Tapout Tuning

LF4 Performance Tuning Specialists

JB4 Tuner Kit
Wireless smartphone kit
OBD2
Made in U.S.A.

JB4 Tuner*

$579.99

IN STOCK! Your order will ship today if it’s before 3:00 Ohio time on a business day, or next business day otherwise.

This wireless mobile smartphone kit is what allows you to connect to your JB4 device so that you have access to your tune files.

Category:

Description

This plug and play tuner attaches to easy to access sensors in the engine bay and works with your factory ECU tuning to remap your boost, timing, and fueling for optimal performance and reduced turbo lag. See the bottom of this page for a few of our installation tips. 

Installation is very discrete and unlike flash remaps which are quick to install but can never be fully removed with a JB4 the vehicle is never aware it’s making more than the factory boost or power levels. Fuel economy during normal driving is unchanged and it’s compatible with all driving modes including towing.

Unlike other less advanced systems, the JB4 includes CANbus functionality allowing it to take in critical engine data directly from the ECU for real-time tuning. The data includes pedal position, throttle position, timing advance, fuel trims, air/fuel ratio, engine knock, fuel trims, gear, and much more. Other tuners without CANbus are not able to even monitor this critical engine data no less incorporate it real-time into their tuning algorithms. CANbus allows the JB4 to provide huge power increases with unparalleled power delivery.

The JB4 includes multiple maps including those for 91 octane, 93 octane, factory tuning, VALET mode, E85 mixtures, and unleaded race gas. In addition, it offers boost by gear settings to improve launches, the ability to read and delete fault codes, and much more. The JB4 is made in the USA and includes a 5-year warranty.

Wirelessly connect the JB4 for the Cadillac CT4/CT5 to your Bluetooth 4.0 compatible iOS and Android device via the JB4 Mobile connect kit, or to your Windows laptop with the BMS data cable. Both options allow you to record and analyze vehicle and tuning data, change JB4 performance maps, and update JB4 firmware as we release free newer versions with updates, more powerful maps, and new features under development. Separate JB4 Mobile app purchase also required.

We include four separate calibration maps, ranging from approximately 440 to 515 whp.

*JB4 cell phone app is available for $27.99 on all smart devices*Made in U.S.A.

 

Check out our Dyno Chart below for our in-house dyno testing with the JB4 Tuner:

Chuck's JB4 Dyno Chart

Check out JB4s in-house CT5 Dyno Chart:

CT5 JB4 Dyno Chart

Installation:

You will need to connect to three sensors under the hood.  One is for the driver side MAF sensor, which is mounted in the intake system.  The MAP and TMAP sensors are located at the rear of the intake manifold.  For those, you will need to remove the engine cover, then loosen the bolts holding the black plastic vacuum assembly in place.  This will give you access to the MAP and TMAP sensors. 

For the OBD2 connector, you can run the wire through the door jamb for a quick and dirty installation. For a more professional and permanent installation, we remove the wiper cowl, allowing easier access to the firewall.

Feel free to post in the ATS-V | CT4-V Blackwing Performance group on Facebook if you need more help.  Many CT4-V Blackwing owners have already installed these and you may be able to get tips and tricks if needed, even after hours, on the weekend, etc.  If you prefer to speak with someone directly during normal business hours, just give us a call on our office line and ask for Jorge.  He can walk you through the process.

Applications:

  • 2021 – 2023 Cadillac CT4 2.0L & 2.7L Turbo
  • 2021 – 2023 Cadillac CT5 2.0L & 3.0L Turbo
  • 2022 – 2023 Cadillac CT4-V Blackwing 3.6L Turbo

*You will need to purchase the JB4 cell phone app. Available for all smart devices.*

 

6-Cylinder Installation Guide (2022 CT4-V Blackwing)

4-Cylinder Installation Guide (2021+ CT4 2.0L $ 2.7L Turbo / 2021+ CT5 2.0L & 3.0L Turbo)

CT4-V Blackwing: JB4 Tuner

Yes, all driving modes will work the same as they do now. Below 3,000 rpm, the car will feel completely stock in all modes. Above 3,000 rpm, you’ll have more boost and power than before.
The JB4 does not change any factory ECM settings. So you can easily remove the JB4, leaving no trace behind.
No.
No, we still don’t have ECM access, so there is no way to disable DTCs or eliminate Check Engine Light with aftermarket downpipes yet.
There is no way a dealership would be able to detect the JB4 had been previously installed.
RR12YS or RR12S will work fine. RR12YS may last a little longer. RR12S will perform a little better.
Yes, we pre-gap them to .027”. However, the gaps should be double checked prior to installation.
We will include separate calibration maps for 91, 92 and 93 octane. You can switch between them in very easily via the JB4 cell phone app.
We’re still working on finalizing all the details for our Purple and Brown Belt Performance Packages, which will run E85 fuel.
You can deselect any items you already purchased when you place your order.
You can install it yourself, or you could bring the car to our shop here in Ohio if you prefer.
https://www.tapouttuning.com/frequently-asked-technical-questions-for-ct-4-blackwing/We have not tested the JB4 tuner in extreme temperatures. However, we have tuned the same LF4 engines in hundreds of ATS-Vs all over the world. Many are in Dubai, and that’s one of the hottest regions in the world. Plus, the CT4-V Blackwing has a significantly improved cooling system. You can learn more about that HERE.
They are completely distinct products from different manufacturers, with different electronics, different software, different sensor taps, different user interface and different custom tuning ability. The only thing they have in common is that they both allow the cars to be tuned outside of the ECM.
We have been working on our in house dynamometer, and have completed 225 full throttle Blackwing pulls to date. We have spent considerable time and effort testing and validating the JB4 product for the CT4-V Blackwings, and are currently developing and refining their calibration maps for the perfect combination of increased power, while still retaining safety and reliability. Other tuners who haven’t done the proper testing may elect to turn the knobs up higher than we do, but they don’t really care about the longevity of your engine.
If you want to create your own calibration, you can use Map 6 and edit via your cell phone app.
Don’t worry. We can take care of your engine replacement on site 😉
We’re working on it right now, but cannot give a precise E.T.A. at this time.
When you’re not in the gas, the tunes will perform identical to stock. So the car will still be totally fine on long road trips.
Bolt-ons do not typically increase horsepower for untuned CT4-V Blackwings, since the ECMs are torque based. If you install something that helps the engine to flow more air, the ECM just commands a little less boost, and power output remains the same. This is why all our CT4-V Blackwing Performance Packages include both parts and tuning.

WARNING: This is a RACE ONLY product manufactured and sold for installation on vehicles to be used solely for competition purposes. Once this part is installed, the vehicle may never be used, or registered or licensed for use, on a public road or highway. If you install this part on your vehicle and use the vehicle on a public road or highway, you will violate the Clean Air Act 203(a)(3), 42 U.S.C, 7522(a)(3) and may be subject to personal civil or criminal liability, including fines of up to $4,819 per day. Not for sale or use in California.

Additional information

Weight 5 lbs
Dimensions 12 × 12 × 12 in

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