Go Back   EcoModder Forum > EcoModding > EcoModding Central
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 06-15-2009, 08:07 PM   #31 (permalink)
Master EcoModder
 
Big Dave's Avatar
 
Join Date: Jan 2008
Location: Steppes of Central Indiana
Posts: 1,319

The Red Baron - '00 Ford F-350 XLT
90 day: 27.99 mpg (US)

Impala Phase Zero - '96 Chevrolet Impala SS
90 day: 21.03 mpg (US)
Thanks: 0
Thanked 186 Times in 127 Posts
Also recommended for turbo safety is a pyrometer. Measures exhaust gas temperature.

__________________
2000 Ford F-350 SC 4x2 6 Speed Manual
4" Slam
3.08:1 gears and Gear Vendor Overdrive
Rubber Conveyor Belt Air Dam
  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 07-26-2009, 04:53 PM   #32 (permalink)
Master EcoModder
 
Join Date: Apr 2008
Location: Michigan
Posts: 261

Bio Deezler (sold) - '03 Volkswagen Jetta GLS TDI
90 day: 50.78 mpg (US)

The Beast. - '03 GMC Sierra 2500HD SLT
90 day: 12.86 mpg (US)
Thanks: 0
Thanked 36 Times in 22 Posts
Never posted pics from the small mirror that I threw on (same one everyone else was buying up on ebay). It's basically only useful for backing into spaces or parallel parking. With a re-adjustment it should view the next lane ok.





Forgot to snap pics during the tuft test, but was glad to see the mirror didn't appear to be introducing any major flow disruptions anywhere past 5 or 6 inches downstream.


Today I started on a more ambitious project: Rear diffuser.

Would I really cut up this beautiful rear bumper?







I guess so!




You can see how this version of the VW Jetta bumper valence would end up parachuting fairly badly. My crappy coroplast panel wouldn't stay put, so its time for something more serious.

The spare tire well under the trunk actually bends into an 18 degree angle (!). By my measurements, I'll cut it down to approx 10 degrees, and box out the diffuser properly. I know some would say its too steep... But we'll see what happens.

Not sure about fins. Probably not necessary, but they do look pretty sweet.

There's still time for adjustments to the design, so if anyone has some suggestions I am all ears. Will probably cut my abs sheet tomorrow:



Can't seem to keep these things off the roof though!
  Reply With Quote
Old 07-26-2009, 08:01 PM   #33 (permalink)
Moderate your Moderation.
 
Join Date: Nov 2008
Location: Troy, Pa.
Posts: 8,919

Pasta - '96 Volkswagen Passat TDi
90 day: 45.22 mpg (US)
Thanks: 1,369
Thanked 430 Times in 353 Posts
LOL - Improving aero under the car, so it doesn't quite screw it up as much on top of the car... nice.

I still think your car is one of the cleanest modded I've seen so far. Good work!
__________________
"ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"

  Reply With Quote
Old 07-29-2009, 07:28 PM   #34 (permalink)
Master EcoModder
 
Join Date: Apr 2008
Location: Michigan
Posts: 261

Bio Deezler (sold) - '03 Volkswagen Jetta GLS TDI
90 day: 50.78 mpg (US)

The Beast. - '03 GMC Sierra 2500HD SLT
90 day: 12.86 mpg (US)
Thanks: 0
Thanked 36 Times in 22 Posts
Thanks dood.

So, got the rough build done. I need to tweak it a bit more before I call it done, but it should be doing its thing functionally. Finished it in the dark, late last night. I think the side fins are upside down.... doh. Speaking of fins, would anyone advocate putting a few more in?





The airflow under the car could still tumble quite a bit around the rear axle, but is pretty smooth from the spare tire well back. I think next would be some larger sheet metal (for heat resistance) panels that cover the middle of the car and rear axle.
  Reply With Quote
Old 07-29-2009, 08:27 PM   #35 (permalink)
Moderate your Moderation.
 
Join Date: Nov 2008
Location: Troy, Pa.
Posts: 8,919

Pasta - '96 Volkswagen Passat TDi
90 day: 45.22 mpg (US)
Thanks: 1,369
Thanked 430 Times in 353 Posts
I wouldn't add any more fins to it, since you'd have to get them perfectly straight for them not to create more area for the force of wind to act upon.

I believe that those diffusers are made in molds created by 5 axis mills and vacuum forming machines.
__________________
"ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"

  Reply With Quote
Old 08-18-2009, 02:06 PM   #36 (permalink)
Master EcoModder
 
Join Date: Apr 2008
Location: Michigan
Posts: 261

Bio Deezler (sold) - '03 Volkswagen Jetta GLS TDI
90 day: 50.78 mpg (US)

The Beast. - '03 GMC Sierra 2500HD SLT
90 day: 12.86 mpg (US)
Thanks: 0
Thanked 36 Times in 22 Posts
So right after switching to pure biodiesel dispensed from a tank at home, my mileage dropped from ~49 to ~46 mpgs. I thought I had verified my fuel measurement upon fill-ups, but it looks like I was off. After taking a road trip this weekend and having to first top off with B20 from the pump, then fill up on B99 from a nearby Mobil station on my way home, things are looking up! Identical driving conditions that measured 46 mpg at home were back to 49 mpgs at the pump last week.

