Big Ass Diffuser - Page 2

Gunkk · 05-08-2019, 12:09 AM

I for one am eager to see how well it performs vs. the upside down pickup truck bed.

viurniel · 05-08-2019, 11:03 AM

Yes, keep this updated with the performance changes vs the hole - and also consider modifying it aesthetically.

FNxR3DNECK · 05-08-2019, 11:56 AM

Man if yall think this looks crazy you should see some of the Unlimited Class Time Attack cars haha

Tim202 · 05-09-2019, 10:02 AM

I'm interested in how it performs as well. Would like to see the aero on the front end too. With that much rear down force I'd think it would understeer.

Start The Machine · 05-09-2019, 10:19 AM

I wouldn't mind having the entire under pan from front to rear without the beard trimmer. Something like ASC makes for the 5th gen.

Matos1LE · 05-09-2019, 01:13 PM

This topic has been beaten to death by the Spec Miata and other Miata racing crowd. The idea of the parachute effect was disproven by CFD. The bumper acts just like a pickup bed with the tailgate up. Air recirculates there and oncoming air flows over the recirculating bubble. The advantage of the diffuser is more for downforce than anything. Should be the similar for the Camaro as well.

Apex_Missing_Ape · 05-09-2019, 02:24 PM

This is comical, and awesome. I'm looking forward to seeing the numbers!

Rodan · 05-09-2019, 02:47 PM

Quote:

Originally Posted by Matos1LE

This topic has been beaten to death by the Spec Miata and other Miata racing crowd. The idea of the parachute effect was disproven by CFD.

Most of those discussions revolved around simply cutting the bumper, not adding a diffuser. And CFD is not absolute. I've only seen one thread where a guy did any coast down testing, and it wasn't all that difinitive, IIRC.

A proper diffuser will reduce drag and increase the effectiveness of a wing... the question is the quantification of the results.

nicktechla · 05-09-2019, 03:12 PM

If it makes you go faster.. awesome!

Matos1LE · 05-30-2019, 11:38 AM

Quote:

Originally Posted by Rodan

Most of those discussions revolved around simply cutting the bumper, not adding a diffuser. And CFD is not absolute. I've only seen one thread where a guy did any coast down testing, and it wasn't all that difinitive, IIRC.

A proper diffuser will reduce drag and increase the effectiveness of a wing... the question is the quantification of the results.

My comment was really directed at the notion of the bumper causing a parachute effect. I wasn't denying the advantages of cutting the bumper and adding a diffuser. No simulation is perfect, but CFD puts you in the ballpark, I'm aware of it's pros/cons.

Chris V · 05-30-2019, 11:55 AM

You can tell the guys who hard park vs. drive hard here.

Looks solid - are you able to test it independently of other changes to see the impact?

Planning on any flowviz or strings and cameras?

Vtor_ZL1 · 05-30-2019, 01:01 PM

if its as functional as it is ugly.. winner.

RSFR · 05-30-2019, 05:04 PM

Well it held on and we won our class at Road Atlanta, I'm going to say testing was successful.

Driver said the car felt better than ever, so I dunno. We'll leave it on unless we're presented with a reason not to.

carguy55 · 05-30-2019, 05:20 PM

Here's some info for making your own

https://grassrootsmotorsports.com/ar...ers-explained/

05-08-2019, 11:56 AM	#17
FNxR3DNECK Drives: 2017 SS 1LE Join Date: Mar 2016 Location: Monterey, CA Posts: 2,474	Man if yall think this looks crazy you should see some of the Unlimited Class Time Attack cars haha __________________ IG: @NC_M1SS1LE

05-09-2019, 10:19 AM	#19
Start The Machine Drives: 2016 M6 2.0T Join Date: Nov 2016 Location: Gig Harbor, WA Posts: 840	I wouldn't mind having the entire under pan from front to rear without the beard trimmer. Something like ASC makes for the 5th gen. __________________ RS Package, HD Cooling Package, Brembo 6 Piston Front Brakes, SRP Racing Pedals, Soler Performance Throttle Controller, Dyno Tuned by Trifecta, Velossa Tech Ram Air, Mishimoto Intake, aFe Air Filter, Mishimoto Charge Pipes, ZZP 67mm Throttle Body, Trifecta T40 Stage 2 Turbo, JacFab Recirculation Valve, PTP Turbo Blanket, ZZP Catted Downpipe, Mishimoto Pro Cat-Back Quad Tip Exhaust, Mishimoto Catch Cans, Mishimoto Coolant Reservoir Tank, GM SEMA Grill, Ikon Motorsports Front Fascia Extension, Ikon Motorsports 1LE Spoiler, American Authority ZL1 Side Skirts, AMPP Quad Tip Rear Valance

