smartbomb

I installed some RC1000 CC injectors today and rescaled them using the following scaling and invalid time numbers.

Scaling=850

Voltage----ms
4.69---------3.312
7.03---------2.023
9.38---------1.079
11.72-------0.641
14.06-------0.367
16.41-------0.181
18.68-------0.049

The driveabilty was fine but the idle was pretty rough and not stable, the engine was almost stalling. I know these injectors are pretty big to expect a stock like idle but I increased the idle advance to 12 degrees and rasied the target idle to 650 rpm and zero'ed out the intake cam advance at idle from my agressive mivec map.

Now the idle is very stable but still rough, like I have a mild cam or something. I still have to tweak the scaling after observing the fuel trims.

I would not expect injectors this big to idle well but do you guys get the idle to near stock? If so any tricks other than what I did? On Nissans you can't and thats where my experiance is.

EFIxMR

iTrader: (10)

Do you have a program to check your fuel trims?

smartbomb

Yes but I havent had time to check them yet. Been fooling around between holiday chores.

nj1266

iTrader: (6)

These numbers are only a starting point. They must be refined after driving/idling the car and keeping an eye on fuel trims.

Oracle1

iTrader: (1)

Try doubling the numbers starting from 11 upwards to 16.

mplspilot

iTrader: (7)

short answer would be be - yes you can make them idle exactly like stock.

smartbomb

I would think that the scaling would be the best thing to adjust when observing the trims while driving and the invalid time @ idle voltage the best to adjust when observing the trims at idle?

JohnBradley

iTrader: (30)

The scaling I have observed is 850-860ish and the latency numbers need to be a little more than double. 1.1 @ 11.7v and .800ish @ 14.06v. When I switch to even bigger injectors this next spring (1000's+ for E85)I am going to experiment with rescaling the voltage table and putting something in between 11.7 and 14 to see if it helps curve it a little better. I dont think it will make a difference, but I want to at least see.

nj1266

iTrader: (6)

The thing that surprised me about the latency numbers in the AEM wizard for the RC 1000 cc injectors is how low they were. Usually, the larger the injectors the higher the latency. The latency numbers for the RC 1000 injectors are lower than those for the PTE 680s.

I think it would be best to contact RC and get the latency numbers from them.

smartbomb

So far my scaling is 790ish and I almost doubled the invalid time. My LTFT's are now within a +5% window. I am going to screw around a little more and I'll post up my findings.

The commonly posted invalid times from the AEM wizard posted here are way off.

smartbomb

I didnt want my scaling to end up being this low for fear that my fuel map would be way drifted to the rich side so I tweaked somemore and I ended up using this:

Scaling= 860

Voltage….ms
4.69……..3.312
7.03……..2.184
9.38….....1.560
11.72…...1.008
14.06..….0.696
16.41……0.408
18.68……0.336

Now my long terms trims are within +- 5%. It idles fairly decently, almost stock.

AEM's wizard is way off! Do you guru's think this is acceptable?

Thank you for your help!

EFIxMR

iTrader: (10)

Well, the AEM wizard was made for the AEM, so I think that's why there is a discrepancy between the two. Things just don't port over simply. I think whats useful by looking at the AEM numbers is seeing the curve (if any) on the injector latency they found.

Oracle1

iTrader: (1)

I would bump these 7.03=2.184, 9.38=1.560 to 7.03=252, 9.38=1.704

This should help it start up better, if required.

smartbomb

I'll let it cold soak good and see if I need it, thank you!