'747 tuning <<< lean fuel curve

[rr]

I'd go right after the BPC @ $2B4. Increase that to match the increase in
displacement. Allocate for injector size changes also. See how it is at idle
first. Make changes as required.

BobR.


Marc Piccioni wrote:

> Its time to dig into a buddies '747 to help him beef up the fuel curve and
> have a few questions.
>
> First the application:
>
> This is a 3/4 ton 7.4BBC  PU truck that is used for towing.
>
> The following mod's have been done:
>
> 1) Engine displacement increased to 482 ci. ( added 0.25" longer stroke
> crank)
> 2) peanut port heads have been replaced with early oval port heads.
> 3) comp cams extreme energy 280 cam installed.
> 4) hooker 4 into 1 headers + freeflowing dual exhaust.
> 5) compression increased to 9.5:1.
>
> So the engine is getting ~ 35% more airflow.
>
> Now for the questions:
>
>  What is best way to richen this up, change the base fuel table or the VE
> table?
> Any thoughts on how much we should increase the fuel pressure to?
>
> /Marc
>

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