Fuel pump upgrade?

[Turbosolara]

regarding injectors, duty cycle shouldnt really be above 85%. i heared the duty cycle should be let it be about 40-60% would be ideal value.

the other reason is our solara runs returnless fuel system, that make the fuel pressure STABLE. The fuel pressure regulator is build inside fuel tank instead of next to fuel rail. with return line, the pressure is regulated at the fuel rail, the excess pressure/fuel will go back to tank via return line.

here is what i saw from holley

Fuel Requirements
Typically, at wide open throttle, full power, an engine requires 0.5 lbs. of fuel per horsepower every hour. A gallon of gasoline weighs approximately 6 lbs. Therefore an engine rated at 350 horsepower will require about 175 pounds (29 gallons) of fuel every hour.
(350HP x .5lbs = 175 lbs of fuel, 175 lbs/6 lbs = 29 gallons per hour)


Fuel Pressure and Volume
The relationship of pressure to volume is directly proportional. That is, as pressure increases the volume will increase, everything else being equal. A certain amount of fuel pressure is always required to maintain engine performance by assuring that fuel is available on demand. Also, other factors and conditions must be taken into account such as acceleration G-forces and friction within the fuel system itself. At the same time, however, an adequate fuel volume is needed to ensure that the proper amount of fuel can always flow to the engine, especially during peak demand situations. A basic understanding of this critical pressure/volume relationship is needed when designing the proper fuel supply system for your vehicle.

[64Galaxie]

O.k. I'm getting ready to put on my supercharger. I'm replacing the timing belt, Plugs, Plug wires. Is there anything else I need to run at the factory boost level? And where do I get higher psi pulleys?

[JoeB]

UltraslowSolara, that's great information. Now that we have information to figure out the fuel required, does anyone know what the specs are on the stock fuel pump and injectors? The last paragraph is what I was trying to say (although mine was much less detailed). -JoeB

[JoeB]

O.k. I'm getting ready to put on my supercharger. I'm replacing the timing belt, Plugs, Plug wires. Is there anything else I need to run at the factory boost level? And where do I get higher psi pulleys?

64Galaxie, kind of off topic but you can run the stock 4psi pulley on the s/c without upgrading anything in the fuel or ignition system. Most people get their pulleys from pulleyboys. The popular opinion is not to go over 6psi. Some people have gone up to 7psi but then dropped back down to 5.5 or 6psi.

After the s/c, you probably first want to consider intake and exhaust if you haven't already. Then with the smaller pulley, you get to the question I'm asking, will our stock injectors and fuel pump supply the fuel demand? I was told by a VERY reputable speed shop that I didn't need to worry about upgrading the ignition. I was hoping someone here had first-hand experience with the fuel issue. Again, this should be a very straight forward thing. You install a smaller pulley, if you get knocking, can you tune the AFC to allow enough fuel to satisfy the load or is an upgrade needed to the fuel system. Many people must have gone through this already. -JoeB

[64Galaxie]

Thanks JoeB. I was thinking that the factory setup must work ok or TRD would have included more with the kit seeing as how it is covered under warranty. If my car didn't have 83K anyway.

[Turbosolara]

The challenge is that no one knows the solara factory pump spec. Some people here knows the injectors for 1mzFE i guess. I know the 5SFE was 210cc tho.

There were alot of people felt lots of improvement from igntion upgrade (plasma booster and B&M), they claimed the RPM shoots up faster then before and runs more smooth.

[EricSol]

Is that what E.L proto said? thats cool.
Ya, my Air fuel was running really rich after i put the pumping with a six pound pulley. i thought it was a rip off, The car sucks gas like no tomarrow.

Ever since you told me how rich the car is after the pump I have been thinking about it and my guess is its overwhelming the regulator. I installed a 190lph and did not change my a/f at all.

[Turbosolara]

Is that what E.L proto said? thats cool.
Ya, my Air fuel was running really rich after i put the pumping with a six pound pulley. i thought it was a rip off, The car sucks gas like no tomarrow.

Ever since you told me how rich the car is after the pump I have been thinking about it and my guess is its overwhelming the regulator. I installed a 190lph and did not change my a/f at all.

hmm, is it good or bad? I just ordered a walbro 255 high pressure fuel pump. DId you modify to your fuel system and installed a boost depend fuel pressure regulator? Accord to the site i gave, the OEM (i guess is twin turbo) supra pump does over flow because it suppose change the flow depend on the voltage (i think only supra's ECU has the function)

[EricSol]

hmm, is it good or bad? I just ordered a walbro 255 high pressure fuel pump. DId you modify to your fuel system and installed a boost depend fuel pressure regulator? Accord to the site i gave, the OEM (i guess is twin turbo) supra pump does over flow because it suppose change the flow depend on the voltage (i think only supra's ECU has the function)

We have returnless systems, our regulators are built into the tank.

