750 Injectors

Scaling 650

3.312
1.680
1.032
.864
.648
.552
.360

I put in the 650 scaling above and the mid trim at cruise is nearly perfect. +1.23. BUT, low trim still won't adjust for me. It stays on "0".

Another strange thing I am getting is that after the car is driven and warmed up it won't hold idle. It wants to go full rich and die. If I let it sit for a while it eventually stabilizes to idle again. Then the mid fuel trim that was perfect at cruise is now -11.56 but the car will idle. Low still hasn't moved.

As I start cruising again mid trim will go back to +1.23 or so and hold steady. I roll to a stop and just as before the car wants to go full rich and stall. After a while it will stabilize but the mid trim, yet again, goes to around -11. And still "0" on the low trim.

What gives.

 

This has been an issue for me as well going to try these new scaling at 650 numbers...

 

You may want to try and disconnect your battery for about 30 seconds, reconnect, let the car warm up for about 10 minutes, start logging at idle for about 15 minutes, go drive for about 20-30 minutes, then let it idle again for about 15 minutes and see where you are at...

 

Remember guys if you have an EVO 8 if you make any scaling/latency changes you need to disconnect the battery for about 30 seconds to reset the fuel trims, as flashing alone will not reset the fuel trims like an EVO IX.

 

Scaling 650

4.69v- 3.312
7.03v- 1.680
9.38v- 1.032
11.72v- .864
14.06v- .720 ...could be the cams I dunno.
16.41v- .552
18.68v- .360

Low = 11.2
Mid = -.290
High = .1008

What voltage to fix the "Low"?

Thanks

 

Should be the 11.72, make the latency about 0.1 higher and see where it gets you.

Also realize that at idle you may be at ~12.5v-13v and not 11.72v and that any changes at the actual idle voltage will be averaged between the 11.72 and 14.06 range. It interpolates between the different numbers.

To be sure you can just look at evoscan during idle when the trims are adjusting, and see where the voltage sits at during those adjustments.

 

Scaling 650

4.69v- 3.312
7.03v- 1.680
9.38v- 1.032
11.72v- 1.008
14.06v- .720
16.41v- .552
18.68v- .360

Low = 5.22
Mid = -.290
High = .1008

So I checked my idle and I'm at about 14.1-13.8v. That's good I think. Also, I changed the above 11.72v to 1.008, but I see that my 11.72v is very close to my 9.38v. I now am wondering when am I at 9.38v, and do I need to space that voltage farther apart from the 11.72v?

Also, is it my cam duration thats throwing my number off of the normal posted numbers like John Bradleys ?

Thanks again.

 

Hi Guys, sorry to bring up this old post again but im wondering how update is the FIC 750cc Injectors Scaling & Latency here now?

Should i follow the Latency table from FIC or Mr John Bradly?

Thanks

 

It would be outside the norm if "JohnBradley"s' numbers were off.

 

 

Update : FIC 750cc Injector - Latency & Scaling
Using FIC latency table = Car AF/R - 11.5-12.5
Using John Bradley latency table = Car AF/R - 14-15.5 Superb!
(I adjusted the SD VE% table on the lower load to get it further leaner a bit)

Car just a little hesitation to fire up even engine is fully warm up.

Any idea on how to improve the engine start up?

 

Hi Guys,
im having some problem with my idling as initially my 14.5-1.57AFR range with Mr JohnBradly latency table but now duno why its suddenly go extremely lean 17-18+AFR? Tried increase the latency % little by little but its either extremely Rich or Extremely Lean.

Latency table by JohnBradly vs FIC table.
JB = Very Lean / FIC = Very Rich 11.2-12.5Afr

Using JB table the car afr is very lean and the rpm is low (900-1000)
Using FIC table the car afr very rich but rpm is (1000-1200)

What can i do? Can i tweak on the SD VE %?

Thanks