JDI Welcome to JDI (Justin Durand Ignition & Tuning), located in Rapid City, South Dakota.
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We offer fully programmable "plug & play" custom ignition systems for snowmobiles; including mobile DynoJet chassis/track dyno services to the Midwest.

08/29/2026

Winter must be on racers minds!

We've been getting a LOT of requests thru Messenger, for upcoming Fall track dyno tuning. I have yet to firm dates, but tentatively looking at coming back to WI at the end of October, or beginning of November.

At JDI, we utilize the latest retrofit DynoJet Track Dyno upgrades from Troy at Xtreme Dyno LLC with their heavy 400 # drum, bearings, and software. In addition for 2-strokes, if you have -4AN Male fittings TIG welded into your pipe center sections, we can also monitor individual pipe back pressure too.

JDI put multiple teams in the winners circle last year, at some of the premier Midwest snow drag events. These sleds came straight off our track dyno.

We have spent the last 2-seasons carefully studying data, and power management on various snow surface conditions. This allows me to mimic the setup we are looking for on the dyno, so we have real world results in the field. We are not interested in chasing "big horsepower numbers", with unrealistic clutching setups. Instead, we'd rather achieve the most usable track horsepower we can in the field, for consistent repeat runs, and 60' power management. This allows our customers to make minor fine tuning changes at the track if needed, based on the changing surface.

We look forward to seeing some of our repeat customers and friends, along with some new faces this season!

Our JDI, ProX 55 "Snow Drag" Yamaha Vmax-4, 2-stroke Turbo Build is about ready!Will it have what it takes to compete at...
08/26/2026

Our JDI, ProX 55 "Snow Drag" Yamaha Vmax-4, 2-stroke Turbo Build is about ready!

Will it have what it takes to compete at the highest level...time will tell. ;)

This hot summer heat seems to have many thinking about cooler days, and winter!I've been very busy in the JDI shop build...
07/19/2026

This hot summer heat seems to have many thinking about cooler days, and winter!

I've been very busy in the JDI shop building new ignition systems for our customer's... I'm finally starting to see some light at the end!

This is a new JDI standalone system, I just completed today. It's for a Polaris watercraft bottom-end triple, using a '96-'97 Ultra OEM ignition system and electronics. I built this system to the customers specific length requirements, along with the correct connector for the Polaris Ultra crank sensor pickup. The customer is also upgrading to the MSD 42921 coils, so we have the appropriate connectors already terminated.

Just wiring a monster, and we officially have spark! Fuel pump relay, data logger, electric water pump, electronic boost...
06/25/2026

Just wiring a monster, and we officially have spark! Fuel pump relay, data logger, electric water pump, electronic boost controller and turbo oil pump are all that is left to wrap this up, maybe another 4-5 hours...tick toc

04/19/2026

Something a little different, beyond the normal 2 skis and a track...check out Casey Hauck Performance (Casey and Davin) with their new 250cc kart. JDI has been working with them on the ignition system setups for a few years now. With their tuning skills and Davin's driving skills, they have been racking up the wins all over on the track!

This season, they will be racing a 250cc and a new 500cc "Widowmaker" powered kart!

Both karts feature our JDI "total loss" ignition systems with MSD 42921 coils, MSD plug wires, 3D mapping with TPS, and controlled electronic Power Jet all through the ECU.

04/13/2026

Congrats to Aaron and Nicky Pisa with their "JDI Powered" 800cc Twin Polaris. They took multiple class wins at the MESC Giants Ridge Hill Drag event!

This sled features our first JDI-SFI individual cylinder firing ignition system for the Polaris Twin...no batch firing, no waste spark!

04/08/2026

A little more wiring to finish for the datalogger and electric pumps. Then pull out the rouge bars and buffing wheels...it's almost ready to put in some work on the JDI Mobile Track Dyno!






🔥🔥🔥NEW PRODUCT ALERT!🔥🔥🔥*** Polaris XCR 800 Owners***This is our new JDI coil adapter, for MSD 42921 coils! This allows ...
04/03/2026

🔥🔥🔥NEW PRODUCT ALERT!🔥🔥🔥

*** Polaris XCR 800 Owners***

This is our new JDI coil adapter, for MSD 42921 coils! This allows direct plug-in with the correct rubber triangular connector to the OEM wiring harness; for upgrading from "stock coils" to the MSD 42921 coils. This adapter can also be used on the JDI Polaris XCR 800 wiring harness!

No cutting and ugly butt-connecting on the stock harness, plug and go! Comes terminated with correct connectors for MSD coils, and heavy common 14-AWG ground wire. We can build these to your desired length specification. $74.95, includes shipping

Custom length MSD 8.5mm spiral core wires??? We can handle those as well...fully terminated and tested!

As the winter race season comes to a close, we want to say a special thank you, to all of our "JDI Powered" customers fo...
04/01/2026

As the winter race season comes to a close, we want to say a special thank you, to all of our "JDI Powered" customers for such a successful race season!

Whether it was snow drags, speedruns, or JDI track dyno tuning; our customers had so many victories in various platforms and organizations.

There is no off-season for JDI...this is the time when we innovate, improve, and put in the hours to get our customers faster! One thing is for sure...you haven't seen anything yet. Tic Tock.

Address

Summerset, SD
57702

Opening Hours

Monday 9am - 5pm
Tuesday 9am - 5pm
Wednesday 9am - 5pm
Thursday 9am - 5pm
Friday 9am - 5pm

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