1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

Airbox ideas. Help.

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Old Apr 9, 2019 | 03:05 PM
  #26  
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Originally Posted by mustanghammer
One of the cooler air box setups I saw was on Jesse Prather's EP RX7.
Do you have any photos of how this was done? Sounds a lot cleaner than many of the other setups.
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Old Apr 9, 2019 | 11:30 PM
  #27  
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No I don't, sorry.
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Old Apr 22, 2019 | 09:07 PM
  #28  
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Mostly final results. 92mm of velocity stack. Didn't seem to change my fueling at all. Temps stay at ambient. Downside is the intake noise is gone. Upside the intake noise is gone and the cockpit is quieter! I hear the exhaust now instead. I thought about insulating the box, not sure it's worth the cost.

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Old Apr 27, 2019 | 09:42 AM
  #29  
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From: St. Michael
Originally Posted by mikey D
Mostly final results. 92mm of velocity stack. Didn't seem to change my fueling at all. Temps stay at ambient. Downside is the intake noise is gone. Upside the intake noise is gone and the cockpit is quieter! I hear the exhaust now instead. I thought about insulating the box, not sure it's worth the cost.
Where did you get the ducting, filter and mounting flange?
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Old Apr 27, 2019 | 06:30 PM
  #30  
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What's your total runner length from the block? 92mm seems like a lot.
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Old Apr 27, 2019 | 09:45 PM
  #31  
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Originally Posted by Greg Cozier
Where did you get the ducting, filter and mounting flange?
Just a run of the mill k&n, and 5" duct from Pegasus racing.
Not sure what you mean by flange.
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Old Apr 27, 2019 | 09:58 PM
  #32  
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Originally Posted by chuyler1
What's your total runner length from the block? 92mm seems like a lot.
The additional length was desired. With 55mm stacks I'm hitting peak power past 8k rpms. I run the engine up to 9k and the power hasn't rolled over yet. If I can bump the peak down I'll have higher average power even if I loose a little up top.

Hopefully I can Dyno in the next couple of weeks and report back good news.
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Old Apr 28, 2019 | 01:54 AM
  #33  
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MikeyD looks good. Too bad i need a head light. I would love to do something similar. I noticed a power increase on the butt dyno after i installed my airbox. Curious to see what kind of actual numbers increase you get.
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Old Apr 28, 2019 | 08:50 AM
  #34  
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Holdfast, I think going in front of the radiator or down right behind the headlight in that same area would achieve the same. There's already even a hole in each location. You could also build a box there and use those 2 holes as the air inlets and have your filter in the box.
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Old Apr 28, 2019 | 01:13 PM
  #35  
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From: St. Michael
Originally Posted by Holdfast
MikeyD looks good. Too bad i need a head light. I would love to do something similar. I noticed a power increase on the butt dyno after i installed my airbox. Curious to see what kind of actual numbers increase you get.
You can fix the headlights in the up position and remove all the electric servo *****. Plenty of room and less weight.
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Old Apr 28, 2019 | 09:23 PM
  #36  
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Originally Posted by mikey D
Holdfast, I think going in front of the radiator or down right behind the headlight in that same area would achieve the same. There's already even a hole in each location. You could also build a box there and use those 2 holes as the air inlets and have your filter in the box.
Thats what i did. The "box" where i have the filter in is not closed off completely. The original plan was to get the snorkel from a gslse to supply air to the filter. I get air from the front and a small scoop i made in the side of radiator support. I was thinking of drilling 3inch hole in the radiator support. With the filter mounted infront of the radiator. But thought it would be too hot there.
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Old Apr 29, 2019 | 12:38 PM
  #37  
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Why would it be too hot in front of the radiator? I think the only issue is getting the filter wet with rain water hitting it directly, but if the filter is above the bumper line, I don't think it's an issue.
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Old Apr 29, 2019 | 03:02 PM
  #38  
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Originally Posted by chuyler1
Why would it be too hot in front of the radiator? I think the only issue is getting the filter wet with rain water hitting it directly, but if the filter is above the bumper line, I don't think it's an issue.
Hot intake temps was the original reason for installing this airbox in the first place. So i wanted to keep it away from any heat source. Your probably right about the water tho. i drove the car through some pretty heavy rain this winter. I would of sucked some water up for sure if i did have it in front of the radiator.
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Old Apr 29, 2019 | 08:48 PM
  #39  
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What your doing sounds good to me. I bet when stopped you do get warm air off the radiator but probably only then.
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Old May 30, 2019 | 03:58 AM
  #40  
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I put the filter in front of the radiator. did it mostly to clean up the engine bay and for a bigger filter. Haven't driven it yet so will see if my temps go up or down. I had just enough hose left over for it to work. Glad i bought too much. Tomorrow is going to be a sunny day in the 70's-80's. Curious to see what kinda temps i get.

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