2024 Lexus GX 550 OT+ Build

[xonn]

New GX550 OT+ with 1700ish miles on it. So far it's been great and a huge upgrade over the car it replaced.

Not planning to go too crazy with it since I like how it already sits from an exterior standpoint. Mods so far include:

Exterior and Interior:

Xpel PPF Wrap on Front Clip
Full Ceramic
35% Tint of Front Glass
Leather Shield Ceramic for Interior
Fake engine noise coded out (SOOOOOOO much better)

Performance:

JB4 Map 2

Initial Thoughts:

Getting rid of the augmented engine sound was a HUGE upgrade for me as far as interior comfort. For my ears, it drones especially in the Sport+ drive mode. Fortunately, it can be disabled at the dealership without impacting the noise cancelation.

The JB4 running on Map 2 really woke the GX up. Part throttle driving is vastly improved with acceleration feeling even more effortless than stock.

 

[Cajun Heat]

New GX550 OT+ with 1700ish miles on it. So far it's been great and a huge upgrade over the car it replaced.

Not planning to go too crazy with it since I like how it already sits from an exterior standpoint. Mods so far include:

Exterior and Interior:

Xpel PPF Wrap on Front Clip
Full Ceramic
35% Tint of Front Glass
Leather Shield Ceramic for Interior
Fake engine noise coded out (SOOOOOOO much better)

Performance:

JB4 Map 2

Initial Thoughts:

Getting rid of the augmented engine sound was a HUGE upgrade for me as far as interior comfort. For my ears, it drones especially in the Sport+ drive mode. Fortunately, it can be disabled at the dealership without impacting the noise cancelation.

The JB4 running on Map 2 really woke the GX up. Part throttle driving is vastly improved with acceleration feeling even more effortless than stock.
View attachment 3137

Congrats and welcome to the forum.

 

[rkeezy22]

What are the new HP/Torque figures with the JB4? Do you have a report to share from the tune?

 

[ilumo]

Yea. Very interested in the tune. Didn’t even know they made a tune for this engine.

 

[xonn]

What are the new HP/Torque figures with the JB4? Do you have a report to share from the tune?

I haven’t dyno’d it but it does feel noticeably more responsive and quicker. Their claim of +75 hp is likely accurate.

 

[xonn]

Yea. Very interested in the tune. Didn’t even know they made a tune for this engine.

Yep they do. I’ve also been running their system on my Supra in tandem with an ECU tune for the past 4 years without issue.

It really does produce good results as long as you have enough octane. 93 octane is required / highly recommended for Map 2.

 

[rkeezy22]

I haven’t dyno’d it but it does feel noticeably more responsive and quicker. Their claim of +75 hp is likely accurate.

How do you know it's not too much for the engine if you don't know the outputs/how much boost is running at each RPM at least? Can you pull that without a DYNO?

 

[xonn]

How do you know it's not too much for the engine if you don't know the outputs/how much boost is running at each RPM at least? Can you pull that without a DYNO?

Because I've reviewed the logs and also had the folks at Burger Tuning review them. On average it's 4 psi over stock depending on load.

JB4 allows you to log a number of parameters to assess how the engine is running.

 

[Mainelexus]

That would be fun, but also probably kill engine warranty. Gotta pay to play.

 

[ilumo]

Speaking of dynos. Does anyone have a stock dyno sheet for these cars? I wonder if the factory specs are underrated, overrated or inline with real world results. .

 

[xonn]

I imagine there's quite a bit of driveline loss with the GX. If a stock GX breaks 300 whp that'd be seriously impressive. I'd imagine it'll put down 280 - 290 whp assuming ~20% driveline loss. I'm sure someone will dyno one eventually. If there's ever an ECU tune available, you'll start seeing them on the dyno.

 

[ilumo]

I imagine there's quite a bit of driveline loss with the GX. If a stock GX breaks 300 whp that'd be seriously impressive. I'd imagine it'll put down 280 - 290 whp assuming ~20% driveline loss. I'm sure someone will dyno one eventually. If there's ever an ECU tune available, you'll start seeing them on the dyno.

I believe there were some piggy back tunes people were using. Jb4 or something like that. There was no dyno info in that thread though.