'747 tuning <<< lean fuel curve

[Marc Piccioni]

Ok will do.
-----Original Message-----
From: rr <RRauscher at nni.com>
To: gmecm at diy-efi.org <gmecm at diy-efi.org>
Date: May 28, 2001 04:06 PM
Subject: Re: '747 tuning <<< lean fuel curve


>
>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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