Big cams are better

[Shannen Durphey]

Hi, Joe.  I'm running crossfire injection on a 302 Chevy with 214 deg
I / 234 deg E duration @.050, 64 deg overlap.  A bit smaller, but she
idles really well.  The original F car ecm had real trouble with the
MAP fluctuations, but the 7747 seems to do well.  I've also turned the
idle up a bit, which is a good thing when trying to smooth MAP
fluctuations.
Shannen

joe boucher wrote:
> 
> Does anyone have either practical or theory backed knowledge of the limit of
> how big a cam a 7747 can be reprogrammed for?  I'm running a 245 duration at
> .050 lift in a Chevy 350.  It will idle at about 10 in of mg at 850 rpm.
> 
> The problem I see is the pressure fluctuation at idle.  I'm using a gauge.
> A MAP signal would be all over the place with that camshaft.
> 
> Joe (Bigger IS better) Boucher
> '70 RS/SS Camaro  '93 Suburban
> 
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