The ECU Guy

The ECU Guy Hey welcome to my page! I specialize in Honda 1989-2010s era ECU's, and other electronics. High end, high quality, and visually appealing work.

If you want high quality electronics, you've come right the right shop! I carry tuning supplies, and more!

06/19/2026

SHANE MADSEN // 1998 HONDA CIVIC EK HATCHBACK

Built with one goal in mind—putting down serious power while keeping the proven B-series platform alive and well. Shane Madsen's '98 Civic EK hatch combines a forged B-series engine, Garrett 62mm turbocharger, and VP110 fuel to produce an impressive 488 WHP and 329 lb-ft of torque. Supporting the combination is a Hondata S300-equipped ECU built by The ECU Guy, featuring electronic boost control and custom replacement IC upgrades. Support by Herse-Tuning.TM. A SnakeTuning Inc Mini Dizzy and custom harness package help modernize the ignition system, while Manley rods, Wiseco pistons, and a Supertech valvetrain provide the strength needed to handle nearly 500 wheel horsepower. Fresh off the dyno, this EK proves that a well-sorted B-series setup can still deliver big results.

OWNER: Shane Madsen
VEHICLE: 1998 Honda Civic EK Hatchback
ENGINE: Turbocharged B-Series
POWER: 488 WHP / 329 WTQ
TURBO: Garrett 62mm
FUEL: VP110
ENGINE INTERNALS: Manley Rods, Wiseco Pistons
CYLINDER HEAD: Supertech Valvetrain
ENGINE MANAGEMENT: Hondata S300 ECU by The ECU Guy
FEATURES: Electronic Boost Control, Custom IC Upgrades, Snake Tuning Mini Dizzy, The ECU Guy Custom Mini Dizzy Harness

K series ECU failures?Here at The ECU Guy, we don't take board swaps lightly. If you've got a Kpro ECU that's taken a hi...
06/19/2026

K series ECU failures?

Here at The ECU Guy, we don't take board swaps lightly. If you've got a Kpro ECU that's taken a hit, I'll give it an honest inspection. I've got the knowledge to diagnose and source specialized parts you need to get it running again. Success rates are around 80% with repairs like this. If I am unable to get your board up and running, we then move on to replacement boards, and there will be no charge for the unsuccessful unit.

06/14/2026

IC17 ✅
Big surprise in the works that's about to flip the script. What has been considered an impossible engineering feat, we made it happen.
Stay tuned! 🤓

Skip the wait and own a ready-to-ship ECU from The ECU Guy.Because most of my time is spent building customer orders, I ...
06/13/2026

Skip the wait and own a ready-to-ship ECU from The ECU Guy.

Because most of my time is spent building customer orders, I rarely have completed ECUs available for immediate purchase. Everything is normally built to order, which means a wait time. This one is ready to go today.

Up for sale is an exceptionally clean, fully refurbished PR4 ECU, professionally prepared for Hondata S300 or Snake Emu use right out of the box.

This is a desirable 1720 revision ECU, known for being one of the more sought-after Honda OBD1 board revisions. It also retains the unique OEM PR4 outer case, making it a neat piece for Honda enthusiasts and collectors alike.

Originally, the PR4 was calibrated for a non-VTEC B18 application. This unit has been upgraded with several modern enhancements, including:
✅ Full ECU refurbishment
✅ Solid-state capacitor conversion
✅ Electronic boost control
✅ VTEC conversion
✅ Hondata S300 / Snake Emu ready
✅ The ECU Guy transparent top cover
✅ Lifetime warranty details documented inside the case

One of the highlights of this ECU is the solid-state capacitor system I've developed and installed. Unlike traditional electrolytic capacitors, these components do not leak and offer significantly improved long-term reliability. Required board modifications have already been completed.

Also included is an optional The ECU Guy custom SST chip, configured for the Hondata-style socket footprint. A startup basemap can be programmed upon request.

Pricing:
$580 – Includes SST chip and basemap
$550 – ECU only
If you've been wanting a professionally built ECU without the usual wait time, this is a great opportunity.

Another pair of P28's heading out!Alpha QM1 QM2 replacements S300 V1 battery replacement Refurbished, fixed, and ready t...
06/11/2026

Another pair of P28's heading out!
Alpha QM1 QM2 replacements
S300 V1 battery replacement
Refurbished, fixed, and ready to roll for years to come!

Results from our last sweepstakes winner. Jeff Revline heading out. Another sweepstakes could be right around the corner...
06/09/2026

Results from our last sweepstakes winner.
Jeff Revline heading out.
Another sweepstakes could be right around the corner, so stay tuned 😉

First order of test OneRoms are ordered. Shipping will be around 2 weeks. If the first units are successful in testing, ...
06/09/2026

First order of test OneRoms are ordered.
Shipping will be around 2 weeks. If the first units are successful in testing, I can start placing orders, as well as drop the files to my GitHub. For diy orderers/builders, I have successfully updated the BOM file to make ordering seamless. More details and instructions after test units are ready. There are a few minimal parts that will need ordered and installed separately being the USB and the pin headers.

On a side note, my main relay upgrade final board revision is almost here, and expected to arrive this week, more on that soon😁

The ECU Guy Consistency, reliability, confidence 💪
06/08/2026

The ECU Guy
Consistency, reliability, confidence 💪

Broke a pin on your emu? Send it in, I fix all emus, and can diagnose complex electronic issues. Repairspin swapsupgrade...
06/06/2026

Broke a pin on your emu?

Send it in, I fix all emus, and can diagnose complex electronic issues.

Repairs
pin swaps
upgrades and more

Ordering the first test batch soon. The total cost for my first batch of 5 assembled boards will be approximately $150-$...
06/05/2026

Ordering the first test batch soon. The total cost for my first batch of 5 assembled boards will be approximately $150-$250 USD, not per unit. JLCPCB has a minimum order quantity, so I have to purchase multiple boards at once for testing.
This project is based on the open-source OneRom platform and incorporates Alpha Tuning's firmware update, along with my own hardware layout changes to better fit the Honda tuning community. Once testing is complete, the design files will be available on GitHub for anyone who wishes to build their own.
These will not be available until I have personally tested and verified the design.

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1035 E Greenbriar Road
Vinita, OK
74301

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