1jz fuel cut defender

[pete05]

i just bought one from ebay in the states, got it for $130 delivered.

[ripfast]

is the DIY fuel cut where you use a diode?

[JZA70 R]

1j map sensor reads to 15psi 5v

No it doesn't it reads to 1.16 kg/cm2 (16.5 PSI) @ 4.912 mV

[Wildsupra]

No it doesn't it reads to 1.16 kg/cm2 (16.5 PSI) @ 4.912 mV

Awesome info, i was about to bust up a post to see if anyone knew the exact figure

kinda safe to say that a 1jz mines ecu is probably tuned to the full reading of 16.5 psi then....after that its gunna start leaning out i spose.

[Dieseltrain]

I was running my FCD at 4.2Volts @ 15psi it made 225rwkw with stock dumps and a shitty cat. It ran a best of 12.47 @ 109.8mph on Et streets @ 17.8psi. After installing DUmps + a new Catco Metal cat and new coil packs, I have managed 12.18 @ 113mph witht he FCD at same voltage( bumping off the limiter also) And only runnin 17psi thru 1st and 2nd gear before running 17.8psi thru 2nd and 3rd..

Now i have a Blitz Access ECU so no more FCD. Cars going on Dyno this week after the Greddy Ex cam gear is installed and dialled in. Will get a new power run at 15.5psi and probably 18psi.

But it goes to show how far a simple FCD + stock ECU will go. Got me bloody far thats for sure.

[NeoNasty]

I have built a Jaycar FCD. Its been sitting around not being finished for about 1.5 years.

I finished it and after some trouble shooting its running great on the bench. I'll do a bench test and clamp it to 4.3 Volts and see what happens when its in the VN. I never hit boost in the Soarer as its stock. I dont even have a boost guage in it.

You'll have to wait untill the VN is running.

[lexsmaz]

How hard are these Jaycar FCD to build ? & Installation just cut into the map signal line to the ECU i presume ... At Jaycar are they sold under the name FCD ... Sorry to ( some poeple ) for the obvious / lame questions, but i have never seen one..
These aftermarket electronic mods are still a bit new to me, something i have never dabbled with in the past ...
Thanks in advance ... Rob ...

[TTMX83]

This is the DIY FCD in my Cressida:



It has been working fine for over six months and its adjustable. I'm sure some time on a dyno would fine tune it more and come up with similar results to using and expensive aftermarket type. For now though, I can run 16psi and have had no trouble.

And also a question: Do we measure the voltage with the car running or when it is on boost?

Cheers Brad.

[lexsmaz]

Not sure if i'am reading this above diagram properly, but would that just adjust overall voltage through the range? I was after something that capped the maximum voltage only..
i dont know how its done but sure there was mention of it in here ..

[rob_o]

This is the DIY FCD in my Cressida:



It has been working fine for over six months and its adjustable. I'm sure some time on a dyno would fine tune it more and come up with similar results to using and expensive aftermarket type. For now though, I can run 16psi and have had no trouble.

And also a question: Do we measure the voltage with the car running or when it is on boost?

Cheers Brad.

Awesome work brad... I did this and it cost me a grand total of $2.05 and I have spare diodes.

I am running 20psi on factory ECU and injectors with no problems!

[Ribfeast]

I built and fitted that FCD to a guy's car too, worked like a treat. Just dial in the pot until it just defeats boost cut.

[pete05]

I just discoved my boost controller has a fcd set up in it so i didnt even need the hks one