JHM TCU (Port Flash) – Automatic Trans Tuning for D3 S8 V10

NOW AVAILABLE FOR DIY PORT FLASHING OR AT A JHM DEALER VIA OUR NEW POWER CONNECT SERVER AND CABLE.

JH Motorsports is pleased to offer the JHM TCU Automatic Transmission Tuning for the D3-S8 V10 to fully complement your JHM ECU tune.

The JHM TCU Tuning for your Automatic D3-S8 V10 makes your Tiptronic Transmission shift faster and harder. We firm up the shifts to give a clean and crisp gear change that is faster and firmer than the stock characteristics but still not too abrupt. We feel our JHM TCU Tuning makes the car shift how it should have from the factory. It gets rid of the sloppy and slow slipping of the OEM TCU calibration and replaces it with firm, crisp, shifts. This allows you to get the most out of your Tiptronic by allowing you to put the power to the ground faster.

VIDEO of our 12 second pass with our ECU and TCU software on a C6-S6 V10 which has the same engine and transmission as the S8

Our TCU Tuning not only speeds up the shifting on upshifts JHM also modifies the downshifting characteristics and the behavior in “Tip Mode” to make the car more performance oriented while still being very streetable. We also improve the downshifting as well, we have been told it feels “less clunky”.In our development for the TCU tuning we made a few different calibrations that could make the transmission shift harder, but we found that this made the car feel too much like and old muscle car, and less like an Audi.

When you increase the power of the vehicle, the slipping and sliding of the OEM calibration will prematurely wear out the transmission. While it may be comfortable, the slipping of the transmission means that all of the clutch packs in your transmission are doing more work and slipping more, wearing out faster. The faster and firmer shifts prevent this wear by decreasing or eliminating the slipping.

Required:

-JHM ECU Tuning

Recommended Supporting Modifications: 

-JHM Intake Spacers

UPDATE 4-1-21: All C6 S6 V10s and D3 S8 V10s use ONLY the one POWER CONNECT cable to flash BOTH ECU and TCU. So if you have one of these cars do NOT buy the OLDER TUNING flash cable. This is the ONE and ONLY cable you ned to do BOTH ECU and TCU.

For Flashing Method, select “Flash Myself, SEPARATE POWER CONNECT Cable Purchase Required, CLICK LINK BELOW” if you’re going to be buying a cable from us and flashing your car on your own. You’ll need to add this option.

GO HERE FOR JHM POWER CONNECT CABLE

and add to your cart after adding the tune, just selecting the option is NOT enough. Make sure you have THOROUGHLY read through the instructions and are confident that you can set your computer up correctly. If you select this option for your tune, you must select a shipping method for your order so we can ship you a JHM Tuning-Flashing Cable. Please select a shipping method once you’ve added the tuning and the flashing cable to your cart. Instructions for installing the flashing software on your computer will be emailed to you after purchase.

If you already have a JHM POWER CONNECT Cable, select “I already have a JHM POWER CONNECT Cable.” **NOTE: This is a proprietary cable with drivers specific to our Flashing Software so you must make sure that you have a JHM POWER CONNECT Cable, NOT just a generic USB Vag Com cable.** After receiving your paid order, we will send you an authorization form which we will use to create your JHM Tuning Flash Browser account and login information. This is the information you will use to access our server and flash your car with the JHM Tuning-Flashing Cable that you already have.

DISCLAIMER: JHM is now using proven flashing technology in order to get our tunes on our customers’ cars in the quickest and most convenient way possible. You will be installing a proprietary JHM software that works ONLY with our flash cable (supplemental software such as Microsoft .net may be required). This program is what allows you to detect your ECU part number, fill in your information, select the correct program based on your hardware and then write JHM Tune to your ECU all through your OBD II port. Both of these programs are highly specific when it comes to configuring your computer to run them properly. While every effort has been made to clearly and completely explain this configuration in our instructions, the customer will ultimately be responsible for removing or disabling their own or third party anti-virus software or firewalls that will block the port required for you to log into our flashing server (see the link to our instructions below to determine whether or not this is something you’ll be able to do). Basic technical support provided by JHM to help install these programs on your computer, diagnose programs with your computer, and/or internet connection may be subject to an hourly fee. Additionally, if something happens to your ECU during the flashing process, you should be able to restore it using our software. If you are still unable to make the ECU flash properly, you will be responsible for all costs associated with restoring your ECU and fixing the issue.

Requirements for Tune: 
– Windows computer with at least 1 USB (Universal Serial Bus) port 
– Wired Broadband Internet Connection (wireless can be unreliable) 
– JHM Tuning-Flashing Cable (Flash cable length cannot extend beyond 10 ft long unless a powered USB hub is installed in-line. 
– Battery Charger or equivalent power source capable of sustaining a 40 amp charge

You can download and view the instructions HERE to determine whether or not this is something you would like to do.

If you would like to get tuned at our location in Lathrop, CA please give us a call to schedule an appointment! If you’d like to get tuned at a JHM dealer close to your location, you can find one using our Dealer Map by clicking the “Dealers” Tab at the top of this page. You will need to contact your preferred dealer directly and schedule a tuning appointment with them. You shouldn’t be charged more than an hours’ worth of labor for your JHM Flash.

Our dealer network is large and growing daily. If we do not have a dealer within an hour drive of your location, we will do everything possible to build a new relationship with a shop close to you on your behalf. Please contact us for more information.

For shipping quotes: Please sign in or join then put the items you want in your shopping cart and proceed to checkout. If you are looking to purchase other products at the same time as your tune, please do so on a separate invoice.