Injector swap tuning W/ HPT
#3
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You need to adjust your Injector Flow Rate Table. This is very easy.
Use this calculator:
http://www.blackls1ta.com/Tools/JohnsInjectorCalc.xls
Enter the values in the top such as:
Test Injector Flow Rate: 30
Tested Pressure: 43.5psi
New Fuel Pressure: 58-60psi
This is assuming they have been flow tested at 43.5psi which they probably have and that you are running stock fuel pressure which is about 58psi. If you dont have one, get a fuel pressure guage.
The values that come up in the bottom chart are the ones you need to use in the HP Tuners software for the IFR Table
Use this calculator:
http://www.blackls1ta.com/Tools/JohnsInjectorCalc.xls
Enter the values in the top such as:
Test Injector Flow Rate: 30
Tested Pressure: 43.5psi
New Fuel Pressure: 58-60psi
This is assuming they have been flow tested at 43.5psi which they probably have and that you are running stock fuel pressure which is about 58psi. If you dont have one, get a fuel pressure guage.
The values that come up in the bottom chart are the ones you need to use in the HP Tuners software for the IFR Table
#5
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Originally Posted by HumpinSS
why does everyone use 43.5 when 3 bar is 44.1 (14.7*3) and 4 bar is 14.7*4 (58.5)
#6
TECH Senior Member
fortuanetly for our purposes it doesn't matter what value is used... we could use 3 for 3 bar and 4 for 4 bar... so long as 1 is 1 bar and 4 bar is 4*1 bar and 3 bar is 3*1 bar ...
Maybe whomever first created fuel injectors was at a different altitude whereby 14.7:1 wasn't air pressure?
Maybe whomever first created fuel injectors was at a different altitude whereby 14.7:1 wasn't air pressure?
#7
TECH Senior Member
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i will have to tune for the new fuel injectors i have. i went to the ls6 ones, i have to tune for the bolt ons, maf and injectors. how will i do this with them all on the car now? i can put a stock maf on there but what about the injectors?? sorry to barge in on your post but i never thought about the injectors