codayce:
Allot of the reason my power kept climbing is mostly due to the e85 and how I can safely keep throwing timing at it even at higher rpms. Im running 35* in the upper right of my timing map! Most gas sr's will not respond well to lots of timing up top and you are cut off on timing kinda early on gas sr's. I remember a dyno graph from australia (I may even be able to find it) where a fellow was running a stock t25 on a e85 sr and was making around 250 DD whp. The graph was SICK!
I also tend to think that there is an added theoretical compression. Im running an actual air fuel ratio of 8:1 under boost, so there is much less room for air in the cylinder than if I were running gas and at a 12:1 afr. Also, most of the fuel is now a high energy vapor that mixes well with the air. When it sprays into the IM and head it vaporizes allowing it to mix better.
Quote:
Originally Posted by HemiCharger
one thing you also have to consider is you are dyno tuning these cars for power. I did the same thing when I tuned mine but my tuner also hopped in the car and street tuned it with me making full 4th gear pulls to get the most out of it. It smoothed a lot of things out that could not be seen or done on the dyno. Additionally, why I like the Power FC is it will tell you when you go into dangerous knock and will pull timing a little so you do not go BOOM.
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What dyno were you tuning on? A DD will allow you to simulate any street condition. It also allows you go hold it at any rpm you want. DD is the best tool for tuning period.
And the knock sensor on a pfc is not a high quality listening device either. Stock ecu tuning allows for the same exact feature, Its just most of us turn it off.