why am I runnin over 100% in some cells on an N/A motor ? is that normal ? or could it be the IFR table causing the higher numbers ?

 

Depending on your mods, its normal. What is your IFR settings at along with the injectors.

 

SVO 30lb, calculated at 40psi test pressure, 60 psi working pressure

36.76923 36.95524 37.20326 37.38928 37.63730 37.82332 38.07134 38.25736 38.50538 38.69140 38.87741 39.12543

 

i've seen big cam cars can go above 115% VE, your IFR seems to be correct for the numbers you've put in, even though i'd disagree on some of your assumptions here, but that's a different topic that's been addressed in the 'lets settle svo rated fuel pressure' thread.

 

Thats really close to what I came up with on yours based on 40psi.

Here is a shot of my screen shot with 30lb SVO's and my current setup.

I personally use 43.5psi on my car with my 30's.

 

 

I've updated my graph to show my current IFR table.

 

correct me if i'm wrong, but if you're not gettin as much fuel as calculated, that will require the VE table to "soak" up the difference, right ? end result being an innaccurate representaion of the VE of the engine

 

i'm with Mr Chad on this one. that's what i meant by not agreeing with your assumptions

 

still dont understand what you mean....you'll have to talk real slow

 

The reason I don't use 40psi is because I have yet to see HARD proof evidence that the injectors are rated at 40psi. I scaled mine at 43.5 with a current PSI of 58psi. My fuel pressure will vary upon startup from 64psi to 60psi after fully warmed.

 

I'll back it up stating that I've seen a proof (or at least a strong suggestion) on my own car, that 43.5psi IS the right number, at least for svo30s. i have also used it on svo42s and it also seemed right.

 

that's another thing that confuses me, how do you adjust startup attitude, if you have 64 psi of fuel pressure at cold idle and 61 psi at hot idle...I scaled my IFR for 60 psi, because that would be middle ground for cold idle, hot idle and WOT

 

got it now

 

From what I have seen this is about the only thing that you can do. I am still trying to figure out why the fuel pressure varies from cold start to a fully warmed up car (30mins). I don't know if it is due to the tank re-pressurizing or what but it pissed me off for awhile until I finally said to hell with it and use 58psi. At WOT my car goes to 58-59psi.

 

i think it has something to do with heat, the power wire from the alternator being right behind the fans and the cramped quarters of the engine compartment,heat increases wire resistance, more resistance = less voltage