FPR and Fuel rail mod
- Thread starter lancerman
- Start date
tryg
New Member
I have done this on a Ford; an XR6 with supercharger. This was essential for the extremely lean condition that occurred because of the charged air. My stock injectors could not throw enough fuel. A part of that change-out was a new larger volume rail and bigger delivery pump. I also had an aftermarket ECU in that vehicle too... that was done after I had already sorted the induction and exhaust... It's all about setting yourself up for making the big changes.
I wouldn't think a rail alone, with or without an FPR will do anything....
I wouldn't think a rail alone, with or without an FPR will do anything....
tryg
New Member
If you read ghost stories, do you believe in ghosts...!?
There is no way this mod would work, without changes to fuel pump and injectors (there is a fine line of allowance beyond the normal fuel tables, usually 15%). Beyond that, to get more power, you must increase capability... you certainly don't need a degree in physics to work this out....
Bigger injectors = more flow. More flow = bigger power.
If you cannot make the flow big enough, having more capacity in your rail means nothing. And, as petrol has a lower specific gravity compared to pure water, the fuel pump has to compress more in there (meaning it has to work harder to keep the pressure up...
When you give, you take...
There is no way this mod would work, without changes to fuel pump and injectors (there is a fine line of allowance beyond the normal fuel tables, usually 15%). Beyond that, to get more power, you must increase capability... you certainly don't need a degree in physics to work this out....
Bigger injectors = more flow. More flow = bigger power.
If you cannot make the flow big enough, having more capacity in your rail means nothing. And, as petrol has a lower specific gravity compared to pure water, the fuel pump has to compress more in there (meaning it has to work harder to keep the pressure up...
When you give, you take...
tryg
New Member
you wont do it unless you have seriously modded the car (stroked it/bigger cams/turbo onto an NA/bigger injectors etc)... Have you done this?!?!?!?!?!?
Putting in a bigger pump and rail will do nothing unless you tell your puter to put more fuel through the injectors, or increase the throw of the injection system...
Holistically, you must make all the parts talk the same language; more fuel through pump at higher pressures, gives you the ability to use a bigger capacity rail, flowing into bigger throw injectors, told to do so by the computer that has been corrected and dyno run, through an engine that has the ability to take that power and an exhaust and induction system capable of measuring and exhausting that extra volume....
Putting in a bigger pump and rail will do nothing unless you tell your puter to put more fuel through the injectors, or increase the throw of the injection system...
Holistically, you must make all the parts talk the same language; more fuel through pump at higher pressures, gives you the ability to use a bigger capacity rail, flowing into bigger throw injectors, told to do so by the computer that has been corrected and dyno run, through an engine that has the ability to take that power and an exhaust and induction system capable of measuring and exhausting that extra volume....
unfortunatley for NA, you cant just do one thing an expect performance. on a turbo car, sure, change bits here and there, it'll net you small gains.
by putting more fuel in, you need more air
to get more air, youll need the motor to be bigger or move faster.
doing this requires a cam or portnpolish or stronger bottom end, raised CR etc.
so i guess im saying feel free to do this, but in your current guise you wont see much. if you skim the head, put in a cam and valves/springs and retune it, then yeah your fuel rail and FPR will be worth it
by putting more fuel in, you need more air
to get more air, youll need the motor to be bigger or move faster.
doing this requires a cam or portnpolish or stronger bottom end, raised CR etc.
so i guess im saying feel free to do this, but in your current guise you wont see much. if you skim the head, put in a cam and valves/springs and retune it, then yeah your fuel rail and FPR will be worth it
tryg
New Member
I am sticking to the fact you need to remap, or the injectors will do little (because they only allow a small 'correction' due to their efficiency). And remapping will only get you so far... Added to what unclepaulie says above, you must also include this change into your dynamic.
In all of the bikes I have mapped, the parts generally only allow a marginal change of about 10-15%, anymore and you need bigger injectors.
In all of the bikes I have mapped, the parts generally only allow a marginal change of about 10-15%, anymore and you need bigger injectors.
You dont need to add more fuel into a stock car.
A stock cars tune is very rich anyway.
Ive done testing on a stock Mirage and air fuels even dip into the 10s at 6000rpm. That is quite rich for an NA car.
This was also with 4-1 header, and cold air induction.
Your car could be making 200kw atw and the fuel rail will pose no restriction to the power you are going to make.
A stock cars tune is very rich anyway.
Ive done testing on a stock Mirage and air fuels even dip into the 10s at 6000rpm. That is quite rich for an NA car.
This was also with 4-1 header, and cold air induction.
Your car could be making 200kw atw and the fuel rail will pose no restriction to the power you are going to make.
