animuL

iTrader: (3)

I am considering doing this simply because it would be nice to be able to eliminate the MAF sensor / housing from my car to free up some space to locate nitrous nozzles. From a performance / drivability standpoint what would be the pros and cons of running MAFless?

macca_779

There are no cons to running MAFLESS if its done right and a capable COS is used. Pros are improved throttle response and a power gain due to the removal of the MAF restriction also no need to worry about a dirty MAF skewing you airflow readings. I know its not as common in the states but in OZ we have mastered the process to a point where 90% of modified LS1's are running around Semi OLSD. Back in the day OZ's highest output factory released LS1 came out MAFLESS.. Thats pretty much what started the trend over here.

wait4me

iTrader: (10)

Yup, I dont see any downfalls at all when done correctly.

One less sensor to die or mess things up... I drive maf less cars all year long in -20 to 110 degree weather with no issues... Fuel always goes where it needs to be..

Midnight68

iTrader: (1)

Is a SD tune affected by elevation change. Living in Denver, my weekend cruises I can easily go from 5000 to 13000 feet in elevation. The air gets pretty thin up high is that anything to be worried about with a maf less tune.

wait4me

iTrader: (10)

The ECM does baro updating with the MAP sensor. Not the Maf.

animuL

iTrader: (3)

Thanks for the great info guys... going MAFless is really going to simplify my nitrous setup .

SilverSmoke

Really?!?! How did you accomplish this or are you running clsd? I've had nothing but issues w/ cylinder charge temp/bias doing some crazy things in hot/cold weather.

foff667

iTrader: (2)

https://ls1tech.com/forums/pcm-diagnostics-tuning/509481-advantages-disadvantages-sd.html

Boosted 99 TA

iTrader: (1)

hey i dont wanna hi jack your thread but to do a SD to do you just have to get the 2 bar map snesor from the Supercharged cobalt and just trash the MAF and thats it and the tuner does the rest? or is there anything else i will have to do?

Tuner@Straightline

HP Tuners has a custom OS that works with the stock MAP, and has realtime tuning as well.

M-Ten

iTrader: (2)

Maybe a dumb question, do you need to get a MAP sensor, or just remove the MAF?

SSpdDmon

iTrader: (10)

LS1's come with a 1-bar map sensor located on the back side of the intake manifold. Cars running forced induction typically require a 2 or 3-bar map sensor to run SD full time. So to answer your question - just remove the MAF (physically AND in the PCM).

macca_779

Yeah but it doesn't have VE/IAT factoring so its a flawed OS for running OLSD. EFI LIVE's OS3 or OS5 has everything you need to run OLSD in all weather conditions. Plus its free

foff667

iTrader: (2)

Way to turn a pro's & con's of Speed Density tuning into a hptuners vs efilive thread

geeteego

iTrader: (1)

Sd = F.t.w.

M-Ten

iTrader: (2)

So you don't need a new map sensor - a 2 or 3 bar - if you aren't supercharged/turbo? What about with nitrous?

And what's the difference between a 1 bar and a 2 or 3 bar?

foff667

iTrader: (2)

http://www.hptuners.com/forum/showthread.php?t=9255

M-Ten

iTrader: (2)

oh ok cool thanks. i know it says for n/a a 1 bar is fine, but they didn't mention anything about nitrous.. would a 1 bar be fine too?

Bill Bowling

iTrader: (6)

Yes 1 bar is OK.

Bill

macca_779

Pro's and con's of SD have a lot to do with it though. Using HPT with no IAT/VE correction will result in an SD tune that won't account for weather correction. Thats a pretty big con for going SD. Use EFI LIVE and its not a problem and you have no cons.