Tuning your Feul Pressure for PERFORMANCE
03-18-2007, 02:56 PM
#11
0.5 BAR
Join Date: Jun 2006
Posts: 75
Re: Tuning your Feul Pressure for PERFORMANCE
Originally Posted by MADMAX
Oh man, that is so wrong.
There is a point when you make less power by being lean and trust me it aint as lean as you might think.
03-19-2007, 02:08 AM
#12
1.0 BAR
Thread Starter
Join Date: Mar 2007
Posts: 247
Re: Tuning your Feul Pressure for PERFORMANCE
40~43 psi
Okie What is 40~43 psi in Bar's pressure? i have been chatting to some Guru's and they say the Stock feul pressure is 3 bar so i must up it to 3.5 and leave it at THAT!!!. the last time the car whent for tune up they Adjusted the Feul Pressure but to what im not sure but previosly i have seen the Feul pressure sit at 5 bar at startup will get it sorted....
That is Very valid Piont So increaseing te Feul Pressure change's the Spray Pattern!?!?!. You should NOT be giveing more feul Via you FPR!?!?!
Okie What is 40~43 psi in Bar's pressure? i have been chatting to some Guru's and they say the Stock feul pressure is 3 bar so i must up it to 3.5 and leave it at THAT!!!. the last time the car whent for tune up they Adjusted the Feul Pressure but to what im not sure but previosly i have seen the Feul pressure sit at 5 bar at startup will get it sorted....
Originally Posted by slo_crx1
Stock pressure settings are usually the closest to best atomization, but you can go a little higher than that.
03-19-2007, 06:27 AM
#13
1.5 BAR
Join Date: Sep 2003
Posts: 842
Re: Tuning your Feul Pressure for PERFORMANCE
Divide the amount of psi by 14.5037 to get the amount in bar. As stated before, set the fuel pressure to 40-43 psi, and then get a fuel management such as Uberdata, Crome, Crome-Pro, Neptune, etc., etc., and properly tune the fuel and ignition maps.
03-20-2007, 05:20 PM
#18
0.0 BAR
Join Date: Oct 2004
Posts: 0
Re: Tuning your Feul Pressure for PERFORMANCE
Leave the fuel pressure alone. The only reason you made more power on that NA car (if you even did, which I doubt) is because you got lucky. If you went back on that same NA car and put the fuel pressure back to what it was, and then tuned it with whatever engine management possible, you would see better results.
Adjustable FPR are only needed if your pump/lines flow too much for the stock one to handle, or you want to squeeze a bit more fuel out of your injectors.
Adjustable FPR are only needed if your pump/lines flow too much for the stock one to handle, or you want to squeeze a bit more fuel out of your injectors.
03-20-2007, 05:33 PM
#19
1.5 BAR
Join Date: Apr 2006
Posts: 676
Re: Tuning your Feul Pressure for PERFORMANCE
Tuning fuel is not really the best way to make power. Gasoline's max power range is in the range of 12-13:1 AFR. This has been confirmed by engineers doing testing on single cylinder engines in controlled environments. Based on some thought on safety factor in regards to combustion chamber conditions one should chose a fuel ratio in that range. Boosted vehicles generally go slightly richer to gain an even larger safety factor but is not necessary really as the same safety factor can be applied via tuning ignition timing. As far as fuel pressure is concerned, I wouldn't worry about better or worse fuel atomization based on pressure. Generally speaking injector companies set fuel atomization to be best at a paticular pressure. In our case it will be in the 3bar area(or 40-45psi).
PS: Carbs will always make less power than EFI because of precision. It's just entirely too ridiculous to design an EFI fuel system for 5000hp engines. The design and manufacturing of the necessary components is just not feasible, so they use carbs as mechanically they are easier to develop and manufacture.
PS: Carbs will always make less power than EFI because of precision. It's just entirely too ridiculous to design an EFI fuel system for 5000hp engines. The design and manufacturing of the necessary components is just not feasible, so they use carbs as mechanically they are easier to develop and manufacture.
03-20-2007, 05:43 PM
#20
3.0 BAR
Join Date: Aug 2003
Location: NE-PA
Posts: 4,666
Re: Tuning your Feul Pressure for PERFORMANCE
Originally Posted by Inquisition
Tuning fuel is not really the best way to make power. Gasoline's max power range is in the range of 12-13:1 AFR. This has been confirmed by engineers doing testing on single cylinder engines in controlled environments. Based on some thought on safety factor in regards to combustion chamber conditions one should chose a fuel ratio in that range. Boosted vehicles generally go slightly richer to gain an even larger safety factor but is not necessary really as the same safety factor can be applied via tuning ignition timing. As far as fuel pressure is concerned, I wouldn't worry about better or worse fuel atomization based on pressure. Generally speaking injector companies set fuel atomization to be best at a paticular pressure. In our case it will be in the 3bar area(or 40-45psi).
PS: Carbs will always make less power than EFI because of precision. It's just entirely too ridiculous to design an EFI fuel system for 5000hp engines. The design and manufacturing of the necessary components is just not feasible, so they use carbs as mechanically they are easier to develop and manufacture.
PS: Carbs will always make less power than EFI because of precision. It's just entirely too ridiculous to design an EFI fuel system for 5000hp engines. The design and manufacturing of the necessary components is just not feasible, so they use carbs as mechanically they are easier to develop and manufacture.
