I have my calibration very close to 128/128 at part throttle, bu i had to dcerese the injector constant 3 points (to 19 from the stock 22) to get resolution i needed in the ve tables. NOw im wondering what kind of effect this will have under pe.

Also, if i have kock retard at wot, do i take spark out of the main spark tables or the pe spark table? Thanks in advance.....

 

Changing the injector size changes the Actual WOT AFR. WOT tuning is seperate from the closed loop you're doing.

You add or delete timing as a function of what the engine likes. You have to actually test things to see what your combination likes.

On one of my cars, I nulled out all the WOT timing changes, and don't even use the WOT timing table, on the other car I use 6d of PE timing adder. All depends on what you got.

 

Grumpy doesn't one of your cars (at least) run boost though?

 

I think Bruce is saying that you can fine tune the BLM's using the timing tables. The Injector Constant has a considerable effect on WOT operation since the AFR is calculated based on the IC. At WOT, you're running open loop and the O2 sensor has no bearing on fuel. The ECM is holding or pulsing the injectors at what IT thinks is necessary to achieve the programmed AFR. "Lying" to the ECM as to the IC will cause the WOT AFR to be incorrect since the ECM ia assuming a certain injector size and in fact it is another.

 

Right, but how exactly does it effect the wot afr? does it make it run leaner or richer afr in general at wot, i would liek to knwo this before i get on it to tune for wot (if its goign to run leaner, i would need to add some fuel to be safe etc...)

 

Use the "PE % change to F/A vs rpm" table to add or remove fuel at WOT. There is another one that is "vs coolant temp" instead of rpm that makes a global change. Both tables are used to calculate fuel/air ratio at WOT. Do a search to understand them and how they are linked. I normally only adjust the "vs rpm" table, but if I had a WB that might not be the case.

 

Here is the answer your looking for...The ecm is designed on the principle of 14.7 under normal driving conditions.PE % change to F/A vs rpm is the % richer than 14.7.If your not running 14.7 then the pe%change will be off.The injector constant is what sets the a/f ratio under normal driving.