Power-Fc Help

[debusan]

Greetings,

I need a little help with my Power FC.

I got a Power FC for my R34 GT-T and purchased 550cc drop injectors for it. This is all part of a build I am doing and I want the car to be able to run so that it can be driven to the tuner. I understand that you need to adjust the injector setting on the Power FC to account for the difference in stock injector size. Stock is 330cc correct? so 330/550 = 60% but you also need the latency information.

The did not come with the injectors and when I asked the seller I received this information:

Dead Times

Volts 8 9 10 11 12 13 14 15 16 17 18

ms 1.144 1.033 0.923 0.833 0.744 0.672 0.600 0.528 0.456 0.384 0.312

So which one is the right one?

I would appreciate any help. Thanks.

Edited July 31, 2012 by debusan

[89CAL]

Read the power fc FAQ. What injectors are they? NISMO's?

[debusan]

Read the power fc FAQ. What injectors are they? NISMO's?

They are Bosch Drop in injectors for R34 and 350z

[GTSBoy]

That latency info you were given is the change in latency with different voltage applied. You also need the basic latency number. Having said that, given that they are probably meant work at around 13.5V, you will see that the latency at that voltage is about 650ms.

You can (and should) do your own research and use the part numbers on the injectors, coupled with 3 or 4 brain cells and Google, to look up the latency.

[debusan]

That latency info you were given is the change in latency with different voltage applied. You also need the basic latency number. Having said that, given that they are probably meant work at around 13.5V, you will see that the latency at that voltage is about 650ms.

You can (and should) do your own research and use the part numbers on the injectors, coupled with 3 or 4 brain cells and Google, to look up the latency.

I appreciate your info, I have heard conflicting information on the size of the factory injectors and their latencies as well with what you just said that would put these ijectors as having near the same latency as the fatory ones which follows with them being drop ins as advertised.

One other thing,

Does anyone have the real info of the stock Rb25DET NEO injectors, as looking on google I have seen many dieeferent numbers from 330-380

With 380cc at .6ms appearing most often, Thanks

[GTSBoy]

According to Nistune, ER34 RB25DET injectors are 380cc and 0.71 milliseconds (710 microseconds).

[debusan]

According to Nistune, ER34 RB25DET injectors are 380cc and 0.71 milliseconds (710 microseconds).

Thanks I appreciate it.

[jiffo]

Forget about the lag time, let the tuner do them properly.

You can only access the 14V lag time on the hand commander, the tuner will do all the voltages via Datalogit.

[AngryRB]

I know my nismo 555's were 62.5% and 0.18ms,

so its probably close to this, subtract your .7 from the new latency, so it looks like it will be around 0.20 ish??

if your cranking for too long your plugs will get wet, just thought id mention, cause once there wet its not going to work even with the right settings..