Supercharged 440

[Simon Quested]

Hi Jason 

Sounds like a nice engine!
 
> Rob at Force fuel injection told me that i better add enrichment fuel to
> the top of the blower (roots have low efficiency you know) to provide some
> additional cooling so I'm working on that now.

I have a EFI supercharged (roots) 2L pinto engine in my Capri. 
To fix the problem off charge heating I used a very simple DIY water injection
set up. It is a PWM 555 circuit controlling a windscreen washer pump
that injects in to the TB, the water injector is mounted in the air filter. 
The amount of water injected is adjustable on the dash. 
I just increased the water until the detonation stopped.     

The whole set up cost about US$25

The only hassle with water injection is all the extra hardware like the 
water tank pump and plumbing.

> I dunno how is the best way to drive the additional injectors though - any
> ideas on an inexpensive additional injector driver would be appreciated

I forget who suggested it but the easy way is to use the pulse to the injectors,
feed the injector signal in to 1 input of a 2 input AND gate the other input is 
controlled by a hobbs switch, the out put goes to an injector driver. This way 
when the boost reaches the set point the extra injector comes on and it is 
triggered / controlled by the ECU.

Cheers

Simon 

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  Simon Quested 
  Computer Engineer, Silicon Graphics & Windows NT Support
  LINCOLN UNIVERSITY OF NEW ZEALAND
  Phone (64)(03) 3252811 Ext. 8087
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A person who smiles in the face of adversity 
.....probably has a scapegoat.
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