Jump to content
SAU Community

Recommended Posts

In a nut shell, in basic layman's terms.

The standard R32 GTR ECU is designed to have high impedance injector output.

To run low impedance injectors Nissan used the resistor pack to get around the ECU's high impedance output.

If your running a Haltech, cut and join all the 7 wires at the resistor pack and remove the resistor pack, then select VIA the ECU which injectors you want to run, high or low impedance.

  • Like 1

In a nut shell, in basic layman's terms.

The standard R32 GTR ECU is designed to have high impedance injector output.

To run low impedance injectors Nissan used the resistor pack to get around the ECU's high impedance output.

If your running a Haltech, cut and join all the 7 wires at the resistor pack and remove the resistor pack, then select VIA the ECU which injectors you want to run, high or low impedance.

thanks, is it true low impedance injectors have a faster reaction time over the high impedance ones or is this just horse shit lol cheers

For those wondering what the benefits are, perhaps google up "peak and hold".

It's all about how the ECU drives the injectors and how fast they open as a result.

the only useful information I found at first was pretty dated. stating that saturation-style injector design is maxed at 600cc/min.

Then I found what I was looking for here:

http://fuelinjectorclinic.com/faqs/#1

the common belief which still lingers today (though it is no longer correct) is that low-z injectors are the best for your high performance vehicle.

Today’s high impedance injectors, however, are able to outperform those older low impedance injectors at larger flow rates due to their newer designs, tighter manufacturing tolerances and much lighter moving parts. A valve and spring assembly from a current high-z injector may weigh less than 1/3rd of the assembly from an older injector.

Thanks to this newer technology the current high-z injectors are more linear throughout their pulse range; they are able to repeat shorter pulse widths consistently which means they can provide excellent part throttle and idle characteristics, and operate at higher maximum operating pressures.

I then wondered why would GTR's and GTiR's use resistor packs for low impedance injectors, when all the resistor pack does is reduce the current from the pulse?

The resistor pack is installed to ‘fool’ your ECU into thinking it is driving high impedance injectors. Vehicles that have low impedance injectors AND resistor packs have ECUs that use a saturated signal to operate low impedance injectors.

Most of the OE manufacturers that produced cars with low-Z injectors chose a “workaround” to using the low-Z injectors since it wasn’t cost effective to produce an ECU with the necessary circuitry and injector drivers to produce these P&H signals for the few high performance cars that needed it.

Did anyone even bother following my advice?

yes I did thank you it was informative although it did slightly contradict from what I have read previously about high impedance injectors being able to now run cooler as I had read they do run hotter due to the high voltage requirements. Edited by mr skidz

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • Ok i will get those 310mm. I found one but on a different site. This is the description on those...is it ok? Technical parameters: - Axle: front. - Disc type: ventilated. - Number of holes: 5. - Disc diameter: 310mm. - Total height with center: 54mm. - Thickness (new/min.): 30/28mm. - Designed for brake calipers manufacturer: Sumitomo.
    • You Gregged a whole racetrack!?
    • Look for broken wire or bad connector at the motor. Might not be it, but is worth starting there, as it is easy.
    • Hi everyone, I’m having an issue with my R32 GT-R. Sometimes, when the car goes over a bump or experiences some vibration, the 4WD warning light comes on the dashboard. When I check the code from the control unit in the trunk, it shows Code 19 – ETS Motor. However, everything seems to be working fine — if I turn off the engine and restart the car, the light goes away and everything functions normally. Has anyone experienced this before? Where should I start troubleshooting this issue? Thanks in advance!
    • I'm back from the dyno - again! I went looking for someone who knew LS's and had a roller dyno, to see how it shaped up compared to everything else and confirm the powerband really is peaking where Mr Mamo says it should. TLDR: The dyno result I got this time definitely had the shape of how it feels on the road and finally 'makes sense'. Also we had a bit more time to play with timing on the dyno, it turns out the common practice in LS is to lower the timing around peak torque and restore it to max after. So given a car was on the dyno and mostly dialled in already, it was time for tweaking. Luis at APS is definitely knowledgable when it came to this and had overlays ready to go and was happy to share. If you map out your cylinder airmass you start seeing graphs that look a LOT like the engine's torque curve. The good thing also is if you map out your timing curve when you're avoiding knock... this curve very much looks like the inverse of the airmass curve. The result? Well it's another 10.7kw/14hp kw from where I drove it in at. Pretty much everywhere, too. As to how much this car actually makes in Hub Dyno numbers, American Dyno numbers, or Mainline dyno numbers, I say I don't know and it's gone up ~25kw since I started tinkering lol. It IS interesting how the shorter ratio gears I have aren't scaled right on this dyno - 6840RPM is 199KMH, not 175KMH. I have also seen other printouts here with cars with less mods at much higher "kmh" for their RPM due Commodores having 3.45's or longer (!) rear diff ratios maxing out 4th gear which is the 1:1 gear on the T56. Does this matter? No, not really. The real answer is go to the strip and see what it traps, but: I guess I should have gone last Sunday...
×
×
  • Create New...