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.

 

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

 

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

 

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?

 

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

 

^^^ 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.

 

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

 

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

 

Another vote for SD!

 

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

 

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.

 

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

 

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

 

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

 

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

 

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

 

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

 

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).

 

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.

 

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