1toofastlt1

iTrader: (4)

I have a 97 camaro lt1 with a v7 ysi. My question is if I'm going to dd my car what would perform better, a speed density tune or a maf tune? I want to be able to drive the car anywhere without any issues.

dschmittie1

iTrader: (64)

Iknow lots of SD tuned cars that are daily driven and driven all over the place.

Sweet_SS

SD all the way. My last two vehicles were tuned on SD.

ToxicWS6

Not tryin to thread hijack but very interested in same question, but with ls1, what all is needed for a SD tune vs maf, 3 bar map?

dschmittie1

iTrader: (64)

All that is needed for a SD tune is either a 2 bar of 3 bar map depending on what OS you want to put in th PCM.

I am currently running a 2 bar map and have a 2 bar OS from HPtunners in the car. I will be switching to a 3 bar Map and 3 bar OS over the winter

Sweet_SS

^^^ I'm with this guy. I to am running the GM 2 bar map. I also have HP tuners and am on the 2bar OS.

onfire

iTrader: (17)

I run both. Over 580ish enging hp , SD rules IMHO. Under 580, I still use a maf.

Preston99WS6

iTrader: (7)

I run the 3 bar EFI live OS, car runs great on the street.

BottleFedZ346

iTrader: (17)

Another vote for SD!

1toofastlt1

iTrader: (4)

if its in SD does it matter if I tune at sea level then head up the mountain for the weekend. I heard it might run bad

1sick-Z

iTrader: (3)

I run SD as well. I have no issues besides warmup. It starts looking for a MAF and runs like crap the 1st 5-10 seconds of startup than finds idle.

Other than that I am more than happy with it.

89ROC-Z

iTrader: (11)

SD is fantastic. It's all in the ability of the tuner to get it correct. With a maf you either have a huge restriction, or buy a $$$ maf. With SD you can have 4" all the way. Only restrictions in my intake setup is the IAT sensor, and a n2o nozzle

JaYZeig

iTrader: (11)

my trans am has a 3bar sd tune, cant even tell it dont have a maf.

1toofastlt1

iTrader: (4)

Do you guys ever drive in high altitude compared to where it was tuned?

1toofastlt1

iTrader: (4)

Also if I go SD will I need a 2bar or 3 bar map sensor? I wont run more then 20psi. Does anyone have a part number

ibex37

iTrader: (6)

im interested as well, any one with input about driving at sea level and taking the car to a higher altitude?

Adam86

iTrader: (10)

2 bar SD tune on mine. Running great so far! A good tuner is key.

milkplus

iTrader: (3)

A bar of pressure is roughly 14 PSI (atmosphere at sea level).

0 PSI of boost would be roughly 1 bar. 14 PSI, 2 bar. 28 psi, 3 bar.

At least that's the way I understand it. I'm not sure if there's a 2.5bar OS but you're probably better off starting with the 3 bar.

If you have a 98 ECM like me, you're stuck with the 2 bar OS (at least through HP).

wheeljunky

Actually a 2 bar will read -14.7 to 14.7psi . Your car has vacuum till you go into boost. A 3 bar is from -14.7 to 29.4 psi.. like you i have a 98 PCM. 2 bar is the highest i can go. I'm running 15 to 18 pounds of boost. but i can never hold my foot into it to ever see those numbers.

KILLER-LS1

iTrader: (18)

btw, you can get a 2 bar to fit in the factory spot, the 3 bar sensors do not. You just run a vac line to the sensor and zip tie it somewhere

Im on a 3 bar SD tue and still get 20+ mpg