EME-Hand built diffuser!!! - ZR-1 Net Registry Forums

oricale · 03-06-2017

Just finished a custom Evolution diffuser/custom side exhaust for Heliums ZR1....thoughts?

Sent from my SAMSUNG-SM-G935A using ZR-1 Net Registry mobile app

ssrszz4 · 03-06-2017

nice

Sent from my XT1585 using ZR-1 Net Registry mobile app

RussMcB · 03-06-2017

Pretty cool!

My gut feeling is the strakes should be straighter, in line with the car, because (I think), their purpose is to prevent the air from spilling in from the sides. At least, that's what wing fences are for.

on edit: I see the cardboard prototype's strake angles look more like what I've seen before.

Looks cool. Hard to tell how much it might help.

Do you have time booked at the wind tunnel? :-)

Arctic91 · 03-07-2017

Looks good!

Scott

billschroeder5842 · 03-07-2017

Wow- what great work! Well done.

Thomas ZR-1 · 03-08-2017

Quote:

Originally Posted by billschroeder5842

Wow- what great work! Well done.

Yes, good job...10 year ago I replaced my useless stock spare tyre with this, a little smaler diffuser because without a cover in the rear the uplift at higher vehicle speed on the highway makes the rear axle quite nervously.

billschroeder5842 · 03-08-2017

Quote:

Originally Posted by Thomas ZR-1

Thomas, what kind of exhaust system is that? Are you happy and how does it sound?

I have a MagnaFlow resonator on my 91 with stock mufflers. I'm mostly happy but would like a bit more.

Thomas ZR-1 · 03-08-2017

Hi Bill, the sound is perfect in my ears (some grandmas getting their little dogs blown away on the street!)....sounds like a race car! But inside the car it`s more silent than outside. I was afraid when I was standing outside the car during dyno-testing.

I welded whole system by myself...behind the Stainless Works headers, it`s all 3 inch size. There are two 100 cell cats followed from a muffler-dummy with a H-pipe inside. At the rear there are 2 mufflers with 3 inch inlet and 2 x 2.5 inch outlets. The 4 exhaust tips are from a truck supplier at eBay.com

GOLDCYLON · 03-08-2017

Quote:

Originally Posted by Thomas ZR-1

I replaced my useless stock spare tyre with this, a little smaler diffuser because without a cover in the rear the uplift at higher vehicle speed on the highway makes the rear axle quite nervously.

Actually Thomas that useless spare tire is used as a part of the safety calculation engineering wise if your rear-ended, Which is why GM added the Spare tire delete reinforcement bar if you don't have a spare

Here is a picture of the Spare Tire Delete Bar from GM in position on my son's 96 Grand Sport

lfalzarano · 03-08-2017

Quote:

Originally Posted by oricale

Just finished a custom Evolution diffuser/custom side exhaust for Heliums ZR1....thoughts?

Sent from my SAMSUNG-SM-G935A using ZR-1 Net Registry mobile app

That is a fantastic custom job!!!!! Outstanding.

