UCON Flex Advanced Engine Management System

Does the same lean condition happen without the Ucon? If you have a new ECM what flash are you running?

 

My thought. Remove ucon to rule it out

 

Man I hope not.. what problems were you having?

 

the old ECM had the BD tune flashed and I’m not sure if it would lean spike because I had no way of logging and didn’t have an AFR gauge at that time. I installed the AFR gauge with the second engine and Ucon install.

 

I had JustDSM flash the old ECM with the TRD flash and I didn’t notice a lean spike, but it seemed to be delayed all together on tip-in

 

Mine was intermittently going lean on one bank only under mid-high loads. It would always happen at the worst time, like when trying to pass someone and the guardian would kick in.

 

yeah it’s a little embarrassing when guardian kicks in lol. Especially when trying to pass someone.

 

Replaced all O2 sensors (front and rear), relocated fronts to the collected on my URD Headers, and haven’t had the guardian kick in since, however, I still experience hesitation under hard acceleration (intermittently) and from a stop. Also running a walbro which I installed the shit out of personally because I’m paranoid as all hell.

meeting up with Scott tomorrow for a diagnostic, see what he says, if nothing major, I’m going to replace motor and tranny mounts with solids to see if that’s the source.

 

For clarity, I used proper denso sensors from URD (a very reputable distributor).

Scott said engines running way rich, after warming up a bit it was still rich, asked if I had the right fuel injectors installed (which I replied, yes, straight from URD, did the work myself). Idle speed was also noted as being high, now I just have to give him a couple snapshots from on the road performance logs to help figure out what’s going on. All in all, the support from URD has been pretty impressive!

Torpsd, do the stock engine mounts start flexing more over time, causing for more difficult/delayed starts (motion, not engine start)?

 

Looking for some data from others running the UCON. Can I get some peak MAF values from some when doing some 1, 2, 3s in Mexico? WOT in second I see peak MAF 267.
Scott at URD says you can multiply MAF*1.18=HP at the flywheel. So 267*1.18=315 I assume this is a loose factor but gives ballpark #s.
Magnuson S/C should put me at 305 flywheel stock. I have many modes-
UCON, gears, Tstat
2.825" pulley
URD Headers, y-pipe
3" catback with a single hi flow cat.
AFE intake
Rolling 34" Es, heavy
Regeared to 4.56

That should equal much more than 10HP?!
This was on a cool day in the 50s, only ~400ft above sea level. Just did a compression check before, all cylinders between 179 and 183. Scott reviewed my data and all was nominal.
What am I missing?
I have 2.6" pulley and bigger injectors ready to go in. Would need to migrate over to HPTuners in that case.
But if it's only gonna get me another 10HP why bother?

 

I did some digging from when i was running a 2.6" pulley with my UCon. I was also spraying 375 ml/min of water meth at that time and have URD equal length headers, roosty y-pipe, and 3" catback. My max MAF I saw was 342.6 g/s in 2nd gear and 343.5 g/s in 3rd and my truck is also a 6 speed like yours, but im regeared to 4.10s and running stock sized tires.

 

What's the peak MAF you see in 1st? I would expect to see something similar in 2nd gear.. 267 g/s seems a little low imo

 

Mine:
All is nominal:

AFR control is excellent

UCon adaptives close to zero

Max MAF 354 g/s good

Wot Spark 16’ (94829,165)

No signs of knock…


That was all per Scott.

details:

1. Vehicle has URD 7th injector, 61# per hour injectors, 2.5" pulley, Stock ECU has TRD Tune.
2. Sparkplug type/gap:
   $12 Denso IKH24 Denso 5346 Spark Plug
   Denso IKH24 Gap .033-.034"
3. Exhaust type:URD Equal length headers, currently have stock y pipe, but will have custom equal length catless y pipe in 1 month, Full URD 3" stainless exhaust.
4. CAI: AFE magnum CAI
5. Fuel pump:
   $139 Aeromotive 11542 Fuel Pump (340 Series Stealth In-Tank, Offset Inlet, Inline w/Outlet)
   Aeromotive 11542 stealth 340lph
6. Throttle body (stock or modified): Stock with 7th injector.
7. Tire size (stock or size): 315/75/16's (~35")
8. Axle (stock or ratio): 4.88:1
9. Battery system (stock or modified): Northstar 37F AGM battery, DC Engineering 250AMP alternator, all 1/0 primary cables.
10. Snorkel (no or brand):NONE
11. Harness modifications (cut or soldered): Tapped into reverse light circuit for back up lights. I will be tapping into the A/C Clutch power supply to trigger a timer relay for the electric fans.
12. 
    

 

Also, I was looking for this a while back. Here’s the command list for the UCON.

 

First, I did a sound dreading project that was overly thorough. On my first log I only hit 316 but when I inquired about throttle position, I was at 75% of 100%. I cut out a little MVL and foam and the numbers above came immediately.

I also have some issues with the throttle being pulled back under firm throttle especially with the wheel turned slightly. Scott said the same thing that the motor could be torqued over and interrupting flow across the maf. I now have solid engine and tranny mounts and I still have that issue. Maybe more frequently.

I personally think that the issue is in the yaw sensor when compared to the steering wheel position(torque vectoring g?). I so want to try removing them and see what happens.

 

I was not in WOT through 1st in that run.
Looking at some old data, I see just above 300Y(g/s) in first and second, but only 242 in 3rd. Intake was measuring 30F vs 50F on the log above.
Truck feels strong but seems like it should have more...

 

I'm seeing a Spark Angle Y of 21.1, wonder why it's more aggressive?
I have the 22 heat range plugs in, or #7 NGK iridium's.

Have you enabled the mythical launch mode?

 

Over sized injectors, and a 7th injector for cooling. That usually allows them to give it more. Are you a phase 2 tune or three? You can see when you turn the truck on and it will quickly pulse the CEL to represent the tune.

edit: not yet on the launch mode. That makes me nervous on the stock tranny.

 

I am phase 2. No 7th inj. I do think it would be easier to deal with another injector versus going with meth and maintaining a tank and pumps and ...

Who knows how to interpret Torque or other obdII data? I know some of it is spoofed.

 

That’s where I was at. I was talking to Scott about using one of the spare outputs to control the meth spray, but he brought up a lot of good points and ultimately it would more on us to develop it and tune it. I elected to stay with the 7th and it’s been a really good addition so far. I’ve bought HP Tuners and other injectors and have threatened many times to jump in, but after spending more time with it, I can’t hardly image extracting too much more out of this setup. So I worked out a deal with Nudavinc and haven’t looked back.
I just finished up a ton of suspension mods and I’ve got it up and running again. Really missed it. It’s been great here lately.