Quote:
Originally Posted by Nardi330
was great to see how your canned tune performed on par if not out performed some local dyno tuned cars here.
there have been some heated discussion before and you can't argue with facts/proven results. some of those people have gone quiet now.
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Tunes that were developed on a dyno often fall prey to air contamination issues. This is because most dyno shops don't have adequate fresh air circulation. So you end up with dirty air after long tuning sessions. The inert exhaust contaminates the air which feeds the engine. So you effectively get a volumetric efficiency drop which, if gone unnoticed, the tuner will unknowingly calibrate for. But then in the real world (clean fresh air), the dyno tuned engine will now run leaner with over-advance. Both of which will result in power loss. I'm not saying this is the issue with the dyno tuned cars you saw at the dyno day. But it is a common issue I've seen over the years. I've fell victim to it several times myself!
Cheers,
shiv