Hi all,

I currently just purchased a set of RC 370cc injectors. As i am trying to set up the power fc, from the Japanese manuel, it states i need a value of the time between thats between the time ECU sends to the signal to the injectors and injector actually sends fuel out.
Does anyone have this information, Stg? Yack?

Please help me out on this or any relevant informations are grealtly appreciated.

 

That's the injector pulse width...I generally set mine beteen +.2ms to +.3ms, but for 370cc, .1ms to .2ms may be ok...I asked RC about this a while back and they had no clue

 

Arh, thats the correct term that I couldn't get out of my head.

Btw, will there be a significant effect or damage if i didn't get the correct injector pause width??

 

not really...tune it by ear...your car wil idle smoother at some settings bether than others...just guess and check...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MiraiZ &raquo;</TD></TR><TR><TD CLASS="quote">not really...tune it by ear...your car wil idle smoother at some settings bether than others...just guess and check...</TD></TR></TABLE>

Is it true MiraiZ that most Japanese brand fuel injector provide pulse width in the package?
Local turner here in TW said that most Japanese brand provide "PW" but i found it odd that the RC engineering does not provide this information.

 

not really sure DSMs are the only injectores I've ever bought...they are set at .2ms (my tuner set this by the way)...I had them set .3ms before I had my PFC tuned and it ran rich...

 

What MiraiZ said...

 

"Injector Pulse correction value" - the percentage

"Injector Lag time correction value" - the 0.xx ms figure

When mine was standard I set mine to -0.30ms as this gave the same A/F readings as when the car had standard injectors in and the car idled correctly without changing any other values.

Now the TODAs are in all that has gone out if the window.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MiraiZ &raquo;</TD></TR><TR><TD CLASS="quote">not really sure DSMs are the only injectores I've ever bought...they are set at .2ms (my tuner set this by the way)...I had them set .3ms before I had my PFC tuned and it ran rich...</TD></TR></TABLE>

Just want to make sure, MiraiZ, the 0.2ms above, is it the injector time correction value as stated by RichJ?

 

seriously, the lag time value is really arbuturary IMO, just sit in the driveway and idle your car....increase the value gradually unte the idle seems smooth...you'll feel and hear a slight difference.

I am not an expert on this but its the way my car was done, and everything is great.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MiraiZ &raquo;</TD></TR><TR><TD CLASS="quote">seriously, the lag time value is really arbuturary IMO, just sit in the driveway and idle your car</TD></TR></TABLE>

I agree, any change to this value becomes insignificant when you start tuning with the PIM, RPM and "cell" values. The only time the lag time is useful is if the car is fully tuned and you need to added different sized injectors, you can then tune this and the overall adjustment fugure to "match" new the injector fuel delivery to what you have replaced.

BTW anyone have any idea why there are 6 injector settings (I'm guessing they have just been lazy with the software writting)

 

on my car,over the phone with koji from xs,we added time until the a/f gauge started bouncing around like normal and it was perfect

 

Thanks guys for all the suggestion/inputs.
While I really appreciate all the suggestion, I still thought it is a bit un-scientific regarding this tuning issue.

Reasons: I was told that evey injector has a fixed pulse width from injector manufacture. (unless the information I was told is wrong). If we are just tuing by the way car reacted to the differnt value we input then how accurate is it going to be?? I mean the car could idle fine but its not 100% perfect or right.

The Japanese Power-FC manual I had stat that stock fuel injector is 290cc with pulse width 0.90ms. I had Sard 327CC injector before I purchased RC 370cc, and in the product sheet, it stated that the pulse width is .75ms. Therefore, I had no problem seting up the injector lag time correction value. Of course I still have to modify the fuel cell of the fuel curve by A/F meter. But at least it will idels right right after the injector install.

Anyway, I am not trying to argue any point suggested by all you guys! If it is how all you guys done the injector then be it, I will try to follow what you all have done.

But something still just not right IMO.

 

good luck in getting any kind of answers from RC....they were pretty clueless when I asked them