Autocrossing & Roadracing Suspension Setup for Track Corvettes, Camber/Caster Adjustments, R-Compound Tires, Race Slicks, Tips on Driving Technique, Events, Results
Sponsored by:
Sponsored by:

Rear Diffuser

Thread Tools
 
Search this Thread
 
Old Feb 11, 2019 | 01:48 PM
  #1  
Josh Dockstader's Avatar
Josh Dockstader
Thread Starter
Advanced
 
Joined: Jul 2017
Posts: 66
Likes: 1
Default Rear Diffuser

Is there any companies out there that make an actual functional C6Z race rear diffuser? I have been looking online and done a little searching here but have not seen anything aside from the show car focused pieces.

Thanks!

Last edited by Josh Dockstader; Feb 11, 2019 at 01:48 PM.
Reply
Old Feb 11, 2019 | 01:54 PM
  #2  
SlothX311's Avatar
SlothX311
Pro
 
Joined: May 2014
Posts: 609
Likes: 103
From: Ohio
Default

Reply
Old Feb 11, 2019 | 05:40 PM
  #3  
STANG KILLA SS's Avatar
STANG KILLA SS
Safety Car
Liked
Loved
Community Favorite
Top Answer: 1
 
Joined: Feb 2016
Posts: 3,662
Likes: 386
From: Killeen Texas
Default

ive never come across one.
Reply
Old Feb 11, 2019 | 10:25 PM
  #4  
GO_BLUE_VETTES's Avatar
GO_BLUE_VETTES
Racer
15 Year Member
 
Joined: Sep 2006
Posts: 424
Likes: 25
From: Central VA
Default

AJ Hartman aero diffusor. I am installing on my C5. Aerodynamicist designed. Not bolt-on, requires some fab - but this is no show piece.

https://ajhartmanaero.com/modular-diffusor/
Reply
Old Feb 12, 2019 | 07:45 AM
  #5  
rbzo6's Avatar
rbzo6
Racer
15 Year Member
All Eyes On Me
Liked
 
Joined: Nov 2006
Posts: 268
Likes: 127
Default

I made one.
Reply
Old Feb 12, 2019 | 08:50 AM
  #6  
crimlwC6's Avatar
crimlwC6
Drifting
10 Year Member
 
Joined: Feb 2011
Posts: 1,255
Likes: 52
From: Arizona
Default

Originally Posted by GO_BLUE_VETTES
AJ Hartman aero diffusor. I am installing on my C5. Aerodynamicist designed. Not bolt-on, requires some fab - but this is no show piece.

https://ajhartmanaero.com/modular-diffusor/
I'm guessing you've done some measurements? Will you need canards or does the single piece cover the needed areas?
Reply
Old Feb 12, 2019 | 09:17 AM
  #7  
Josh Dockstader's Avatar
Josh Dockstader
Thread Starter
Advanced
 
Joined: Jul 2017
Posts: 66
Likes: 1
Default

Originally Posted by GO_BLUE_VETTES
AJ Hartman aero diffusor. I am installing on my C5. Aerodynamicist designed. Not bolt-on, requires some fab - but this is no show piece.

https://ajhartmanaero.com/modular-diffusor/
This is the route I was thinking I would have to go. How far have you gotten on install so far?
Reply
Old Feb 12, 2019 | 09:17 AM
  #8  
Josh Dockstader's Avatar
Josh Dockstader
Thread Starter
Advanced
 
Joined: Jul 2017
Posts: 66
Likes: 1
Default

Originally Posted by rbzo6
I made one.
Do you have any pictures straight on from the rear? Is it a home made diffuser or a purchased one?
Reply
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

 Michael S. Palmer
story-1

Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

 Joe Kucinski
story-2

150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

 Joe Kucinski
story-3

8 Coolest Corvette Pace Cars (and Replicas) of All Time

 Verdad Gallardo
story-4

Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

 Joe Kucinski
story-5

Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

 Verdad Gallardo
story-6

Top 10 Corvettes Coming to Mecum Indy 2026!

