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Discussion Starter #1 (Edited)
With the following mods on my car: tegiwa airbox, FD2 intake pipe and TB, RRC manifold. And these mods to come soon: FD2 cams and Toda manifold.

Can my stock injectors keep up? How high will be the duty cycle?
A friend of mine brought this to my attention. It didn't occur to me at all.

He suggested a Walbro fuel pomp and RDX 410 cc injectors.

Is it sufficient to install only 410 cc injectors? Or would 750cc injectors be even better?

Or does it have to be a combination of the fuel pomp and injectors?

Regards
 

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I'm running similar to you except with lumpier Toda A3 cams and making nearly 270bhp at the fly. I'm on stock injectors and they're doing just fine. You don't need to worry about injectors just yet :)
 

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with toda a3's full bolt ons and raised compression ratio 13.3 afr , stock injectors and stock pump were maxed out
power at 270 also
with a walbro gss342 , its was fine , or stock pump and 410 rdx inj
dont recomend the setup dear lunar , it may have worked out for you , but it is dangerous
stock injectors are fine for the setup of the initial poster though
 

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with toda a3's full bolt ons and raised compression ratio 13.3 afr , stock injectors and stock pump were maxed out
power at 270 also
with a walbro gss342 , its was fine , or stock pump and 410 rdx inj
dont recomend the setup dear lunar , it may have worked out for you , but it is dangerous
stock injectors are fine for the setup of the initial poster though
My injectors are working at 90% duty at full power. TDI South are very happy with my set up and that's good enough for me :)
 

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Discussion Starter #6
im running something similiar and im on stock injectors...
How much is your duty cycle? The duty cycle @ +7000 rpm worries my friend.
He says a Walbro fuel pomp and stock injectors would be great for this.
Is this not a case of better being safe than sorry.
 

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Discussion Starter #7

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You can run an OEM quality injector into the 90% range if you want to, I've never heard of an issue personally.

I'm using RDX's with 270hp N/A hitting the late 60's @ stock pressure
 

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My injectors are working at 90% duty at full power. TDI South are very happy with my set up and that's good enough for me :)
90% is not so safe if you consider that all major injectors manufactures recomends duty cycle up to 70%.

anything more than 85% it's risky imo!!
 

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Discussion Starter #16
I'll think I'll change the fuelpomp and after that I can see on the datalogs if I need bigger injectors or not.

Anything over 85% is not good.
 

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complete your mods first and get some datalogs to check up your injectors duty cycle,then decide what to do with the fueling system.
 

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Can't see fuel pump helping much as it is good to flow way over 330bhp.
Changing injectors is the correct route when required in your application. ;)
I'm happy driving stock injectors as high a 95% on NA setups as its only at peak for a split second and they are good quality. If it was RCs I'd be thinking about up rating anything over 75% :lol:
 

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Discussion Starter #19
Ok, I'll wait and see my datalogs when the car is mapped.
 
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