[Diy_efi] Injector flow rate

[David M. Ingebretsen]

Hi all.

I'm new to the list but not so new myself :) I've learned enough about EFI 
systems and tuning now (esp. the 1227747 ECU) to be very dangerous.

I am using a TBI system based on the 4.3 liter, 1227747 ECU on my 1990 Wrangler 
with 258 ci inline 6. The system is a Howell Engine system, but the CALPAK they 
provided needs some help. Howell has been very responsive, but the turn around 
time to send them data and then get a chip is painfully long. So, I'm learning 
how and have acquired the tools to analyze, tune, and burn my own chips.

Here's what I've done:
1. Read the papers on the diy-efi site
2. purchased and read John Wilson's book from the CustomEFIS site (don't have a 
password yet. The book refers to flow rates on his site but I can't get in 
there yet)
3. been to every efi site I can find on the net
4. AND called my dealer...

No luck finding the info I'm searching which is:

I am trying to beter calculate the BPW constant. Howell programmed 185, GM uses 
181 on the 4.3 liter and so I calculate 178 for my 4.2 liter after back 
calculating the flow rate associated with the GM number. So, I am confused and 
need to know the flow rate for the "yellow/blue" p/n 5235203 injector. The 
sheet on the DIY site just has questions marks. I tried to back out what GM 
used for the factory chip but am unsure how accurate the 4.3 liter claim is. 
And the flow rate I get is 45.9 lb/hr, greater than the listed injector for the 
5.0 liter (40 lb/hr)!?! Could this calculation be right?

Thanks for the help

So, does someone know the flow rate for these injectors, or a precise 
measurement of the displacement for the 4.3 liter engine?
Bye,

David

David M. Ingebretsen, M.S., M.E.
Collision Forensics and Engineering, Inc.
2469 Fort Union Boulevard, Suite 114
Salt Lake City, Ut 84121

dingebre at 3dphysics.net
(801) 733-5458


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