Tune 20355 and 20352 stock tune, is there any difference.

[motolink]

I have tried comparing these tunes but cant see any difference, on tune ecu it states the the 20355 is for aftermarket exhaust, seconderies open but when its down loaded and checked, the seconderies are a stock setting and so are the AF settings.

Does anyone know exactly what the differences are between the stock 20352 tune and the 20355 tune.

 

[dougl]

I have tried comparing these tunes but cant see any difference, on tune ecu it states the the 20355 is for aftermarket exhaust, seconderies open but when its down loaded and checked, the seconderies are a stock setting and so are the AF settings.

Does anyone know exactly what the differences are between the stock 20352 tune and the 20355 tune.

The F and L fuel tables are different. Load 20352 then enter 20355 in "compare file" (in the File menu). Choose a table to compare, then toggle F6 to compare. F1 is richer in 20355 at high RPM and TP. The ignition tables are also different. The secondaries table is the same.

 

[motolink]

Doug, I take it the F table is the is the fuel table, what is the L table?, is the I table the ignition table, but what does the the numbers in each table represent and the 1 2 3 in each table is each cylinder.

Then there is the air / fuel table, how does this table fit with the F table?.

If I can understand this I can then understand the differences in the maps.

Thanks

 

[dougl]

Doug, I take it the F table is the is the fuel table, what is the L table?, is the I table the ignition table, but what does the the numbers in each table represent and the 1 2 3 in each table is each cylinder.

Then there is the air / fuel table, how does this table fit with the F table?.

If I can understand this I can then understand the differences in the maps.

Thanks

F tables are the main fuel tables, one for each cylinder, and operate as a function of throttle position and rpm. The L tables are for lower throttle positions (the change from L to F tables is set in the F_L Switch table) and operate as a function of manifold pressure and rpm. For the ignition tables, the numbers refer to gear: (N) for neutral on the newer Rockets, (1) for neutral on the older ones. There's contradictory opinion on which gears go with what ignition table. What I know is what Wayne at Tuneboy told me: 1 is for neutral, 2 is for 1st, 3 is for second, and 4 is for 3rd-5th.

According to Tuneboy, air/fuel (A/F) contains "target" ratios. They are used to convert the air volume numbers in the fuel tables to an amount of fuel which gets delivered to the injector. These numbers are "arbitrary" and are not necessarily what you would measure in the tailpipe.

 

[motolink]

Doug, that certainly helps, can't say I fully understand but I am starting to get fix on it.
Do you know what the numbers in the tables refer too.
Thank you.

 

[warp9.9]

they are the volume of air in milligrams the ecu thinks is being sucked into the cylinder. It uses this volume along with the target A/F ratio programed in the ecu for that specific area to calculate how many milligrams of fuel it has to add. The actual injector pulse time is calculated using the known value of the injector flow rate. The L tables are doing basically the same thing only using the MAP sensor because it is has finer incremented signal at Low throttle positions where the load changes say like going up a hill withthe wife on the back pulls a little more then a flat road with her on it. Think of it a incremented by actual engine load, its uses a 0-5 volt signal, kind of like the difference in micrometer that read in .001" incrememnts and .0001" increments
Hope this helps does not confuse you.

Its that computer Geeky stuff

 

[motolink]

All the comments are very helpful, bit by bit I am starting to learn how to read the different maps and where & what the changes are.
Far from being an expert but learning.
Thanks