[LJZ]

In the New Year I am planning to spend some time upgrading to BPU.
I would like to raise the boost to around 18psi. To do this I understand that I need to buy a Boost Cut Controller (Defender) BCC to remove the safety feature which limits the soop at 14-15psi. And then also get an electronic boost controller.
Can anyone tell me if it would be a bad idea to fit a BCC unit before installing a boost controller? I am worried that if I remove the safety over boosting feature that the car will spike and over boost. Is this possible on a stock 2jz GTE?? The only mods so far are 3.5" catback (no dump pipe or high-flow cats yet) APEXi pod and 600 x 300 x 80 FMIC. Or is over boosting impossible without more mods.
I am also looking into boost controllers and quite like the Turbosmart e-Boost STREET http://www.boostcont...=1&category=264
As well as the GReddy Profec B Spec Type 2
http://www.suprastor...prbspty2el.html
Has anyone used these units before, any feedback or reviews on them would be much appreciated.
Cheers, Luke

[--Golli]

My personal opinion, using any sort of boost cut defender of any sort is stupid. Boost cut is there to stop you pushing the injectors past thier range. Its a safety measure that you should only removed when you install an aftermarket ECU (not a piggyback).

There are ways to raise boost cut, Bigger injectors and a piggy back are usually needed, but as for specifics, you'd have to ask someone with experience on the 2JZ.

As for boost controllers, I've heard good things about the Profec B. It's also quite similar in function to my HKS unit which I rate highly.
The Turbosmart one looks quite basic, and I havent heard anything about them, so I cant comment.

[LJZ]

--Golli, on 21 December 2010 - 06:30 PM, said:

My personal opinion, using any sort of boost cut defender of any sort is stupid. Boost cut is there to stop you pushing the injectors past thier range. Its a safety measure that you should only removed when you install an aftermarket ECU (not a piggyback).

There are ways to raise boost cut, Bigger injectors and a piggy back are usually needed, but as for specifics, you'd have to ask someone with experience on the 2JZ.

As for boost controllers, I've heard good things about the Profec B. It's also quite similar in function to my HKS unit which I rate highly.
The Turbosmart one looks quite basic, and I havent heard anything about them, so I cant comment.

Good to know, I was thinking an aftermarket ECU but only much further down the track.
I think (and may be wrong) that the way the boost cut works on the 2JZ is there is a air preasure sensor attached to the intake near the throtle body which converts PSI into voltage. Once the voltage reaches a certian point determined by the PSI, 2JZ being 14-15psi the computer interperates the higher voltage as overboosting and enables fuel cut until a point where the voltage drops below the predetermened amount. meaning psi dropping.
The BCC I am looking at is ajustable so I think that I can turn it up to still have a cut out, for example 18psi or whatever and then at the same time have my boost controler which would prevent spiking anyways.
Ahhhhh so confusing, last thing i want is an overboosting beast on my hands and then kaboom bye bye soop hello scrapyard. cheers for the imput dude

[ultra_supra]

the JZA80 2JZ-GTE factory boost cut is around 16psi from memory, but my factory computer would only catch my boost rise at ~17.6psi (call it 18psi for practical purposes)

When Reaper and I fitted the Greddy BCC to my car, my overall boost ceiling remained around 18psi so the BCC didn't really make a difference - if anything it then exposed my car to boost spikes (21psi+) as I don't run a boost controller... which probably contributed to the eventual failure of my turbos last year.

If your current system cuts out at 14-16psi and you want to run a BCC which is adjustable, then you should set it at 18psi (to be safe) and use an electronic boost controller to smooth it all out.

HKS, Apexi (if you can still get them) and Profec B are quite good options. Turbosmart EBC is probably fine too.

[LJZ]

ultra_supra, on 22 December 2010 - 09:19 AM, said:

the JZA80 2JZ-GTE factory boost cut is around 16psi from memory, but my factory computer would only catch my boost rise at ~17.6psi (call it 18psi for practical purposes)

When Reaper and I fitted the Greddy BCC to my car, my overall boost ceiling remained around 18psi so the BCC didn't really make a difference - if anything it then exposed my car to boost spikes (21psi+) as I don't run a boost controller... which probably contributed to the eventual failure of my turbos last year.

If your current system cuts out at 14-16psi and you want to run a BCC which is adjustable, then you should set it at 18psi (to be safe) and use an electronic boost controller to smooth it all out.

HKS, Apexi (if you can still get them) and Profec B are quite good options. Turbosmart EBC is probably fine too.

Awesome, exactly what I needed to know. In light of this I will get a boost controller first and see how far the factory cutout will take me, if I want higher then I will go for a BCC with adjustable voltage to avoid spiking.
Cheers for the help guys