How do you decide which vortech FPR disc to use?
#1
How do you decide which vortech FPR disc to use?
I currently have a 12:1 in my vortech fmu/fpr, and obviously thats too rich.. but how do i decide if i need a 10, 8 or 6:1 ? because i dont feel like spending 120$ to try all 3...
sorry if this is a stupid question, and thanks for any help !
sorry if this is a stupid question, and thanks for any help !
#2
You don't unless you dyno.
http://www.vortechsuperchargers.com/...ries/fuel.html $44.60
P/N 6Z270-010 Recalibration Kit, Includes 4:1, 6:1, 8:1, 10:1, and 12:1
I believe the 3:1 is in the kit also (they didn't list).
http://www.vortechsuperchargers.com/...ries/fuel.html $44.60
P/N 6Z270-010 Recalibration Kit, Includes 4:1, 6:1, 8:1, 10:1, and 12:1
I believe the 3:1 is in the kit also (they didn't list).
#3
Originally posted by Y2KevSE
You don't unless you dyno.
http://www.vortechsuperchargers.com/...ries/fuel.html $44.60
P/N 6Z270-010 Recalibration Kit, Includes 4:1, 6:1, 8:1, 10:1, and 12:1
I believe the 3:1 is in the kit also (they didn't list).
You don't unless you dyno.
http://www.vortechsuperchargers.com/...ries/fuel.html $44.60
P/N 6Z270-010 Recalibration Kit, Includes 4:1, 6:1, 8:1, 10:1, and 12:1
I believe the 3:1 is in the kit also (they didn't list).
#4
Like Kevin said, you will HAVE to put it on a dyno with wideband O2 sensor readings. The amount of fuel you need has a direct relationship to your injector duty cycle (assume 100% unless you have AFC or ECU mods), BSFC, crank Horsepower.
Take a look at this site. It has a very good Fuel Injector Worksheet.
Find out your crankHP.
Assume 0.525 BSFC (no less)
Max duty cycle 80-100%
Fuel pressure - ??? Play with some numbers here ensuring that the Static flow injector stays around 240cc +/- 5cc/min.
This will tell you how much fuel pressure you really need. The vortech FMU disk, say 12:1 will give you 12 psi increase in fuel presure for every Pound of boost it "reads" via the vaccumm line.
If you are pushing 5 psi boost, your fuel pressure will be:
(static pressure) + 5x(disk ratio) = 43.5 + (5x12) = 103.5psi fuel pressure at fuel rail. Some say that you should divide the static pressure by 2, but I have yet to confirm that.
Here are Vortech S-FMU Instructions . This should give you a good understanding of how to calibrate/tune your fuel using Vortech FMU.
There is also a calculator that calculates the size of your FMU disk but I would double check before popping a disk in there & going full boost.
http://www.turbosaturns.com/resources/boost.html
Good Luck & please share your findings.
Take a look at this site. It has a very good Fuel Injector Worksheet.
Find out your crankHP.
Assume 0.525 BSFC (no less)
Max duty cycle 80-100%
Fuel pressure - ??? Play with some numbers here ensuring that the Static flow injector stays around 240cc +/- 5cc/min.
This will tell you how much fuel pressure you really need. The vortech FMU disk, say 12:1 will give you 12 psi increase in fuel presure for every Pound of boost it "reads" via the vaccumm line.
If you are pushing 5 psi boost, your fuel pressure will be:
(static pressure) + 5x(disk ratio) = 43.5 + (5x12) = 103.5psi fuel pressure at fuel rail. Some say that you should divide the static pressure by 2, but I have yet to confirm that.
Here are Vortech S-FMU Instructions . This should give you a good understanding of how to calibrate/tune your fuel using Vortech FMU.
There is also a calculator that calculates the size of your FMU disk but I would double check before popping a disk in there & going full boost.
http://www.turbosaturns.com/resources/boost.html
Good Luck & please share your findings.
#5
Originally posted by Y2KevSE
You don't unless you dyno.
http://www.vortechsuperchargers.com/...ries/fuel.html $44.60
P/N 6Z270-010 Recalibration Kit, Includes 4:1, 6:1, 8:1, 10:1, and 12:1
I believe the 3:1 is in the kit also (they didn't list).
You don't unless you dyno.
http://www.vortechsuperchargers.com/...ries/fuel.html $44.60
P/N 6Z270-010 Recalibration Kit, Includes 4:1, 6:1, 8:1, 10:1, and 12:1
I believe the 3:1 is in the kit also (they didn't list).
#6
Originally posted by hlh0501
i ordered it.. I know a/f guage isnt very accurate , but is it enough to know if im using the right disc .. ?
i ordered it.. I know a/f guage isnt very accurate , but is it enough to know if im using the right disc .. ?
Start big, then go small.... 12:1, 10:1, then 8:1. I wouldn't run smaller than 8:1 unless you are on the dyno since we don't have enough data from the select few turbo owners.
I'm going to run rich until I get on the dyno.
#7
Originally posted by Y2KevSE
By the time you read "lean" on the Autometer a/f gauge... motor.
Start big, then go small.... 12:1, 10:1, then 8:1. I wouldn't run smaller than 8:1 unless you are on the dyno since we don't have enough data from the select few turbo owners.
I'm going to run rich until I get on the dyno.
By the time you read "lean" on the Autometer a/f gauge... motor.
Start big, then go small.... 12:1, 10:1, then 8:1. I wouldn't run smaller than 8:1 unless you are on the dyno since we don't have enough data from the select few turbo owners.
I'm going to run rich until I get on the dyno.
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