05-09-2019, 02:24 PM	#21
Apex_Missing_Ape Drives: 2018 2SS 1LE Join Date: Jul 2018 Location: Birmingham, AL Posts: 117	This is comical, and awesome. I'm looking forward to seeing the numbers! Last edited by Apex_Missing_Ape; 05-09-2019 at 03:01 PM.

05-09-2019, 03:12 PM	#23
nicktechla Drives: 2012 Porsche 911 Turbo S Join Date: Jan 2017 Location: Los Angeles, CA Posts: 1,776	If it makes you go faster.. awesome! __________________ IG: 2fast2nick -- Current -- 2012 Porsche Turbo S - PDK - Basalt Black Metallic -- Past -- 2017 Camaro ZL1 Coupe - Red Hot - A10, PDR - HRE P101 2015 Mustang GT PP - Whipple Supercharger

05-30-2019, 11:55 AM	#25
Chris V Drives: 2017 1SS 1LE Join Date: Aug 2017 Location: New Jersey Posts: 391	You can tell the guys who hard park vs. drive hard here. Looks solid - are you able to test it independently of other changes to see the impact? Planning on any flowviz or strings and cameras? __________________ www.facebook.com/1lap1le 2017 1SS 1LE - 663 whp/623 wtq Rotofab/Whipple/Kooks 2"/LT5 TB/LT4 Fueling/E85/MCS Coilovers/Ground Control/GOODAero/Apex Wheels/Race Louvers

05-08-2019, 12:09 AM	#15
Gunkk Thank you Al Oppenheiser! Drives: Red Hot A10 ZL1 Convertible Join Date: Jun 2017 Location: Sarasota, FL Posts: 4,978 View My Garage	I for one am eager to see how well it performs vs. the upside down pickup truck bed.

05-08-2019, 11:03 AM	#16
viurniel @viurniel Drives: 19 ZLE A10, 15 2SS, 90 300ZXTT Join Date: May 2016 Location: Miami Posts: 409	Yes, keep this updated with the performance changes vs the hole - and also consider modifying it aesthetically.

05-09-2019, 10:02 AM	#18
Tim202 Drives: 2018 ZL1 1LE Join Date: Dec 2016 Location: San Diego, CA Posts: 218	I'm interested in how it performs as well. Would like to see the aero on the front end too. With that much rear down force I'd think it would understeer.

05-09-2019, 01:13 PM	#20
Matos1LE Drives: SS 1LE Join Date: Oct 2017 Location: Miami Posts: 321	This topic has been beaten to death by the Spec Miata and other Miata racing crowd. The idea of the parachute effect was disproven by CFD. The bumper acts just like a pickup bed with the tailgate up. Air recirculates there and oncoming air flows over the recirculating bubble. The advantage of the diffuser is more for downforce than anything. Should be the similar for the Camaro as well.

05-30-2019, 01:01 PM	#26
Vtor_ZL1 Who Needs to KNOW? Drives: 18 ZLE Join Date: May 2018 Location: Left Side of the Moon Posts: 1,771	if its as functional as it is ugly.. winner. __________________ ing for grip. Are you in the NY/NJ/PA/CT region? Join us for autox fun at MetLife Stadium. HUGE lots, tons of runs. http://www.motorsportsne.com/

05-30-2019, 05:04 PM	#27
RSFR Drives: ZL1 Join Date: Jul 2017 Location: Texas Posts: 350	Well it held on and we won our class at Road Atlanta, I'm going to say testing was successful. Driver said the car felt better than ever, so I dunno. We'll leave it on unless we're presented with a reason not to.

05-30-2019, 05:20 PM	#28
carguy55 Drives: 2018 1SS 1LE Join Date: Feb 2017 Location: Austin, Texas Posts: 1,488 View My Garage	Here's some info for making your own https://grassrootsmotorsports.com/ar...ers-explained/

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