Has anyone taken their car to the dyno to campare? I hear ill gain about 10 more wheel hp over a hand held tune. Is their any truth to this.

 

Not necessarily. You have to remember a dyno is just a tool to be used to measure a car's power. You can have 5 to 10 rwhp difference between different dyno's on same car, or even same dyno, same car and different days.

Most important part is, how does the car drive and feel? Dyno tunes are generally more accurate as it's tuned while ON the dyno but unless you are running a massive n/a h/c/i setup or boosted applicated, quality email tune would be fine. Running h/c/i or boost I would def suggest a quality dyno tune.

 

I don't have a dyno tune, the same car, or a set up like yours but what I can say is I wonder these things myself because I just installed a JLT CAI and a 93 Lund tune. I want to take it to a dyno and run it for two reason, one to see how much power I'm making and two to see what the air to fuel ratio is. Now is the tricky part and I have heard of it but I know some dyno guys will see a guy like me who loves his car and they will set it up to read weak and to get the AF ratio off so I will pay them to tune the car, so it might run me an extra 80 bucks but I think I'm gonna try and visit two different dyno facilities for the AF ratio. I could really care less what the readout says, if the AF ratio is good I know I'm making right around 420whp.

 

dyno tricks are common for Harley motorcycles. Dont know about car shops.