if the system was open, then atmospheric pressure could be considered. remember how small atmospheric changes are, day to day.vikingpower said:At first I thought it was the barometric pressure changing, but that didnt seem likely...
most people are 32-36 stock (at idle, line attached). this is usually ~39 psi vac line off.vikingpower said:what pressure should I aim for? I read in MM&FF or 5.0 the set it to 45 but it was on a 4.6.
i hear ya - me too! i would have used different parts had i had internet when i got the car.vikingpower said:thanks for all the feedback, I wish I knew about this site when I first bought my car and started working on it, as I just found it yesterday...
hmmmm, that sounds like one of Jrichker's posts.Funanin said:Get one of your buddies to ride along with you. Find a level stretch of road where you can do some testing.
Don't choose a speed range that will make you shift gears, the shift quality & speed will affect your results
. Use 2nd or 3rd gear and do a run from 2000 RPM to 5800 RPM. Call out the RPM as it increases and have you buddy record it and the elapsed time.
If you have one of those cheap digital watches like I do, a stop watch is built in. Start the fuel pressure at 36 PSI, vacuum off and make a run.
Turn it up to 37 and make another. Be sure to reconnect the vacuum every time you set the pressure
. Keep turning up the pressure and making runs until you notice a drop off in time.
If your bud was careful to record the results, you'll have a nice chart to use to find the optimum pressure.
um yeah, i kinda knew that. i was sorta trying to be subtle in saying perhaps you would want to reference him as the author, since it looks almost verbatim.Funanin said:yup and it works.
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