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Old 05-16-2023, 06:40 PM   #1
Badmojo
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Video: Rotofab ZL1 Intake IAT Testing on a Road Course

I did some testing of the Roto-Fab vs. stock airbox with a Green Filter. Stephen Fitzgerald Selden has been a proponent of the stock airbox for road course duty for a while. I swapped the Roto-Fab that was on the car and put the stocker back on. The PDR captures Ambient Air Temp and IAT, but doesn't get MAT. You can get all this data in Pi Toolbox with a little work.

Results:

  1. Stocker +10 HP on Average
  2. Roto-Fab +13 F hotter IAT Average
  3. Boost was .7 psi higher with the Roto-Fab, but power was lower due to air density and likely less timing
  4. Ambient temps were close +/-2 degrees on the testing days
  5. Verdict: keeping the stock intake on with the rain deflector removed from the grille
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Old 05-16-2023, 08:15 PM   #2
FirstTimeChevy23
 
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Can you help me understand what is the rain guard is in the Grille?

Also, where in NC are you located?
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Old 05-16-2023, 08:21 PM   #3
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Don't take those numbers seriously. Take it to the drag strip and change them, you'll have a different outcome where the Rotofab will shine especially on the big end in MPH
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Old 05-17-2023, 06:06 AM   #4
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Quote:
Originally Posted by laynlo15 View Post
Don't take those numbers seriously. Take it to the drag strip and change them, you'll have a different outcome where the Rotofab will shine especially on the big end in MPH
The guy performs a legitimate experiment with backed up data and you say don’t take those number seriously? The only thing I don’t take seriously is hood open dyno sessions with these so called aftermarket cold air intakes!
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Old 05-17-2023, 07:42 AM   #5
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Very interesting video!
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Old 05-17-2023, 07:58 AM   #6
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Nice. So someone like myself that just enjoys the car on the mountain roads, stay with the stock box.
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Old 05-17-2023, 10:41 AM   #7
Badmojo
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Quote:
Originally Posted by FirstTimeChevy23 View Post
Can you help me understand what is the rain guard is in the Grille?

Also, where in NC are you located?

The rain guard is a little baffle plate with three plastic clips holding it in place. One is directly behind the driver's head light and the other two clip to the radiator support.
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Old 05-20-2023, 07:28 PM   #8
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dang. $500 and 1.5 hours install wasted. The whine is a little louder though lol
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Old 05-20-2023, 10:57 PM   #9
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That’s a very interesting test. The data makes sense. I would guess the lower restriction of the Roto-Fab would be more beneficial for drag racing due the shorter run time. I do much more road course events than drag racing and may stick with the stock air box.
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