Apexi PFC new injector values
 

A vr5 JDM STi njector is rated at 550cc right? So if swaping for a 720cc , what would be the new values?
Should be less than 100% and buggers me about the latency values too. . .
Currently I just put it at 65% and +0.03ms BUT its still spewing black smoke at the exhaust AND u could smell fuel frm the engine bay . . .
AND this is still under temporary IGN/IJN correction of +8/-0.695
Help pls . . .
PS. Do I need to state my other mods?

you need to call a mapper m8.

We dont have any in-house m8, there are only fly-ins frm HKS Japan mybe once evry 2yrs dpending on demand . . .sucks to be in Brunei

Your logic is sound, however ur value is still higher than mine (65%), so if i input 76% wouldnt that mean the injectors gonna open for LONGER than currently set? Thus making it richer than they already are? . . .

have a read through here matey http://www.paulr33.com/powerfc-faq/powerfc-faq.htm

Are you sure they are 550 std? Not 440? If the jump is 440 to 720, then 61.1% would be correct. Also if the plugs are fouled due to running so rich then that might be contributing missfires and making it smell richer too.

Might also be worth checking all the injectors are sealing correctly and not leaking if you have recently changed them.

:thumb:

its a top-feed Greddy 720cc ...suppose ur right as i changed it to 61% today; less black smoke, also changed the latency correction to +0.24ms...a guestimation..the exhaust 'sounds' better than previously...still need to get the correct latency figures...

sealing-wise, the injectors are ok as there are no leaks to be seen anywhere near the o-rings/junctions.

plugs been recently changed, after a hydrolock when just after I reset the APFC, i forgot to adjust the injector figures (running 100% all the way, resulting in fuel awash) ...such a pain in the @rs# changing those plugs I say ...:freak3:

Need to know what injectors you actually changed from. Where they yellow? Or grey?

Have you fitted a adjustable fuel pressure regulator? Is the fuel pressure the same as standard?

I'm not sure but the Apexi for a GC8 may think the OE injectors are all 380cc which means you may need to adjust the injector values to 52.8 if on standard pressure. I would say the inj lag values should be within the following areas:

16v: 0.500-0.540
14v: 0.800-0.760
12v: 1.060-1.020
10v: 1.300-1.260
8v: 1.520-1.480
6v: 1.888-1.848

However, I am not a professional tuner and listening to my advice is taken at your own risk as it is just opinion formed from research. You should really only be tuning if you know what your doing and understand the software your using. You should use correct equipment including a wideband AFR mete etc.

Standards are yellow 440cc at 100% but it needs setting up with a wideband and mapping

Estimates will get it in the region for a gentle drive to a mapper

Thanks for saying that Simon I was just about to delete my post because I thought I might have got the guy to go lean with that injector setting.

So technically if he has gone from 440cc to 720cc 61% should be right.

Should go to a mapper but doesn't sound like that's gonna happen anytime soon.

Why are you adding ignition and altering the fuelling on the temp settings?

+8 will kill it.

If it is still too rich at 65% and you are sure the injectors at 720cc then sounds like an injector oring has been split on fitment of the injectors

adding ign for fuel econ so as to advance the timing (keeping an eye on knocking ) whilst altering altering the fuelling at the same time..all this as even with the 'wrong' injector settings, the rex seeming to be like a diesel powered vehicle but with a totally opposite fuel economy.

granted its not meant for a permanent fix as i still had to find a correct value for the injectors adjustment and latency (methink i got it tho..thanx peps :thumb:) ..so now lets just see how it goes for a while before i start tweaking on the temporary settings as the current map is still on basic map after the factory reset.

steps;
1. reconfigure injectors data
2. oversee car's general feel
3. tweak individual IGN/INJ map cells for normal drive
4. review with afr meter/sensor

the main priority is to get the car running up to its potential now, without concentrating on releasing the 'beast' within ie. drivability against performance. Once i got that, then i can concentrate on fine-tuning the map .

o-rings split?! how could that happened? i wrench it too tight?