1st Gen Haltech ECU Discussion

Your tune is so conservative I'm not afraid to whack the throttle wide open haha. But there's some efficiency on the table when we shift the safety net from a fat tune to multiple fallback safeties with all sensors present. It's all an iterative process, but this is why I start safe and work to power/efficiency.

 

Hi everyone, my PRD2L converter is now available! I currently have enough components to make 3 to order. I will also include 2 AMPSEAL (Haltech) pins with these orders (you should only need one, the rest need to be tapped to stock wiring or PnP harnesses).
If you have any questions about it, feel free to ask here or DM; I plan to do a larger write up about it soon. I also have a draft info guide with some examples attached. For instance, I will be using mine to feed me P/N, Gear 1, Gear 2/3, Gear 4, and Reverse. This will enable per-gear axis tuning if I so desire.

Note this can also be used as a universal switched input to a single (5 volt) analog output. The only stipulation is that naturally you can't read if two inputs are on at the same time.

https://tcarpenterprises.square.site/product/PRNDL-Signal-Converter/2?cs=true&cst=popular

Use code TW10 for $10 off.




@Speedytech7 I'll have yours made this weekend most likely

 

Wish I could do this with my manual tranny. Would be nice to take some timing out of certain areas in 5th gear for added safety

 

You actually can do that. You just have to turn on gear detection by ratio. Once you have gear detection on you can add it as another axis to your timing table or make a correction table for it

 

by ratio? how does that work? afaik there aren't any gear position sensors in the w59 transmission other than reverse.

 

Once it knows the ratios of the trans and you have your VSS calibrated it can determine your gear by computing engine RPM against road speed. You'd need some sort of override for low range though, or some sort of 4 low sensor so it knew to adjust ratios or you'll find it taking timing out in low (not that you'd notice with all the extra torque anyway)

 

How does it know the road speed? Is it the relationship between the speedometer and the tach?

 

Oh I see. I would only be doing correction in 5th gear which I'll never be in with low range so shouldn't be an issue.

 

The vehicle speed sensor is wired in it just needs to be calibrated. Which is super easy to do with a GPS readout on your phone. There's a write-up online on how to dial in your vehicle speed sensor in the haltech software

 

I also go over that part briefly here under "Vehicle Speed Calibration"

 

I'd do what Speedy said - makes it much easier. I'm not sure how much slip it needs to account for so there's not quite as much end user control but I'm sure it works well to approximate the gear.
Kind of surprising there's no form of electric gear detection on the M/T but I couldn't find much on them in my FSM.

 

Yeah theres no gear position sensor of any kind on the manual box. Just reverse switch for the lights. Because its a manual there shouldn't be any slip to worry about (unless his clutch is blown haha) so it should have no problem inferring gears

 

Should be real quick and easy to get setup too. I love that I'm finding more and more features on the HT that I can use to my advantage like this.

Got me thinking, what's the downside to using this method for gear detection in the auto? Just not as accurate? Only difference would be the torque converter and one less gear, right?

 

Was just thinking by slip more the period between gears where you may rev higher than that gear is calculated for due to no load because clutch is disengaged - so what does it do if you overrev for the speed you're going? Assume you're in a lower gear suddenly? Then in a higher gear right after?

 

I haven't tried it to see how good or bad it is with the A/T tbh, but ya the torque converter will get in the way of accuracy

 

Yeah it isn't a hard calculation to do for the ECU, it's always doing it on the fly in the background, there's only one gear possible per combination of RPM and vehicle speed, and over revving would have no problem since it's a free-rev scenario, as far as timing is concerned he'd never notice. But you can put a few ms of delay in too I think if the thought of that happening bugged you. Can probably use a clutch switch so it ignored the gear position during shifts if you really were anal about it.

 

If those are options in there then ya I think it's fully configurable after all

 

Btw thread members, I have been able to read HT CAN messages on an arduino over the weekend



This will ultimately enable me to make my own gauge like the HT-061010, but, you know...for a rational price. I'll open source it after I'm done and I might go as far as buying a 3D printer to put it all inside a standard size gauge pod. Would probably sell the kits relatively cheap. Since it's the Haltech CAN, not the Vehicle CAN, it should work with all HT models (since the 750, etc, only have one CAN port)

Note the 0x360 Base16 encoding, "03 E6", which = 998. This is the truck just sitting there (no idle) and these should be the bytes for MAP. 998/10 = 99.8kPA, which is nearly 1atm, which is exactly what we should expect!

 

Sweet! I'd love a medium size display that isn't in a gauge form factor, have some real estate it would go well in.

 

Ok cool, I'll keep it in mind that some may want a larger display