General > Shows, Events and Meets
JKM Dyno-Day - 2nd March....
R-tech-Nick:
--- Quote from: Hurdy on March 06, 2013, 10:35:09 am ---
--- Quote from: R-tech-Nick on March 06, 2013, 08:33:54 am ---Lol the usual 1% accuracy because we tune race cars quote...... No such thing dude, the closest word u can say to accurate is "realistic". There is not one chassis dyno in the land which is accurate are there are so many factors to take into account, one being correction factors applied the the readings based on atmospheric conditions, there are around 6 factors which can be used which on a 200bhp run can vary the power between 7bhp -/+.
--- End quote ---
In that case there must be a particularly nasty adverse conditions vortex surrounding JKM's dyno where all the negative forces come together to create the "Low" dyno. On the 2nd of March there must have been "Perfect Storm" conditions. LOL
:signLOL:
--- End quote ---
Only way to find out what is going in on is log the cars on the dyno.. MAF LOAD AIT TIMING ect..
I am saying the factors are..
Coolant temp a variation 98deg+ will make ecu reduce power up 40% reduction
AIR intake temp anything over 40deg+ will make ecu reduce power 40% reduction
Correction factors for atmos
cold bearing and drive train temps on the DD rollers will give a lower reading on the est hp
Fuel quality
E30Dom:
--- Quote from: R-tech-Nick on March 06, 2013, 01:04:25 pm ---
cold bearing and drive train temps on the DD rollers will give a lower reading on the est hp
--- End quote ---
Interesting one, JKMs is in a outdoors 'shed' at it was a very cold night/morning...
I think its still down to loading/strapping down etc...
flashp:
JKM's dyno is repeatable.
The most important element of any calibration/measurement is a repeatable and reproducible measurement so monitor your vehicles on one dyno only, then you'll be able to track changes with success.
If you keep changing the measurement device looking for the most favorable figures you won't know where you are.
RedRobin:
--- Quote from: flashp on March 06, 2013, 01:45:57 pm ---
JKM's dyno is repeatable.
The most important element of any calibration/measurement is a repeatable and reproducible measurement so monitor your vehicles on one dyno only, then you'll be able to track changes with success.
If you keep changing the measurement device looking for the most favorable figures you won't know where you are.
--- End quote ---
....Which is exactly why I only put my car on one dyno: JKM's DD :happy2:
RedRobin:
^ The AFR (Air Fuel) may need checking using logging, although the runs showed how the ECU 'recovered' the irregularity.
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