I just got a set also :-) let me know what you run into and I will do the same, its going to take me a little to get mine in though, hope by the end of february

 

wow just spend the past hour and a half readin through this thread, a lot of good info...cant wait for my evo to come back from TT, wanna check out my trims...

 

Quick question, I have read this post until my eyes bleed, and I am battling the PTE 880s. I took the scaling from here and had to scale them up to 812. I added .1ms to every thing on the dead table, but 14.69 volts. Do I need to add .1ms to every value on the dead time table. I fully understand the purpose, but I could not get this clarified after reading. I have them right now at:
+3 Idle
-3 cruise

Thanks for you input

 

These two are probably the best to start with:

joedr:
scale=770
Latency=3.312 2.304 1.392 1.008 0.792 0.600 0.504

and

bigric09:
scale=770
Latency= 3.648 2.088 1.224 0.912 0.744 0.552 0.456

Both guys report good results, scale the same and the 14V is very similar.
Luck.

 

thanks, Ill give them a try, Ill post my results to see where im at. Thanks again for you help..

 

I need some help with scaling a set of FIC 850s. I've tried all the suggested latencies and scaling with no luck (the trim's still don't register!!). I thought the car ay have had some issues with it so in went a new ECU, new primary O2 sensor and a new wideband O2 sensor. Still though I'm getting no where. I've even gone as high as 50% more than the highest latencies posted and still no effect on trims (ie. they still don't register, staying at .1008).

Just to reiterate - larger latencies (more dead time) means less fuel (ie. going from .504 latency volts to .792 latency volts). Also, with regards to scaling, going from a 696 to a 770 scaling means less fuel as well?

Man scaling injectors is a royal PITA!!

 

Oh and latencies affect idle more so than scaling and scaling affects cruise more so than latencies, correct?

 

More latency = more fuel
Lower scaling = more fuel

Latency will roughly affect idle about twice as much as cruise and almost nothing at WOT/high airlfow. It's is inversely proportional to the IPW.

What does your short term fuel trim say? Are those registering?

 

Oh so the higher the latency number inputted the more fuel that is injected, huh I was thinking of it the wrong way than. I kept increasing the latencies thinking this increased the dead time (which now that I think about it means the injector is opened longer??). The Scaling function I was on the right track.

So far none of the trims nor the feedback are registering?? Suggestions?? I even tried inputting the OEM 513 latencies just to try and get the trims to register but, still nothing.

 

Latency is basically telling the ECU how long the injector takes to repsond. So, if you put in a larger latency value, you are saying 'this injector is slow to respond, so add this amount of time to keep the injector open'. So, this time is basically added to the IPW. That's why it will affect idle more than cruise and WOT. The IPW at idle may be 1ms and cruise may be 2ms, for example. If you are adding 100us (.1 ms) to the deadtime, it's increasing the IPW by 10% at idle ( for a 1 ms IPW).

So, the short term fuel trim isn't registering either? What does the front O2 reading say?

 

I attached a log of the 850s scaled to 770 with latencies as follows:

3.48
1.92
1.368
1.008
0.768
0.6
0.456

The front O2 is reading low to mid .9s so I know its relatively rich, IPWs are at 4.069 and the LC1 is flatlined at 7.408.

 

Start bumping up the scaling until things start coming into line. You are running way too rich.

I couldn't open your log, but no need, as you provided the info needed.

 

The scaling has that much of an effect on idle. I was under the impression that scaling really only effects cruise and the latencies is where its as far as idle trims.

I assume I'll get to a point where the trims will start registering and this point will be before I reach the 850 scaling of the injectors? Also at what point do I stop going up on the scaling? I assume once I get to within +- 10 trim wise? Its been awhile since I've needed to scale injectors and these suckers are fighting me nail and tooth!!

Thanks for the input, its much appreciated.

 

Yeah I am having the same problem with the PTE 880's. I know they are not still done, I have them set:
3.552
1.92
1.296
0.888
0.648
0.48
0.36

Fuel Trim Low = +2
Fuel Trim Mid = +1
O2 Feedback = hanging out at +20 - 23

What am I doing wrong. I have used the Scalings in the post and for instance:
This scale=770
Latency=3.312 2.304 1.392 1.008 0.792 0.600 0.504
gave me:
Fuel Trim low = -3
Fuel Trim mid = -9.5

HELP

 

Your O2 feedback works, it's logged in the file you posted. When it comes to trims not registering, I have one question — is your rear O2 disabled in the ECU? (via Tephra mod or periphery bits)