Ed Wright

iTrader: (1)

I don't think a lot of them understand that.

MontecarloDrag

iTrader: (3)

And some of them can cause dangerous things or permanently damage the PCM if a wrong value is entered

Slowhawk

iTrader: (12)

I prefer using the maf most of the time.

Sd is used by us mostly on turbo, supercharged or very big camed cars. When in sd we shut off the 02's too. Have many cars tuned liked that and have been for a long time with no failures. So I'd say it can be safe.

Ed Wright

iTrader: (1)

Yeah, other than the wrong value damaging the PCM. Your mistaken there.
They have done a pretty good job of dumbing their software down for general consumption.

joecar

lol... which part of it...? :^)

joecar

Ok, no worries... I was using your post as a platform :^)

joecar

Not just the missing variables... we don't have access to the algorithms tying the known and unknown variables together.

joecar

Something not mentioned yet:

running SD means a MAF DTC has to be present... this disables HO/LO adaptive spark and defaults to the LO spark table.

Ed Wright

iTrader: (1)

Many very simple and very useful. If you knew what you aren't seeing, you would wonder why they were left out.


More to it than that.

joecar

Yes, I have an idea, but I don't have the means to dig deeper... and I already really do wonder why they're not all just simply included.

Yes, there would be more (of which I admit I don't know enough of)... but one of the side-effects is the transmission line pressure calculation (especially when from the factory, for some vehicles, the MAF DTC's are turned off in the trans fault tables), an unsuspecting software user can end up with a burnt trans...


Edit: reworded because I couldn't understand my sentence... you'd think I was English deficient...

96redcamaro

iTrader: (1)

So is it true that in a boosted application you must use SD?

Ed Wright

iTrader: (1)

Only is some people's minds.

CALL911

iTrader: (17)

You clearly have not read this short thread at all.

"No" you don't have to use SD in boosted cars.

96redcamaro

iTrader: (1)

The only place in this short thread where i see that you dont have to use a MAF is here

I'm sorry but that just isn't enough for me.

Thank you.

CALL911

iTrader: (17)

Nowhere in the thread does anyone say you have to have SD tuning on a boosted car, nor does anyone hint that you would.

In fact I think Ed has made it clear he still prefers MAF tuning in boosted cars.

SD tuning is what a lot of guys use just because it doesn't take as much effort after the MAF is maxed (as I said in my post that seemed to confuse you, or you needed more info on).

Once the MAF is maxed, a tuner will need to adjust and compensate for the PE tables that are no longer being read. It definately can be done though (its been done to my car several times successfully).

96redcamaro

iTrader: (1)

That might be a hint

It did not confuse me, no need to make personal attacks. i just wanted to be more sure and get more info.

Thank you for your response. I'm sorry if i offended you some how.

Ed Wright

iTrader: (1)

I have to wonder who told you the PE table is "no longer being read" after the MAF maxes? Absolutely false. Blower cars have a predictable boost curve. Turbo cars, often not.

CALL911

iTrader: (17)

Perhaps I misspoke, what I meant was that data was needed to be input past when the MAF was maxed.

CALL911

iTrader: (17)

It seemed to me this question was more obvious and covered in the thread. I would consider; "you clearly have not read this short thread" more or less telling you to read through the thread first more than a personal attack.


At any rate; now that this thread is officially off topic, I would like to open it up for more people to input info on MAF vs SD tuning.

Ed Wright

iTrader: (1)

Since belt driven blower's boost are RPM related, it is no big deal to fuel them past the MAF maxing out.