 Brett Foote
story-7

Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

 Michael S. Palmer
story-8

10 Revolutionary 'Corvette Firsts' Most People Don't Know

 Joe Kucinski
story-9

5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

 Michael S. Palmer
Old Feb 12, 2019 | 12:25 PM
  #9  
smitty2919's Avatar
smitty2919
Le Mans Master
Community Builder
Liked
Loved
Community Favorite
 
Joined: Jun 2016
Posts: 5,414
Likes: 3,957
From: Cincinnati, OH
Default

That AJ Hartman one is MASSIVE and I believed to be only inches off the ground to be very functional. I saw one of those on Paul Faessler's 60's road race car at PRI this year. It sits very low and extends pretty far out from the rear bumper.

If you are going 100% functional track car then it may be an option. But I would be hesitant on a dual purpose street/track car.
Reply
Old Feb 12, 2019 | 12:35 PM
  #10  
rbzo6's Avatar
rbzo6
Racer
15 Year Member
All Eyes On Me
Liked
 
Joined: Nov 2006
Posts: 268
Likes: 127
Default

Homemade. Constructed of 5052 .080 aluminum. Attaches to the factory diffuser. I run coil over shocks. A belly pan covers the rear up to where the exhaust pipes go together. Removed backup lights and replaces with SS screen to help trapped air escape.
Reply
Old Feb 12, 2019 | 02:07 PM
  #11  
Josh Dockstader's Avatar
Josh Dockstader
Thread Starter
Advanced
 
Joined: Jul 2017
Posts: 66
Likes: 1
Default

Originally Posted by rbzo6
Homemade. Constructed of 5052 .080 aluminum. Attaches to the factory diffuser. I run coil over shocks. A belly pan covers the rear up to where the exhaust pipes go together. Removed backup lights and replaces with SS screen to help trapped air escape.
That is very similar to what I had in mind for building my own if I went that route. Did you do any CAD for design or did you just manually cut everything?

Last edited by Josh Dockstader; Feb 12, 2019 at 02:14 PM.
Reply
Old Feb 12, 2019 | 07:35 PM
  #12  
rbzo6's Avatar
rbzo6
Racer
15 Year Member
All Eyes On Me
Liked
 
Joined: Nov 2006
Posts: 268
Likes: 127
Default

No CAD.
Reply
Old Feb 12, 2019 | 09:56 PM
  #13  
Josh Dockstader's Avatar
Josh Dockstader
Thread Starter
Advanced
 
Joined: Jul 2017
Posts: 66
Likes: 1
Default

Originally Posted by rbzo6
No CAD.
Looks really well done for no computer aid. Have you noticed any difference on track with it? Do you run front aero as well?
Reply
Old Feb 12, 2019 | 10:40 PM
  #14  
REVHARD's Avatar
REVHARD
Racer
15 Year Member
 
Joined: Oct 2006
Posts: 286
Likes: 18
From: Rochester MI
Default

Originally Posted by GO_BLUE_VETTES
AJ Hartman aero diffusor. I am installing on my C5. Aerodynamicist designed. Not bolt-on, requires some fab - but this is no show piece.

https://ajhartmanaero.com/modular-diffusor/
please post pics when done. I was looking at this for my C5 also.
Reply
Old Feb 13, 2019 | 09:08 PM
  #15  
c5racr1's Avatar
c5racr1
Melting Slicks
25 Year Member
Liked
Loved
Community Favorite
 
Joined: Feb 2000
Posts: 3,425
Likes: 567
From: new orleans
Default

Subscribed
Reply
Old Feb 14, 2019 | 12:02 PM
  #16  
smitty2919's Avatar
smitty2919
Le Mans Master
Community Builder
Liked
Loved
Community Favorite
 
Joined: Jun 2016
Posts: 5,414
Likes: 3,957
From: Cincinnati, OH
Default

You don't always need CAD. Cardboard or poster board, pencil and scissors can make plenty of cool stuff.
Reply
Old Feb 14, 2019 | 03:09 PM
  #17  
STANG KILLA SS's Avatar
STANG KILLA SS
Safety Car
Liked
Loved
Community Favorite
Top Answer: 1
 
