If you would like to understand how to tune search on google how to tune nitro engine. and just browse threw a few sites and do some reading trust me its worth it. I'm by far not an expert on tuning but when i first got into nitro i read as much as i could about tuning nitro motors and I've never really had a problem with it
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or well shall i say if you would like to better understand tuning and the reasons behind the pinch test but remember the pinch test is just a ball park setting it will still take some fine tuning