GenIII Injector Limits Help

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GenIII Injector Limits Help

Postby SkagTits165 » Mon Mar 14, 2016 9:49 pm

So im sure i found on this forum before the limits of stock injectors for GenIII (540cc), but i cant seem to find again. Can someone please help?

Im looking to replace my old injectors, but not sure if i should stay stock size, or upgrade to 650's?
Im running 17-18lbs boost
3" downpipe to 3" exhaust
3" Straight Intake
Walbro 255 fuel pump
Upgraded WTA system

Thanks
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Re: GenIII Injector Limits Help

Postby underscore » Mon Mar 14, 2016 10:16 pm

If you stay stock size, why not get your old ones cleaned and flow matched?
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Re: GenIII Injector Limits Help

Postby SkagTits165 » Mon Mar 14, 2016 10:19 pm

I did before i put the motor in car last year. The fellow out of Vancouver that did them told me that i should be looking for new injectors, as these took some work to get functioning to within spec.
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Re: GenIII Injector Limits Help

Postby aus jd 2703 » Tue Mar 15, 2016 1:50 am

well here is my experience,
im making 260awhp on dyno dynamics chassis dyno,
21 psi of boost from a GTX 2867 running front mount and 3" exhaust all controlled by haltech ps1000 ecu.

at 50psi base fuel pressure I am at about 95% IDC on boost! with a 12:1 AFR. so about there is your limit. IMO
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Re: GenIII Injector Limits Help

Postby RedCelicaTRD » Tue Mar 15, 2016 2:51 am

SkagTits165 wrote:Im looking to replace my old injectors, but not sure if i should stay stock size, or upgrade to 650's?
Im running 17-18lbs boost
3" downpipe to 3" exhaust
3" Straight Intake
Walbro 255 fuel pump
Upgraded WTA system

Thanks


For the real answer you need to know afr and duty %. What turbo/ecu are you running?
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Re: GenIII Injector Limits Help

Postby SkagTits165 » Wed Mar 23, 2016 1:49 pm

RedCelicaTRD wrote:
SkagTits165 wrote:Im looking to replace my old injectors, but not sure if i should stay stock size, or upgrade to 650's?
Im running 17-18lbs boost
3" downpipe to 3" exhaust
3" Straight Intake
Walbro 255 fuel pump
Upgraded WTA system

Thanks


For the real answer you need to know afr and duty %. What turbo/ecu are you running?



Stock ct20 and stock ecu. Wondering if i should make the jump to standalone and bigger injectors, or stock system is within safe levels
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Re: GenIII Injector Limits Help

Postby aus jd 2703 » Wed Mar 23, 2016 7:35 pm

Stock gen 3 running 17psi will get you around 220awhp. Reliable and easy.

Unless you plan on changing turbos. I wouldn't touch the injectors. Like I said before you need to be pushing over 250awhp and around then quite a few things will max out
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Re: GenIII Injector Limits Help

Postby SkagTits165 » Wed Mar 23, 2016 10:07 pm

thanks
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Re: GenIII Injector Limits Help

Postby audiodjmp77 » Mon May 02, 2016 6:05 am

I thought that the standard 540's maxed out at about 300 brake, so you should be OK and iirc 19lbs boost is about 1.3 bar. (Boost cut on a 205)

I would make the jump to standalone ECU, that way you have the biggest base to build from, as anything you do afterwards, the control is there and just needs a few tweaks to sort out
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Re: GenIII Injector Limits Help

Postby ChrisD » Mon May 02, 2016 5:13 pm

I maxed my 540's at around 290-295whp on a dyno dynamics. On the ct20b you should be fine on stock injectors and ecu.
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