Boost Pressure Sensor In R34

[Bayside Blue R34 GTV]

Does anyone know whether r34 25gt has any type of sensor built in that reads vacum and boost pressure? or does it only exist on the gtt?

[zebra]

They will have a Map sensor, but only a 1 Bar jobbies, so will only read vacume iirc

[Bayside Blue R34 GTV]

They will have a Map sensor, but only a 1 Bar jobbies, so will only read vacume iirc

so the r34 na can actually read boost up to 1 bar?

[mad082]

pretty sure they aren't a proper map sensor in the same way that other aftermarket ECU's will use them. the car will run without it since it uses the AFM to get fuel mixtures. i think they are more of a boost sensor.

easy way to see if the NA has one though is to have a look for it. pretty sure on the r34 it's on the firewall (in the centre. but then it is friday arvo and 33 degrees so my brain may be short circuiting and making stuff up). shouldn't be too hard to spot. a little box with a vaccum line going into it and wires coming out

[zebra]

so the r34 na can actually read boost up to 1 bar?

No they read vacuum, a 2 bar map sensor reads up to 1bar boost

[paulr33]

i think only the GTT would have this sensor, it would be a standard 2 bar map sensor

its used by the ECU to watch for excess boost and then when it detects excess boost, it probably cuts fuel and timing

i see no reason why the GT N/A would have this sensor. as zebra said, map sensors have a single rating, ie 2 bar map sensor, but they read 1 bar vacuum and rest is "boost". so a 2 bar map sensor reads to 1 bar boost. a 3 bar map sensor reads to 2bar boost etc.

[zebra]

Paul I dare say you are right about the NA not having them. The R33 Gtst's have a 2bar sensor for the factory boost gauge as well.

[Bayside Blue R34 GTV]

anyone know where its located, eg a picture or something. as my tuner is trying to figure out and replace it with a one that reads boost if have to so the pfc can understand

[mad082]

the PFC shouldn't use it or need it. PFC should only use the AFM signal.

as for where it's located (if the natro has one), attached to the firewall, almost directly about the rocker cover.

found this pic with a quick google search

[Bayside Blue R34 GTV]

ok then. doesnt look like there is one on the na. then the question will be how can i make the pfc controller to show boost pressure then. as i was thinking just simply replace the 1 bar map sensor(wherever it is) on my car with the 2 bar one off the turbo one.

[mad082]

you will need the proper map sensor for the PFC boost controller kit. may i ask why you want the PFC to show boost? the PFC doesn't need to read boost to operate so you can run it without it. it only needs to read boost if you are using it to control the boost, in which case the controller kit should have everything you need.

if you do really want to run it then have a look here at some info by a member of sau called paulr33. that way you can display boost on the hand controller, but remember that it doesn't do anything with that info. it doesn't alter the tuning or anything like that based on it.

http://www.paulr33.com/powerfc-faq/powerfc-faq.htm#51

be easier to just go and buy a boost gauge though.

[Bayside Blue R34 GTV]

ok thanks. ill explain to my tuner tomorrow about the boost sensor thing does not effect how the pfc runs. and the reason i want to show boost on the controller is because i wanna know what psi ts running without having any gauges in the car.

thanks for the info guys

[xALmoN]

maybe you should go to another tuner?

[Bayside Blue R34 GTV]

lol. i think my tuner might got confused abit. but yea, its at a very reputable shop, i really feel safe having my car with them. they might specialise in subys but still knows abit of skyline. guess he just got confused when i brought up about the boost sensor question and thinking that the pfc reads off the sensor rather than the afm. anyway, ill confirm with them tomorrow and hopefully the car will be ready by thursday. fingers crossed.

[xALmoN]

well, good luck with that... =D