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07-29-2011, 09:44 AM | #1 |
Top Scoob 019
Member#: 43630
Join Date: Sep 2003
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Vehicle:2004 GT40R-built 2.5 604 whp @1.8 BAR on VP109 |
Rear diffuser benfits..
So i have decided to modify my HKS kansai rear diffuser. To me the diffuser needs to extend all the way to the side of the bumper to provide greatest benefit, so i am going to extend the diffuser to cover these regions.
The questions i pose was there a reason that HKS decided not to extend to the bumper? Could this be detrimental in the benefit of the diffuser. I know that having a diffuser with no underbody aero (i am going to make a flat bottom out of carbon) may really not be beneficial to begin with.
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07-29-2011, 09:52 AM | #2 |
Scooby Specialist
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Join Date: Sep 2003
Location: Columbia, SC
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The air is probably so dirty there that it's of minimal benefit. (That being said.. what you're doing isn't going to hurt and I would probably have designed one to be like that in the first place.)
- Jon |
07-29-2011, 09:56 AM | #3 |
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cardboard looks good, just hit it with some black rattle-can....
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07-29-2011, 10:03 AM | #4 | ||
Top Scoob 019
Member#: 43630
Join Date: Sep 2003
Location: Down Under
Vehicle:2004 GT40R-built 2.5 604 whp @1.8 BAR on VP109 |
Quote:
But as youve also agreed that this is how it should have been designed in the first place.. Quote:
I'm taking it to my carbon guy tomorrow to integrate it with the diffuser.. |
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07-29-2011, 01:35 PM | #5 |
Former Vendor
Member#: 54918
Join Date: Feb 2004
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MAIC
Location: Gaithersburg, MD
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Well you're trying to channel the air down the center of the car where it has a smooth path. The edges of the bumper are blocked by the rear wheels but there is huge air coming off those rear tires. Just make sure if you extend it to that part that you're giving a path for the air to escape out the bumper and not end up acting like a parachute for the tire air.
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07-29-2011, 04:13 PM | #6 |
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Vehicle:2003 SOHC destroker |
check out the APR one, that goes out to the edges.
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07-29-2011, 04:30 PM | #7 |
Former Vendor
Member#: 54918
Join Date: Feb 2004
Chapter/Region:
MAIC
Location: Gaithersburg, MD
Vehicle:673 WHP Element Tuning Pro Comp Engine |
That's because it's supposed to look nice and finished on your street car. It's rare on any race car for it to extend past the wheels.
Now I'm not saying you can't do it. For instance if you were building a double diffuser then you can try and use the air off the wheels to create DF by having the air travel on top of the diffuser. |
07-29-2011, 06:09 PM | #8 | |
Top Scoob 019
Member#: 43630
Join Date: Sep 2003
Location: Down Under
Vehicle:2004 GT40R-built 2.5 604 whp @1.8 BAR on VP109 |
Quote:
If I did this would I have to seal the diffuser against the underside of the car to ensure that no air can get past?? |
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07-29-2011, 06:36 PM | #9 |
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or you can create own like Duncan@Race Dynamix,he create own Diffuser with full flat floor,for full benefit you will need go route of full flat floor like Ferrari Enzo
Enzo flat floor with diffuser And Duncan@Race dynamix Jura |
07-29-2011, 07:02 PM | #10 |
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Location: Montana
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I hope he's not actually using bc racing coilovers. ugh.
Sierra Sierra's new diffuser is pretty rad: http://www.motoiq.com/magazine_artic...11-update.aspx |
07-29-2011, 07:12 PM | #11 | |
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Quote:
And he win UK TA 2010 http://speedhunters.com/archive/2011...g-impreza.aspx Jura |
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07-29-2011, 08:24 PM | #12 |
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Vehicle:02 wrxbastardchild aw, MPS 2.34 breaking in |
Nothing like a near limitless budget with that SSE team. Thats sexy as hell straight off their old formula atlantic car modded to fit the evo. Crazy stuff, 1.2 million and climbing invested in that car.
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07-30-2011, 10:13 PM | #13 |
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07-30-2011, 10:40 PM | #14 |
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His are re valved with swift springs i thought. However the quality looks nice. I have never used them.
