I recently bought a Dynojet 224XLC in ground chassis dyno and installed it in my garage at home. I normally rent out time on it for $100 and hour, but anyone here is welcome to rent it for $50 an hour. AFR and eddy brake use are included in the price. Located just outside Raleigh, NC in Clayton, NC.

No time restraints, no gaggle of on-lookers, no shop employees staring at you silently wishing that you'd get out so they can go home, etc... Assuming you can maintain traction on the drum, the dyno will read unlimited torque and horsepower. I've had a handful of cars in 900-1000 RWHP range on it and haven't had an issue with traction. I'm sure I'll have that problem eventually, but so far so good for now. Maximum wheel speed is 200 MPH.

My dyno is what most people think of when they hear the word dyno, a 24 inch diameter knurled drum recessed into the floor. The drum weighs approximately 3000 lbs, and the dyno software is able to calculate horsepower and torque from the rate at which your car can accelerate the drum. This is typically called an "Inertia Dyno" and is the vast majority of whats out there. However, my dyno has an electronic eddy brake attached to the drum. This option nearly doubles the cost of the dyno, which is why you don't see very many dynos with electronic load control in the wild.

Some of the benefits of the eddy brake are:

-Chances are your car doesn't accelerate down the road the exact way that it will accelerate a 3000 spinning drum. You can enter the vehicle weight, frontal area, and drag co-effcient into the dyno software; and the electric brake will apply additional load based on the weight of the car and wheel speed. This simulates driving down the road / track. I have tested it on my car based on how long it takes me to go from 2000 RPM to 7000 RPM on the road, and then again on the dyno. The difference is less than half a second over a 16 second test.

-The eddy brake lets you place the engine under the same load that the engine sees going down the road or race track. All engines act a little different under different loads, turbo cars especially. Maybe your car will tolerate 17 degrees on timing while accelerating a 3000 lb. drum, but out on the track it will only tolerate 15 degrees of timing because your car is heavier / harder to push than the 3000 lb. drum. On an inertia only dyno, that's a chance you take. With the electronic load control, you can mimic the same loads the engine will see when driving, and hopefully arrive at the best tune combination for your application.

-Say you have a stutter / stumble at light throttle, 2200 RPM. You can tell the dyno to hold the drum speed when the engine equals 2200 RPM. When you hit 2200, no matter what you do with the throttle, the brake will apply / release to keep the engine at 2200. That allows you to watch a laptop without crashing, have the hood open and wiggle things while the problem is occurring, etc... You can also do this based on wheel MPH. Same problem, a stumble at light throttle on the freeway. Tell the dyno to hold the wheel speed to 72 MPH, and away you go.

-Road test without actually needing a road. You can drive the car on the dyno more or less like you'd drive it on the road / track. Shift gears (violently if you want to), accel, decel, etc... No risk of crashing while road testing, tickets, other nimrods pulling out in front of you, etc... And you can watch a scan tool or data logger without worrying about keeping one eye on the road.

-You can steady state the car. IE; 3000 RPM, WOT, and the eddy brake will apply enough load so that engine can't increase RPM; while showing real time torque and horsepower. Leave your foot on the floor, and click the laptop to add a degree of timing. You can watch the power / torque respond to that in real time. You can do this at any RPM or any MPH. Great way to find MBT.

-RPM or MPH step tests, custom load tests, etc... Hold the engine at 2000 RPM for three seconds, then let it come up 500 RPM every 3 seconds. This can be MPH based as well. The software also allows for custom tests, which allow you to configure the dyno set up anyway you'd like. Maybe you'll be pulling a trailer and want to apply 20% of the eddy brake's capacity to the entire run to simulate that. Load changes over time, over RPM, over distance, etc... The only real limit is your imagination.

There's a whole host of things it does beyond power and torque. Power generation stuff is fun, but the electronic brake allows you to do some really neat things with the car.

If anyone from here wants to play with it, I'm in Garner, NC near the 40-42 interchange.

joshkinzey AT gmail DOT com is the best way to get ahold of me.

 

Thats some cool shit right there! How about some pics?

 

Here’s a video of my car on it:

 

Nice car! and who the hell installs a dyno in their garage!! very cool and awesome offer, if you were close enough to me I'd be taking you up on it for sure.

 

Thats sweet, if I was close by I would come make some runs and hang out. Would love to do some before and after pulls, hanging out in hot rod garages is the best.

 

Josh is a great guy and it's a blast hanging out in the underground garage! I never knew how much fun it could be making 212 HP and I found out the stock air box is not a restriction, the a 65mm TB is not worth anything over the stocker on a stock engine. But completely removing the belt was worth 8 HP (Alt. Water pump, smog pump, AC, electric fan. When ever my MEchanic finishes the turbo kit. I hope to go back. He only works on it a few hours a week so progress has been slow.

 

That's the same dyno I have, except mine is above ground. I've had mine since 08. It comes in handy because you can't properly tune a turbo car without a load cell.

 

An extremely generous offer. I will gladly take you up on this when I complete my turbo project. Street tuning is a tough job and hard to find just the right hills to maintain specific load points.

 

Nice, Went through there yesterday. Crazy man held up in a house on hwy 50, traffic all screwed up.

 

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My brother and I visited Josh’s dyno last Saturday. Two hour drive for us, but worth it for the experience. Josh is both laid back, and knowledgeable.

My brother, is planning to install a basic turbo setup on his K5 over the New Years holiday. We established a baseline number to work off of. It took a few runs, however. Because we discovered that the e brake was left on for the first three runs! Whoops! (Not Josh’s fault, as he never got in the driver’s seat.)

All of the NC and maybe VA guys should consider getting up with Josh. It’s good to hang with fellow gearheads and get to know them. Only we understand the level of insanity, and why we sink so much money, blood, sweat, and tears into these things.