Another S/C'd member worried about his AFR

[changchewsoon]

I'm currently running stock injectors, but I have 2 additional injectors soldered near to the throttle body controlled by the piggy back.

If I'm not mistaken, the opening/closing time of the injectors are at around 20ms during WOT near the RPM limit.

The duty cycle is around 87% for the stock injectors during WOT near the RPM limit. I always thought that anything above 80% is bad however we've done many hours of extensive testing and the newer version of the Toyota VVT-i injectors are actually quite reliable.

We've also checked with TRD Thailand, as their Turbo Vios are also running the same stock injectors, they too have also done extensive testing on the injectors to ensure their reliability.

However, I'm not too sure whether is there any difference between JDM and USDM specs though.

[largeorangefont]

Originally Posted by changchewsoon

I'm currently running stock injectors, but I have 2 additional injectors soldered near to the throttle body controlled by the piggy back.

If I'm not mistaken, the opening/closing time of the injectors are at around 20ms during WOT near the RPM limit.

The duty cycle is around 87% for the stock injectors during WOT near the RPM limit. I always thought that anything above 80% is bad however we've done many hours of extensive testing and the newer version of the Toyota VVT-i injectors are actually quite reliable.

We've also checked with TRD Thailand, as their Turbo Vios are also running the same stock injectors, they too have also done extensive testing on the injectors to ensure their reliability.

However, I'm not too sure whether is there any difference between JDM and USDM specs though.

Great info. Just to clarify, the 87% duty is NOT while using your extra injectors correct?

Most modern injectors you can run in the low 90% range without issue, so I would say you are fine at your current power level.