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JB4 Tuner? 🤔

jrmosher

New Member
First Name
Justin
Joined
Sep 13, 2026
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Location
Ann Arbor
Car(s)
2027 RZ34 Gun Metallic Sport
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Auto Detailer
Just purchased a 27 Sport a few weeks ago. Was daily driving a Mustang GT for the last 3 years. Ive added an AWE track exhaust to the new Z and wanted to plug in a JB4 tuner after i hit the 1200 mile mark to up the HP and torque just for normal driving as im more used to a 500 hp car and the stock z setup is a little too sluggish for me.
Has anyone had any bad experiences with this tuner, and can i run it on a Map 3 tune (5.5psi boost) with 93 octane without adding anything else to the car?
 

Tranzor Z

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First Name
Steve
Joined
May 6, 2025
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Location
Texas
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2024 Nissan Z
Stillen Trucontrol all the way. Heard nothing but bad things about JB4.
 
 






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