[JoeB]

Well, I finally got my car in for the dyno tune. I was VERY curious to see how it would run after all these mods. From the posts here, I was affraid I would need to do something with the fuel system or ignition system. The guy that dyno tuned it said the fuel delivery was great and I haven't modified it at all. With no adjustments, I was running a little lean on the low end and a little rich on the high end. He said if the fuel system wasn't delivering, the line on the chart would've curved. The line was straight from 3800 RPM to about 6300 RPM. He said the graph looked very good but I should strongly consider a torque converter upgrade. The other question he answered for me is that traditionally, an automatic transmission will give up about 7% power to a manual. As for the ignition, he told me of a guy with a 9 second car running the same wires and the stock setup should be fine but he did agree with using the Iridium IK-22 plugs. So the numbers came out to 242 FWHP and 218 Torque. I would've liked to see a little more but it's still a blast to drive.

99 Solara SLE V6 AT
The main performance mods:
TRD Super Charger w/6 psi pulley
JP Performance Exhaust (Headers/Y-Pipe/Muffler)
RMM Intake
APEXi S-AFC-II

-JoeB

[Turbosolara]

hmm, is it good or bad? I just ordered a walbro 255 high pressure fuel pump. DId you modify to your fuel system and installed a boost depend fuel pressure regulator? Accord to the site i gave, the OEM (i guess is twin turbo) supra pump does over flow because it suppose change the flow depend on the voltage (i think only supra's ECU has the function)

We have returnless systems, our regulators are built into the tank.

Mine is mod with return fuel line with boost depend fuel pressure regulator (3SGTE OEM)

[samuel]

Joe B, that's strange. I have the S/C 6psi, and no exhaust or intake mods and my solara (V6, 5-speed) dyno'd about 259-260fwhp. Maybe I got a strange dyno.

[Guest]

Joe B, that's strange. I have the S/C 6psi, and no exhaust or intake mods and my solara (V6, 5-speed) dyno'd about 259-260fwhp. Maybe I got a strange dyno.

samuel, that is strange. I'm still a little disappointed with my numbers, I think they should be a bit higher. Your numbers sound a bit high though. Maybe yours is just really running efficiently.

I'd like to push higher boost so I'm still trying to figure out the fuel delivery issue. My guess is the Walbro 190ltr/hr pump and Supra injectors would handle it. I don't know the math though and how to figure out what it "should" be. I've heard some people talking about the 2JZ injectors and others mentioning the 1JZ, any recommendations? -JoeB

[cdssolara]

Joe B, that's strange. I have the S/C 6psi, and no exhaust or intake mods and my solara (V6, 5-speed) dyno'd about 259-260fwhp. Maybe I got a strange dyno.

samuel, that is strange. I'm still a little disappointed with my numbers, I think they should be a bit higher. Your numbers sound a bit high though. Maybe yours is just really running efficiently.

I'd like to push higher boost so I'm still trying to figure out the fuel delivery issue. My guess is the Walbro 190ltr/hr pump and Supra injectors would handle it. I don't know the math though and how to figure out what it "should" be. I've heard some people talking about the 2JZ injectors and others mentioning the 1JZ, any recommendations? -JoeB

I agree with you. His numbers seem high if all he has is the 6 psi pulley and no exhaust mods. He didn't mention if he has an S-AFC. Your hp number seems in the ballpark, especially since you have an auto tranny. Your torque number seems kind of low, though. You mentioned that your torque curve was pretty flat, though. That's a positive.

[JoeB]

Actually, my torque curve peaked at 222 just before 4000RPM and dropped all the way to about 180 at 6400RPM (linear flat decline). The flat part was the hp line. From about 3800 RPM all the way to 6400RPM, it is a pretty flat line to 235hp. According to the dyno sheet, it didn't cut out until 6400 RPM and right at that point of cutoff is where the hp was the highest. If I'm right, that tells me my fuel and spark are doing well. I've never seen a dyno that didn't drop off at the high end. I wonder if I'm losing power somewhere else and it just isn't going up quick enough. -JoeB