TRD/ Magnuson 4.0 Supercharger Tips, Tricks, and Mods

And you're on the stock TRD tune correct?

 

I’m not even SC’ed. Mine is still sitting in the box.
I developed my off idle hiccup right around the time I cleaned my MAF on my last tuneup. That’s what makes me think it’s the MAF.

 

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…

 

It sure seems like it man. It really does. I can literally see the blip on the throttle graph.

Anything is on the table right now, but the thing is that this issue seems to have developed recently. If it was related to the FPR it would had reared its head a long time ago when we first started doing all of this.

Ahh.. okay, nevermind then. Haha. There goes that thought.

Oh man. So you must be just as annoyed as I get when you drive yours.

 

I've seen this on N/A and S/C calibrations at his point. Stock tunes and modified tunes.

In every case that it's happened in which I have datalogs to show what's happening during the event, I can clearly see the ECU is believing it's still at idle and is cutting timing. I initially suspected it to be a wheel speed sensor issue in the first case I was made aware of. I'm interested in @o0opackersfano0o suggestion to see if the brake light trips on accel, indicating brake input. That could potentially explain this if not the wheel speed sensor.

I see, from the data I've collected it's not related to throttle, MAF anomalies or FPR mods.

@DocME, Any chance you can trim that log down to just a second or two before and a second or two after the hesitation event? That's a pretty "busy" screenshot to make sense of what's happening for just a split second event.

 

This may be silly, but I am curious when this happens do you guys have traction control on? Is it possible the tires start to spin a little fast and the ecu cuts the engine for a second?

 

From the exaples I have seen, it's all "normal" light throttle input during initial take off. Typical day to day driving. Just as the vehicle starts moving the ignition timing drops out (from the idle control taking command of timing and applying the idle correction map) for a split second, causing a bog, and then the vehicle returns to the Base timing map and continues on as normal.

Not a traction control issue, though good suggestion. If that was the case you'd see the accelerator pedal remain constant, commanded throttle constant, but a dip in throttle driver demand. In the cases I've looked at that was never a problem.

 

I have had issues with throttle cut on initial acceleration, with my UCon, and it ended up being the cams were being advanced at wot and it was cutting throttle to the engine. In my case it was caused by traction control being turned on. After i turned it off the issue went away and it spun the tires willingly. This always happened right when i would punch it from a stop

 

Good datapoint, but completely different scenario from a casual/gentle take off and a "hammer it off the line" take off. In your case however, It is to be expected to be a traction control thing and thus be dealing with throttle closure.

 

Ahhh i missed that. Didnt realize it was happening at partial throttle.. that is definitely strange, looking forward to seeing what ends up being the root cause of that, especially if you've seen it in n/a trucks as well!

 

How about yaw and pitch with VSC? I always get my pee pee slapped accelerating on a good on-ramp with no sway bar

maybe recal?

 

I'm having the same problem although less lately. Truck momentarily feels like a hiccup/stall every once in a while. Curious to see a resolution to it

 

Ah, so it appears I'm not the only one who is experiencing and has experienced this unusual issue.

 

This is one of my targets as well. I'm convinced my problem is related to VSC. For me, my pedal command does not change, but the throttle closes and reopens. This happens under light to firm throttle command.

@BassAckwards what you describe happens to me exactly, but it now happens under various throttle input levels. Sounds like this could be something effecting stock, UCON, and HP tuned vehicles.

 

Have to see if/when @12TRDTacoma could make the trip.

 

Your getting hot air with filter directly above header/exh manifold.
Where did you relocate battery to?
Is there room for the filter at stock battery location?
You may want to look at turbo setups as most have intercooler outlet near the battery then across the radiator to a 180° turn to the tb.

 

You know Roost is onto something @snowsk8air2 .. the only solution I see for you is cutting a hole in your hood and have that filter right there. Don’t get much colder than that

 

Battery is behind the back seat. No turbo funds and like the reliability of the TRD blower

Edit: thanks for the inputs fellas. I’ll re-look into relocating the intake if I can, adding louvers as a secondary step, then meth injection if I still can’t get it cool enough.

 

*cough* snorkel solves all your problems *cough*

 

@12TRDTacoma roadtrip?