DHP Tuning 101? Help me understand a few things..

[RedZMonte]

Ok, so i have essencially a stock tune put back on my car. Timing and Fuel levels are basicly stock from what i understand. I do have 42.5lb Injectors and got a flow rate figure of "190" and from what ive seen doing a search that is pretty close to what everyone else runs (varries a little depending on fuel pressure).

LTFT at partial throttle is -15 to -20% and under boost its at -2 to 0%, so from what i understand my hard acceloration fuel trims are where they should be.. and WBO2 is 10:1 (will lean that out a little after i learn a little more, but atleast its safe for now) How do i now lean out my crusing speeds under partial throttle (say 10-40% throttle) while out of boost? is that done threw the VE table? partial throttle im seeing 10:1 AFR (no boost, 10-40% throttle).

Also on Decel (foot basicly off the accelorator) the WBO2 also runs 10:1, where would i need to start looking to lean out my Decel?

When Logging to tune fuel, what data should i include in the logging?

Sorry for the newb questions... still trying to learn/understand the tuning side, I read basic info about VE, PE, AE ect so i do kinda understand what they are... I don't have any logs as of yet.. I am trying to understand what each thing means as well as what i should be logging to get the correct info..

S

[3400-95-Modified]

Well....... There is a lot that I could say to this.


First things first you want to tune your part throttle driving and then move to WOT and then lastly try to tweak the Decel... I have yet to touch that but some have and it appears to improve mileage.

did you PM an admin on Powrtuner yet to get access to the downloads section?

[RedZMonte]

i have not pmed anyone to get full access yet... got frustrated and found what i wanted hosted here (because this site is the shyt!)

I understand the "tune Part throttle then move to WOT then Dec..." my question is what field(s) should i be modifying? VE?

What would be my most usefull fields to Log? ive been doing ECT, Spark Adv (timing), KR, TP%, Total Missfires, IAT.

Sorry for all the newb questions, i just want to make sure i understand what im doing.

S

[geldartb]

here's a screenshot from the file to show you what should be datalogged

[RedZMonte]

sweet man, Thanks! now i know what to log. if i want to lean out my tune based upon the data i log... What value(s) do i start changing?

I honestly don't know how to just lean it out a little.... maybe i am not asking the right question... I want to know where to start with leaning out the fuel...

S

[robertisaar]

are you doing a base VE tune, or do you have the MAF hooked up?

[sprucegagt]

http://wiki.opentuner3800.com/index.php?title=Main_Page

/\ this is a good place to start learning. Read it throughly.

[3400-95-Modified]

Your account is activated over on Powrtuner, I spoke with Eddie and he said you should be all set.

[RedZMonte]

sweet guys, thank you. Lol i saw that "Guide to tuning" yesterday randomly on Clubgp and read threw it... not a simple process. Thanks for talking to eddie for me

On another note just screwing around i did scale down my MAF ~10% and it did lean out and does run MUCH better, spools faster, pulls much harder seems to idle a smidge better as well. I dunno if thats the proper way to take out fuel but it does the trick for time being untill i learn a little more.. I was seeing 10:1+ AFR now its ~11.9-11:1 with no KR.

I am running a MAF currently and a stock 1 bar. Am i able to run a 2 bar map and do a SD tune? D.O.H.C. (mark) wants to eliminate the MAF is possible and I am helping him with the tune (lol the blind leading the blind, Scary i know!).

S

[3400-95-Modified]

As long as you have the right IFR in there for the injectors then yes scaling the maf down is the proper way of adding or pulling fuel at part throttle conditions. Anything after that it's a combination of the top half of the MAF table and the PE vs time table.

I would NOT remove the MAF, there is no reason to get rid of it. And yes IIRC you should be able to run a 2 bar map. Search DHP's website I think there was a thread about upgrading to one, or maybe that was a 2-3 change.

BUT IIRC most ECM's have the 2-bar support in the tables.

[sprucegagt]

That 2 Bar support still doesn't work right. It's basically untouched from when it was implimented years ago. Now you can easily change from stock 2 to 3 Bar, but stock 1 to 2 Bar is a no go.

[RedZMonte]

ok so scaling the MAP max Kpa from 98 (stock 1bar setting in my ecu) to max Kpa 196 wouldnt allow the ecu read the boost is what your saying? I came up with the 196 by doubling the stock max Kpa... (only guessing that that would be the correct way to set max kpa for a 2bar)

Somone else said you can but you lose resolution... i assume that allows it to read boost but it isn't as accurate as having a true 2 bar map setup in the ecu?

S

[sprucegagt]

No it will not work. There was a problem with how the PCM measured barometric pressure when using a 2 Bar vs 1 Bar. As far as I know, it was never resolved.

[robertisaar]

No it will not work. There was a problem with how the PCM measured barometric pressure when using a 2 Bar vs 1 Bar. As far as I know, it was never resolved.

gotta love dealing with algorithm...

[blackbombshell95]

Have you got your fuel trims locked in?