Sent from my iPhone using ZR-1 Net Registry

03-06-2017	#1
oricale Join Date: Oct 2011 Location: STAFFORD VA, Posts: 576	EME-Hand built diffuser!!! Just finished a custom Evolution diffuser/custom side exhaust for Heliums ZR1....thoughts? Sent from my SAMSUNG-SM-G935A using ZR-1 Net Registry mobile app __________________ [B][I][COLOR=red]1990 ZR1[/COLOR][COLOR=black] [U]#00077 [COLOR=red]RED[/COLOR]/[COLOR=red]RED[/COLOR] (10Y022 PEP CAR) [/U][/COLOR][/I][/B][B][I][COLOR=red]1991 ZR1[/COLOR][COLOR=black] [U]#00517 ("Irene")[COLOR=red]WHITE[/COLOR]/[COLOR=red]RED-SOLD:cry:[/COLOR] [B][/B] [/U][/COLOR][/I][/B][B][I][COLOR=red]1992 ZR1[/COLOR][COLOR=black] [U]#00445("The Revenant")[COLOR=red][COLOR="Black"]BLACK [/COLOR][/COLOR]/[COLOR=red]RED(2016 T.O.D!) [/COLOR] [/U][/COLOR][/I][/B] [B][I][COLOR=red]2009 [COLOR=red]Z06!![COLOR=black]BLK/BLK rare Linen interior[/COLOR] 707HP!![/COLOR] [/COLOR][/I][/B] [B][I][COLOR=red]2006[/COLOR] BLK/BLK Z51 (Just SICK FAST!)SOLD)[/I][/B] [B][I]1996 BLK/BLK LT4 Grnsprt(sold...Twice!)[/I][/B] [B][I]1991 RED/REDL98(Fell off the shipping truck:([/I][/B] [B][I]1980 BLK/RED L82(Sold)[/I][/B] [B][I][B][I]1990[/I][/B] RED/BLK(sold.....In Japan)[/I][/B] [I][COLOR=black][B][I]2006[/I][/B][/COLOR][/I] [COLOR=red]Mustang GT[/COLOR] ([B][I]mach 1[/I][/B])[B](sold)[/B] [COLOR=black][B][I]1969[/I][/B][/COLOR] [COLOR=red]Mach[/COLOR] [B][I]1(sold in Japan)[/I][/B] [COLOR=black][B][I]1969[/I][/B][/COLOR] [COLOR=red]Mach[/COLOR] [B][I]1#2(sold)[/I][/B] [B][I]WAZOO Member...[/I][/B] [url]www.evolution-motorsport.com[/url] facebook/evolutionmotorsportengineering Your Local [url]www.Amsoil.com[/url] dealer/user.. Victory Loves Preparation Last edited by oricale; 03-06-2017 at 09:56 PM.

03-06-2017	#2
ssrszz4 Join Date: Jan 2017 Location: US Posts: 233	Re: EME-Hand built diffuser!!! nice Sent from my XT1585 using ZR-1 Net Registry mobile app

03-06-2017	#3
RussMcB Join Date: Jan 2015 Location: Marietta, GA USA Posts: 1,160	Re: EME-Hand built diffuser!!! Pretty cool! My gut feeling is the strakes should be straighter, in line with the car, because (I think), their purpose is to prevent the air from spilling in from the sides. At least, that's what wing fences are for. on edit: I see the cardboard prototype's strake angles look more like what I've seen before. Looks cool. Hard to tell how much it might help. Do you have time booked at the wind tunnel? :-) Last edited by RussMcB; 03-06-2017 at 11:13 PM.

03-07-2017	#4
Arctic91 Join Date: Nov 2007 Location: Sykesville, MD Posts: 377	Re: EME-Hand built diffuser!!! Looks good! Scott __________________ WAZOO Member '95 Callaway SNAT 450 Aerobody Coupe - Black/Black '92 Callaway SNAT 400 Convertible - Polo Green/Beige '91 ZR-1 #1231 - Arctic White/Saddle (SOLD) '90 ZR-1 #2547 - Turquoise Metallic/Black '89 Callaway Twin Turbo Aerobody Coupe #027 - Black/Black '85 Corvette 454 Coupe - White/Red

03-07-2017	#5
billschroeder5842 Join Date: Nov 2016 Location: Southlake, TX Posts: 584	Re: EME-Hand built diffuser!!! Wow- what great work! Well done. __________________ Bill Schroeder Texas Proud! 1991 Corvette ZR1 #1388 2015 Challenger Scat Pack Shaker

03-08-2017	#8
Thomas ZR-1 Join Date: Oct 2012 Location: Germany Posts: 227	Re: EME-Hand built diffuser!!! Hi Bill, the sound is perfect in my ears (some grandmas getting their little dogs blown away on the street!)....sounds like a race car! But inside the car it`s more silent than outside. I was afraid when I was standing outside the car during dyno-testing. I welded whole system by myself...behind the Stainless Works headers, it`s all 3 inch size. There are two 100 cell cats followed from a muffler-dummy with a H-pipe inside. At the rear there are 2 mufflers with 3 inch inlet and 2 x 2.5 inch outlets. The 4 exhaust tips are from a truck supplier at eBay.com __________________ Best thing in life is a ZR-1 ride