Cute Wee Gem's Dyno build

[cute wee gem]

Shed up 

[rusty360]

She's no half arse job this one! Looks awesome!

[cute wee gem]

A few months back I bought the 4 items in this link to make it all work https://yourdyno.com/shop/ - I had to wait a couple of weeks for it but it was perfect timing as they had just released their own eddy current power supply. After checking out his youtube and forums it seemed like a good option for a reasonable price.

I then bolted some tie down points to the concrete, hooked the speed sensor up to the YourDyno controller and connected it to the laptop. I set it up for inertia mode with a moment of inertia number based on some weight calculations of the roller (educated guess for now). Strapped the trusty old NS250R to the roller and just eased into to things to get an idea of how it was all going.

I popped it in 3rd and did a run right out to 10,000 rpm or so. This was a pretty epic moment for me honestly.

Everything felt smooth and nothing looked out of place, so the next day I mucked about shimming bearings and coupling the retarder to the roller. Still in inertia mode, I strapped the paddock basher MX5 to the roller and did a test run in 3rd. Once again everything looked pretty good at this stage so I am very happy.

Here's a video.

 

[kpr]

Nice.  whats the yourdyno controller and software like to work with ?

[cute wee gem]

Super easy to set up and use so far. I've had a quick play with the retarder and that all seems to be working good, but I need to tweak the PID settings before I can do the proper MOI calibration.

Software itself is pretty simple to use also, and seems to have all the features I'd want. Never used a dyno before this, so can't really compare to anything else.

Can't do too much more fiddling until I can get my sparky to come wire up some extraction fans etc after the holidays. It gets pretty noxious in there lol.

[cute wee gem]

Did some dodgy sparky work and got the retarder working, as well as doing a 4th gear pull to see how everything is looking. So far so good.

 

[tortron]

Looks mint.

gona insulate the shed for late night pulls?

 

i assume you have lots of mates now

[rusty360]

The roller unit must have some serious bolts into the floor to stop it trying to flip backwards.

Looks awsome man, is it tricky to get car on the roller in the right place.

Are you going to do some tuning or is it just for a play.

Epic build 

[kws]

Awesome. What a cool project, and it looks like quite a pro setup for someone building it in their shed.

OS Dyno day at your place?

[cute wee gem]

Bought a couple 10.5kw, 30" fans 2nd hand, which should be enough to suck the nasties out. These are 3 phase so I really need Mr sparky to come and wire them in.

On 30/12/2020 at 08:41, tortron said:

gona insulate the shed for late night pulls?

You read my mind. Except more just to keep noise down a little for the neighbors in general and get rid of the tin can feeling inside.

I had some left over noise batts at home and some normal batts I scored from work for a box of beers, so I banged them in the walls and threw up some noiseline gib for now.

Built a false wall to enclose the fans as well.

I bought some sheets of 60mm polystyrene for the ceiling too, but will wait for mr sparky to do his bit first.

Also finishing off 2020 with a quick hit in the gem.

 

[cute wee gem]

On 30/12/2020 at 13:00, rusty360 said:

The roller unit must have some serious bolts into the floor to stop it trying to flip backwards.

Looks awsome man, is it tricky to get car on the roller in the right place.

Are you going to do some tuning or is it just for a play.

Epic build 

Thanks. I'm definitely going to do some tuning work. It is a little tricky to get the car on square but I might put some tape lines on the floor or something to help guide when reversing, other than that, you can tweak it with the straps

[tortron]

Better epoxy that floor too incase some english cars turn up

 

 

my vote for offtopic build of the year i think

[kseries.rookie]

On 30/12/2020 at 16:11, kws said:

OS Dyno day at your place?

+1

[cute wee gem]

11 hours ago, tortron said:

Better epoxy that floor too incase some english cars turn up

 

 

my vote for offtopic build of the year i think

Haha the bloody mx5 already wee'd all over the place.

OS dyno day could be a thing for sure.

[cute wee gem]

On 23/11/2020 at 20:27, cute wee gem said:

According to my rough math it should suck about 80-100kw + another 5kw (for the retarder rotors) to accelerate the roller over a 6 second ramp run. But not only am I not an engineer, I'm also not a mathematician lol

Interesting to note that with the gem on it, the brake was at 0% until the very last 1500rpm in that run where it ramps up to 20 to end the run, which took 7.5 seconds.

Seems to have more inertia than I expected.