ok im looking at tuning for my f/i setup and i was just curious.....i was looking at the differences in hptuners and i came up with that the basic version of hptuners would be sufficient for tuning...without the ability to tune via wideband.....my question is what would the difference be in tuning via wideband and tuning via ltft's or whatever they are...lol i cant rem. the name right now....what would the processes be?....im trying to justify wether or not to go pro or just standard

 

i dont have a clue about tuning with HPtuners, but you NEED a wideband to get any kind of even a decent tune

 

Tuning with a wide band makes much easier and more accurate because you can log the higher RPMS. When tuning with fuel trim's, once you go in to PE the fuel trims are locked and cant use them. You can get close but it wont be perfect with out the wide band.

But you can tune the PE and maf and should still make it work.

 

lets just say if your working on a f/i engine....widebands are a must...theres a lot less room for error on f/i engines

 

can anyone explain the process i would follow tuning with a wideband?

 

Think of it as trial and error

You're using the wideband as a reference.

If you raise the amount of fuel and at a given point in your powerband it's too rich (you'd know this from reading off your wideband and datalogging) then you would start to lean it out a bit.

When it comes to messing with timing though, I would highly suggest you have a EGT probe/unit

This is why I told you to get the Zeitronix Unit cause it has EVERYTHING with it.

 

After verifying the AFR error, you would setup a histogram to log AFR error vs MAF freq low & high. this will get the fueling right.

 

There's a sticky with some good info on VE tuning. MAF tuning with a wideband is basically the same, but don't fail the MAF.

https://www.cobaltss.net/forums/tuning-131/1st-setup-injectors-flowrate-rate-modifier-min-pulse-width-pw-adder-69454/

The post by ssnipes is about injectors (good stuff). The second post is on afr tuning.

 

is the tuning in thread also compatible witht the le5?

 

I do not know anything about the le5 specifically. So far I havwe only tuned LSJs and LS1s. Some of the tables might be a little different, but the concept is pretty universal. You disable as many of the variables that can change AFRs, like DFCO and COT, set your PEs the same accross the board, set up your histograms to read your AFR errors from your wideband and go. The devil is in the details, yes, but once the concept of what you are trying to accomplish is understood, the details are fairly easy.

If you are new to HPTuners, the most important thing to do is to learn the scanner. It is a lot more powerful than most think at first. Learn how to acurately read the results that you want to read and how to apply them where it counts. It's really a cool bit of software.

 

You can not tune the VE table on the LE5, so you never wnat to fail the MAF. Like said efore the process is pretty universal. Right now I have CAT disabled and while tuning I filter out anything from the PE and DFCO.

 

What do you do with your PE??? If you're saying what it sounds like you're saying I hope you don't tune WOT that way.

 

What do you mean, VE and PE are two differnt tables. You set your PE table to were you want and and then tune the MAF to make sure the fuel is right.

 

I get that. From what you said, it sounded like you disable PE or something when you are tuning. Do you mean you filter out the PE in the histogram? Sorry, you confused me for a second. If you filter out the PE from the histogram, how do you tune WOT? Also, you should disable DFCO rather than filter it out, don't you think?

 

Sine I dont have a wideband, I use filter in my histogram to filter out, anything form PE & DFCO. I have thought about turning it off, but have not done so yet.I am still researching it some more. Alot of differnt opions on it.

 

You cannot tune PE without a wideband. As soon as you go into PE, you are forced into open loop, the STFTs go to 0% and your LTFTs lock in at the % they were before entering PE. For instance if your at 4% LTFTs when you go WOT, as soon as you hit PE that 4% trim will follow you all the way to RL or untill you are out of PE. You can change the MAF values in those ranges all you want. It will have no effect that you can see without a wideband, which means that you run the risk of doing serious damage to your car.

 

I know thats why I have a conservative tune, and have to check it out on a dyno.

 

Okay, cool.

Sorry for the threadjack, Mike. Did you get what you needed?

 

I have been talking to BennyHHR on HPT's forum and he has been advising me on what to do.

Yeah, my bad on the threadjack

 

i have the basic cabe setup. all of the software is the same. you just don't get the option of datalogging without the laptop, or feeding a wideband signal into the box. there are other ways of doing this, it just thows things off when you do it. my advice. get the pro box.

 

^^x2

 

yea i believe im beginign to understand this a bit more...this would be along shot and im not even sure if it can be done...not sure if i saw this on hpts site or not...but can anyone post of some screen shots of what you all are talking about...just so i can kind of see on the screen what is going on in the prgram itself?...thanks sjs for the help so far

 

Well, there are some screen shots on the other post I sent you to. It's a sticky called "1st setup injectors..." in the tuning forum.

...and you are welcome.

 

What screen shots do you want?

here are the MAF low & high tables and also a screen shot of my PE table

 

Wow, you guys get WAY more MAF cells than me! I only get 1 table to play with.