# Want to Buy T4 controller **URL:** \ **Category:** Buy, Sell, & Trade\ **Created:** [November 2, 2022, 9:56pm UTC](https://community.electricforum.com/t/want-to-buy-t4-controller/25368 "2022-11-02T21:56:03Z")\ **Posts on this page:** 14\ **Page:** 1
**Author:** ![BuckeyenDE](https://avatars.discourse-cdn.com/v4/letter/b/779978/32.png) [@BuckeyenDE](https://community.electricforum.com/u/BuckeyenDE)\ **Post date:** [November 2, 2022, 9:56pm UTC](https://community.electricforum.com/t/want-to-buy-t4-controller/25368/1 "2022-11-02T21:56:03Z")
I have a 2005 GEM e4 and just installed 22Sdi Lithium with a MM and apparently my T3 controller is preventing me from getting faster speed. I am getting 30MPH and would like 35 or more. I am in Delaware, please let me know if you have one to sell. ---
**Author:** ![JarJarJava](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/jarjarjava/32/15158_2.png) [@JarJarJava](https://community.electricforum.com/u/JarJarJava)\ **Post date:** [November 4, 2022, 12:00am UTC](https://community.electricforum.com/t/want-to-buy-t4-controller/25368/2 "2022-11-04T00:00:35Z")
Fyi, you have to jumper power over to a pin to go from a T3 to a T4. I can not recall which offhand though. If you search on here there should be a thread on it ---
**Author:** ![AssyRequired](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/assyrequired/32/7621_2.png) [@AssyRequired](https://community.electricforum.com/u/AssyRequired)\ **Post date:** [November 4, 2022, 4:03pm UTC](https://community.electricforum.com/t/want-to-buy-t4-controller/25368/3 "2022-11-04T16:03:33Z")
I’m curious what the specs are on your car? Need more info **Your car** 2005 e4 – ✔ T3 – ✔ SDI22 – ✔ Motor --? Gearbox --? Tire height --? Magic Magnet – Y/N? That 05 car was a transition car and it (probably) has 12.44 gears. ← verify? If running 21 in tires(guessing) @ 30mph that motor is spinning 6k. Your motor may just not have any more zip to go faster. (Hopefully it is not a GE short). Running the same numbers it would take 7k to move the car @ 35mph If going to T4, Pin 13 needs to go to B-. Search the archives for Pin 13 if need more info. ---
**Author:** ![Inwo](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/inwo/32/1067_2.png) [@Inwo](https://community.electricforum.com/u/Inwo)\ **Post date:** [November 4, 2022, 4:20pm UTC](https://community.electricforum.com/t/want-to-buy-t4-controller/25368/4 "2022-11-04T16:20:13Z")
I have a fix on the shelf looking for a tester. Old school field shunt to increase speed. In theory shunting 10% or so of the field current will allow higher speed. Put something together several years ago but no takers. Another way is an internal spoof of control shunt to fool controller into supplying less current. Easy in theory but could make the controller unrepairable. Need a risk taker. I measure 34 ohms 5hp GE that MikeKc dropped of. That is only 2 amps full field. Seems wrong, but is what it is. In anycase, I have a 25% reduction wired to a switch. Push the switch at full speed to lower field strength. See what blows up. 😬 ---
**Author:** ![Gem\_e2](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/gem_e2/32/1849_2.png) [@Gem\_e2](https://community.electricforum.com/u/Gem_e2)\ **Post date:** [November 4, 2022, 5:54pm UTC](https://community.electricforum.com/t/want-to-buy-t4-controller/25368/5 "2022-11-04T17:54:06Z")
hi Inwo did you try that T3 file to get higher rpm ? ---
**Author:** ![Inwo](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/inwo/32/1067_2.png) [@Inwo](https://community.electricforum.com/u/Inwo)\ **Post date:** [November 4, 2022, 6:07pm UTC](https://community.electricforum.com/t/want-to-buy-t4-controller/25368/6 "2022-11-04T18:07:55Z")
I keep forgetting. Maybe i can talk someone onto trying it. Tnx ---
