nokeman

iTrader: (30)

...using Speed Density tuning. I mean, even if it only gains a couple horsepower, why wouldnt everybody choose this option. Most people try to squeeze out every last bit anyway right so why not here too??

slow

iTrader: (7)

it is squeezing the last couple bit of hp out of the car.

The disadvantage is you lose some compensation for the tune in different weather conditions, since you are "telling" the computer how much air is coming into the engine, vs calibrating the sensor that measures the airflow coming into the engine get get correct fueling.

Ryan

white2001s10

iTrader: (4)

The MAF compensates a lot for tuning errors.
SD mode does not, so you must do a much more thorough job of getting the tune right. A lot of people don't want to invest that much time.

foff667

iTrader: (2)

& SD mode all the time would require a new tune for each successive mod & a good amount of monitoring on a full time basis not to mention it wont pass the new OBD2 tests at least not that I know of.

nokeman

iTrader: (30)

So its probably not the most or most pratical option for a mostly street vehicle. I want to get every last bit of power out of my car but this almost seems like its not worth it.

horist

^^^ all depends on how much time you want to spend scanning and tuning

I run SD on my TA... but it only sees the street 2.5 seasons a year on nice days and only a few thousand miles

foff667

iTrader: (2)

I always try to dial in the ve/maf tables and throw the car back into closed loop/maf...since the maf can still make alot of adjustments when adding mods. Most people add one thing at a time rather then throwing 10 grand at a car all at once...keeping the maf in play for most is the best way to do it.

Spenser309

you can get the same amount of power out of both a MAF and SD tune(in theory), but the problem is that inorder for a MAF tune to be spot on your VE(SD Tuning) must be dead on. Therefore the amount of time to get a MAF tune is not worth it to most people with a Tuning suite. Thats my take on the situation.

white2001s10

iTrader: (4)

I don't like MAFs and I've never done this myself, but it seems that If you want the ease of letting the MAF take care of things down low, and the maximum power of SD up top then you could ask your tuner to flat line the upper range of your MAF table and do all the WOT stuff in the VE table.
Like I said I've never done this, but I don't see why you couldn't do it.

There's something in the code already to the effect of swapping to fuel calculation at 4000 RPM. I'm not sure yet what that means though. A good tuner could sort it out in a short time in any case.

nokeman

iTrader: (30)

Im gonna have to get my tuner to explain all this to me because honestly, I hardly know anything about tunning and all that stuff.