[Diy_efi] Re. suck through turbo & injector response

[fuelogic at ihug.com.au]

Hey Derek,

I saw a similar setup to what you are describing once...it was a shocker. The 
problem you described about the volume of air causing delays in deceleration 
were very obvious. Another thing you might not have considered are:

1. A huge rpm flare after startup as a vacuum is developed
2. Idle speed oscillations; the original idle speed system probably relies on 
a integral-derivative algorithm that won't be well tuned once you make a big 
change to inlet volume.
Good luck if you do it!

Jack,

I did some practical experiments on the response of high impedence injectors a 
while back. I'm reckon a good approach is to calculate the dead time as 
opening time - closing time. Results using fairly old and low flowing Bosch 
injectors were:

0.4ms at 14V, 0.448ms at 13.5V, 0.512ms at 13.0V, 0.584ms at 12.5V, 0.672ms at 12.0V, 
0.8ms at 11.5V.....Matt



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