What the hell am I doing wrong!!! Chrome Tuning

[DrGonzo]

Well good to know I was not going crazy...lol See what following directions gets me.

Going to try and do some more tuning after I get back from the family gathering tonight.

[DrGonzo]

So I'm finally starting to get somewhere. Getting close to getting the low trims dialed in perfect. I had to use a combination of injector scaling and VE table adjustments. Setting the injectors to 590 alone was not going to cut it. After increasing the VE 0-100 an additional +20 it was still not getting the low trims to budge from 12.5. So I started slowly lowering the injector scaling down to a point they started to move the trims. dropped the scaling -20cc, flashed, let it run for 20 min and monitored. Rinse and repeat.

I now have the trims within a range that I feel comfortable adjusting the VE table without going way out on the adjustments. Injectors are scaled down to 501cc and the trims are FLFTM: 6 and RLFT: 2. So now I can go in and fine tune with the VE table. Not sure why I needed to drop the injectors down 90cc's to get the idle fuel I need, But my intent was to get close on the injector scaling so that when I tune Mid and Open later on my adjustments should be fairly minor. I didn't want to make massive adjustments to the low VE portion to find out I am Stupid Lean in the mid and boost ranges. At Least now I should be rich which is safer than running stupid lean.

[Unlogic]

If you have to enter smaller size for you injector I would double check the fuel pressure. I noticed when I changed FPR that even the smallest change in fuel pressure has a quite big effect on the fuel trims.

I think I'm using an injector size of 580 in Chrome for my evo 560 injectors. Also make sure that you are using the correct latency value because there are two types of evo 560 injectors and they use different latencies (these is a whole thread about on this forum).

Fuel pressure, injector size, ve table and injector latency all affect the low trims quite a lot so try to minimize the unknowns.

[DrGonzo]

Fuel pressure is right on at 43.5 psi. Latencies I am using were provided by Forest I think in another thread I had open.

Latency Values:
6.01 - 1.905
7.89 - 1.695
10.03 - 1.215
12.01 - 0.930
13.99 - 0.750
15.97 - 0.630
16.99 - 0.570


So It looks to be as tuned is as I'm going to get it.

FLTFT: +3.1
RLTFT: -1.3
WBO2: 16.4

This is all at idle with the engine running for the last hour now in the garage. Now I'll start driving it around to get logs for the Mid trims and verify the Low trims are steady.

[Jimvr4]

Fuel pressure is right on at 43.5 psi. Latencies I am using were provided by Forest I think in another thread I had open.

Latency Values:
6.01 - 1.905
7.89 - 1.695
10.03 - 1.215
12.01 - 0.930
13.99 - 0.750
15.97 - 0.630
16.99 - 0.570


So It looks to be as tuned is as I'm going to get it.

FLTFT: +3.1
RLTFT: -1.3
WBO2: 16.4

This is all at idle with the engine running for the last hour now in the garage. Now I'll start driving it around to get logs for the Mid trims and verify the Low trims are steady.

Ran into your thread again and I see you appear to have the low trims dialed in here however your wideband should be much closer to 14.7. You might want to check your WB calibration

[DrGonzo]

Ran into your thread again and I see you appear to have the low trims dialed in here however your wideband should be much closer to 14.7. You might want to check your WB calibration

This is at complete idle sitting in the garage with zero load. 16 AFR is right where I want it to be. 14.7 at dead stop idle is way too rich. there is no load on the engine so it can easily run 16+ afr at idle without issues. 14.7 is what you would tune a cruising idle at.

[RealMcCoy]

This is at complete idle sitting in the garage with zero load. 16 AFR is right where I want it to be. 14.7 at dead stop idle is way too rich. there is no load on the engine so it can easily run 16+ afr at idle without issues. 14.7 is what you would tune a cruising idle at.

I can see that being true, but just to clarify the point, you did specifically target that lean mix under those driving conditions..? Because the factory calibration does not, hense Jim's concern...

[DrGonzo]

There are no driving conditions tuned at this point. This was just setting the base idle AFR to get the injectors scaled into a median point that i can tune the rest of the ranges appropriately. Once driving there will be load on the engine and the AFR will be completely different. I'll be tuning cruising idle from about 15-15.5 AFR like I always have. it gives the best MPG out of the engine.

[Chris@Rvengeperformance]

There are no driving conditions tuned at this point. This was just setting the base idle AFR to get the injectors scaled into a median point that i can tune the rest of the ranges appropriately. Once driving there will be load on the engine and the AFR will be completely different. I'll be tuning cruising idle from about 15-15.5 AFR like I always have. it gives the best MPG out of the engine.

I guess you are going to leave closed loop disabled?

[DrGonzo]

I guess you are going to leave closed loop disabled?

Why do you say that?

and no closed loop is not disabled.