Speed Cars

DZRTRUN said:
There is the front 

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Is there anything sealing the radiator to the surrounding shroud? Anything to direct air upwards so it enters the radiator at a 90* angle?

tjZ06 said:
You can help me re-engineer my cooling system on mine!  I need to look into the better fans that aren't insane $ and some shroud mods, probably. 

Honestly, even in front when I had Clay's Z1 car it was an issue.  The front tires on these super-wide SxSs sit far enough forward, and out wide enough that they throw stuff (even dust) onto your own windshield. 

-TJ
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Do I have to? :biggrin:

 
tjZ06 said:
I think someone posted on the Speed forum, perhaps along w/ the SPAL part numbers to replace/upgrade them.

Yes?

-TJ
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Have any pictures of the inside of the shroud from the front?  It looks like it clamshells over the cooling package, but  the offset beauty cover on the back side, combined with what appears to be no sealing on the front makes me wonder if air is hitting the shroud on exit and just looping around to the front.

 
Rockwood said:
Have any pictures of the inside of the shroud from the front?  It looks like it clamshells over the cooling package, but  the offset beauty cover on the back side, combined with what appears to be no sealing on the front makes me wonder if air is hitting the shroud on exit and just looping around to the front.
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I'll try to get better pics this weekend, hopefully taking it out for some miles on Sat. 

-TJ

 

Anyone try plugging the roof vent? With a windshield, that area on the leading edge of the roof is pretty low pressure, and the bed area might be higher pressure, so it may be pulling air backwards through the radiator. 

 
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7 hours ago, Rockwood said:

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That sounds like what some have been saying. One of the reasons is due to the extreme heat coming in to the cab, backseats, from the radiator. Fans should be pulling air out and it seems like they can’t overcome the high pressure. Some have tried a rear window others are playing with higher cfm fans. I believe @RiverDave is experimenting with a scoop that sticks out further than the windshield? Saw a picture of that somewhere. 

 
CampfiresNbrews said:
That sounds like what some have been saying. One of the reasons is due to the extreme heat coming in to the cab, backseats, from the radiator. Fans should be pulling air out and it seems like they can’t overcome the high pressure. Some have tried a rear window others are playing with higher cfm fans. I believe @RiverDave is experimenting with a scoop that sticks out further than the windshield? Saw a picture of that somewhere.
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Not sure if that will help unless it's a Gonzo nose. The steeper windshield will cause flow separation much sooner than the RX7 pictured above.

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Or maybe up higher will help.

The schnoz on the Speed is definitely large enough for an auxiliary radiator, or even relocating the radiator. That, or moving the radiator up, might be the only solution. Will definitely be interesting to see what people come up with once the season starts up again.
 
So I did quite a bit of testing on my car when I first got it.

I enlarged the scoop on the roof and tried all kinds of shit.. bottom line with the windshield and the light bar that roof scoop does nothing.. it’s too far back.

The cab has a negative pressure zone in it and it’s drawing air literally backwards through the radiator.

There are multiple problems happening that would take forever to type it all out.

The solution is an oil cooler in the front (Morgan motorsports) and an enlarged roof scoop that goes out in front of the windshield.

This has been tested thoroughly and seems to hav solved the problem.

The lift kit for the radiator from Hollander also makes a ton of sense to me. The gap between the fans and the shroud causes the air to recirculate in there..

I believe between Morgan and Hollander upgrades all the issues are fixed.

RD
 
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I follow kingadam on instagram who used to post on this website few years back and seen this on his stories. He puts out some nice work out of his shop and thought this was interesting. Might solve some of the issues with the negative pressure.
 
If the scoops on the B pillar are function, they aren't going to help. They would need to be turned around, or us a NACA like duct to force air AT the radiator..

It's not likely the scoop on the roof will be very functional either. The light bar will push the air over it at speed.
 
Biggest issue with a roof scoop is the radiator is almost parallel to airflow coming down from the scoop unless you really intrude on the passenger space. I’m sure it’ll help at least cancel the negative airflow in the cab, but there won’t be any natural airflow. Probably more than sufficient to keep it somewhat cool given the size of the radiator relative to the vehicle and engine output though. Carry spare relays. :D
 
Rickym20 said:
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I follow kingadam on instagram who used to post on this website few years back and seen this on his stories. He puts out some nice work out of his shop and thought this was interesting. Might solve some of the issues with the negative pressure.
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Should note the airflow across the two seater and the four seater are vastly different.

That might work on the two, but I honestly don’t see it working on the four. The scoop has to reach out damn near over the light bar IMO
 
So my car is down at Morgan motorsports right now getting their oil cooler / roof scoop / eibach springs

With the oil cooler and the roof scoop the car will run normal temps even on hot days running the shit out of it..

It also adds four quarts of oil which helps considerably.

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