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Re: Hotrod convertion

Posted: Sat Sep 17, 2016 10:39 pm
by antus
Yep, short term fuel trim and long term fuel trim are pulling out a lot of fuel (STFT short term fuel trim AKA BLMs are -19 toward the end of the log and LTFT is pulling fuel too). You've also got an idle speed error set, so I think your IAC is questionable. At the end of the log the engine is running at 727 RPM with desired idle of 1000, and the IAC position is 196 which is wide open and still not enough air is getting in. Its possible it is hooked up backwards and gone fully shut or is not working for some other reason.

For the fueling consider the injector rate as well as the VE table.

Re: Hotrod convertion

Posted: Mon Sep 19, 2016 2:36 pm
by cvan1939
As I said at the start I am new at this so where do I start to correct the long term fuel trim and short term fuel trim witch scaler or table do adjust them or how do I change the injector rate to correct them
Charlie

Re: Hotrod convertion

Posted: Mon Sep 19, 2016 2:48 pm
by Dylan
Injector rate is a scalar called similar to "map a bpc" it's a calculation of engine capacity and injector size. For a 350ci and 24lb injectors I'd start with 0.13. Then look back at your logs and compare target afr to actual afr from the wideband and adjust the ve table in those cells.

But before tuning set the open loop flag to disable fuel trims.

Re: Hotrod convertion

Posted: Mon Sep 19, 2016 6:11 pm
by antus
There is also a link to the calculator in the FAQ area (see link up near top right) under the question "Q. What size injectors do I have? I want bigger ones for more performance.".

If you havnt read the guides there, they should help get started too.

Re: Hotrod convertion

Posted: Mon Sep 19, 2016 9:08 pm
by cvan1939
Yep have read FAQ several times and calculated the kingflow to be .119 is that what I need to enter in to tunerpro at map A run-A/F displacement/inject flow rate to adjust for the bigger injectors. Is there any to test the iac solenoid the rod is fully extended is there a way of getting to retract at this stage the car is running well so far the only problem it idles a little ruff till it warms up witch is obviously the iac.
Charlie

Re: Hotrod convertion

Posted: Mon Sep 19, 2016 9:12 pm
by Dylan
As said earlier. Diagnostic mode with engine off will fully extend it. Think you can compress them by hand too first to confirm. It's been a while.

Re: Hotrod convertion

Posted: Mon Sep 19, 2016 9:13 pm
by Dylan
What specs did you enter to get that result?

Re: Hotrod convertion

Posted: Mon Sep 19, 2016 11:06 pm
by cvan1939
24lb and 5.7 in the kingflow calculator.and it gave me the cylinder size in CCs.
Charlie

Re: Hotrod convertion

Posted: Tue Sep 20, 2016 8:48 am
by Dylan
Sounds pretty good. Maybe I run a bit more just incase. I've used .13 a few times for 355 holdens on blue tops.

Re: Hotrod convertion

Posted: Sat Sep 24, 2016 7:05 pm
by cvan1939
The target idle set at 1000is to high should be around the700 that it is running at how do I reset the desired idle back to 700 Know that I need to get more air in at idle so that I can wind the throttle plates back as the idle screw is wound in a fair bit and get the TPS back where it should be.