7749 Ecm -$58 injector sizing ??

[Cheatham 2492]

I know that you have to use the 0x040E BPC Vs desired EGR.
Dose anyone know the formula to use specific injector.
Like 50lb, 55lb 66lb,72lb and 75lb injector sizes? At least those are what I need anyway.
TIA
Dan Cheatham

[mnilss44]

Try this link http://www.rceng.com/technical.htm

[Cheatham 2492]

Actually that wasnt quite what I was after I need the formula to change the injector constant in the EPROM .bin adress 0x040E, code$58
TIA
Dan Cheatham

[Mangus]

injector flow rate for $58 codemask is at offset $328.

For gallon/hr, multiply the value by 0.032614. You should be able to figure out lb/hr from there.

[Cheatham 2492]

No Actually that is not it either. That is used for figuring MPG for the HUD only. The actual injector constant is the F-28 table. It is s figure of enginge size and injector flow but no math to figure it out.
Dan

[Mangus]

Makes sense. That'll teach me to keep my nose out of area's of which I have little understanding.

Hopefully someones else knows the answer to your question. If not, the thirdgen.org boards are a *great* place to get this answered.

Mark

[Cheatham 2492]

Thanks I'll try there.
Dan

[turbodig]

I know that you have to use the 0x040E BPC Vs desired EGR.
Dose anyone know the formula to use specific injector.
Like 50lb, 55lb 66lb,72lb and 75lb injector sizes? At least those are what I need anyway.
TIA
Dan Cheatham

The book sez:

const = 1461.5 * EGR FACTOR * (liters/cyl) / injector rate
Where injector rate is in GM/Sec.

That number will only get you a ballpark figure for BPC... there's *way*
more to tuning $58 for large injectors than that. You end up messing with
a lot of different tables.

You can get one to run with the above, but it's only the beginning.

Later,

Dig