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Pfc D Jetro Opinions

icydude

By icydude,
in Engines & Forced Induction

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paulr33 Grand Master

paulr33

Posted
Posted

there is no logical reason a djetro vs ljetro would make more power or response. if anything the afm should offer better response and load points as its measure air volume and not guessing via pressure

2443 Apprentice

2443

Posted
Posted

My English is not good enough for you. But there is reason L-jetro is much better than D-jetro. D-jetro is pressure measure that means for exsample same pressure tires, one is big truck tire and another is small car tire. Both of them are same pressure but air capacity of the tire is diffrent quantity. There are many logic which one is better and many people, even engineers told about it much. Some people said "Show me show me how do you prive it?" But all logic is so far and coming new always.

CruiseLiner Mentor

CruiseLiner

Posted
Posted

dont forget your limited to 2bar boost and under with the d-jetro with the map sensors they use, if u plan on serious power remember this before u spend your cash :rofl:

i dont know of anyone who has modified a 3 bar map sensor to work with the djetro as yet, i do know one shop who has been trying to do it for a long time and im pretty sure they havent worked it out.

go a full standalone ecu like motec, autronics, etc and u will be very happy with the results and they have internal datalogging, and antilag and all the stuff u could possibly ever want.

thats just my 2c

700HP-GTR33 Mentor

700HP-GTR33

Posted
Posted
dont forget your limited to 2bar boost and under with the d-jetro with the map sensors they use, if u plan on serious power remember this before u spend your cash :rofl:

i dont know of anyone who has modified a 3 bar map sensor to work with the djetro as yet, i do know one shop who has been trying to do it for a long time and im pretty sure they havent worked it out.

go a full standalone ecu like motec, autronics, etc and u will be very happy with the results and they have internal datalogging, and antilag and all the stuff u could possibly ever want.

thats just my 2c

$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$

Just my 2c :P

saliya Rising Star

saliya

Posted
Posted
there is no logical reason a djetro vs ljetro would make more power or response. if anything the afm should offer better response and load points as its measure air volume and not guessing via pressure

Charles' law (sometimes called the Law of Charles and Gay-Lussac) is one of the gas laws. It states that at constant pressure, the volume of a given mass of a gas increases or decreases by the same factor as its temperature (in kelvins) increases or decreases.

That is, you're not 'guessing' an air volume if you know it's pressure (measured by MAP sensor) and its temperature.

Regards,

Saliya

icydude Community Regular

icydude

Posted
  • Author
Posted

I dont see any reason why a gm 5 bar map sensor or 4 bar could not be adapted to work.

You can program 5 differnt including the stock on it comes with.

Just like as if you were using the l jetro with diff afms.

The sensor is just sending an electronic signal which you can interpret to mean anything really.

But as said before an extra grand wont break the bank but when it comes down to it all i need to ignition and fuel. I just dont want to go spend 6 grand on a full motec setup when a pfc "should" work.

paulr33 Grand Master

paulr33

Posted
Posted

just an update, moving to a higher rated map sensor is easy

the rxr7 guys do it quiet often when they crank the boost up

you need datalogit to edit the map scale and offset

two text boxes and its done

paulr33 Grand Master

paulr33

Posted
Posted
Charles' law (sometimes called the Law of Charles and Gay-Lussac) is one of the gas laws. It states that at constant pressure, the volume of a given mass of a gas increases or decreases by the same factor as its temperature (in kelvins) increases or decreases.

That is, you're not 'guessing' an air volume if you know it's pressure (measured by MAP sensor) and its temperature.

Regards,

Saliya

ok but if i have car tyre with air at 30psi and a truck tyre at 30psi

both have same air temp, clearly they both have different are volumes

i cant see anywhere in the datalogit of powerfc to support that it uses the air temp for "load" calculate, the load axis guesstimation is based on map sensor signal and thats about it. it doesnt use the air temp for placement, but more for correction when its really hot (back off timing). i would the map sensor to be temperature aware, but unsure if it would use this value in showing "air pressure" to the ecu

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