Hey as the topic says at what stage do you need to upgrade injectors and fuel pump? I was told that at 18psi you only need a good fuel regulator? What about 20-25psi? Also the type of injectors and fuel pump and where I can source them would be much appreciated.

Thanks

CyA's

The standard injectors are good for around 297cc with the FPR right up.

I think thats about 210-220HP @ the flywheel.

& you would not want to run the standard injectors at 100% duty cycle.

As for the standard pump, I have seen it hold around 100kw @ the wheels.

Boost depends on turbo size, 25psi on one turbo would be the same as 18psi on another.

Main thing, when the car is setup, get it on a dyno & work out what boost your going to run .

Intank pump, these work really well in Turbo swifts.
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WALBRO 255LPH FUEL PUMP
MODEL #GSS341 - 500HP RATING - RRP $179.00
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You will need to keep the orignal fuel pickup, cut a bit of pipe & replace with some "EFI" hose.

Or you can go the other way & use an external pump with a surge tank.

A good fuel reg is the billet aluminum SARD. I should have got this one ".

Anyway :
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http://www.nengun.com/catalogue/product/136
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If you can find the above sard reg for a beter price let me know.

I'd say you'd want to start looking at upgrading the fuel system at about 150hp (at the flywheel) for safety reasons, you might be able to push a little more out of it though.
But i'd replace the standard fuel rail and use an adjustable fuel pressure regulator if using any amount of boost.

Phil

Garndi, Just so you and everyone knows. Along with the Walbro GSS341 you can get an install kit. Walbro number is 400-949.

Garndi...when u said said boost depend on turbo size....ect

Wouldnt it be the same........ let say 10psi go in the engine by one turbo or another bigger/smaller turbo.......the amount of psi still the same isnt it?

This is only an example using andy's psi figures. on the same engine with one sort of turbo on 25psi could be 200hp and on the same engine with a different turbo 18psi could also be 200hp.. so you cant say for sure that on 18psi you need to start changing things

thankz alex....it cleared now

Just to add to Andy's statement about different turbo's with different hp figures from the same psi...

Any turbo is able to produce boost. However, one turbo may produce the same amount of boost more efficiently than another. The efficency is relative to the amount of air, which the turbo is able to flow, at a specific level of boost.

This is why turbo's are often rated in HP, or PS.

The efficency zone varies between turbo's, as does the volume of air each turbo produces at different pressure levels. When you look at compressor maps, you are graphing efficiency; with boost pressure, horsepower, and air flow being the variables.

The TD04L for example is able to produce high levels of boost, however it is relatively inefficient, with not being able to flow large amounts of HP, where as the VF22 is able to flow more air, and in effect, make more
horse power than its counterpart.



It isn't about how much boost the turbo can produce; more boost does not necessarily mean more horsepower [refer to DMW Dave's Dyno results], it is all relative to the amount of air which the turbo is able to flow into the engine, efficiently, and effectively.

so a bigger turbo on the same psi makes more power cause its puching the same pressure, but scince its larger, its pushing more air? me confused slightly

Same pressure, greater volume or mass of air.