IFR and Fuel Pressure
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From: St.Louis, MO
IFR and Fuel Pressure I just added SVO 30# injectors and a Walbro in line pump. We are seeing 66psi fuel pressure. I found some older threads in here that said to multiply the IFR table by 127% for these injectors. However, that was assuming the fuel pressure remained stock. I'm trying to figure out what the multiplier is when also taking into account my higher fuel pressure.
I used the injector calculator and the values it said to enter into the IFR table were very different than what the 127% values were. Matter of fact, the numbers were *** backwards (lower numbers in the lower tables and higher numbers in the higher tables). That is completely opposite of which way the stock numbers increase (higher numbers in the lower tables and lower numbers in the higher tables). Not to mention the Final Table in the calculator goes from 0 to 80 kpa while in LS1Edit the IFR Table goes from 100 to 20 kpa. So I don't have much faith in that calculator.
Can anyone help me? I don't know if I should multiply the entire IFR table by a constant percentage or if I should use the values the calculator gives me. If the latter, why are the tables different?
I used the injector calculator and the values it said to enter into the IFR table were very different than what the 127% values were. Matter of fact, the numbers were *** backwards (lower numbers in the lower tables and higher numbers in the higher tables). That is completely opposite of which way the stock numbers increase (higher numbers in the lower tables and lower numbers in the higher tables). Not to mention the Final Table in the calculator goes from 0 to 80 kpa while in LS1Edit the IFR Table goes from 100 to 20 kpa. So I don't have much faith in that calculator.
Can anyone help me? I don't know if I should multiply the entire IFR table by a constant percentage or if I should use the values the calculator gives me. If the latter, why are the tables different?
Last edited by PewterZ28; Jun 3, 2005 at 09:45 AM.
66psi/40psi = 1.65
sq rt (1.65) = 1.2845
1.2845 * 30# = 38.53 lb/hr at 66 psi rail pressure
38.53/your current injector flow rate (26.4 or 28.7 if stock) = your IFR scalar
Take this IFR scalar, highlight your whole STOCK IFR table, and use the multiply function!
sq rt (1.65) = 1.2845
1.2845 * 30# = 38.53 lb/hr at 66 psi rail pressure
38.53/your current injector flow rate (26.4 or 28.7 if stock) = your IFR scalar
Take this IFR scalar, highlight your whole STOCK IFR table, and use the multiply function!
i actually monitored my rail pressure for different map values and made a new table from there. my ve looks a lot smoother with less large humps in it. but if u cant find it at different values, what he said will work great