**Author:** ![BuckeyenDE](https://avatars.discourse-cdn.com/v4/letter/b/779978/32.png) [@BuckeyenDE](https://community.electricforum.com/u/BuckeyenDE)\ **Post date:** [November 4, 2022, 6:09pm UTC](https://community.electricforum.com/t/want-to-buy-t4-controller/25368/7 "2022-11-04T18:09:22Z")
Original 5HP motor and gearbox, 21.- 21.5 tires at 35PSI with a MM ---
**Author:** ![Inwo](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/inwo/32/1067_2.png) [@Inwo](https://community.electricforum.com/u/Inwo)\ **Post date:** [November 4, 2022, 6:15pm UTC](https://community.electricforum.com/t/want-to-buy-t4-controller/25368/8 "2022-11-04T18:15:17Z")
Send it to me of you want to try new sw. Untested though so may hot have a good result. In general i dont like to reprogram, as sometimes controllers are dead on there feet and die after shipping. ---
**Author:** ![Inwo](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/inwo/32/1067_2.png) [@Inwo](https://community.electricforum.com/u/Inwo)\ **Post date:** [November 4, 2022, 6:16pm UTC](https://community.electricforum.com/t/want-to-buy-t4-controller/25368/9 "2022-11-04T18:16:26Z")
My computer died a while ago.hope i can find the file. ---
**Author:** ![AssyRequired](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/assyrequired/32/7621_2.png) [@AssyRequired](https://community.electricforum.com/u/AssyRequired)\ **Post date:** [November 4, 2022, 6:29pm UTC](https://community.electricforum.com/t/want-to-buy-t4-controller/25368/10 "2022-11-04T18:29:12Z")
Does your gearbox still have a barcode label on top? Can you post a clear pic of the number? Motor - Which one? Note the position of the cable connections (A1-A2, F1-F2) Thick aluminum ring at the gearbox on Short motor The band clamp that wraps around the brush inspection ports on Long motor Also- When was the last time you had your motor off/blown out/serviced? ![GE5 Short & Long](https://canada1.discourse-cdn.com/flex030/uploads/electricforum/original/2X/b/b8ad7b92730f86539a14aac9ba1aaf11573476b1.jpeg) ---
**Author:** ![BuckeyenDE](https://avatars.discourse-cdn.com/v4/letter/b/779978/32.png) [@BuckeyenDE](https://community.electricforum.com/u/BuckeyenDE)\ **Post date:** [November 4, 2022, 7:55pm UTC](https://community.electricforum.com/t/want-to-buy-t4-controller/25368/11 "2022-11-04T19:55:03Z")
![20221102_133436.jpg](https://canada1.discourse-cdn.com/flex030/uploads/electricforum/original/2X/5/588e1776fc6adcde23afb123755cc5f19948dbb3.jpeg) I have had the GEM 3 years, it was originally military, the municipal, I have never taken it apart. Looks like the short motor ---
**Author:** ![AssyRequired](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/assyrequired/32/7621_2.png) [@AssyRequired](https://community.electricforum.com/u/AssyRequired)\ **Post date:** [November 4, 2022, 8:05pm UTC](https://community.electricforum.com/t/want-to-buy-t4-controller/25368/12 "2022-11-04T20:05:00Z")
Ok- Thanks. There is a label down on your transmission that I would like to see. If still there it would look much like this: ![trans code2](https://canada1.discourse-cdn.com/flex030/uploads/electricforum/original/2X/7/7d453d9fa8f6a9ed8288df64b25a8e2727b08d09.jpeg) ---
**Author:** ![BuckeyenDE](https://avatars.discourse-cdn.com/v4/letter/b/779978/32.png) [@BuckeyenDE](https://community.electricforum.com/u/BuckeyenDE)\ **Post date:** [November 4, 2022, 8:23pm UTC](https://community.electricforum.com/t/want-to-buy-t4-controller/25368/13 "2022-11-04T20:23:37Z")
![20221101_130959.jpg](https://canada1.discourse-cdn.com/flex030/uploads/electricforum/original/2X/2/2358d1d2c02c842a40c52eb015b653761ceac45a.jpeg) ---
**Author:** ![Inwo](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/inwo/32/1067_2.png) [@Inwo](https://community.electricforum.com/u/Inwo)\ **Post date:** [November 4, 2022, 9:25pm UTC](https://community.electricforum.com/t/want-to-buy-t4-controller/25368/14 "2022-11-04T21:25:02Z")
If @AssyRequired will assist, I can send you what’s needed to program and test. A T3 mule as well that needs testing. Or anyone?