Jump to content
SAU Community

Pfc D Jetro Opinions

icydude

By icydude,
in Engines & Forced Induction

 Share

Recommended Posts

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

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • MissMintyR33
      R33 persistent issues. P/steering and lag/misfire

      By MissMintyR33 · Posted

      I thought that might be the case, thats what I'll start saving for. Thanks for the info 
    • jtha7
      Strange issue RB25DET wont start

      By jtha7 · Posted

      Ps i found the below forum and it seems to be the same scenario Im dealing with. Going to check my ECU coolant temp wire tomorrow    From NICOclub forum: s1 RB25det flooding at start up Thu Apr 11, 2013 7:23 am I am completely lost on this. Car ran perfectly fine when I parked it at the end of the year. I took the engine out and painted the engine bay, and put a fuel cell with an inline walbro 255 instead of the in tank unit I had last year. After reinstalling everything, the engine floods when the fuel pump primes. if i pull the fuel pump fuse it'll start, and as soon as I put the fuse back in it starts running ridiculously rich. I checked the tps voltage, and its fine. Cleaned the maf as it had some dust from sitting on a shelf all winter, fuel pressure is correct while running, but wont fire until there is less than 5psi in the lines. The fuel lines are run correctly. I have found a few threads with the same problem but no actual explanation of what fixed it, the threads just ended. Any help would be appreciated. Rb25det s1 walbro255 fuel pump nismo fpr holset hx35 turbo fmic 3" exhaust freddy intake manifold q45tb q45 maf   Re: s1 RB25det flooding at start up Fri Apr 12, 2013 5:07 am No, I didn't. I found the problem though. There was a break in one of the ecu coolant temp sensor wires. Once it was repaired it fired right up with no problems. I would have never thought a non working coolant temp sensor would have caused such an issue.
    • jtha7
      Strange issue RB25DET wont start

      By jtha7 · Posted

      Hi sorry late reply I didnt get a chance to take any pics (my mechanics on the other side of the city) but the plugs were fouled from being too rich. I noticed the MAF wasn't genuine, so I replaced it with a genuine green label unit. I also swapped in a different ignitor, but the issue remains. I've narrowed it down a bit now: - If I unplug and reconnect the fuel lines and install fresh spark plugs, the car starts right up and runs perfectly. Took it around the block with no issues - As soon as I shut it off and try to restart, it won't start again - Fuel pressure while cranking is steady around 40 psi, injectors have good spray, return line is clear, and the FPR vacuum is working. It just seems like it's getting flooded after the first start I unplugged coolant sensors to see if its related to ECU flooding but that didnt make a difference. Im thinking its related to this because this issue only started happening after fixing coolant leaks and replacing the bottom part of the stock manifolds coolant pipe. My mechanic took off the inlet to get to get to do these repairs. My mechanics actually just an old mate who's retired now so ill be taking it to a different mechanic who i know has exp with RBs to see if they find anything. If you have any ideas please send em lll give it a try. Ive tried other things like swapping the injectors, fuel rail, different fuel pressure regs, different ignitor, spark plugs, comp test and MAF but the same issue persists.
    • GTSBoy
      Freddy Plenum vs Genuine options RB25

      By GTSBoy · Posted

      My return flow is custom and puts the return behind the reo, instead of at the bottom. All my core is in the air flow, rather than losing some of it up behind the reo. I realise that the core really acts more as a spiky heatsink than as a constant rate heat exchanger, and that therefore size is important.... but mine fits everything I needed and wanted without having to cut anything, and that's worth something too. And there won't be a hot patch of core up behind the reo after every hit, releasing heat back into the intake air.
    • Murray_Calavera
      R33 persistent issues. P/steering and lag/misfire

      By Murray_Calavera · Posted

      There is a really fun solution to this problem, buy a Haltech (or ECU of your choice) and put the MAF in the bin.  I'm assuming your going to want more power in future, so you'll need to get the ECU at some stage. I'd put the new MAF money towards the new ECU. 
×
×
  • Create New...