Joined: Feb 2016
Posts: 3,662
Likes: 386
From: Killeen Texas
Default

agreed. as some one who uses CAD everyday at work. this is not needed for a sheetmetal diffuser.
tape measure, sharpie, straight edge, cardboard (if your a measure twice cut once type ) and maybe and angle finder if you want to get technical.
Reply

Get notified of new replies

To Rear Diffuser

Old Feb 14, 2019 | 04:11 PM
  #18  
Josh Dockstader's Avatar
Josh Dockstader
Thread Starter
Advanced
 
Joined: Jul 2017
Posts: 66
Likes: 1
Default

I also use CAD every day. If there was CAD models or .dxf files of the diffuser parts then it could be replicated very easily. That is why I asked. If I build one, I will do everything in SolidWorks and share the files with anyone who wants them.
Reply
Old Feb 15, 2019 | 09:11 AM
  #19  
smitty2919's Avatar
smitty2919
Le Mans Master
Community Builder
Liked
Loved
Community Favorite
 
Joined: Jun 2016
Posts: 5,414
Likes: 3,957
From: Cincinnati, OH
Default

It is surprising no one makes a "bolt on" rear diffuser for the C5/C6 with how many people race them.

Danny Popp can get you hooked up with a CAM style rear spoiler and or a road race wing. I'm not sure who fabricates this stuff for him as a "kit".

If I was to make one it would be easier to go the carboard/pencil/scissor route, get everything worked out THEN remove everything and replicate it in CAD. You can then add even bolt spacing etc etc. Would be quite easy. Export drawings or models in whatever file format a laser cutting machine needs to read it. Done.

Last edited by smitty2919; Feb 15, 2019 at 09:16 AM.
Reply
Old Feb 15, 2019 | 10:44 AM
  #20  
Josh Dockstader's Avatar
Josh Dockstader
Thread Starter
Advanced
 
Joined: Jul 2017
Posts: 66
Likes: 1
Default

Exactly smitty2919. I will see how much time I have this spring to work on one. Maybe rbz06 can post some under body photos to get an idea of how he made his. That would be a huge help for a starting point.

Last edited by Josh Dockstader; Feb 15, 2019 at 10:45 AM.
Reply



All times are GMT -4. The time now is 04:12 PM.

story-0
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

Slideshow: How to Protect A Convertible Top: 10 DOs & DON'Ts

By Michael S. Palmer | 2026-04-03 00:00:00


VIEW MORE
story-1
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

Slideshow: The 10 most explosive Corvettes ever built based on power-to-weight ratio.

By Joe Kucinski | 2026-05-20 07:23:03


VIEW MORE
story-2
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Slideshow: From C1 to C8 we compare every Corvette generation by the numbers.

By Joe Kucinski | 2026-05-12 16:54:12


VIEW MORE
story-3
8 Coolest Corvette Pace Cars (and Replicas) of All Time

Slideshow: Some Corvette pace cars became collectible legends, while others perfectly captured the look and attitude of their era.

By Verdad Gallardo | 2026-05-11 09:50:51


VIEW MORE
story-4
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)

Slideshow: Ranking the top 10 Corvette engines by torque output.

By Joe Kucinski | 2026-05-05 11:58:09


VIEW MORE
story-5
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!

Slideshow: A Corvette pace car nearly matching IndyCar speeds sounds exaggerated, until you look at the numbers.

By Verdad Gallardo | 2026-05-04 20:03:36


VIEW MORE
story-6
Top 10 Corvettes Coming to Mecum Indy 2026!

Among a rather large group of them.

By Brett Foote | 2026-05-04 13:56:44


VIEW MORE
story-7
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!

Slideshow: the top 10 things Corvette owners want in the C9 Corvette

By Michael S. Palmer | 2026-04-30 12:41:15


VIEW MORE
story-8
10 Revolutionary 'Corvette Firsts' Most People Don't Know

Slideshow: 10 Important Corvette 'firsts' that every fan should know.

By Joe Kucinski | 2026-04-29 17:02:16


VIEW MORE
story-9
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2

Slideshow: Should you buy a 2020-2026 Corvette or wait for 2027?

By Michael S. Palmer | 2026-04-22 10:08:58


VIEW MORE