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Old 04-09-2013, 10:58 PM   #1 (permalink)
MPG...what?
 
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Chevy Spark + rear diffuser

Wifey's new ride gets its first "real mod"

GP Fabrications unit, very nice piece.





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Old 04-10-2013, 06:15 AM   #2 (permalink)
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I'm jealous. I wish someone would make one of those for my Fit! I put a front undertray on, which helped mileage marginally (~1 MPG) but really, really, helped with stability at highway speeds and in windy conditions. But the back end is still open.
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Old 04-10-2013, 06:44 AM   #3 (permalink)
MPG...what?
 
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Its a universal piece. I had to fabricate/weld some aluminum brackets to mount the leading edge.
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Old 04-10-2013, 07:40 AM   #4 (permalink)
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Quote:
Originally Posted by malibuguy View Post
Its a universal piece. I had to fabricate/weld some aluminum brackets to mount the leading edge.
How did you gauge the angle? There are more and less effective angles, depending on vehicle. Can you adjust it?
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Old 04-10-2013, 08:03 AM   #5 (permalink)
MPG...what?
 
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I kinda just eyed it up. I put the leading edge just above what I think the main path of the airflow is going coming under the axle. I may have got it right. I may be off. I want to fill in the rest of the area once I get ahold of some aluminum sheet.
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Old 04-10-2013, 09:43 AM   #6 (permalink)
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Looks purty, but a diffuser needs clean flow to work properly. Since the underbody ahead of it is dirty, aerodynamically speaking, it's probably not doing much!

A belly pan would help. Next project??
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Old 04-10-2013, 11:25 AM   #7 (permalink)
MPG...what?
 
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Quote:
Originally Posted by MetroMPG View Post
Looks purty, but a diffuser needs clean flow to work properly. Since the underbody ahead of it is dirty, aerodynamically speaking, it's probably not doing much!

A belly pan would help. Next project??
indeed. i want to look into maybe getting the factory panels from an EV Spark, but most likely Ill make my own. This car looks really simple to flatten out.
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Old 04-10-2013, 01:29 PM   #8 (permalink)
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Question is, how it effects fuel economy. Looking cool can take a backseat.
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Old 04-10-2013, 03:20 PM   #9 (permalink)
MPG...what?
 
Join Date: Jan 2008
Location: Finksburg, MD
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Terkle - '97 Toyota Tercel Whitehawk
90 day: 40.91 mpg (US)

Bubble - '10 Toyota Yaris base
90 day: 41.88 mpg (US)

Deva - '13 Chevrolet Spark LS
90 day: 39.82 mpg (US)

Malibu5 - '82 Chevrolet Malibu Classic
90 day: 17.61 mpg (US)
Thanks: 1
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The tank with it is the best so far...but we will see
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Old 07-29-2017, 04:23 PM   #10 (permalink)
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Hey, Im not able to see pics at this late date of diffuser, can you send to me or repost, really interested for my 2013 Spark, thanks

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