wanted to know if its okay to add a high flow fuel pump (walbro 255) without doing anything else. the reason im aasking is because im getting ready to boost my teg, but waiting for more parts. i just want to add the fuel pump seperately.
i also got 450cc injectors and resistor box. can i add those without doing anything else also?( w/o the turbo install)
is a fuel pump regulator needed?
thanks a bunch
I thought that if you get the walbro 255 High Pressure (HP) then you need an adjustable regulator to keep it at stock pressure. I could be wrong. It’s possible that the stock regulator is still capable of keeping it at 43 psi (or is it 34? stupid memory), but I dont know. If you want to find out, get a gauge and see what happens.
As far as the injectors, your car probably wont idle and will run VERY rich without some form of managment to compensate for the increase in injector size.
i believe my pressure stayed the same with the stock regulater… just get a bandm fuel pressure gauge which is like 30$ and find out its good to have incase u run into fuel issues or if u want to know pressure
i do have a fuel gauge, and its currently showig around 43 psi on stock pump.
i guess im not sure what fuel pressure im suppose to be at with the the high flow fuel pump.
i do have an ecu w. a basemap on it for booost.
would it be fine then to run the injectors w. the new ecu by itself.?
as far as the
It should be fine to use the 450s/resistor box on your n/a setup with a basemap. Im running those injectors right now on my n/a b16 which was turbo. But…don’t run it too long because its fairly rich, and will probably wash out your rings.
DO NOT run your car on 440s until you are tuned…you will run extremely rich because the stock computer cannot compensate for anything other than stock injectors. You would be OK to install the Walbro 255, but only with an adjustable FPR. If you dont use one, chances are the pressure will be too high…you may luck out, but to be safe I would go ahead and buy a 45 dollar B&M FPR for peace of mind…and wait on the injectors. Please do it right and dont be too hasty, Id really hate to hear your motor popped before you get it boosted! Good luck on everything!
you can install a walbro on a stock integra and it will keep the stock fuel pressure. the oem regulator flows pretty well really. don’t run aftermarket injectors on a stock motor(no chip) tho. with 450’s you will run crazy rich. running rich puts alot more wear on your motor.
so i CAN install my aftermarket fuel pump without installing anything else.
everything else (injectors, resistor box, turbo and chipped ecu,etc…), has to wait to be all put together at one time.
coolies
impedance boxes came stock on 90-91 integra’s, so if you have a 90-91 teg dsm injectors are good injectors if you are going turbo. if you have a 92-93 you may just want to buy saturated injectors instead of adding an impedance box.
you can install bigger injectors before you go turbo, but when you install the injectors you have to chip your ecu. if you don’t install these two at the same time you will have problems.
I will be using information from here, which is also using information from here.
Originally posted by tepid1
Lets get started…
In choosing a fuel pump you first want to decide what you want to do with your setup. Do you want to…
A: Have a puller type pump and use either the in-tank mount or modify the in-tank mount or
B: Sump your tank or run a fuel cell
It would be safe to say that if you are making 600+whp then you would most likely run a sump or fuel cell type setup due to the fact that most of your puller type pumps can’t handle much more than that.
Here is some simple math that would be used in selecting your fuel pump based on it’s flow capacity.
Flow = Horsepower * BSFC (Brake Specific Fuel Consumption)
If this is a turbocharged engine most tuners would suggest you use 0.55-0.65 as your BSFC in pounds per horsepower-hour.
That means that:
Flow = (target hp) * 0.60
Lets input some numbers for an estimated horsepower.
In my setup I will be shooting for 650-700whp. Lets go on the safe side with that and have a safety margin here so that we don’t max the fuel pump that we choose. I will choose 750hp as my number because I am taking in account for the loss of power in the driveline as well.
So…
Flow = 750hp * 0.60
Flow = 450lb/hr
To conver pounds to gallons take your final flow calc, which in my case is 450 and divide that by 6, gasoline is approx 6 pounds per gallon.
Flow = 450 / 6
Flow = 75gph
Therefore I would need a fuel pump that can flow 75gph (450lb/hr) in order so supply my motor with the fuel that it needs.
For the people that want to convert the known flow rate of the pump to find out how much horsepower it will make can use this formula
Horsepower = Flowrate / BSFC
Lets use the stock GSR fuel pump in this case.
Horsepower = 131lph / 0.55 (0.45-0.60 for NA veichles)
Horsepower = 262
Figure in a safety margin (I used 8%) and I came up with this
219hp for the GSR pump
133hp for the LS/RS/GS pump
Those numbers are assuming that you are maintaining about 45psi of pressure and approx 12.4vdc.
Originally posted by DJgurglaGSR
…minor error… stock fuel pump puts out 131 LITERS per hour. Not 131gph
Originally posted by sak
[QUOTE]Originally posted by GSR_J
My concern would be volume, not pressure.
Thats the problem with a stock system. You don’t have anything to adjustable the fuel pressure so the more pressure the sytem gets from the pump, the system also gets more volume.
For example, if the injector is opening at a pulse width of 50% that means its on half te time and off half the time. So if we are looking at time, just to make it easier to understand, its on for 1 second and off for 1 second before it comes back on for 1 second and repeats itself.
So if its on for 1 second at 45psi, it is spraying say 100cc (for examle only) until it shuts off. With a higher pressure system, in that same timeframe of 1 second and 50% duty cycle, there will be more fuel sprayed if it were at 50psi.
With more pressure, more fuel will escape from the fuel injector in the same time frame at the same duty cycle, as a result more volume.
So when you have more pressure, you are getting more volume at the same time.
The best and eaiest way to combact the higher fuel pressure is with an FPR like you mentioned. With the adjustable FPR, it will relieve pressure back to the fuel tank enough so that the pressure in the system is right enough to keep the volume similar to stock.
From my experience with the high flow high pressure 255 lph walbro pump, it didn;t seem to matter much in terms of wear. I had it on my JRSC GSR for several years and did not have one fuel problem at all.
Usually people get into problems with fuel delivery when they over kill the pump with too high a fuel pressure line. Guys with massive HP setups usually go with an upgraded fuel line and pump over these things.[/QUOTE]
-Hoots
You don’t need a regulator with a walbro 255HP and DSM 450’s. My car has been running with this setup for a year.
To install just the fuel pump and injectors you will need to adjust your tune for the 450’s. Using TurboEdit I scaled the stock fuel map using the bultin scaling (for 450’s) and it ran fine. I ran it like this for about a month before I boosted.
I never ran with just the upgraded fuel pump so I’m unsure about this config.
i wouldn’t just install the fuel pump by itself.
so installing the 450cc, resistor box, walbro fuel pump and chrome tuned base map ecu would be fine.
just do the pump for now and put in the injectors/ resistor box/ base map when u bolt up ur turbo…
thanks for all the help:burnout: :burnout: