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Originally Posted by cody
Hi qksubi, I was wondering when sombody was going to ask me my rational. I think a road tune is better because A. The car is getting the proper airflow over the IC and radiator, and B. The tune should be fine tuned to real life driving, not rollers that simulate real life. There's nothing wrong with starting on the dyno, but the best best tune starts on the dyno and then is fine tuned on the track. Sadly, that would be cost prohibitive and this is the next best thing for me.
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You're aware that Ed road tuned Jeremy's Legacy, then later dyno tuned it and got 17 additional whp out of it because he was able to better monitor the car and he knew that the conditions under which he were tuning were the worst the car would see (IE: limited air flow, hot day, etc).
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Originally Posted by EJ20Legacy
The discrepancy in the numbers from the graph Dre just posted and the Mustang one is from tuning today. My first run on the Mustang was 260.3 and a couple of the road dyno runs I did with Ed made 260.x also. It was cold out when we first tuned so everything was extra conservative. I wanted to wait for a nice, hot day when the car would be as close as possible to knock to get aggressive with it and set more accurate temperature-based correction. The 17 hp came from pushing more timing and holding more boost to redline than before. It still never knocked once the entire time. There's more in it, but safe is good. It's not maxxed and that's cool with me. Almost all of that torque came from timing...
Boost was more of a pain in the butt on the dyno than on the street. It wasn't as consistent. Those fans just didn't do the trick.
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Originally Posted by EQ Tuning
As Jeremy pointed out, I did more tuning on the dyno because I was comfortable in knowing that the car was under the most extreme conditions it would see in real life, so I didn't have to worry about pushing it a bit further and then having the tune fall apart in worse conditions.
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Interesting.
http://www.i-club.com/forums/showthr...8&page=1&pp=50