1st Gen Haltech ECU Discussion

OK that's definitely valid.

 

It totally is. The blowers on these trucks aren't intercooled so it makes a big difference. I do have PTFE gaskets on all intake connections.

If I were to give you a ride with water meth turned off and then turned on, you would notice a difference. It pulls harder and produces more boost due to the cooling of the boost charge air. More oxygen rich which fuels a stronger combustion.

 

With the haltech it's really good to have it controlling it just because then it knows that it's firing as well and we don't have to worry about the haltech trimming out fuel in part of the map on its own as part of learning because of the methanol. During methanol firing it would know what's going on and can appropriately cut back fuel on its own in accordance with the amount of methanol being injected. And if you are smart and have a low level sensor in your reservoir the haltech knows when it's out of methanol and just runs normally and not pull out fuel.

 

Just to clarify, I spent like a whole week nerding out over methanol injection so I get it I plan on doing it eventually, too. But yes! Those thermal intake gaskets really do work. Re: the HT control over the methanol injection, that's really great to hear about.

 

The first pull of the day on my buddy's super charged truck is always a freight train in comparison to a heat soaked one. Whereas with my intercooled turbo setup, every pull more or less is the same given the density altitude didn't change drastically between them. The meth injection systems would almost be just as good nn this application with a Haltech just spraying a bit of water for the whole latent heat of vaporization effect since you don't really need the fuel, although methanol does also raise octane. The only thing I dislike about meth systems is it is another tank to have to keep full and you have to regularly check your nozzles to make sure they aren't clogging with crystalized nuggets.

 

Cool. trust me, I've thought about a way I could possible intercool my shit but that's above my pay grade. I wish I didn't have to use water meth, but I'll take what I can get for now.

 

I was actually just able to get the pump to function as it should without the second relay.
Pin 30 needed a an ECU switched 12v source, not constant hot. There was an unused one on the harness that did the trick.
I could have sworn I had it like that previously when initially trying to get it to work, but it's likely I had something wrong.

Nonetheless, I'd still like to get the progressive part working if you think that's doable.

 

Can you send me your current tune that includes it?

 

Okay, well I'm sorry I guess it's a technical limitation of the 750, it doesn't include progressive control, I made a new map for a 2000 and it had the option present in the map. I think we could probably hand jam it using generic outputs though so I'll look into that. Also you should consider updating to current firmware, fixes a lot of little buggy things, you'll like how it drives after.

 

@betterbuckleup Weird shit, they just turn this feature off as a paywall I guess because I can make a progressive map in a generic output for full 3D duty cycle control of your pump. It's up to you if you want to or not.

 

I was hesitant to update due to the changes with the transient throttle and then having to go back in a completely re-tune it.

iirc, there was previous talk about using the generics to achieve this like you're saying. I don't know how to go about doing that though and am willing to give it a shot if it achieves the same result. Sounds like it's a roundabout way of doing the same thing but without having a dedicated menu for it?

 

I'm happy to walk you through the update, there's no retune required and after the update you can always go back to your old transient settings if you want... but you won't want to haha. All the changes from transient to MAP Prediction have made the difference on mine between a good tune and a tune that feels like it has factory polish.

That said I am happy you got your relay wired such that it isn't going active with the ECU off and if you wanted to do the meth tuning I could most likely walk you through that too, I'm not sure how much efficiency there is to be gained with progressive over just picking the ideal nozzle and running it full on for your given boost amount since the range to be progressive is so narrow on your setup anyway... (3-7psi is a small window to ramp up or down duty cycle especially with an SC)

 

Maybe I'll do the update when I get back this weekend from the mountains and give it a shot. The transient is mostly there as is, but there have still been a few oddities here and there I haven't been able to tune out and have just come to live with. I'll give you a shout if I need a hand. I'll probably start with the HT article on how to tune the MAP prediction.

That is a fair point about the gains...it likely wouldn't be that much of a difference in performance than it is now. The appealing aspect of it to me was the potential savings in water meth at lower boost levels. When I want to keep speed up certain grades, I'll find myself sustained in the boost range right around where the water meth kicks on. Peak boost I've seen is 11psi, but up at elevation it would in fact be a smaller scale with a lower ceiling.

 

One other option to consider would be a fuel pressure regulator on the methanol pressure output that's boost referenced, could have your meth scale the old fashioned way that way.

 

Hmm that's an interesting idea. The pump is rated to 300psi though so I think that would be a very expensive pressure regulator to go that high.
I do like your idea of tying in the tank low level sensor into the HT for protection. Right now I don't have it doing anything, so would be a good safeguard. I might tackle that before any progressive functionality

 

Changed from classic transient throttle to the MAP prediction, and it is as good as everyone says.
I haven't changed any of the default settings for it other than telling the ECU I have a SC and it works great right out the box.
I no longer have a dip in RPM off idle like I used to. Outside of that, I don't notice any hiccups or oddities.
Gonna drive it for a while and let the long term trim do it's thing.

 

Glad to hear it! It's been the best update I've seen so far and I spent hours previously tweaking transient.

 

For anyone interested in Haltech units, select ones are discounted for black Friday on their website.

 

Snp also running BF sales. Where I got mine last year