Quote:
Originally Posted by Alpine Whiteboy
I think Dinan shows what their numbers are on race fuel. thats why your numbers are so far off. I could be wrong but i swear i've read that somewhere...
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Dinan uses 93 octane in all of their dyno tests. No idea where you got that info on race fuel from. You can find out more information than anyone needs to ever know about dyno testing and how Dinan does it at
http://www.dinancars.com/university/ and then click on the "Dynamometer Testing and The Modern BMW Engine" link. They use a chassis dyno that bolts directly to the wheel hub to get the most accurate dyno numbers possible. There's no better way to measure it accurately. They also use fans that flow 38,000 cfm of air flow @ 75 MPH. That's a lot of air. The fans are normally used in high rise ventilation systems. Go to 4:15 seconds in this video and see what I mean... http://www.youtube.com/watch?v=FM0XrRR3EzU
Quote:
Originally Posted by My2Cents
Not sure if there is a way to check. BMW just flashed my computer due to the HPFP recall. I will be going in to get Dinan software re-flashed. I will talk to them about my dyno results and make sure they flash stage 2 software. I might dyno my car again afterwards just to see if that was maybe the issue.
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It's extremely possible that your HPFP/injectors/DME OEM software/Low pressure fuel sensor was faulty/failing and contributed to your low #'s. I'm assuming your car has the required factory oil cooler for the stage II Dinan tune? Not all N54's have them, just in case you/your dealer hadn't noticed that yet.