TRD/ Magnuson 4.0 Supercharger Tips, Tricks, and Mods

yes, very familiar. It’s not just ucon related, it’s been discussed here several times. I have data logged and worked with Scott several times on it. You can see the ecu pull spark, but it’s not simply from a normal engine parameter.

Not just a normal issue, it’s ecu related. Not just Ucon either.

 

That is VERY possible as well! I didn't know he was using UCON, but if he is, that would explain a lot as well.

 

Sonofa.. ok so isn’t it like $150-$500 for a ‘new’ ECU.. has anyone experiencing this tried swapping/flashing theirs with any luck?

and FTR, I never intended to portray this as a UCON issue. So far have been happy working with Scott/G and their products. I just want to figure this damn thing out!

 

What do AFRs look like while this is happening? I had an issue with my UCON where one bank would go lean and the guardian would kick in to protect the engine. It was an intermittent problem while going WOT. Took lots of troubleshooting to narrow down the problem

 

Planning on taking UCON run data today if possible to capture.

 

I have screen shots of mine posted in this thread.....somewhere.

 

DocME’s previous post
(https://www.tacomaworld.com/threads...ricks-and-mods.518932/page-1375#post-23358141) with screenshot:
“””
Sounds so much like what I experience with the UCON. I actually got a good data log of it at the time. Here’s some feedback on it. Don’t know if it’s relative to your issues.


First off, the steady state and wot are nominal (plot 1) below:

AFR control excellent

Adaptives are tight

Spark is excellent at 20’

No signs of knock


Regarding the unexpected decel:

I do see the throttle pulling back from 21 to 8.79 when the pedal is firm increasing (plot 2).

Mass airflow is spiking high then low (toggle) around the event (plot 3, point 2536)

The CAMs are both falling from 16 to 6’ around the same point.

AFR control is nominal – no lean spikes.

Engine acceleration does not decrease until 300ms later.

Spark angle is being driven by torque control mode…


So the MAF toggle presents like a physical issue.

It occurs before the throttle drop.

And you mention that this only happens more when turning.

I would examine your air induction pipes.

Make sure there are no vacuum leaks and all pipes are moving when the vehicle flexes during turning…

It could also be related to bad wheel speed sensor going into the traction control computer (UCon does not access).

Try keeping traction control off and see if the unexpected decel disappears…

“””
Issue is I don’t see anything but pretty lines with that one.. the data numbers below don’t show the time of the drop, just before it.

Will try capturing and posting a set I can produce today and finally stop flooding this board (for now hehe)

 

I gotta ask. Are you doing this on a smooth road with no wheel spin or steering input?

 

There will almost always be steering input with road crowns/small road changes.. but for the most part yes to your ask.

no wheel spin.

and what’s interesting to me, is that this happens regardless of VSC, I have a ‘dumb’ taco, no VSC/Traction control modules/functionality that I’m aware of as those came after 2008. Likely NOT the case for FJ/4-runners (assumption)

 

It is like that with 4runner/Fj which I why I unplug the abs when I go to the road courses in the 4runner. I would suggest the same thing for you just to eliminate that possiblity however on my 09 Tacoma just holding the vsc for 5 sec makes it drive similar to my 4runner unplugged.

 

hey s/c nerds. Looks like a tundra s/c member is making a smaller pulley than is available on market for the tundra magnusun. Any input on the below that I could pass on?

https://www.tundras.com/threads/general-supercharger-thread.85513/page-110#post-2912097

"I made the pulley hub for my modular Magnuson pulley. With how tiny this thing is I don't trust it out of aluminum, though I also haven't done any analysis so good chance the stock style pulleys are just very overbuilt. But considering the size and my intention of using helicoils, it makes more sense to just have the hub be out of steel. I might end up making the pulley out of steel too, especially on the 2.000" pulley where material is a premium. And since the pulleys are smaller they'll have a drastically lower moment of inertia so will accelerate faster regardless of what material they are, though I doubt it'd be remotely noticeable anyways. I need some larger bar stock to make the pulley, with the intention to confirm the belt properly engages. After that I think I'll feel confident to order some samples."

 

I think that is a sound design he is working on and he should have zero issues with it moving forward. I have no input to give on it and I dig how he "keyed" it so there is zero chance of the pulley itself shearing the bolts off.

 

Ok..

Collected data, got ‘lucky’ when I went from mellow to full throttle (or nearly full floor mat limiter ) the truck jerked hard three times before some meh acceleration. Rest of the dataset was just normal driving.

looks like lean spike on tip in that it has a hard time recovering from, just no clue why. Unless someone wants to test my vacuum system knowledge, I have a hole in my air surge plenum, or that stupid mystery valve on the back of the plenum has been screwing me this whole time, I should be EXCELLENT in terms of gaskets/hoses (including exhaust to head and coupling and sensor junction points) (also including all EVAP hoses/containers).

my fuel injectors all seem very clean, I have fresh o-rings between the injectors and the rail, along with rail to intake manifold that were all greased with a bit of gear oil for installation lube. All contact points were cleaned.

my tubing is mated in the straightest designed path possible to not cause turbulence before the MAF sensor (URD MKIII)..

the spark seems to be reacting to the AFR, and this is where I leave it to the pros in here with access to UTune to check my data log out. Attaching a couple pics to show the air surge plenum mystery valve and the gnargnar oscillation in AFR and RPMS this dataset collected.

Open world link via google drive of u-time data collect this snapshot was from:
https://drive.google.com/drive/folders/1hg4xBFDYOqCdPWZIl81QQ7FYh2zF851F

I’d like to think that spark angle reduction is a reaction to the lean spike.. it also seems like this lean spike is seen on both banks (ruling out an exhaust leak — unless someone totally screwed me over by jabbing holes in both headers…. Lol

Hoping someone with magical powers can get eyes on. Also sent to Scott and will share what he says here in hopes to help someone else at some point. THANKS!

 

Take a good picture of the "hole" in your air surge plenum. Or a few with different angles.

 

Haha, my bad - I was tired. That’s hypothetical, I don’t actually see a hole, it holds -22 InHG at idle consistently.

 

I got a new ECU from FlagshipOne for like $280 or something. Then had it flashed for the S/C. It works perfectly.

 

Looks like the guardian kicked in to protect the engine since it was lean (this is the womp womp womp power cut you're getting). Did the 61lb injectors come with your URD kit? When i tried running those on my UCON with the TRD blower, it did gave me lots of issues after retuning for them. Swapped back to 455s and it was smooth sailing after that. I personally think this is UCON related if everything on the truck is in good working order. Are there any other issues at idle or codes being thrown or is it mainly under half to WOT conditions?

If it was me, i'd probably buy a spare ecu and have @JustDSM build you a tune for your URD blower. This would allow you to isolate the problem and determine if it's the UCON causing you issues. This is how i determined the circuit boards on my UCON were bad.

 

Yes, 61lb injectors.

god I wish I didn’t throw my stock injectors away (I’d run the test Torpsd mentioned months ago)... but I like that solution as a great testing place.

did you wind up getting a replacement ucon or stick with the tuned ECM?

 

Hey @JustDSM, how would one go about getting a tune from you for this? I think I’ve exhausted all other ideas

 

URD ended up replacing my UCON free of charge, but a few months after that I swapped to a tuned ECU using HPTuners