Where's the trade off?

[98spydert]

There's lots of trade offs when tuning for pump gas and the best performance for daily highway smashing... I could pick 20psi at 12.5:1 and control the knock counts with timing... or I could pick 20psi at a richer air:fuel and higher timing... or 18psi or lower with less fuel and more timing... (all just random examples)

When you're tip toeing around a couple PSI or couple degree's timing or a couple % fuel, where's the most power usually? This is where dyno tuning comes in handy but as far as street tuning, what is best?

 

[98spydert]

Wisemen maybe?

 

[cagri]

I believe boost makes the most power, it is better to run more boost than more timing. You will make more power by running higher boost and low timinging(for safety) and for pump gas richer A/F ratio(for safety) than lower boost and higher timing. From my experince A/F ratio does not matter that much when it comes to power(compared to boost), unless you are running pig rich.

 

[oddrob]

A/F ratio has a great effect on power. I can pick up 40-50 hp on a car with an AFC depending on mods. Most of the cars run rich in general for safety purposes. Best bet is spend some time on a dyno and see what helps your particular setup the best.

 

[98spydert]

I haven't been able to tune timing w/ DSMLink so my experience is limited to adjudting boost and fuel, I also think a/f has a huge effect on power output. My example is at 18psi I could run 4% leaner than 20psi for a 0 knock count and 18psi "felt" considerably stronger, sounded better and rapped through the gears a lot quicker. I'm running fairly high timing at ~22 at WOT. So maybe I should look to take a little timing out in order to run a slightly leaner mixture?