Posted 04 June 2014 - 11:25 AM
How necessary is a dyno in the tuning process? Can you really get an email tune that will work with a car, sight unseen? Are all cars the same that one tune will work on every 2010 GT500? Is the dyno just for dialing in those last 5rwhp?
Is it as easy as saying, "I've got a 2.6 pulley, x pipe, and intake. Give me a tune for 91 and 93 octane." I get a file emailed to me, load it into the SCT, and then flash the car?
Only a dyno can get you the data you need to make a proper tune since in the end, it is all about establishing the right power curve and air/fuel ratio and getting all of those to intercept. If you buy a canned tune, it was developed on a dyno.
I don't consider dynos to be very repeatable. I see power curves of sequential runs where the last is bigger than the first. That car didn't make new HP since due to heat soak it will usually be less. Most likely the uncertainty in the instrument gave it more. Runs on spearate days are subject to differences in weather (temperature, humidity). This is the problem with most "before and after" runs.
In essence when I look at dyno sheets as long as the consecutive runs are close and of the same general shape just average them. I look more for anomolies in dyno curves where the A/F ratio might go through a bad table transition.
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