[Gmecm] Reasonable configuration?

[Aaron Russell]

what about speed density on an SFI setup liek the 4.9L cadillac engines? how
do they handle the low idle vacuum of a high lift cam?
----- Original Message ----- 
From: "Joe Simmons" <birdfarm at direcway.com>
To: <gmecm at diy-efi.org>
Sent: Tuesday, October 11, 2005 10:21 PM
Subject: Re: [Gmecm] Reasonable configuration?


> Whoa!!!!!!!   Back up!  The MPFI (with it's mass air sensor) allows a LOT
> more forgiving cam grind / head work / exhaust work (especially cam
grind!)
> than a speed density TBI setup.  Granted, the TBI is simpler, but anything
> that reduces the idle/cruise vacuum constitutes a major tuning
> challenge.......wanna buy my V8'd S10????   BTDT in regard to cam/head
combo
> changes...it's NOT fun!
>
> TBI is quite dependent on the output from the MAP sensor, and lowered idle
> vacuum causes the ECM to think the engine is under load.
>
> I'm sure there's a LOT of support for the MPFI......
>
> Joe S
> ----- Original Message ----- 
> From: "Eddie Sheffield" <eddie_sheffield at yahoo.com>
> <snip!>
>
>
>  I don't want to keep the stock MPFI from the Camaro since it
> > doesn't seem to really allow much in the way of performance swaps (esp.
> > cams) and tuning.
> > Thanks!
> >
> > Eddie
>
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