Is there any way to run the 440 twin turbo supra injectors with the stock efi? I know how to tune the afm but can I tweak it enough to use them? I an building the engine to run 13 lbs of boost and it needs alot of fuel but are they too big for the car?

 

I did some reasearch on Hybridz.org about the stock 280ZX turbo ECU and bigger injectors ect.

Basically my final word was that the ECU sucks and everything is linear on it and the AFM. If you put in bigger injectors and tune the AFM down or the fuel pressure so that it idles good, then when you are under boost you will not be getting full potential from the injectors. the ECU really doesn't read very many settings to compensate for boost or fuel levels. It is basically hard programed for a certain set of injectors and turbo.

87-89 Turbo Z31 ECU swap is your best bet with those injectors or Megasquirt.

My idea was then to just run the stock fuel system, ECU, and turbo, and add only a good rising rate fuel pressure regulator to the equation. Once I've peaked that system out and want more...

new ECU, new injectgors, fuel rail, fuel pump, turbo... $$$!

 

Just for the sake of a second opinion, bleach is right. The ECU's that came in these car really don't have the parameters built into to them to make changes like that without some kind of assistance. One option is the Z31 system like he said. The next step up is a piggy back system that can alter the injector signal so you can run bigger injectors with the stock ECU and an FPR. Which would save you the headache of having to tune a stand alone system from scratch. Of course the ultimate is stand alone, but tuning isn't cheap if you don't know what you're doing. Theres a system out called the R-500 from PLX Devices. It's a wide band A/R system that'll allow you to tune pretty much any system you decide to install and is much more accurate than the standard A/R gauges and stock O2.

 

Its been said that the stock turbo injectors rarely are used at high duty cycle. You can safely cram more fuel through them with the high fuel pressure method...FYI

 

If you want any power down the road then a standalone fuel and ignition system such as megasquirt is the only way to go. I myself have been looking into Microtech. Megasquirt can be had for only $300 pre-assembled.

 

You can safely run an injector to 80percent duty cycle without having to worry about starvation. So as long as one stays at or below that number then its no worries. That's not to say an injector cant be run at a higher duty cycle. You just start running risks when you start reaching the limits of the injector.

 

can our cars run with safc-2?

Im getting one for my supra beacuse after adding headers intake and exhaust my car runs a bit rich and i want to run this piggy back.

I was wondering if we can use it on our 280zxts?

 

You just wanted to up your post count...hahaha.. But like every one is saying to get full potential go with stand alone..

 

I was reading in a magazine today, they were tuning thier SCCA car with Megasquirt, after converting from SU's...they had the injectors running at 87% duty cycle in the upper RPM's (like 6000-6500). I thought that was a little high, whenever i build up an engine i like the injectors to be no higher that 75%. Going lean has not been good to me in the past lol!

 

I don't think you can use the SAFC-II on our zxt's without upgrading to the Z31 setup and a 240sx throttle body. The stock efi is weird and reads voltage from 5-0 instead of 0-5 like hotwire maf setups do. Also, you need a 240sx throttle body so you can use their little piggy tail piece that's separate from the tps plug because it is a potentiometer that will give the correct throttle position to the SAFC-II. Ours is more like a on/off and doesn't give the correct input.

 

When running higher compression on an n/A do you have to up the fuel pressure with a turbo ECU or will the stock N/A work for 10:1?

 

The ECU does not and can not increase the fuel pressure.

Typically, you use a rising rate fuel pressure regulator that will adjust the pressure based on manifold vacuum/pressure or a tach reading.

 

To answer your question, YES you can still use the NA ECU. ( lww)

Just listen to what lww said while doing it. The turbo ECU is just gonna give you headaches if you even attempt to intergrate that thing. Stock ECU and RRFPR. It'll get you where you're going.