1st Gen Haltech ECU Discussion

New feature released. It appears to do some kind of correction to fuel based on 1. how long you estimate it stays on intake value before evaporating, 2. what % pools on in the first place.

Edit: Technically speaking, normally it wouldn't be a problem in a steady-state environment because the next cycle of fuel just replaces the previous pool. But in the transient state, we're injecting so much more fuel that it can be viewed as an independent event. Therefore, I think it's effectively going to be an overcompensation number working with the MAP Prediction table. eg: 20% pool ~= 20% more fuel than MAP-P table says since 20% will stay behind. Though I'm still not sure what effect evaporation rate has since that fuel should still be in the intake floating around somewhere. Perhaps it does look at the time since previous cycle (RPM) and calculates what % of fuel is still sitting there when a transient event is activated.... I would still think the charge air would bring nearly the full evaporated volume back in though.

 

Fuel injectors rarely spray directly into an open valve for their whole duration. The film is the fuel that wets the walls of the port and runner and back of the valve. It's fairly important to estimate properly for reaction and to avoid jerkiness on and off the throttle due to starvation or richness.

 

That is super interesting!

Thanks, gents!

 

@jubei here is a good video from Haltech helping to explain things.

https://youtu.be/DMT9kVO7fUU?si=z8lG3F0BJEmb1uuC

Another good one from HP Academy.

https://youtu.be/dSDUP7hhsmI?si=4mW75UUQi6slzMU2

 

Maybe we could make a deal and get you into the Nexus and me learning on the 750. I remember talking a little about this a while ago but I kept telling myself that when I do a Haltech I'd want to spring for complete standalone capabilities and buy once cry once even if I don't set the throttle and transmission up right away.

Maybe I should do the 750, learn a few things then sell it to the next guy when it's time to upgrade like your doing

 

Just get the 2500 then put a grand in the SN(&)P500.

 

2500 is likely a month or two from getting discontinued with the rest of the Elite line

 

Wow, why?

 

For the Nexus S line that's soon to be unveiled. The Elites are over a decade old and Haltech just purchased a new manufacturing facility to ramp up production... writings on the wall

 

Ack, I'm obsolete already

Wifi programming would be nice though...

 

Went on an abruptly shortened wheeling trip but everything performed perfectly, hell even cold starts in Montana were easy, 1-2 seconds and it came right to life.

@treyus30 Was thinking about your boost response, had a lot of hours driving this weekend, have you had Spool Assist turned on the whole time? On mine if I don't have it setup properly it will bring it in on the attack like crazy and overshoot pretty much if it isn't configured right.

 

Ya I have spool assist set to follow 4psi behind the target (15). No overshoot, but it probably could help get the right DCs if I lengthened that gap a bit for the time being

 

When you're setting up your DCs initially that feature must be off, and with how violent your spool is described, I'd just have it off in general. Shouldn't be coming in so hard with the throttle barely open.

 

My truck has been loving the cooler mountain air

 

Ditto!!! mid 60s to 70s intake temperature lately and loving it. Fried my first Innovate AFR Bosch sensor this past week... only 5 months in so a little concerning/disappointing but apparently not uncommon per reviews. Got that replaced, and some vBands tightened back up yesterday and she is running quite lovely.

 

I got some replacement Vbands for the crossover yesterday and I've still got a small exhaust leak somewhere as well (P0420 came back).
surprisingly I haven't fried the bosch 02 sensor yet but I suppose there's still time since you were faster at getting it installed. I thought it was going to be dead after it lost power an hour or so away from home

 

Think your still leaking out of that manifold/crossover connection? You only sanded down the manifold vband right? Not the crossover portion?

 

Correct, that's a high possibility spot. If I had an extra set of hands to hold a rag on the tail tipe it would make pin pointing the leak(s) easier.

 

Hose clamp or similar device?

 

I thought about that or even just jamming a balled up rag in there. It doesn't have to be perfect just something to create a little pressure and not melt