to MAF or not to MAf that is my question
The reason that maf tuning is safer is because the maf has a thin wire in there that heats up and it uses the outside air to cool it in order to see how much air is introduced. In FI application this is only good up to a certain point because you have air rushing in faster than the maf is able to read. That is why you go to a SD tune or Speed Density where it reads the amount of air is entering it but when the variables like elevation and humidity change very quick you have to tune for that because it is only looking at the SPEED of the incoming air... Yes there's a IAT sensor and it's totally seperate...It's usually on your lid if I'm correct or somewhere around there...
So the IAT sensor does nothing to adjust your mixture when you're using a MAP only setup? Is there any way to configure the MAP setup to adjust for changes in temperature, etc?
not really man...That's why many guys have different tunes for different weather conditions or elevations...A maf can tune pretty far though...I'm pretty sure that KP is still running one and he's in the 9's...
Originally Posted by Country Boy
read the turbo FAQ biotch 
Its the last post 
Its the last post shut up
that helps with the first part of my question
still dont know what MAF is the best?
oh he buys his first turbo kit and now he is a expert!
just kidding
Last edited by SINISTER; Jun 7, 2006 at 08:06 AM.
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Originally Posted by MiaSSmaro98
hp tuners offer a new file u can download to 2 bar or even 3 bar conversons for the 98 ecms so i got one worried off my head
Originally Posted by 98turbls1
You can get a 3 bar map from a typhoon or syclone... You can get better throttle respnse from a SD tune but if your temps change a lot where you live then I would tune with a maf...
Originally Posted by Slowhawk
Going 2bar or 3bar won't give up any drivability.
no idea why youd keep the maf...go 2/3 bar. end of story. if running under 15 psi of boost, you can get a cobalt ss map sensor, plugs right into the lsx intake with no mods and you just plug the pcm harness into it. the 3 bar is trickier as you need an adaptor harness as well as you have to run boost refernce into it, you cant plug it into the manifold.
On The Tree
Joined: Aug 2003
Posts: 151
Likes: 0
I ran MAF-less N/A, and now also with a 2-bar FI setup with methanol. My tune works just fine in cool wet weather, and warm/dry. I can dial in whatever AFR I choose to improve fuel economy at lighter loads and idle. I'll never run a MAF again until emissions time.
Originally Posted by Boostaholic
Just say no to MAF sensors!
ok guys
i will loose the MAF and go with a 3 bar set up...
need to learn more about this ****.. 
i sent a message to leo at gmr speed that shop is the one thats gonna be tuneing this beast
one last dumb question i will be ordering a 3 bar map sensor through jj's automotive
one of these
GM Style 3 Bar Pressure Sensors
Manufacturer Part Number
GM (old)* 16040749
AC Delco (old)* 213-101
GM (new)** 12223861
AC Delco (new)** 213-1562
MSD** 2313
MSD (compact)** 23131
Borg Warner** EC1678
NAPA CRB219481
Electromotive Engine Controls 71130
Holley 538-23
THIS IS all i need this will plug right in where my stock 1 bar map is???
Last edited by SINISTER; Jun 8, 2006 at 07:22 AM.
Will the SD tune ultimately give you more power and its only limitation is to adjust for the atmospheric/weather conditions?
will the tune greatly vary with SD if its tuned for 95 degrees/60% humidity and then you run at night when it drops to 80 degrees at lets say 30-40% humidity.
I'm interested in trying this but our weather changes and I want that safety margin of the MAF.
will the tune greatly vary with SD if its tuned for 95 degrees/60% humidity and then you run at night when it drops to 80 degrees at lets say 30-40% humidity.
I'm interested in trying this but our weather changes and I want that safety margin of the MAF.
SSU Moderator
Joined: Nov 2001
Posts: 4,857
Likes: 0
From: Austin, TX
A true SD tune will not be affected by normal weather changes. Now, if you go from Death Valley to Denver, CO, I can assume there will be some tweaks, but its not a carb. Every OBD1 car was SD. I have no experience with SD-tuning the stock LSx PCM, but in theory you shouldnt have to do much if anything. If its FI, ditch the MAF, period. If you have the money, get BS3, period.
We also have IAT sensors. In stock form they can adjust timing depending on weather. You can even put a resister in the sensor to trick into seeing a certain temp...that's old school.
We also have IAT sensors. In stock form they can adjust timing depending on weather. You can even put a resister in the sensor to trick into seeing a certain temp...that's old school.