switching from maf to map sensor anyone know how

[egamarine]

Hey guys I want to switch from a maf to a map sensor on my rb just wondering if this would be beneficial and how to go about doing it

[toadx8u]

The only way is to go with a management that runs on map...ie: haltech p2000, aem, power-fc djetro...it would be very beneficial since the map is more accurate then maf on boosted applications

[Sil240]

You can find a old HKS VPC.

I've always heard MAF was more accurate measurement of air than MAP?
Also do they take in account for Altitude and temp????

[meet07]

Emanage Ultimate

[Nesquick]

personally, im stickin with my MAF sensors.

THE REASON: on map converted engines, its based off of a fuel curve that is programed into the ECU and it does not change.
so basically, your fuel map never changes. no matter what the air conditions are outside (dense, thin, wet, dry, etc).

but on MAF sensors, it calculates the density and adjusts the fuel map per according to the air conditions.

ill give you a scenario.....

two EXACT same cars, one map, one maf, get tuned at the same place at the same exact time. next they decide to go on a road trip high up in the mountains and do some crazy awesome tokyo drift style drifting on dem uber awesome mountain roads. but as we all know, air is thinner up high in the mountains. the MAP car cant adjust its fuel curve for the lower density air, while the MAF car can. So in the end, the MAP car is still stuck high up in the mountains rebuilding its engine from having improper fuel delivery, while the MAF car is at the bottom of the mountain where he is now crowned "DK" and all his friends love him.

Pretty much what iv said is from posts and other forums that i have gathered and tried to make sense of.

if someone wants to confirm or deny this, or even add a thing or two be my guest.

[Ramius83]

personally, im stickin with my MAF sensors.

THE REASON: on map converted engines, its based off of a fuel curve that is programed into the ECU and it does not change.
so basically, your fuel map never changes. no matter what the air conditions are outside (dense, thin, wet, dry, etc).

but on MAF sensors, it calculates the density and adjusts the fuel map per according to the air conditions.

Most MAP based Engine managements use Air intake temp sensors to correct for these conditions. From the Haltech Manual:

"Inlet Air Temperature Sensor
The air temperature sensor is used to compensate for changes in air density due to air temperature. Cold
air has a higher density than warm air and therefore requires a greater volume of fuel to maintain the
same air/fuel ratio. This effect is most noticeable in forced induction engines. The Haltech ECU will
automatically compensate using the signal received from the air temperature sensor (once the air
temperature correction map is setup and enabled in the programming software)."

[Carl H]

dont forget that most 'good' ecus also have a barometric sensor to compensate for atmospheric changes...

however, stock management works very well for the application so until i run out of loadpoints i'll keep my stock ecu.

[Nesquick]

i stand corrected.

but question..... why does an RB26 have a stock AIT sensor AND have MAFs? (just for my personal knowledge, no intention of thread jacking)

[egamarine]

Thanks a lot guys that's pretty much the route I figured you would have to go but thought maybe some of the rb gods would give me a peek in to a window I didn't know about. That is weird having a ait sensor and a maf, though?

[RustspecS13]

No, the computer still needs to know the temp regardless, to make sure the timing is changed when it gets hotter/colder air temps.

~Alex

[eh?]

personally, im stickin with my MAF sensors.

THE REASON: on map converted engines, its based off of a fuel curve that is programed into the ECU and it does not change.
so basically, your fuel map never changes. no matter what the air conditions are outside (dense, thin, wet, dry, etc).

but on MAF sensors, it calculates the density and adjusts the fuel map per according to the air conditions.

ill give you a scenario.....

two EXACT same cars, one map, one maf, get tuned at the same place at the same exact time. next they decide to go on a road trip high up in the mountains and do some crazy awesome tokyo drift style drifting on dem uber awesome mountain roads. but as we all know, air is thinner up high in the mountains. the MAP car cant adjust its fuel curve for the lower density air, while the MAF car can. So in the end, the MAP car is still stuck high up in the mountains rebuilding its engine from having improper fuel delivery, while the MAF car is at the bottom of the mountain where he is now crowned "DK" and all his friends love him.

Pretty much what iv said is from posts and other forums that i have gathered and tried to make sense of.

if someone wants to confirm or deny this, or even add a thing or two be my guest.

Did you know a lot of older maf equipped cars had either an external barometric sensor or internal sensors in the maf?..
I've read a bit about map sensor and altitude correction, I've read map sensors are self correcting and I've read you should use the baro sensor. But I've also read the fueling %change from sea level to a couple thousand feet is small and a baro sensor is not really needed.

There are a lot of cool features to be had using map and so much easier to tune, I would never ever go back to using maf in a fully modded car.

[Carl H]

ive come to the conclusion that the rb26 uses an AIT due to the ITB setup...pure speculation but i guess that due to the itbs it relies on it for fueling correction.
its very odd tho, if one were to compare the rb26 base map to an rb20 map they are SOOOOOO different its not even funny.
the rb26 map reminds me of maps that are designed on ecus that run on MAP sensors even tho it is definately a MAF based car.

[240cp]

For the sake of discussion pretty much all of nissan's cars and trucks have maf sensor's and right along side of that is a iat sensor. It is not specific to the rb26. I dont know why i am just mearly pointing it out.

[Carl H]

modern obd2 cars yes, but older cars using the older eccs...no.

[RustspecS13]

The sohc KA's I know have a iat sensor (the later lower compression ones), and Ive never really paid attention to dohc's but next time I hang out with my friends I'll check it out. I do know a few eccs setups use it, its not quite cut and dry they all do/do not use the iat.

~Alex

[Carl H]

ah, true i forgot about that the ka has IAT sensors...rb20/25 sr20,ca18 do not.

[SullivanRacing06]

if your interested im selling a microtech lt-16 that has a wiring harness already made for any rb motor, it has a map for a 78mm turbo and 720ccs,also has the upgraded 3 bar map, bought it new for 1500 a few months back, willing to sell for 900 shipped. this eliminates the maf and allows you to run the built in map ...

lmk

[rb25det250sx]

Haltec plug and play fro the RBs have a built in MAP

[SullivanRacing06]

the microtech has one built in the ecu. and its the upgraded 3 bar instead of a 2 bar