1st Gen Haltech ECU Discussion

Couple things I might do different if I need to remake them but I think it's secure and 99% leak free! (?) All in at around $65 for the adapter slices + hardware.
Will work on the cable pulley this weekend most likely

 

Does anyone else have A17 aka AVI3 populated and mapped to something? It's populated in my plug from factory (white wire) but its not assigned to anything....

 

It's the MAF signal wire on other boomslangs I've seen

 

Ah ok, interesting.
Got the DBW all wired up and it used up all my AVIs haha so had to pull that one. Now onto relearning idle... I do have a tiny vacuum leak in the adapter stack I think so the throttle position oacillates around 1% to keep me at 650 rpm.



So that high pitched whine is back and worse than ever. I think it might be injectors or FPR? Hopefully something dumb

 

Got the top pedal bracket fitted today (the hard part). Bottom is all that's left. The travel is a few degrees too long/more than factory, but I can program that out (eg: 80%=100%).
It did some weird stuff when I moved the truck parking spots this morning so definitely going to have some kinks to iron out before hitting the road again.

 

You may have to adjust your trans cable starting from when the throttle body is totally closed as well. When there's no power to them they're slightly open on a spring.

 

Yea, it's a veryy tiny amount though. No trans issues (yet), but I have it about 15% preloaded. I could probably run it at 0 and just live with the top end neutered. If it works anything like throttle plates it'll be almost 100% pressure even at 70% pull

 

Sounds like it needs a slipper mechanism after it reaches 100%. Wouldn't wanna lose WOT personally.

 

You got it backwards, the cable still has some slack at WOT. I made the radius a little too small

 

Oh I see, thought you weren't opening the throttle all the way, easy enough to make the radius bigger, just need some tape haha

 

Slowly working my way through this behmoth of a thread, and attempting to try to understand as much as I can.

I am currently having issues with my tune, and wanted to add this in here to see if anyone would be willing to take a look at it to see if there is something obvious that can be adjusted to help. I don't know if i can post the file in here, or DM's/email, but feel free to hit me up!

Ill preface this by saying I am extremely novice when it comes to standalone and tuning software. This tune was done by Gabe at SNP when i first installed my charger this last year. I think he did the best he could, given we were having to basically tune off log information because of my location/no internet. Ive been driving it as is for the past year, and typically like a grandpa as I've been scared to break something.

Truck Specs:
TVS1320 Supercharger making roughly 8 lbs of boost at 0-1000ft
AFR is 14.7 at idle, 11.3 WOT
Running 92 premium (Costco if that matters, thought about switching to Chevron or shell)
65mm pulley
650cc injectors
Haltech 750
220LPH Deatchswerks fuel pump
2 step colder ruthenium plugs (did not change gap, believe they were .036)
Truck is at 265K miles, the coil packs were changed at 230k. I've kept a good maintenance on the truck, and it ran like a top before installing the charger. Still runs ok, but I feel a little underwhelmed in general as it sits. Planning to upgrade my headers, intake and exhaust in the future before finding a dyno and booking a session. I'm still running the cats, unsure if it's wise to ditch them. Emissions are not a problem where I live, so im free to do whatever with exhaust as long as it's not obnoxiously loud.

Main problem: typically 1500-3000rpm, 2nd and third gear creates throttle surging/ herky jerky feeling. cruising at 2000 rpm in 3rd and 4th, very slight surging/herky jerky feeling. It doesn't feel 'smooth' if that makes sense, like as I am driving there is small, slow pulsing feeling of power. I don't know if that is normal. I also notice that I have a lot of detonation when coming from a stop if I try to get on it too hard too fast, same with rolling on the throttle from say a third gear 35-40mph roll, 2nd gear through turns/roundabouts ect. I drive it like a grandpa to avoid it, and the second i hear any sort of rattling i back out and gently roll on the throttle to get up to speed.

2nd problem; I have an intermittent 'stall' on deceleration, followed by dip in rpm and attempts to correct by ECU. It seems random, but i notice it mostly when i'm letting off throttle to downshifting and coming to a stop, but it also can happen while cruising at highway speed (55mph, 3kish rpm). It's like a split second complete cut of power, I guess the only thing i could compare it too is if you just dumped the clutch with no gas, and after that split second the RPM fluctuates as its correcting itself. After it cuts out, it will typically stabilize within a second.

Third problem; intermittent issue with startup where idle is searching up and down, getting larger and larger until it dies. after re-start or with a steady input of throttle it corrects itself and begins warming up like normal. Truck is very sluggish and has bad idle searching/surging past 10% throttle while warming up (>160 degrees F). I'm not sure if this is normal that the truck is very un-happy if you try driving during warmup, but I am pretty good about letting it warm up for 5-10 minutes while the temp gets above at least 140. I had cleaned my IACV when i installed the charger, but i don't think that it is the issue, as this is ONLY during a startup, once the truck is warmed up i maintain a healthy idle at around 900-1000. If i let the truck sit after driving and start up after maybe a half hour or so, it will sometimes do this, but im usually in the truck and can give it a little gas to help it not die.

I'm sorry if this is a long, bloated post. If anyone has any suggestions on where to start, I'm down to listen and experiment.

 

Working through it as we speak!

 

Thoughts on using a Nexus S3 instead of the Elite 2500? Looking at the spec sheets the S3 seems to be the upgraded successor. Boomslang makes a harness for the S3 for our trucks so I wouldn't even need to make a custom harness.

I was going to try doing a custom Speeduino ECU, but I don't have enough time for that unfortunately.

 

No reason to go with the 2500 with the S3 readily available, and comparable pricing.

 

The s3 is an absolutely killer setup, and it simplifies the install a good bit with it having an internal wideband controller. Tons of great control and options!

 

Are you using transient throttle or MAP prediction? I had similar behavior on mine with transient, and it solved a lot of the quirks when I set it up on MAP prediction after selecting SC in the engine configuration.

Sounds like your tune is in a rough state. How much time did you guys spend trying to dial it in after install?
Are you getting trigger and home signal sync?

 

1. Lower your spark gap.
2. Not sure. Check your decel settings to make sure it's not triggering fuel cut when you don't want it to.
3. Try disabling timing correction and just let the IAC do the work - see if it helps. Your PID parameters sound like they need massaging though.

 

It's not that, .036 is fine for his boost level anyhow, only really needed one step cooler plugs too but that's not really critical for getting him fixed up. I saw the "tune" he's been running on, it's rough man. But we'll get him fixed up

 

At 8psi, I definitely had his symptoms of jerkiness at my factory gap. I would still lower it just to rule it out....

Nvm I forgot factory was 0.044

 

Transient works just fine, and actually does a great job of taking out lean spikes on tip in where map prediction can't always help. But the key is having the correct amount and correct decay settings. I have both enabled on my truck and tip in is pretty solid. His tune was set up to sync but at another very random rpm.