BLK01S4

strip tune .. now were talkin ..

PSmalls::AnalRetentiveNumbNut

here are some race gas logs from my car:

Just under 23 PSI spike tapering to ~20.5 by redline, a bit of timing advance after ECU reset by unplugging...

<img src="http://img.photobucket.com/albums/v654/DocSlow/Woo-7-1-2006_23psi100oct82f_MAFTimi.gif">

<img src="http://img.photobucket.com/albums/v654/DocSlow/23psi100oct82f_26297_AFR.gif">

<img src="http://img.photobucket.com/albums/v654/DocSlow/Woo-7-1-2006_23psi100oct82f_Correct.gif">

<img src="http://img.photobucket.com/albums/v654/DocSlow/Woo-7-1-2006_23psi100oct82f_02Volta.gif">

Just over 23 PSI spike tapering to ~21 PSI by redline, no timing advance and stored CFs from not resetting ECU....

<img src="http://img.photobucket.com/albums/v654/DocSlow/Woo-7-1-2006_23psi100oct66f_MAFTimi.gif">

<img src="http://img.photobucket.com/albums/v654/DocSlow/23psi100oct66f_AFR.gif">

<img src="http://img.photobucket.com/albums/v654/DocSlow/Woo-7-1-2006_23psi100oct66f_Correct.gif">

<img src="http://img.photobucket.com/albums/v654/DocSlow/Woo-7-1-2006_23psi100oct66f_02Volta.gif">

Most recent race gas log, too much timing advance, similar boost curve....

<img src="http://img.photobucket.com/albums/v654/DocSlow/Woo-7-5-2006_23psi100oct70f_MAFTimi.gif">

<img src="http://img.photobucket.com/albums/v654/DocSlow/AFR_23psi100oct70f.gif">

<img src="http://img.photobucket.com/albums/v654/DocSlow/Woo-7-5-2006_23psi100oct70f_Correct.gif">

<img src="http://img.photobucket.com/albums/v654/DocSlow/Woo-7-5-2006_23psi100oct70f_02Volta.gif">

I will fill up with race gas again and play around sometime soon, still need to optimize that setup.

Flyboy

counteracting one another and leaving you where you were before. You started with a leaner, faster burning mixture, which required less timing advance. For the second run the mixture was richer, burning slower, so timing is advanced slightly. The end result is you have the peak pressure happening at the same crank angle.

There should be no question that a mixture around 12.5-13:1 is going to release the most energy. Whether or not the operating conditions in this engine can support that A/F ratio is a different matter. But going richer than 12.5 is just adding gas to act as a coolant, not provide any additional power.

PSmalls::AnalRetentiveNumbNut

So what is your AFR? I've been waiting to see you post since installing wideband....

Mike2kS4

LOL!

Flyboy

It initially dips down to 11.1 @ 3500 rpm and then climbs to 12.0 @ 6500 rpm.

Mike2kS4

But at 9.3:1cr at over 20psi I think we need that extra in-cylinder cooling.

Flyboy

with the water injection some lately, seeing how much fuel I can pull out without seeing any adverse affects. The baseline software runs a lambda from 0.76 up to 0.80, with the WI I've been able to lean that out to 0.82 to 0.84, and I have not yet seen any differences in the logged data. The car is faster though with the leaner mixture.

PSmalls::AnalRetentiveNumbNut

This was last wideband log I did before it started reading all weird, -21.5% primary on this log but since then went to -20.5%:

<img src="http://img.photobucket.com/albums/v654/DocSlow/-21pt5primaryasonlylemmiwinkstweak.gif">

lemieux@curbside

hmm i see that couple degrees of timing + did not make more power ..