TRD/ Magnuson 4.0 Supercharger Tips, Tricks, and Mods

I can't remember, but it seems like it was leaner. I just remember thinking that acceleration was better w/o the jet and boost referenced.

 

You started this whole jet-removal/boost-referenced thing. I seem to remember a weekend where many of us got on board with that plan.

Aren't you running the Ucon?

 

I am not running the UCON. TRD tune for now, with an OVTune self tuner version on the side, but have not utilized it yet.

Jetless/ boost referenced or not is one of the many options you have at your disposal when doing mods to the blower. Not everyone knew that, so in making this thread I felt obligated to share those tidbits of information with you guys.

 

Are you still boost-referenced and jet-less? What pulley are you running?

 

Still boost referenced. Running the jet for now, but it's been modded. It's a meh thing at best. I'm probably going to pull it back out, but I want to dial in my air fuel better. 2.5 pulley.

 

Holy crap. You went all the way to the 2.5" on the TRD tune. You're my hero. What are your AFR's?

 

10.5-10.8 at WOT and incredibly rich at part throttles.

 

Yes. Like I'm ashamed of my AFR's... What kind of boost do you get with the 2.5"?

 

Stock Configuration
With the fpr line connected to the intake the fpr is set to 43.5psi and the fuel system will stay at that pressure regardless of boost. @loginfailed has a fuel pressure gauge tapped off the fuel manifold and has verified fuel pressure doesn't change regardless of vacuum or boost.
Yes, boost is applying pressure against the fuel injectors but the fuel pressure remains constant due to the fuel pump and fpr.
Example: Nominal fuel pressure 43.5psi + 10psi boost = 43.5psi fuel pressure
Boost Referenced
In vacuum, fuel pressure is reduced from nominal 43.5psi proportionate to the amount of vacuum.
In boost, fuel pressure is increased from nominal 43.5psi proportionate to the amount of boost. (I think that is what you are referring to when you say "relieves the extra pressure that the boost is applying on the fuel system").
Example: Nominal fuel pressure 43.5psi + 10psi boost = 53.5psi fuel pressure

@ThomasMore66 The fuel injectors are either open or closed. There is no partial opening of the fuel injector. The ecu tells the injectors how long to stay open depending on engine demand.
When you do the fpr mod you increase fuel pressure under boost which means when an injector opens instead of having 43.5psi of fuel pressure pushing the fuel out of the injector you have 53.5psi of fuel pressure pushing the fuel out if you have 10psi of boost.
The extra fuel pressure is pushing more fuel out of the injector which richens the mixture (in open loop).

 

It was leaner. See my last post why exactly it was leaner.

 

I would think if vacuum was an issue for leaning out the AFR gauge would show that. And I’ve never experienced this being an issue

 

I can’t believe you are still that rich so close to sea level and with the 2.5 pulley. Where is your AFR sensor located?

 

Agreed. It's a great thread! It's one of only a few I ever look at.

 

Are you boost-referenced?

 

In vacuum you are in closed loop so the ecu compensates for the lower fuel pressure by increasing injector pulse width.

 

Do I have an aftermarket fuel pressure regulator? No. But, I’ve been running the FPR mod for at least 5 years. That mod works great.

 

If Mat can put out a working product, I will have input for those wanting to know about TRD supercharged trucks w/ flash tuning (OVT) I will be looking for someone in North/Central/East Texas with a blower installed to tune. It'll be done on a dyno and I'll cover the dyno cost and the tune will be free.

As of right now I'm one of the beta testers for this product, and despite receiving my "software" a week ago, I'm literally no closer to tuning than I was prior to receiving the software. He's busy, sure.. And I can only feel for those who've bought his "tuner" and have yet to receive their tuned calibrations. Despite multiple back-and-forth emails I'm still not able to read the ECU, Edit the calibration, or flash the ECU.

What I can say so far is that you must use different programs from various companies. It looks like PCMFlash will be used (dongle required) to read/write the calibration file and a separate software suite to edit the ROM. He's mentioned a log viewer but I suspect you'll have to use Techstream to generate datalogs. While I'm quite pleased with Techstream's access to engine/platform specific PID's and sampling rate, it's graphical interface and function is CLUNKY. If OVT's editing software suite is able to read the Techstream generated datalogs, I'll be very happy.

 

I have a fuel pressure gauge and have the fpr mod. At idle my fuel pressure is around 37-38. Cruising around it’s at 40 psi which is factory spec. And at wot it goes up to around 55.

 

I could run a 2.5 pulley easy. I'm going to get a quick change soon. I've had nothing but headaches ATTEMPTING to get the tune in my truck. Mailed it back weeks ago hoping ovtune would refund me as promised. I would know more but my emails are returned slower than homing pigeons. I want to go ucon. In Seattle I run extra rich. With the meth it's more. Half throttle I hit 11s. Wot high 8s.

 

I'll have saved the money for a ucon by the time ovtune could make it happen for me. I got my tune 6 weeks ago.