Best ever 52 mpg on a road trip this past weekend across Michigan and back. Cruising speeds anywhere from 65 to 80 mph, with plenty of hard acceleration and a couple high speed bursts. No hyper-miling, but some drafting (its so hard to resist with all the minivans running 80 mph around here). On the exact same trip last year, with better BTU content biodiesel, and driving more carefully (but no aeromods), I only got 49mpgs.

So, I'm pleased. Couple more tweaks coming, hopefully will have pics soon.
  Reply With Quote
Old 08-18-2009, 07:23 PM   #37 (permalink)
EcoModding Lurker
 
Join Date: May 2009
Location: Poland
Posts: 21

Sharon - '00 Fiat Punto ELX JTD
90 day: 42.76 mpg (US)
Thanks: 0
Thanked 3 Times in 1 Post
I love the way your Jetta looks. It's very stylish and yet aero improved - that's what I'd like to achieve with my Punto...

Is there any noticeable difference in stability with your diffuser?
  Reply With Quote
Old 08-20-2009, 10:26 AM   #38 (permalink)
Master EcoModder
 
Join Date: Apr 2008
Location: Michigan
Posts: 261

Bio Deezler (sold) - '03 Volkswagen Jetta GLS TDI
90 day: 50.78 mpg (US)

The Beast. - '03 GMC Sierra 2500HD SLT
90 day: 12.86 mpg (US)
Thanks: 0
Thanked 36 Times in 22 Posts
Yes, I actually have noticed some good benefit to vehicle stability with the aero mods I've done, especially the diffuser. I try not to drink from the placebo kool-aid, but this is more tangible.

I know its frowned upon to discuss on a fuel saving website, but I can discern the most benefit at high speeds (80mph +). At 100mph, the stock aero made the car quite light and a little scary. Now its butter smooth (and gets there noticeably faster!). Susceptibility to cross winds, semi blow-by and other disturbing aero effects are also reduced.

Couple more aero-mods coming, then I plan to do a few coast-down tests. Unfortunately I don't have a baseline, but the Cd is pretty well known for my vehicle.
  Reply With Quote
Old 08-20-2009, 08:29 PM   #39 (permalink)
Master EcoModder
 
Big Dave's Avatar
 
Join Date: Jan 2008
Location: Steppes of Central Indiana
Posts: 1,319

The Red Baron - '00 Ford F-350 XLT
90 day: 27.99 mpg (US)

Impala Phase Zero - '96 Chevrolet Impala SS
90 day: 21.03 mpg (US)
Thanks: 0
Thanked 186 Times in 127 Posts
Bad Deezler!

Two variables (improved aero and biodiesel) in play at once.

BTW, B100 has about 10% lower heating value than dino-diesel, so MPG is always lowerwith bio-diesel.

If you live in SE Michigan 80 MPH is minimum survival speed in a small car.
__________________
2000 Ford F-350 SC 4x2 6 Speed Manual
4" Slam
3.08:1 gears and Gear Vendor Overdrive
Rubber Conveyor Belt Air Dam
  Reply With Quote
Old 08-21-2009, 01:18 AM   #40 (permalink)
Master EcoModder
 
Join Date: Sep 2008
Location: Fort Worth, Texas
Posts: 356

Silver Turtle - '02 Ford Focus Zx3
90 day: 38.83 mpg (US)
Thanks: 4
Thanked 2 Times in 2 Posts
Isnt the jetta aero better than the golf?

However, wouldnt it be easier to aeromod the golf? (the kammback seems a lot easier to do than anything to a sedan... other than a rear decklid extension and thats about it i guess)

  Reply With Quote
Reply  Post New Thread


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Ben Nelson's Electro-Metro Build thread bennelson Fossil Fuel Free 1499 12-22-2019 08:24 PM
Daox's 2003 Matrix Build Thread Daox EcoModding Central 76 01-11-2016 02:47 PM
Build Thread: 1996 Ranger 2.3L 5spd 2WD XVTer EcoModding Central 18 05-27-2012 09:39 PM
Build Thread Key Postings Index Experiment. TestDrive Forum News & Feedback 7 02-15-2009 09:53 PM
The UnNamed Wagon's build thread - Let it begin! Work in Progress XFi EcoModding Central 38 08-01-2008 01:21 AM



Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2023, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com