they were struggling to get the power down. Didn’t have any work done
This year as you know- trip to MSL...my above post didn’t tell the ‘true’ story. Before the remap it was Dyno’d at 582 bhp stock, after 684 bhp....2 different dynos 22 bhp difference. OK some might be due to the particular fuel I had in blah blah, but I agree with your comments