Man Scott, you crack me up. I guess that's why Toyota used the same size of fuel lines and a fuel pump that pumps out more than 60 lph greater and can maintain more than 20 psi above what is in the Land Cruiser for their twin turbo Supra..
X2

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Man Scott, you crack me up. I guess that's why Toyota used the same size of fuel lines and a fuel pump that pumps out more than 60 lph greater and can maintain more than 20 psi above what is in the Land Cruiser for their twin turbo Supra..
Man Scott, you crack me up. I guess that's why Toyota used the same size of fuel lines and a fuel pump that pumps out more than 60 lph greater and can maintain more than 20 psi above what is in the Land Cruiser for their twin turbo Supra...
And all of those clowns using the Wallbro's and Supra's fuel pumps and swapping in injectors in excess of 500 cc's are just really in need of a good fpr and that's it...
I hate to drop the C word, but can anyone give me a rough idear of what it might
"cost" to add a supercharger? for an I6. 4.5
kazuma is about $3500, just for the part.
and how does an additional 110 hp translate to rock eating or
trailor pulling?? is that an additional, what, 40%ish??
I'm adding an ARB and Kaymar bumpers and need more poop!!!
already did cold air intk.
On the supra pump. I ran for a week without it and noticed the difference after installed. It seemed to me that the surge of power would last longer when flooring it going from 0 to merging on the highway. I have nothing other than that to offer. Just driving the exact same route for a week and then driving with the larger pump.
I do not have the additional Fuel Regulator. I may add that, just need to reserach it somemore. Don't plan on adding any more injectors.
I was REAL happy with the supercharger. Now that I have gone to 35's, I have lost some of the power and will re-gear over the xmas break.
Where exactly is the data that indicates that the supra fuel pump is REQUIRED for low boosted 80?
What fuel injectors are you running?
What injectors are stock?
How does the fuel pump resistor circuit work exactly?
Does the addition of an adjustable fuel pressure regulator dictate another fuel pump?
I'm more hesitant to do it just because, and more apt to do it because there's a demonstrated need.
Never said anything about "required" or "low boosted". Those appear to be constraints to the argument you've instilled. For me, I'll keep adjusting my boost and my fuel/air demands - and for that matter, pretty much everything on the truck from suspension, tires, electricals, etc. - until I get tired of it or die. I do; however, expect one or both of my children to continue the experiments...
That sounds really high. Is this at the stock 43psi pressure?Stock injectors flow approx 310 cc's.
I'm not certain about this. I believe the voltage regulator output to the pump varies and the output of the pump varies according to the voltage it receives. In this case, the Supra pump puts out a larger volume and at a higher pressure at the same voltage compared to the Land Cruiser pump.
For who? You are good at asking blanket, primarily hypothetical, questions as if there is one explicit answer. Implicit in all of this is that by and large most people on this list will have a "special case" due to the odd combination of "add ons". For me, yes. I want to maintain a higher fuel delivery rate and pressure than what the stock pump I had - the one that came with the truck. I have no idea what the performance of a new stock pump would have done. But given that it was the same price for either pump and knowing what I wanted to do with the truck, I chose the Supra pump and am happy with it. I also purchased the BEGi 2025 rising rate fpr and have been happy with it as well. These along with a good electronic fuel pressure gauge allow me to monitor what's going on at the fuel rail to my satisfaction.
Do or don't do, Daniel-san. Makes no dif to me, just don't come off so authoritative. There is plenty of demonstrative evidence, experiential learning and solid manufacturer's specifications that show the two pumps flow at different rates and at different pressures. There is the same type of evidence that you can create fuel delivery issues with forced induction on the 1FZ-FE when relying solely on the stock fuel delivery components. How you solve that is up to you. Meanwhile I'm sure I'll see you in my rearview![]()
Scott, the flaw to your argument is that you assume the lines are designed to handle the max output of the stock fuel pump and can't handle any more, if that were true, have another FPR wouldn't help either. I don't believe I did it backwards and I did notice a difference. Now if you have some data specifically on the fuel lines and fuel pumps, fine. Don't much care about all your experiance, only data.
A good analogy is plumbing. most homes use 3/8 or 1/2 inch copper. The water pressure into those standard lines varies by location. Increased pressure at the source (pump) provides increased pressure at the faucet (Injector).
Isn't it the fuel pressure regulator that dictates pressure?
Only to a point. As with any pump, it's ability to create pressure is governed by it's ability flow greater than the demand.
I don't know the specifics on our system, haven't got there yet. But what ever pump is installed it needs to flow fuel at a greater rate than consumption to maintain the pressure in the fuel rail. Having a rising rate regulator would seem to almost dictate that the pump be swapped out in order to be able to create that higher pressure in the rail during the large consumption periods.
At this point I think that removing the resistor is more of a band-aid if you need that greater flow. I'd sooner go with the Supra pump and allow it to run on the lower voltage during low consumption periods for greater life.
Right now this is my mind set and will hopefully prove/disprove it this summer.
Now your talking specifics, thats good. So your saying the FPR will prevent the additional fuel. But I believe my point about not having to change the size of the fuel line you are now agreeing with. My analogy was targeted at your comment on the fuel line sizing being a limiting factor. If you re-read my post you will see that I said if the line size mattered then changing to a FPR wouldn't make a difference either.
So Scott admit it, line size isn't a limiting factor.
I think you are trying to make the following point. The Supra Fuel pump can out put more fuel, the lines can handle that additional fuel pressure. However, the stock Fuel Regulator will only let so much fuel into the injectors no matter how much it receives at the input.
I am just trying to ensure we are clear on the bottle neck and the limiting factors. That makes sense. The only reason I can see that I felt any difference is if the stock pump I had was not able to keep up with the fuel regulator at max output.
According to the FSM the max fuel pressure at 1 atmosphere is 3 bar (43.5psi). Not sure what you are asking. Stock regulators max output has nothing to do with operating system pressure of the pump. Pumps are designed for a system pressure at xx volts at a given flow rate.Do you know for sure the stock regulators max output is the same as the stock fuel pump? Not exeperiance, but data for these parts.
Well I've measured the fuel pressure directly after the stock regulator under load (and boost - but that's another thing...) with the Supra pump and the stock regulator limits fuel pressure at that point to ~43 psi (this is a new regulator from Dan). The problem I encountered was that as you went from vacuum to boost there is a definite drop in fuel pressure as you go through the "zero" point (~= to atmospheric). Further, this jibed consistently with what the BEGi (& Mr. Bell) explained in the justification for the rising rate regulator. This was during a simple test and not under WOT. Under WOT it appeared the Supra pump was able to keep the fuel pressure at 43 psi or so, but it also appeared that the injectors can cycle at enough flow rate to demand more than that. Not pressure but volume (& yes I understand Charle's & Boyle's laws...) appeared not to be met. I'm sure the stock injectors are fine for a whole bunch of boost that none of us are hitting yet but there still seems to be not enough fuel entering the combustion chambers under a heavy foot. Christo and others are running extra fuel or water/meth injectors to meet this demand and can then stay into a rich vs a lean condition. I just don't see you doing that with just the stock fuel delivery components.
What I suggest you Supra pump guys do is do the FSM test for regulated fuel pressure (12volts to the pump) at atmospheric pressure. If it's higher than 44psi, your fuel return line is backfeeding system pressure into the rail = there is your increased performance.