wayfarer

iTrader: (5)

I am FINALLY getting into the tune on my LSJ --- I am BRAND NEW to this, and I am following
"The Tuning School"
method.

I have disabled MAF per their instructions, Done a LTFT histo....

basically I logged 2000 - 4000 rpm in second gear, and all the cells were around -50. Their instructions say to paste this value in and "multiply by %"

UM .... 50% change? is that right?
I made the change and flashed it, drove it around and did another LTFT histo. It was really jerky and hard to drive. The cells average -40 now.

so I reduced the values by 50%, and now I'm supposed to reduce them by another 40% ?

this CAN'T be right...can it?

Slowbalt2000

iTrader: (1)

I would start asking the questions BEFORE you blow your **** up.

wayfarer

iTrader: (5)

right?

precisely why I'm here...asking questions

this process is new to me, so I don't know what questions to ask until I question them

like my signature says--- trying to load my brain

Slowbalt2000

iTrader: (1)

Im on mobile, cant see your sig. I suggest joining the hpt forum, they will be able to help a lot faster than the few knowledgable tuners here

jp1600

iTrader: (2)

Just a few things, first of all you probably didn't adjust your stoic ratio. Your car will be running all messed up until you do that on e85. Secondly you probably didn't properly disable your maf. Thirdly, listen to slobalt, your gonna blow up your car. Go back to regular gas until you figure out what you're doing.

bmartz1991

iTrader: (35)

I'd be learning to tune my car first on 91 or 93.

jp1600

iTrader: (2)

^yeah

wayfarer

iTrader: (5)

I changed the stoich ratio to 9.85 under the fuel tab -> Air Fuel Ratio

possible that the MAF isn't disabled correctly. I followed the directions given, but they certainly aren't LSJ specific.

bmartz1991

iTrader: (35)

Are you part of the HP tuners forum like mentioned?

wayfarer

iTrader: (5)

yes. I've been over there reading tonight. Haven't posted yet.

Also sent a request to The Tuning School, since I paid for a year of tech support with the training material.

jp1600

iTrader: (2)

just trust me when I say put it back to gas and figure it out there, you can and the rout you are going will blow up your car.

nhanson

iTrader: (1)

Why not just MAF only tune?

Pretty sure rule of thumb is MAF tune FIRST then VE tune the car.

jp1600

iTrader: (2)

He could, but why not learn to tune the car normally before he goes into e85? even with a maf only tune, ve tables still have a small roll in smoothness

southal cobalt

iTrader: (3)

if youre getting 50s across the board on your ve table, then you are probably using the default config's histograms. those histos are incorrect for the lsj. you have to set up the histo yourself and not use the default one or find one that is already working on the hpt site.

use pids over sensors, no matter what bs messages the scanner has

i hope you didnt buy the tuning school brand new or even new for over 100$. it is terribly expensive, when there is plenty of info on the hpt and rlf

but the method you describe wouldve been correct if you were logging ltft or stft on the ve table properly

i dont know stoich for e85, but if i were you, id be sure its where you want it to be before playing with maf and ve

lsjion

E85 is much more forgiving to learn on, and is much less likely to hurt the engine.
I learned on E85 since my car was already on E and in need of a tune

jp1600

iTrader: (2)

Propped stoich is 10.40

jp1600

iTrader: (2)

Proper•

09CobaltSS1

Negative batman. E85 stoich should be 9.833.

JapEatr

iTrader: (9)

Forget VE, run MAF only, set stoich to 10.4, crank base timing at max load to 26, tun maf with afr error pid

Too much variability in fuels to leave that rich

Too much variability in fuels to leave that rich

jp1600

iTrader: (2)

Correct, that is stoic, sorry I should have actually corrected myself here. God I wish I remembered exactly why to use 10.40, in an older post I read area said to use that ratio, he gave a reason but for the life of me I can't remember why.

Yay! Thank you there jap

jp1600

iTrader: (2)

Now japeater this is assuming as well he knows how to properly modify his timing table, which no offense I'm assuming he doesn't (could be wrong)

09CobaltSS1

Mehh, I understand what you're saying but I'm not really sure if I subscribe to the rules of averaging on this one. Yes it allows for some wiggle room in either direction, but never knowing exactly what the ethanol content is and setting up a middle ground for fueling of sorts I'm not really crazy about.

I'm not sure about Texas, but I know up in the colder parts of the country our ethanol content can range anywhere from 70% - 85%. So for me, I would rather test fuel and know exactly the content, and then tune for it accordingly. The range is just too far for my personal liking. E70 stoich is 10.68 and E85 stoich is 9.83, why not just calibrate for the correct fueling? For something like an LNF you can easily get away with something like that, on a narrow band system.... mehh

armcclure

iTrader: (2)

You could set stoich to 1 if you wanted and still tune the car...
"Correct" stoich is whatever the fuel in your car is.


OP, can you list the filter string of exactly what you are logging on the ve table?

JapEatr

iTrader: (9)

I agree John, the LSJ is like tuning with sharp rocks versus the whizbang lnfs

09CobaltSS1

That's pretty much my mind set as well. E70 and E85 are 2 different fuels and need to be calibrated accordingly particularly when talking stoich. Can you make a 10.4 stoich work? Sure, skew the maf and pe table as far as you need and you'll make whatever wot afr you'd like. You'll NEVER hit your commanded pe though.

I know japeater knows his stuff, so don't take what I'm saying as he doesn't, I just don't personally agree with not setting a specific stoich to accurately represent the fuel being run. Sorry Vaughn..