1st Gen Haltech ECU Discussion

I looked at the Five O site. Thanks for that. I have left a message for some assistance.

Any recommendations for some 750cc injectors that will work with my current injector plugs on the harness?

 

If you're specifically looking for 750-1000cc then I'd likely get these
1000cc EV14 Fuel Injectors Import Fit for Toyota, Mazda, etc.
and a set of these
Fuel Injector Electrical Connectors Sumitomo female/USCAR male adapters
That leaves you with the opportunity to run Bosch injectors with EV6 connectors down the line if you wanted still, just unplug the little adapters.

I can show you what we are using currently when I get home, we have a few other different options around the shop that just require top hat adapters too.

 

I'd spring for a set of Injector Dynamics injectors. My buddy just received a set of 6 injectors from Armageddon Turbo and Performance for roughly the same price as a set from SNP. They have the best prices I have seen, and they have 6% off coupon (coupon code: newyears) on top of that.

 

ID is also a good option, they have great data thats ready to import into a Haltech as well. Which reminds me, any chance you want to make a deal on the 6 1050s for the 1FZ... that's my next project haha

 

Yes, having the injector data certainly helps. I just sold the set of 1050s last week.

 

Yeah it's a mystery to me why SNP doesn't provide datasheets with their injectors.

Also dang on the injectors, that was a solid deal you had on em though. Only just spotted them on mud this morning.

 

Appreciate the info. Looks like I'm going to go with a set from Five O. Bruce also confirmed that I have the EV6/EV14 connections after I sent him the pics.

I like their service already. Just deciding between 750cc and 850cc. I may go a bit larger in size just in case...

 

I switched my fuel pressure reference from turbo port to manifold for constant pressure differential over the injector. It's wild how much more stable the midrange sub-boost VE table is. Problem with the old way is you get fluctuating positive pressure (eg: 0-5psi) for a given load cell depending on conditions

 

Wait you had it how before?! It should always be manifold reference, like the Haltech map sensor.

 

I have my FPR referencing after the intercooler. Thought the FPR wasn’t supposed to see vacuum, similar to how wastegate reference shouldn’t see vacuum? I know with wastegates vacuum damages the diaphragm, assumed it was similar for FPRs.

 

No your fuel pressure regulator should see vacuum and boost unless specifically stated in your software that it only sees boost. It won't hurt the diaphragm.

 

Interesting. I mean it does make sense to have it reference manifold pressure so, like @treyus30 stated, you keep a constant pressure differential across the injectors. Factory ECU doesn't seem to work this way, because in stock configuration the FPR references atmosphere in the intake tract, it has no clue what's happening in the manifold. I essentially had Gadget's "Free 1:1: FMU" mod that the supercharger guys run so that fuel pressure increased proportionally only in boost. Did this before I installed the standalone, and then just carried it over after the install. I guess the over-fueling in vacuum just got tuned out in my VE table.

 

Ya idk why I thought that was the way it was supposed to be. I think because the OEM connection was the airbox, or it was remnant from before I had larger injectors to try and get extra fuel

Ya this ^


The VE table is looking much more linear and consistent as LTFTs add fuel back in

 

So when your FPR was referencing the turbo port, it was causing your fuel trims to move around quite a bit, am I understanding correctly? Just asking because I haven't seen that problem, but maybe because I have the FPR reference after the intercooler and maybe airflow is less turbulent there?

 

The stock ECU doesn't have any knowledge of manifold pressure, it is purely calculating flow with the MAF so it is easier for them to have the MAF load duty map designed on a nearly static fuel pressure that just takes some light reference from atmosphere and the pressure waves of the intake tract before the TB. That's why your FPR line was originally going to one of the intake silencer boxes. The early ECUs in the 95-97 models actually did manifold reference the FPR and used a VSV to go between atmosphere and manifold for assisting in hot starts but I think they decided that was more work than it was worth because in nearly all Toyotas it was dropped for the 98 model year. But almost all aftermarket ECUs expect a manifold referenced FPR and if they don't then they have menu options for it like Haltech does. The default in Haltech and MegaSquirt (no idea in rusEFI or Speeduino) is for the FPR to be a 1:1 unit with manifold reference.

 

I did some research and rus is the same way. However I don't think it really matters all that much. It all washes out in the VE table.

 

Ya. And I would always notice weirdly high differences in cells adjacent to each other. I can see how post-intercooler may not be as bad

 

It helps with the unstable behavior larger injectors exhibit at low pulse widths though. You can fudge VE numbers around to achieve anything you want in the short term but having it be stable and repeatable, especially if you don't have the low pulsewidth adder table figures (don't think rusEFI would even have an advanced feature like that), then you'll appreciate the help of a manifold referenced FPR.

 

Probably still need to hand smooth your table, auto tune won't do all your work for you.

 

Ya eventually when I'm satisfied that LTFTs are just oscillating up and down (signifying everything is ballpark) I will. Doing this has basically reset the learning process on it unfortunately. And it's still not fully learned on high boost, just because it's difficult to drive for very long in those regions