went to the dyno today....
#49
I've dyno'ed quite a few rising rate setups where the injectors would lock open, or at least that is the only explanation that I could come up with. Going 40+ or 40- on an AFC would have absolutely no effect on the AFs. The ECU might be calling for 5% or 85% duty cycle but the injectors where at the mercy of the fuel pressure.
I've taken 330cc injectors to 240whp on a regular 1:1 setup, so 290-ish isn't hard to swallow.
I've taken 330cc injectors to 240whp on a regular 1:1 setup, so 290-ish isn't hard to swallow.
#50
I'm going to preface this comment with the following: I've been out of the tuning thing for a few years so my experiences are a little out of date.
This is something that I did years ago taking advantage of knowing multiple people that ran dynoshops, I'm a little hazy on the exact figures but the trend is more relevant. We dyno'ed a car on an in ground dynojet and drove over to a shop with a Mustang dyno. From what we saw the Mustang dyno came up with numbers 15% lower, or whatever the hell the amount was, but when we ran the Mustang in its so called dynojet emulation mode it made almost the exact amount MORE than the dynojet. And then we headed BACK to the dynojet and backed up the earlier figures with about a 1% deviation.
My only point to this is to say that dynos with user accessible variables produce plots that are only useful in comparison to other graphs to whatever degree that you trust the source. And I'm not limiting that statement to other types even. An unscrupulous tuner could monkey round with settings from one run to the next to bilk a customer.
This is something that I did years ago taking advantage of knowing multiple people that ran dynoshops, I'm a little hazy on the exact figures but the trend is more relevant. We dyno'ed a car on an in ground dynojet and drove over to a shop with a Mustang dyno. From what we saw the Mustang dyno came up with numbers 15% lower, or whatever the hell the amount was, but when we ran the Mustang in its so called dynojet emulation mode it made almost the exact amount MORE than the dynojet. And then we headed BACK to the dynojet and backed up the earlier figures with about a 1% deviation.
My only point to this is to say that dynos with user accessible variables produce plots that are only useful in comparison to other graphs to whatever degree that you trust the source. And I'm not limiting that statement to other types even. An unscrupulous tuner could monkey round with settings from one run to the next to bilk a customer.
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09-23-2015 12:26 PM