[Diy_efi] Strange EFI

[Shannen Durphey]

Aren't the throttle bodies from the Caddy 4.9 engines equipped with cam 
linkage?  Those engines use a TBI TB on a port intake.  Some 
modifications could allow an injector pod to be installed.

A fair amount of response can be dialed out of the tune if you have 
access to the prom.  By making the timing table relatively flat, 
increasing the tps and/or time delay values before PE mode is enabled, 
and reducing or eliminating the timing added in PE mode, a person can 
really increase an engine's response time.

Carby backup might be neat for waaay off-road drivers.  The electric 
fuel pump seems to be the most commonly replaced part in an efi system. 
  O2 sensors are probably next, although considering OBDII's 
hyper-sensitivity, many are probably still serviceable in older 
vehicles.  Other than that, EFI reliability seems to be very good to me.

Shannen

bcroe at juno.com wrote:
> I have not been very happy with the throttle response of a 
> single stage throttle body on an engine over 400 cu in.  Its 
> just too tricky to avoid spinning the tires every time you start 
> off.  I know some have come up with a cam on the linkage 
> to vary the rate of rotation to throttle movement.  
> 
> I have been thinking about using a stripped Q-Jet to get its 
> nice progressive linkage response.  And everything already 
> fits my cars; linkage, intake, air cleaner.  Just add some 
> port injectors.  But wait!  If a Q-Jet is bolted up there, and 
> the EFI quits, I could just hook up the fuel line and I have 
> a carb back up system!  Maybe need to drop in a different 
> distributor base, carry that with the fuel line.  The carb fuel 
> linesand pump are already there, a booster/reservoir up 
> front could supply injectors from the same pump.
> 
> Bruce Roe
> 
> 
> 
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