I need some Power FC help/advice - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

NHTKID · 01-17-2015, 09:13 PM

Let me start from the top. I had a j4 enthalpy tuned ecu for t28 and s15 injectors. I have since went top mount with a custom 59/57 and bosch 850cc injectors. In that time I picked up a redtop power fc that I hooked up and repined my harness connector to work with my FC. It fired right up and went through the idle learn process and the car drove fine with the big turbo and 480's. I have since installed the 850cc injectors and after making the correction in the commander the car wont start. Its strange because if I leave my correction on 100% the car starts as it did with the 480's.. but if I enter the factory flow rate/the new flow rate 370/850 percentage (43.5%) it wont start at all.. I am confused and need some direction. Another thing I cant find anywhere since I lost my paperwork is the latency times for the new bosch injectors. I am not sure if that may be the case or not. But as I said if I set everything to 100% and 0ms latency it starts no problem.

Questions:
Why does it start with no correction with these huge injectors? It even idles fine. Is this normal? I thought it shouldn't start without the correction taken into account.

If it does start with no correction and goes through the learn process and idles 14.7-15.3 then am I ok to drive to the tuner?

When I do make the correction why will the car not start? I feel like im getting backwards results, as in no correction=start and correction=no start.

I have spent some time reading the guides online on power FC's and have a very basic understanding on how to get the car to start so that I can get it to a tuner (I am by no means a tuner, I just need to get to one). However, some more direction would be nice. Any input would be appreciated because I am confused.

Sorry about the inexperience.
Thanks for your time

NHTKID · 01-17-2015, 09:55 PM

http://http://paulr33.com/powerfc-fa...rfc-faq.htm#57

This is what I read, but hasn't really helped in regards to the injector issue I am having.

NHTKID · 01-24-2015, 03:33 PM

hard to believe no one can help me

Dboyizmlg · 01-24-2015, 04:49 PM

Take it to a tuner

derass · 01-24-2015, 10:18 PM

Have you tried altering the latency with the size correction applied? Maybe try going ±0.1, 0.2, 0.5 and see if that lets it start. I'd skip past doing any 0.0x adjustment, if it was off by only that much, I think it would start.

NHTKID · 01-24-2015, 10:54 PM

Quote:

Originally Posted by Dboyizmlg

Take it to a tuner

do you read?

NHTKID · 01-24-2015, 10:56 PM

Quote:

Originally Posted by derass

Have you tried altering the latency with the size correction applied? Maybe try going ±0.1, 0.2, 0.5 and see if that lets it start. I'd skip past doing any 0.0x adjustment, if it was off by only that much, I think it would start.

ya i gave that a try today. Its weird i may have to trailer it to a tuner. I was under the impression i would be able to drive it though. After messing with it today I found that if i entered the correct percentage correction for the injectors it wouldn't start at all. but if i lowered it just enough to start it, it would idle lean and then drive VERY rich. Im thinking I'm going to trailer it. Any other ideas would be awesome.

Dillinja666 · 01-24-2015, 10:57 PM

put old injectors in, drive to tuner, install new injectors, tune.

Kingtal0n · 01-25-2015, 09:36 PM

To see if latency is the issue, add .50 - .75 to the injector latency table (injector latency vs battery voltage) and re-try a 51%~ global fuel setting.

ggilastpi · 01-26-2015, 12:09 AM

Im thinking I'm going to trailer it. Any other ideas would be awesome

.

01-17-2015, 09:13 PM	#1
NHTKID Zilvia Junkie Join Date: Jul 2011 Location: TX Posts: 380 Trader Rating: (9) Feedback Score: 9 reviews	I need some Power FC help/advice Let me start from the top. I had a j4 enthalpy tuned ecu for t28 and s15 injectors. I have since went top mount with a custom 59/57 and bosch 850cc injectors. In that time I picked up a redtop power fc that I hooked up and repined my harness connector to work with my FC. It fired right up and went through the idle learn process and the car drove fine with the big turbo and 480's. I have since installed the 850cc injectors and after making the correction in the commander the car wont start. Its strange because if I leave my correction on 100% the car starts as it did with the 480's.. but if I enter the factory flow rate/the new flow rate 370/850 percentage (43.5%) it wont start at all.. I am confused and need some direction. Another thing I cant find anywhere since I lost my paperwork is the latency times for the new bosch injectors. I am not sure if that may be the case or not. But as I said if I set everything to 100% and 0ms latency it starts no problem. Questions: Why does it start with no correction with these huge injectors? It even idles fine. Is this normal? I thought it shouldn't start without the correction taken into account. If it does start with no correction and goes through the learn process and idles 14.7-15.3 then am I ok to drive to the tuner? When I do make the correction why will the car not start? I feel like im getting backwards results, as in no correction=start and correction=no start. I have spent some time reading the guides online on power FC's and have a very basic understanding on how to get the car to start so that I can get it to a tuner (I am by no means a tuner, I just need to get to one). However, some more direction would be nice. Any input would be appreciated because I am confused. Sorry about the inexperience. Thanks for your time

01-25-2015, 09:36 PM	#9
Kingtal0n Post Whore! Join Date: Jul 2005 Location: South Florida Age: 41 Posts: 4,828 Trader Rating: (17) Feedback Score: 17 reviews	To see if latency is the issue, add .50 - .75 to the injector latency table (injector latency vs battery voltage) and re-try a 51%~ global fuel setting. __________________ 5.3/4l80e/turbo 240sx playthrough: tinyurl.com/4l80er

01-17-2015, 09:55 PM	#2
NHTKID Zilvia Junkie Join Date: Jul 2011 Location: TX Posts: 380 Trader Rating: (9) Feedback Score: 9 reviews	http://http://paulr33.com/powerfc-fa...rfc-faq.htm#57 This is what I read, but hasn't really helped in regards to the injector issue I am having.

01-24-2015, 03:33 PM	#3
NHTKID Zilvia Junkie Join Date: Jul 2011 Location: TX Posts: 380 Trader Rating: (9) Feedback Score: 9 reviews	hard to believe no one can help me

01-24-2015, 04:49 PM	#4
Dboyizmlg Nissanaholic! Join Date: Aug 2011 Location: SoCal (I.E.), San Berdino, Colton, Redlands Posts: 1,675 Trader Rating: (18) Feedback Score: 18 reviews	Take it to a tuner

01-24-2015, 10:18 PM	#5
derass Zilvia FREAK! Join Date: Jun 2010 Location: Toronto, ON Age: 36 Posts: 1,182 Trader Rating: (0) Feedback Score: 0 reviews	Have you tried altering the latency with the size correction applied? Maybe try going ±0.1, 0.2, 0.5 and see if that lets it start. I'd skip past doing any 0.0x adjustment, if it was off by only that much, I think it would start.

01-24-2015, 10:57 PM	#8
Dillinja666 Leaky Injector Join Date: Jun 2014 Location: San Diego Age: 42 Posts: 56 Trader Rating: (0) Feedback Score: 0 reviews	put old injectors in, drive to tuner, install new injectors, tune.

01-26-2015, 12:09 AM	#10
ggilastpi Join Date: Jan 2015 Location: CA Age: 41 Posts: 2 Trader Rating: (0) Feedback Score: 0 reviews	Im thinking I'm going to trailer it. Any other ideas would be awesome.