Tune Timing on the street...comments?

[Johnny_9]

So what about street tuning? can anything be done on the street?

The answer is yes, you can get the low load ign in the ballpark on the street but you'll need a buddy to drive while you tune on a level stretch of road.

Here's how: select a gear and a speed to get you into the desired RPM column. For example 3rd gear 50MPH then monitor intake air and record how much intake air is required to achieve this speed. Have driver target the 50MPH speed then increase ignition by 2 deg and speed will most likely increase slightly if it does not increase ign again by 2 deg. When speed increases above the target have driver back off on throttle till 50mpg is achieved again. Then record new air flow and repeat till you find sweet spot. The idea here is a little different than on the dyno, here you are finding the least amount of intake air (= minimize MAP) required to achieve a given speed.


Once you understand this process simply select different speeds and different gears to target different columns in the PT IGN table. You won't be able to tune the PT hi-load section of the table this way but you can certainly tune most if not all of the lo-load sections of the table. Don't try to force tune a section of the table using this procedure, simply target a speed and a gear to achieve an RPM then let the chips fall as they may. Meaning just tune whatever cell the car wishes to be in for the given condition, then you can simply interpolate the cells you may not have hit.

[yangeghatch]

Sounds good. I might give that a try.