240cc prelude injectors

[Ichiban]

I believe they are pre tuned from the factory. If you were to up the boost on a factory car, you would need to allow for more fuel with a management system. Also I know my friends VW has a MAF sensor that allows the car ECU to adjust the fuel based on the amount of air going into the intake. It's only good up to 20 something LB of boost or something like that, then he has to go stand alone fuel management.

Are there FPR's that compensate for boost by upping the fuel pressure, like the vacuum controlled stock FPR's do for N/A setups? I seem to remember seeing these.

[Legend_master]

Are there FPR's that compensate for boost by upping the fuel pressure, like the vacuum controlled stock FPR's do for N/A setups? I seem to remember seeing these.

Im not sure, but the range of of air pressure dosent vary that much with an NA setup. I think the car stays in vacumme at all times on non turbo cars, but acually goes into boost on a turbo car. Honestly I am not 100% sure on the compensating FPR

[Ichiban]

Afaik the vacuum FPR's will provide more fuel pressure at low vacuum (ie WOT) and less at high vacuum (ie idle, off throttle decel)

I would think that a boost controlled FPR (if it even exists, swear I've seen them) would simply provide even greater pressure under boost.

Could be way wrong on this though.

Edit:Also, once a turbo setup is tuned properly, shouldn't its exhaust gas oxygen readings reflect just as narrow a range about stoichiometric as a NA engine? Rich and lean are just as bad, if not worse with turbo?

Sorry for whoring the thread, just curious

[2ndGenGuy]

Does fuel pressure even matter all that much on a fuel injected car? I thought the pump only had to deliver the minimum pressure needed to operate the injectors on a full "spray" or whatever it's called? As long as the injectors are pushing thier max, do you really need more pressure?

[MessyHonda]

Does fuel pressure even matter all that much on a fuel injected car? I thought the pump only had to deliver the minimum pressure needed to operate the injectors on a full "spray" or whatever it's called? As long as the injectors are pushing thier max, do you really need more pressure?

you just need more flow thats why they get thoes 190 willbro(sp) pumps

[Ichiban]

Umm, if pulse width remains the same and pressure increases, flow should increase as well, conversely, if pressure remains the same and pulse width increases, obviously flow increases as well. From what I do know of turbo applications, injector sizes increase because as an injector reaches its peak cycle rate, it begins to flutter and loose flow in a big way.

That and you simply need to flow more fuel, I guess would be a better way of putting it.

[2ndGenGuy]

Makes sense.

[86AccordLxi]

Yeah, gotta have good fuel pressure or else you start to lean out. And smaller injectors running over 85% duty cycle don't like life all that much, that's why bigger injectors are a must.

Alex

[guaynabo89]

exactly

you increase fuel pressure too much and eventually the pressure will be so great the injector will not be able to close as quickly as it should and in extreme cases wont close at all. thats why its not good to bump the pressure up too much because it will cause problems.


a bigger injector will require less pressure to deliver the required amount of fuel which will also keep the fuel cooler.

at the very least to turbo a Honda you'll need dsm turbo injectors and some way to control them.

bottom line you wont be able to turbo anything without being able to control fuel and timing.