What do your timing curves look like?

[spooledstang]

I got the alky injection up and running on my turbo mustang. This stuff is awesome, I make a 4th gear pull, and pull over, and my intake manifold feels like the car hasnt been running! My coolant temps never move under throttle either! So far I'm only using an M10 with 75% methanol and 25% water.

So far I have raised the boost from 8 to 12. I have a timing curve that is 16deg total through the torque peak, then ramps up to 22 deg totalin the higher RPMS. I'm debating if I should get more aggresive with the timing or boost.

What sort of timing curve do you guys run? I hear "22deg" chip alot, is that a flat 22deg, or a curve like I have?

 

[Razor]

You'll make more power on boost vs timing. Proven over and over. But in the battle to make the most power, you have to watch out for detonation. And this is tough on a vehicle without a knock sensor. becuase you have to look at plugs, monitor egts, and look at performance numbers of the car going down the track. Keep upping the pressure while keeping your egt's inline. And be conservative on a street tune. In other words your better off adding too much alky vs too little. If it keels over in performance it has too much being pumped in. You just want enough to eliminate detonation. And with your setup, this means adding more nozzles, or playing with the pressure screw on top of the pump. Or both.

Our timing curves are based on RPM and load. Once our computer maxes out LV8=load, then its based on rpms. Pretty simple. So the lower load/rpm tables on our chips may be 50+ degrees, and our WOT tables will come down considerably to the lower 20's upper teens.. and from there ya go.

 

[spooledstang]

ok, my timing tables are the same. my question is, whats your timing at full load and say, 4000rpm compared to full load and say 6000rpm?

 

[Razor]

Same. Our timing tables are typically same from 224 load and 3600 rpms to 256 load and 4800 rpms. Above 4800 RPM's the chip doesnt add any more timing. Unless a patch is written to change that.

So we dont add timing as load/rpms, and boost come up. Typically we pull timing.

On most variable timing chips/race chips we'll add a bunch of timing to get burst and make the car scream out of the hole.. then as speed increases, pull timing out so it has a less chance of detonating.

Low speed high timing, high speed.. low timing and lots of BOOST