DirtyJohn

iTrader: (8)

I'm new to HPT and I decided to do my first REAL logging last night.
Flashed for the MAF failure and reset trims.
So I had logged about 75 miles and going on 2 hours of data.
Alot of my cells had on average about 300 samples so I figured i had a good population to base my averages from. Which is what I think i want right?
So anyways, I'm on my way back northbound, and HPT just decides to STOP logging!?!?
Ok, not sure why, maybe the vibrations bounced the spacebar stopping the logger?
So what do I do, i hit the spacebar again, to START logging again.

OOPS, there goes 2 hours and 75 miles of good data.


So yeah, when in doubt, save your data.

p.s. for gas prices

DJ

SScam68

iTrader: (20)

I think it can only log 50000 data points, you might have exceeded that. You could have still saved the data.

DirtyJohn

iTrader: (8)

Your right, I COULD have saved it, if I hadn't started logging again.
I'm fired, booooo.
We'll try again tonight I think, if I can score the laptop off my roomate again.

DJ

silverTA2002

iTrader: (1)

Maybe I can save you some time though.

Why are you logging for 2 hours? What tuning are you doing that needs that?

Most I've ever done is 20 minutes at a time. Plenty of data to tune with.

DirtyJohn

iTrader: (8)

I'm attempting to get my VE closer to +/- 4 by looking at my LTFT's

the method I was planning on ( that i have read in most tutorials) was this
- Set MAF code P0103 by setting MAF freq to 0, thus putting you into SD mode.
- Startup Scanner and reset fuel trims
- Log roughly 1 hour or 100 miles to get your fuel trims to learn themselves out, and attemt to hit as many cells as you can in the LTFT table
- Proceed from there by looking at your log and modifying VE accordingly..(working on data collection now, will work on modifying the VE once I get the data)

From my reading I thought it said the fuel trims take about an hour or 100 miles to learn themselves out, so I was focusing on getting 100 miles in there.
I had already gotten alot of cells logged after an hour, but i was no where near 100 miles, (be kindof hard to do that in an hour, while not going to jail and all)
So yeah, I had plenty of data, but on my way back home, rounding the 75 mile mark of logging, it stopped, etc you know the rest of the story

The bulk of the cells had around 100 samples, with a majority of them from 1800 ~ 3000RPM having at least 300 samples. I figured more samples would result in a more relavant average.
So really I just wanted to log at least 100 samples in as many cells as I could.
I may have been too hung up on the whole 100 mile thing, which is why I ran out of time I think.

Does that process seem to make sense, for a preliminary VE table tune method?

Thanks for any help on my process.

DJ

ninobrn99

iTrader: (8)

i reset my trims, drive for an hour or so to let them learn, then log. Ill scan it just to see how far off they are during the drive, but i dont tune off of that log.

DirtyJohn

iTrader: (8)

I was under the impression that to tune your VE, you do the above, log your LTFT's and look at the results in each cell.
If the cell is +5 or higher, you subtract that amount or less to be safe from the corresponding cell inthe VE table, and do the opposite if its negative.
Or just copy the whole LTFT log and paste negative into the VE.
I.E. I thought the learned LTFT results were what you based your VE changes off of.

If I went by your method, then since I've already done plenty of driving after reseting my trims, I could just log enough to get some data in each cell and use that, instead of driving for hours and miles trying to get 100's of samples in each cell?

Am I making any sense here, or should I just go back and do more reading

DJ

ninobrn99

iTrader: (8)

what version of HPT are you using? if your using 2.x.x then you can create your own pid to add your ltft's and stfts. you copy that and paste special/multiply by 1/2 it in your ve table. save, flash and log until you get them zero'd out or close to. This menthod will work with your stock narrowband readings. I havent used a WB so i couldnt tell u how to do it that way.

DirtyJohn

iTrader: (8)

I did this all with 2.0.17, the newest I think.
I don't think I know what I'm doing so much yet to try and setup my own PID's

Step 1 was just to get some good data, and I screwed that up.
I'm gonna work on getting that logged and maybe post my potential changes before I go flashing.

Would you think, at this point, after reading what I've done, that I need to log for an hour anymore, cause 20 minutes sounds like a much better alternative.

DJ

horist

^^^ The main advantage of long drives is that you have more of a chance of hitting more cells, and will have more useful data for each cell...

That being said... I tuned my car just using a set of short drives, hitting as many cells as I could (I used forced gear selection alot to reach higher load cells)

ninobrn99

iTrader: (8)

if you go into the help files since you have 2.0.17, then look at the demos, there is one that walks you through setting up your own pid. try that out...do a decent 30 minute drive to hit as many cells as possible.

ninobrn99

iTrader: (8)

try this out.

copy your ltft's into the ltft sheet
stft's into the stft sheet
the fullres is for the primary ve and the 1/2 res is for the 2ndary ve if you have it. I got this from RHS. copy and paste special multiply % by 1/2.

DirtyJohn

iTrader: (8)

Thanks for all the help folks.
Its gonna rain today so I won't be able to get any new data to post.
I think when I go out again, ill just log about half as much as I did last time.
I've got a better idea of what it takes to get into some of the tougher to reach cells after last night.
Once I get some data, I'll prob end up posting a log file or some pics of my tables before i go ahead and flash for the first time.

ninobrn99, What am I doing with this spereadsheet?
Did you just want me to post my tables or is this supposed to do some calculations for me?

Thanks again gang for all your input.

DJ

ninobrn99

iTrader: (8)

that excel sheet will do the math for you if you dont wanna set up a histo. get a log, copy your ltfts and stfts over, then paste the calculation in you bin.

DirtyJohn

iTrader: (8)

Sweet, I'm not ready for that, but when I get some data I'll definately give it a shot.
Thanks for all your input.

DJ

bmfcamaro

iTrader: (1)

buy a wideband and make it way easier. then you dont need to worry about the ltft needing to learn.

Viper

iTrader: (6)

To hit cells, I used to drive around in 2nd gear from 1500rpm to redline, then 3rd gear, then 4th, kind of just rolling on and off the gas. Annoys other drivers and all but fills the cells.

TSDuke

That's the same way I do it.

silverTA2002

iTrader: (1)

I think the part where you're "wasting time" is the RELEARN process.

I just drive around for a few days, let the LTFT relearn themselves. Then log for 20 minutes, and make changes.

If you want to tune the table in 2 days, you can drive around like you are. But, if not in a hurry, just wait a few days and let the LTFTs relearn on their own.

Basically, either way, there's not point in LOGGING during the relearn process, other than maybe at the very end. If your STFTs are all close to zero, that's how you know the LTFTs are relearned.

DirtyJohn

iTrader: (8)

Thats' good to know, thanks alot folks.

DJ