please help with tuning my dads daily

[bmorrow8]

The tables that are different are.... under open loop header, gas(gear), gas (p/n), Injtemp gain, and under misc header the EQ ratio min. is different.

[schpenxel]

I've compared the "SD" file you posted earlier to about 10 different factory tunes and all of them have different ECT vs. startup tables in the closed loop enable section.

Just make the whole table 95*F for now

For the O2 readiness table make the whole thing -40*F

[bmorrow8]

Ok. I understand it all now. I had to sit down and talk it through with me dad. you guys are correct. the ltft are killed in the SD tune. Yes that is correct. That is my fault for thinking someone knew what there were talking about. So now that my tables are factory I am going scan and post results

[bmorrow8]

So I learned a few things last night scanning dads truck. He has v6 o2s according to the part number. I'm guessing this has something to do with how it is behaving. Next, I turned the o2s on in the sd tune and the maf off and the ltft and stft worker perfectly but I noticed it starred and ran so much better. Why is that?

[GHuggins]

Learned fuel trims from your previous ignition cycle... Watch the trims while starting cold and you'll be able to see what I'm talking about

[bmorrow8]

alright I think I'm onto something. So I think I've got everything work. I have a question. Should the ltft's be reading in scanner without having to turn the lftf on via Vcm controls? They wouldn't read last night when I was scanning until I turned them on with VCM controls in scanner. Since it wouldn't, what does that mean?

[schpenxel]

LTFT's may be disabled in the tune engine-->fuel-->open/closed loop, LTFT enable, min/max ECT

[bmorrow8]

gotcha. So with ltft's enabled and a table I made in scanner to match the VVE table in hp tuners 3.0, I scanned for an hour yesterday with fuel trims reset and after working on the VVE table and smoothing it out, I flashed and rescanned. The numbers are still about the same. most of the ltft are -17 to -22. Why haven't they gone down to close to 0?

[schpenxel]

Might have not updated the right VVE table. There are 4 of them. Over on the left side of virtual VE editor it'll have a box that says manifold switch open or manifold switch closed. The default one it shows isn't actually used on some cars. Try changing both open and closed VVE tables to the same (new) values and see what that does.

[bmorrow8]

awesome. Thanks so much. I'm starting to get some of this now. I have a question. I am comparing the factory tbss file and the previous tuner of my dads truck has his flow rate vs. press for the injectors different. why would someone change that if they are factory injectors?

[schpenxel]

Is it a big change? And is the fuel system totally stock?

Once upon a time several years ago "tuners" use to "tune" vehicles by changing injector flow rates on the same set of injectors. They didn't know any better I guess. Obviously that's not how it's done anymore since we know so much more about how to do things properly.. but that used to be the norm.

I'm wondering if this tuner is just stuck in some old school ways of doing things

If the fuel pressure is changed or you're running a boost referenced regulator or anything like that then that actually could change the inj flow rates. Otherwise.. I can't think of a good reason

[bmorrow8]

the fuel system is stock and so are the injectors. I think it had a fuel pump put on it but I'm not sure if it was upgraded. Maybe the aren't much but I want to tune this truck right bc it is my dads and I obviously right. the values are the exact same until 308kpa. from 308kpa to 768kpa they gradually go up from 3.0 to 4.0 more than the factory numbers.

[schpenxel]

Looks like they changed all of the injector data. Not sure why they would do that if injectors weren't changed?

[bmorrow8]

I may out then back to factory and retune. I appreciate your help.

[bmorrow8]

We're still having trouble with the start up. Sometimes it start on the first turn of the key but most of the time you have to try 3 or 4 times. When it does start, if you put it in drive or reverse it dies. You have to give it a lot of gas to get it going in reverse or drive but after you are rolling it's fine. Is there a table for airflow when changing gears or something?

[schpenxel]

Min airflow can be set different for each gear.

Take a look at idle-->airflow, base running airflow section, "Airflow final minimum" table and see what messing around with that does

[bmorrow8]

I'll check into that. I have another question. When is wide open throttle and downshifts in the first if you're doing about 35 miles an hour it shifts out a first really soon how do I keep it from shifting out of first so soon?

[schpenxel]

Trans-->auto shift speed, there are tables for full throttle shift and part throttle shift for different gears.. so those are the ones you'd want to mess with

[bmorrow8]

how to do i get rtt on 3.0?

[bmorrow8]

I've messed with that table to try and keep the truck from dying on a hot start and I can't seem to make any progress. It still dies when shifting from park to reverse or into gear when it is a hot crank.