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Re-flashing your ECU has never been easier. All you have to do is send us your ECU to:

Guhl Motors
102 S. State St.
Ephrata, PA. 17522.

Inside the box with your ECU, make sure to include your name, phone number, email, and return shipping address. Once we recieve your ECU, we will contact you to go over the options for the re-flash, and lastly, payment information. Once we’re done, we can send your ECU back to you and you can feel the Guhl derestriction difference!

Disclaimer- All Guhl motors products are for racing use only and may not be legal on public roads


Most frequent questions and answers

It is reprogramming the computer code in the ECU (Engine Control Unit) to change the operation of the engine control system. It is called reflashing because the memory where the code is stored is a special type of memory called Flash Memory. The process of reprogramming the Flash Memory is dubbed Reflashing. 

The factory programming in the ECU is designed to meet many regulations for emissions, fuel mileage, and noise requirements. These requirements often reduce the overall performance of the engine, and make throttle response sluggish and rough. Improved programming can optimize performance by removing these restrictions, providing an overall better riding experience.

The specifics vary from one ECU to another, but the basics are similar. Most changes include the following.

  • Derestriction For Full Power In All Gears
  • Speed Limiter Removal
  • Raised Rev Limit
  • Deceleration Fuel Cut Removal
  • Custom Ignition Timing Mapping
  • Custom Fuel Mapping
  • Derestriction Of The Secondary Throttles Or Throttle-By-Wire System
  • Raise/Lower Idle Speed
  • Lower Fan Operation Temperature
  • Error Code Removal For Exhaust Servo Removal, PAIR Valve Removal, O2 Sensor Removal, EVAP Valve Removal
  • Provide The Ability To Change Power Modes And Traction Control Modes “On-The-Fly” and Remember The Power And Traction Settings.


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The content of the pages of this website is for your general information and use only and it is subject to change without notice. Neither we. nor any third parties, provide any warranty or guarantee as to the accuracy, timeliness, performance, completeness or suitability of the information and materials found or offered on this website for any particular purpose. You acknowledge that such information and materials may contain inaccuracies or errors and we expressly exclude liability for any such inaccuracies or errors to the fullest extent permitted by law. Your use of any information or materials on this website is entirely at your own risk, for which we shall not be liable. It shall be your own responsibility to ensure that any products, services or information available through this website meet your specific requirements. This website contains material which is owned by or licensed to us.

Vehicle racing is inherently a dangerous sport with significant risk of person injury or even death. When a user participates in vehicle racing, he accepts the risk inherent therein. GUHL MOTORS makes no warranty that the use of its products or parts guarantees personal safety or freedom from physical injury or operates as a life saving device.

GUHL MOTORS products and parts are sold “AS IS” without any warranty whatsoever. Express warraties, Implied warranties, Warranties of merchantablility and warranties of fitness for a particular purpose are excluded. The entire risk of quality and performance of such products and parts is with the buyer, user subsequent user, or agent thereof (Herein “User”). Should such products or parts prove defective following their purchase, the buyer and not the manufacture(s), distributor(s), or retailer(s), assume the entire cost of all necessary services or repair.

GUHL MOTORS disclaims all liability for any special, direct, incidental or consequential damages, or any damages whatsoever, including, without limitation, the loss of life or limb, or damages due to bodily or personal injury, which may arise or result from the sale, installation, or use of any of its products and parts. 

It is the user’s responsibility to inspect and verify the dimensions, specifications, and performance of all products and parts as being appropriate for the use to which the user will put them prior to any actual installation and/or use of said products and parts. 

GUHL MOTORS products and parts are to be inspected by the user before each use for evidence of damage, defect, or wear. Any deviation by the user from the manufacturer’s specifications concerning use, maintenance, repair, alterations and modifications constitutes willful negligence. 

The installation of GUHL MOTORS products or parts may adversely affect other vehicle components, safety equipment or manufactured goods (collectively “goods”). GUHL MOTORS  assumes no responsibility for any damage to other goods, or bodily injury that may arise due to failure of other goods, due to installation and/or use, either proper or improper, of its products or parts. 

The liability of GUHL MOTORS is limited to the replacement of defective products or parts found under examination by manufacturer to be defective in material or workmanship within 60 days after purchase, and which has not been caused by an accident, improper use, alteration, tampering, excessive use, misuse, modification or abuse. The damage of the user shall be deemed liquidated in the costs of replacement of the product or part. 

GUHL MOTORS assumes no responsibility for errors, omissions, diagrams, pictures, illustrations or text in these instructions or the documents contained herewith. 

By purchasing or using this product, the user agrees that if any provision of this Disclaimer is held to be illegal, invalid or unenforceable under present or future law, such provision shall be fully severed from the Disclaimer and this Disclaimer shall be construed and enforced as if such illegal, invalid or unenforceable provision never comprised a part hereof, and the remaining provisions hereof shall remain in full force and effect and shall not be affected by the illegal, invalid, or unenforceable provision, there shall be added automatically as part of this Disclaimer a provision as similar in its terms to such illegal, invalid or unenforceable provision as may be possible and be legal, valid and enforceable.