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07-30-2011, 11:18 PM | #15 | |
Former Vendor
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Quote:
We take pride in the fact that we've built a race car that uses parts anyone has access to at an affordable price. It has never been our goal to build the fastest racer with ab unlimited budget but to build a car that showcases the products we sell to our customers. |
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07-30-2011, 11:19 PM | #16 | |
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Vehicle:Some GDM V8, JDM Flat 4 X2 |
Quote:
2) I dont see a single car running at the top level in the World Time Attack in Australia using BC and this went off topic fast hahaha And SSE new aero looks crazy! As for rear aero going outside of the car. These guys seem to be pushing it to the very limit. I would assume that the FIA sporting regs mandate that its withen the body lines. The more surface area that you can put out to increase down force with as little drag as possible along with being able to maintain proper air flow over and into proper locations will be a benefit. Last edited by snowman4us; 07-30-2011 at 11:33 PM. |
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07-30-2011, 11:56 PM | #17 | |
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Quote:
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07-31-2011, 08:53 AM | #18 |
Top Scoob 019
Member#: 43630
Join Date: Sep 2003
Location: Down Under
Vehicle:2004 GT40R-built 2.5 604 whp @1.8 BAR on VP109 |
Okay well i was looking at putting a plate at the end of the diffuser that goes to the bottom of the underbody..
But i have a question... If the air is going past it will hit the top of the plate then be forced back down and then under/past the diffuser. Will this be a negative issue?? |
07-31-2011, 03:41 PM | #19 |
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not sure what you mean but anything that smooths the underside out is beneficial...
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07-31-2011, 08:39 PM | #20 | ||
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Member#: 255146
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Quote:
But most of people use here Exe-tc,AST or KW,Ohlins.. Jura Quote:
If your question is no,i wouldn't fit Diffuser... If you want this just for look,fit something which is less screw aero(front aero splitter and smoother front bumper without the edges) Jura |
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07-31-2011, 09:00 PM | #21 | ||
Top Scoob 019
Member#: 43630
Join Date: Sep 2003
Location: Down Under
Vehicle:2004 GT40R-built 2.5 604 whp @1.8 BAR on VP109 |
Quote:
I will get a pic up of what i want to do to explain it better.. Quote:
I im wanting to do the time attack next year in Sydney. i will go with a flat bottom panel at some stage but now im just trying to sort out the diffuser.. With the track work i do i will easily be hitting over 90 mph.. |
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07-31-2011, 09:12 PM | #22 | |
Scooby Newbie
Member#: 255146
Join Date: Aug 2010
Chapter/Region:
International
Location: Ashford,UK
Vehicle:2001 2002 WRX Wagon WR BLUE |
Quote:
Here is posted few and depends how you are skilled working with Carbon and can been done easily,about the flat under-body must be first and from this i would go for diffuser,because flat floor will be channeling air to diffuser. Jura |
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08-01-2011, 12:16 AM | #23 |
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Last edited by jamal; 08-01-2011 at 12:28 AM. |
08-01-2011, 12:53 AM | #24 |
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NESIC
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Vehicle:2005 STI Race Ready OBP/Orange |
If you go back to the Grassroot Motorsports UTC thread, TIC did win the Fastest Subaru Trophy with a 2:01.309 official timed and Element Tuning ran a 1:56.xxx unofficial timed and Phil got DQ for something I forgot.
The point I'm making is you can get a within reasonable priced true custom c/o to your specs for the non-sponsored, mere-mortal like the rest of us working class people and still able to be competitive without braking the bank. Also Phil have already recorded many track miles and testing on these c/o and provide support for the c/o is well worth the price. |
08-01-2011, 03:04 AM | #25 |
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there are plenty of actual good shocks that "mere-mortals" can afford- KW clubsport, AST 4100/4200, etc. And look at what people are dumping into engine and turbo setups- that car pictured above has a fancy block with cosworth internals, a dry sump, crazy carbon aero bits, but then has the cheapest and crappiest suspension and brakes in the world. I just don't get it.
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