Boost referenced FPR for M90?

[Mattmannz]

That seems like a massive amount of pressure!!

Without sounding like a newb... with an M90, I assume one side has vacuum and the other has boost. Before the charger is vacuum and after is boost?

When connecting a rising rate reg or a boost gauge I assume that I need to plumb into the manifold side to get boost instead of vacuum?

Cheers
matt.

 

[rms]

Steve,
Have you checked actual fuel rail pressure with a gauge ?
I am pretty sure the injectors will not open at that sort of fuel pressure, unless you are using piezo injectors.

 

[stevechumo]

Steve,
Have you checked actual fuel rail pressure with a gauge ?
I am pretty sure the injectors will not open at that sort of fuel pressure, unless you are using piezo injectors.

I haven't checked the fuel pressure yet, but I'm sure the injectors open fine. I've been monitoring the A/F with a wide band AEM gauge and it's very consistent with the correct ratio.

Mattmannz,
I think you can get the vacuum source after the M90 in the manifold. It'll be positive boost if you boost, that means when you floor the gas and the M90 suck in more air than the vacuum. When you release the gas or in cruising, it's in the vacuum mode. If you install the boost gauge in the intake manifold, it'll show when it's under boost or vacuum.

 

[4000GT]

My thoughts on adjustable and non-stock fuel regulators. Why bother at all, its just for show. Get properly sized injectors and an ECU to control fuel... and youre done.

 

[stevechumo]

My thoughts on adjustable and non-stock fuel regulators. Why bother at all, its just for show. Get properly sized injectors and an ECU to control fuel... and youre done.

You're right, but the tuning part is not easy and expensive. For low boost, a hf-hp 255 lph fuel pump and the FMU are just as good.

 

[XR8tt]

You're right, but the tuning part is not easy and expensive. For low boost, a hf-hp 255 lph fuel pump and the FMU are just as good.

And can be very expensive on engine components when tune goes wrong.. Its NOT if but when...
I think you will find over 80Lb ? Injectors turn into jets.. At this level the FMU just dumps fuel. There's ecu control giving bad fuel economy, emissions..

 

[4000GT]

You're right, but the tuning part is not easy and expensive. For low boost, a hf-hp 255 lph fuel pump and the FMU are just as good.

Yeah sorry I just dont think its as good. You dont have the control you get when you go aftermarket, unless you change your chip and burn a new one. Some shops do this, not that I have seen on the 1UZ yet though.

 

[Mattmannz]

I appreciate all the responses here but I wish people would stop saying that an aftermarket ECU with bigger injectors is the best way to go.

Clearly a new ECU install and tune is the most optimal way to go but you are looking at at least 3k NZ for a semi reasonable ECU, installation and tuning time.

For the 6 PSI that I plan to run now I know it can be done without an aftermarket ECU and I will accept the compromises that go with that. I am installing a wideband setup so when I run it on the dyno I will know exactly how rich or lean it is running. If the stock setup with an aftermarket reg is able to keep it just rich enough then that's all I need for now. I will live with the fact that there might be more power or more economy or less emissions to be had with an aftermarket ECU.

Thanks again for the replies and I am still after more feedback from those who are using rising rate regs - pics of installs and setup info would be great.

Cheers
Matt.

 

[4000GT]

Save yourself the money, dont install the WB setup, the dyno tuner will have one on the dyno.

Good luck with the setup.

 

[Mattmannz]

I have access to a new dyno install, a dynopac 2 hub setup.

It hasn't been fully comissioned yet so there is no tuning gear yet, just the dyno so I need a wideband - free dyno time so it's offset a bit.

Thanks.

Matt.

 

[4000GT]

Oh ok cool, my flatmate has a dynopac 4 hub setup, seems to work pretty well. You might want to look at getting something to detect knock if they dont have any tuning gear.

 

[Mattmannz]

I was going to chuck a scope on the factory knock sensors.

If anyone has any suggestions in this area please let me know.

Cheers
Matt.

 

[4000GT]

KnockLink.

 

[scotturnot]

I ran 7lbs boost on a stock fuel system and ECU. using two AEM widebands (1 left, 1 right) it was perfect. I think for 6lbs it will be fine. Others may have different results but this was mine.