Latest Tune : 2003 Mach I with Headers & Stack FI

stanps · Stage 2 Joined: 22 Apr 2008 Posts: 58

Here's the latest tune of our Factory Five Cobra we built. It uses a 2003 Mach I engine and trans (all aluminum block & heads 4.6 L, DOHC, 4 valves/cylinder). We put stack fuel injection and Hooker 4 in to 4 headers on it.

Check out the build here: http://stanps4.homedns.org/ffrbuild

Download my latest tune, here http://stanps4.homedns.org/ffrbuild/CurrentDOHC.zip (please note that this tune has not been verified by a wideband).

Any tips or hints would be greatly appreciated!

stanps · Stage 2 Joined: 22 Apr 2008 Posts: 58

Updated!

I added timing to the cruise area, as well as pulling some fuel in the steady speed areas and slight decel. When completely off the throttle the decel fuel cut comes in to play.

Always looking for advise and input. So bring it, if you got any...

stanps · Stage 2 Joined: 22 Apr 2008 Posts: 58

UPDATED!

I've pulled fuel at the cruising intersection of rpm and kPa's, and bumped the timing WAY up (without detonation of course). With combined city and highway driving I just got 32 mpg. I expect to get 35 or 36 mpg on highway driving alone.

And the power is incredible! I need to get to the dyno (with a wideband) so I can verify the tune and get the full throttle stuff taken care of. I think it's also a little rich above 3000 rpm's, but I don't have much of a chance to get up that high and hold it, and mess with the computer. Smile

Please note that this ALL tuned by seat of the pants and by ear. Curious to hear feedback on the fuel and ignition curves, if anyone has feedback.

Stan Smile

cool4now · Stage 2 Joined: 11 Apr 2008 Posts: 70

stanps,
You've got to love the milage with the current gas prices.

It would be very helpful for anyone trying to learn how to street tune if you did a simple step-by-step - i.e.:

used wizard with these settings and it calculated these
added timing to the cruise area, as well as pulling some fuel in the steady speed areas and slight decel like this
pulled fuel at the cruising intersection of rpm and kPa's, and bumped the timing WAY up like this

Of course with screen shots.

Thanks

stanps · Stage 2 Joined: 22 Apr 2008 Posts: 58

Okay, first off...I miscalculated the mpg. It seems that the gas pump kept kicking off when it wasn't actually full, so I when I topped it off, it wasn't ACTUALLY "topped". Neutral

However I AM getting 23 - 25 mpg. It's okay....the fun factor WAY outweighs the so-so mileage.

As for the step by step; I'm not sure I or this tune is qualified yet, to used as a tutorial. I've yet to verify this tune using an O2. However, once I do...I'll be sure to post it with lots of pics. Deal? Smile

Stan