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Speed UTV - discussion

RiverDave

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This thread I’m hoping will end up being a section on here because there doesn’t seem to be any real world information on the cars yet. I will say in advance I’m not interested in any bashing or stupid comments etc..

If you don’t have any real world information or ideas there’s other threads for all the small talk.
 

RiverDave

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So I had ours picked up

This was it at the show..
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zhandfull

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The car is awesome. This may be a stupid question. Do you really need more than one?
 

RiverDave

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As with any Offroad car if you have a windshield it’s going to get a vortex effect behind the car. On rzr’s and can and it isn’t that huge of a deal because it is just dust coming in the back.. you can vent the windshield or do a host of other things to get rid of it.


With a rear radiator car it generally causes overheating problems.. yesterday we spent a half a day trying to figure that out..

First ride the car started getting hot.. and it happens crazy quick. We stopped and let it cool
Off..

(Still haven’t figured out the whip and rock light controls yet)




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RiverDave

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outboard_256

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How do you like the 2nd dash? I think you are the first one I have seen with it.
 

Dunerking

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Congrats on the Speed car! My neighbor got his on Sunday and is completely stoked! It will be their pre-runner as their son races SxS’s I believe in Score. Their car looks very similar to yours! Enjoy that thing! IMG_2657.jpeg IMG_2658.jpeg
 

LargeOrangeFont

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So we decided to put some spacers in the bottom of the windshield to create a gap between the hood and the bottom of it.. we made some 3/4 inch donuts and put them in there..

This is where my head was going. Or removing some frame material under the glass. That is a high pressure area, you’ll get a good amount of airflow.
 

LargeOrangeFont

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Can you get some pics of the front of the radiator and those inlets where we are trying to get the air to go?
 

outboard_256

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A gap on the bottom of the windshield should move a ton of air. Probably doesn't need that much 1/2"-1" would do wonders. With the windshield and window nets it's pretty much a sealed cockpit. So you will need something to let the air in. Curious if you have tried with no window nets, I bet that improves air flow.
 

HCP3

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This is where my head was going. Or removing some frame material under the glass. That is a high pressure area, you’ll get a good amount of airflow.

What is the purpose of a windshield if you are letting air through? Rocks/debris?
 
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RiverDave

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This is where my head was going. Or removing some frame material under the glass. That is a high pressure area, you’ll get a good amount of airflow.
I'll add to this thread as well Dave.

So no help with the scoop? Windshield spacers work?

What if you moved that scoop up closer to the windshield?

A very large scoop going all the way out to the front of the windshield above the light bar may work..

Either that or a large scoop
Towards the back of the roof with a tunnel That rams air right into the radiator? Maybe another option..

I want to try a few other non invasive things before I go swiss cheesing the roof permanently though.
 

rivermobster

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A lot of the guys I run with have 2 inch gaps at the bottom of the windshield.

🤷‍♂️
 

LargeOrangeFont

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What is the purpose of a windshield if you are letting air through? Rocks/debris?
It’s like being behind the windsheild in a boat, you get no air. I run about a 1 inch gap at the bottom. I’ll be doing that with my Speed car.

I like some air flow for comfort, the windshield assures I’m not getting pelted with rocks and not wind burned.

Also keep the windshield from fogging in the cold.
 

LargeOrangeFont

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The car is at my shop because we are working on it.. but I will later today.

RD

There is gonna be one minor change to make here and it will solve it. It might be something as simple as a deflector on the B pillar to get air back there.

Putting string all over the car and driving down the 95 would tell us a lot.

I bet the nets make it worse as well.
 

Ziggy

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So we spent a day yesterday experimenting and trying to see if we could solve this problem..

First up just a large scoop on the existing roof vent to increase flow.

I can tell you with the windshield on there’s didn’t seem to be any air coming through the stock vent at pretty much any speed..

With the additional large scoop on there it’s pretty much the same.. didn’t make any difference? Although at slow speed (5-10mph) it did seem to help with keeping the hot air from blowing forward.. at any real measurable speed though it’s useless.

RD

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Robbie should create some scoops for the sides at the C pillar to direct more airflow to the rad.
Maybe extend the top of roofscoop forward some so it stays in the airflow at speeds. To me it looks too far back from windscreen for air capture at all mph's.
 

LargeOrangeFont

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A very large scoop going all the way out to the front of the windshield above the light bar may work..

Either that or a large scoop
Towards the back of the roof with a tunnel That rams air right into the radiator? Maybe another option..

I want to try a few other non invasive things before I go swiss cheesing the roof permanently though.

I’d take the roof off first before cutting it up and just see what happens.

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Something like this flipped the other way to bring air in. Easy to try.
 

RiverDave

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There is gonna be one minor change to make here and it will solve it. It might be something as simple as a deflector on the B pillar to get air back there.

Putting string all over the car and driving down the 95 would tell us a lot.

I bet the nets make it worse as well.

That is in the plan. Putting yarn all over this thing with 360 cams inside and a drone chasing it.. lol
 

Rayson1971

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What does RG say about the overheating issue.? He might have or already done something to rectify the issue. Does he know?
 

Cole Trickle

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This is where my head was going. Or removing some frame material under the glass. That is a high pressure area, you’ll get a good amount of airflow.
This is what I was thinking as well.

Cut it out have someone 3D print a snap in piece with the same honey comb look as the top vent. Maybe even try and do something in the middle of you have the room.

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RiverDave

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A gap on the bottom of the windshield should move a ton of air. Probably doesn't need that much 1/2"-1" would do wonders. With the windshield and window nets it's pretty much a sealed cockpit. So you will need something to let the air in. Curious if you have tried with no window nets, I bet that improves air flow.

We haven’t tried no nets yet.. that’s on the agenda..

I can tell you we ran this thing with the front nets open.. zero air goes through them (as expected)

RD
 

RiverDave

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This is what I was thinking as well.

Cut it out have someone 3D print a snap in piece with the same honey comb look as the top vent. Maybe even try and do something in the middle of you have the room.

That top vent isn’t doing much with the windshield in place. View attachment 1280922

We gapped the bottom
Of the windshield 3/4 of an inch and it wasn’t enough. That is a lot more than vents would do
 

RiverDave

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Madigan left a space at the bottom of our window to help move air …

View attachment 1280926

Can ams are front radiator.. the amount of air you guys need is to just prevent dust recirculating from the back in..

This was my thought originally as well that we could just break the vortex behind the car. But because that vortex is back there we need a ton more for the radiator to breathe because it’s behind the back seats.
 

Enen

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For the overheating issue, have you considered a call to Ron Davis radiators? If a windshield is creating an overheating issue, I would think that the cooling system design is flawed and could benefit from an aftermarket solution? Maybe work with RDR to create an upgrade kit for these cars?
 

outboard_256

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speed forum has a thread on issues and fixes. They have your scoop and spacers as possible fixes for overheating. They also found a solution to your seat belt problem. If you unplug the wire under the seat it will think the seat belts are fastened so it won't go into limp mode.

 

LargeOrangeFont

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For the overheating issue, have you considered a call to Ron Davis radiators? If a windshield is creating an overheating issue, I would think that the cooling system design is flawed and could benefit from an aftermarket solution? Maybe work with RDR to create an upgrade kit for these cars?

That is possible, but the airflow would need to be increased first. There are no issues really sans windshield, so the system itself is sized appropriately.

The race cars have a Ron Davis system.
 

RiverDave

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speed forum has a thread on issues and fixes. They have your scoop and spacers as possible fixes for overheating. They also found a solution to your seat belt problem. If you unplug the wire under the seat it will think the seat belts are fastened so it won't go into limp mode.


I already did all that.. and beyond..

I think there’s more speed owners on here then that forum.. and I know we have a ton more resources just from the amount of people on here.

I intend to cure problems garner knowledge and start a speed section on rdp. To grow into SXS etc and start breaking more into Offroad segment.

RD
 

grumpy88

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Bigger fan on the radiator ? Possible shroud too ?
 

LargeOrangeFont

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This is what I was thinking as well.

Cut it out have someone 3D print a snap in piece with the same honey comb look as the top vent. Maybe even try and do something in the middle of you have the room.

That top vent isn’t doing much with the windshield in place. View attachment 1280922

My windshield already has a date with the portaband. 😁
 

25Elmn8r

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Instead of spacing out the windshield, I would look to add vents to the bottom frame like what I have on our KRX. Completely adjustable depending on the current weather. I can get better pics if you'd like.
Screenshot 2023-09-22 at 9.36.24 AM.png
 

LargeOrangeFont

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It is sized approximately but the way the fans are set in there with the shroud could be improved considerably.

The fans are below the shroud like an inch for some reason so the shroud maybe catching a lot of the hot air and recirculating it?

I did notice part of that. But couldn’t dig in obviously. Would be interesting to pull that off and see what is what. Running it with no shroud would also be a good test.

Do the fans shut off at speed? They probably should.
 

dirtslinger2

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On a side note.. we wanted to run the car so last night we went back to the shop and pulled the window off of it and took it out..

We didn’t have a chase car and as most know I pretty much only wear flip flops. This was my speed recovery kit. Lol. Including speed shoes..

View attachment 1280935
How did it do without the windshield? No issues with heat?
 

DLC

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@RiverDave

Take the windshield off and test the car to make sure that is the problem
 

DaveH

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@RiverDave

Take the windshield off and test the car to make sure that is the problem
i agree with this.......need a baseline of what temps the car sees without the windshield to see how bad the problem actually is. also need to make note of ambient temps as the car might be fine with the windshield as is in cooler weather. i would also vacuum the cooling system before doing anything to make sure there is no air in the system
 

RiverDave

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At speed. Generally speaking fans on cars become a restriction at speed and shut off.

With the way this is setup I think they are always going to be on.

We took the windshield off and it’s flowing quite a bit of air through the car now.. but large sections of the radiator intakes are blocked by the rear seats.. even the center section isn’t being force fed like it would on the front of a car.
 

RiverDave

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Wouldn't RG and his team tested this before release? Seems this is a fundamental issue

Not really.. because most don’t run windshields.

Weirdly on this car most at the sand show did have windshields. (Which is backwards from normal)

He did put out a video before saying this was a problem and it is for cold weather and speeds below 50mph only.

He has bigger fish to fry right now and will likely circle back to this at a later date. For the time being the solution is fake it off.
 

RiverDave

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i agree with this.......need a baseline of what temps the car sees without the windshield to see how bad the problem actually is. also need to make note of ambient temps as the car might be fine with the windshield as is in cooler weather. i would also vacuum the cooling system before doing anything to make sure there is no air in the system

We did take it off late last night. Ran 30-40 pretty hard miles.

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Most the time
The car is in the 190’ish range on temp.. when we were rubbing the shit out of it we got it to 199.

Previously with the window on it was running upper 190’s then would start to spike and get to 215’ish before we’d stop and let it idle to cool off.

I have to go back and check the exact temps
When it started overheating but I believe it was 215-225 at peak..

I can tell you the car won’t work with a windshield under big loads and high speeds..

If we take the nets off it might.. ?? Haven’t tried that yet.
 
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