Help; where's this post by Marc H??? - ZR-1 Net Registry Forums

Schrade · 05-13-2013

In an exhaust / header discussion thread, Marc H posted (or someone quoted him from elsewhere) , where the 'bottleneck' is in stock exhaust '90.

Anybody remember it?

I need to know if it's a factor in a potential header purchase @ BG...

Thanks here...

Kevin · 05-13-2013

resonator I beleive

Schrade · 05-13-2013

Thanks there Sir; now - is this a factor of any sort in header purchase?

efnfast · 05-13-2013

Check this from Marc's site
http://www.zr1specialist.com/HAT%20W...rly%20Cars.pdf

Schrade · 05-13-2013

Quote:

Originally Posted by efnfast

Check this from Marc's site
http://www.zr1specialist.com/HAT%20W...rly%20Cars.pdf

Thanks

Apparently it's not a factor; rather a separate consideration:

Quote:

Originally Posted by thethrillofspeed

Does it replace the factory resonator?

Quote:

Originally Posted by gbmidyear66

Headers just replace the factory exhaust manifolds and factory CATS

SW also sells a seperate exhaust system I believe - you could use factory, use the SW exhaust, or some other aftermarket exhaust system

Quote:

Originally Posted by Paul Workman

Quote:

Originally Posted by thethrillofspeed

Does it replace the factory resonator?

Only if you also opt for the X-pipe too. Which reminds me...

If I recall correctly, I believe at one time SW had two X-pipe options; one with a "cheese grater" liner (presumably to address resonance) and one w/o. Personally, I opted for the clean 3" X-pipe (no such liner). Might be worth asking about if also purchasing the X-pipe - IF it is even offered anymore. Just sayin.

p.

Schrade · 05-13-2013

HoLY cOw! yIKes!!! Finally hit that post # 58 after :54 minutes searching threads...

Quote:

Originally Posted by Meanmyz

Paul, I see that you have headers (without cats) and stock resonator and mufflers....

Anyone can chime in here:

With the '93 - '95 resonator and mufflers is it kind of an oxymoron to do a 500HP build with headers and hi flow cats and then be running through the stock resonator and mufflers?

From Marc H's information, it looks like the biggest restriction is at the inlet of the muffler. Also, in info on his site, it shows a general 5HP difference between 2nd generation stock and a freer flowing exhaust. I guess my question is...does that difference widen as you increase HP?

I am asking in assessing what I might do for mufflers.

Franke · 05-14-2013

Schrade,

When i replaced the exhaust on my Z with the Corsa system I noticed that the inlet to the resonator in the middle of the car was only 1 5/8 inches for each side which then expanded back out on the outlet. I felt that it could be somewhat restrictive coming off the large cat converter pipe. But I,m not an expert on it. Maybe chevy had their reasons.

Kevin · 05-14-2013

Quote:

Originally Posted by Franke

Schrade,

When i replaced the exhaust on my Z with the Corsa system I noticed that the inlet to the resonator in the middle of the car was only 1 5/8 inches for each side which then expanded back out on the outlet. I felt that it could be somewhat restrictive coming off the large cat converter pipe. But I,m not an expert on it. Maybe chevy had their reasons.

they didn't think it through

SteelBlueZR1 · 05-14-2013

I think they just cheaped out on the design and used existing restrictive resonators from lesser Corvettes.

XfireZ51 · 05-14-2013

That's why we're using Z06 exhaust control valves. No resonator but no drone either. Use an XPipe, and reduce weight.

05-13-2013	#1
Schrade Join Date: Dec 2012 Location: NC Posts: 1,786	Help; where's this post by Marc H??? In an exhaust / header discussion thread, Marc H posted (or someone quoted him from elsewhere) , where the 'bottleneck' is in stock exhaust '90. Anybody remember it? I need to know if it's a factor in a potential header purchase @ BG... Thanks here... __________________ I'm getting my snappics / threads removed blindly as fast as I can, to get in compliance with copyright / license TOS on the boards here (lots of FSM pages and other copyright / license violations on my part; sorry guys). And thanks to all the guys who didn't whine when I posted those FSM copyrighted / licensed stuff in my threads... ( :thumbsup: [b]and to think I complied with a mod's request to delete a pic of him in a Challenge Car in NCM Museum, so he wouldn't get in hot water)[/b] Thanks to several guys here for sending parts FREE; BearlyFlying, WeGone, Geezer, GoldCylon, and more there, TonyD, mike100, fletchusmc... 1990 #2794; 4L60e Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless, Power Effects 3" [IMG]https://lh5.googleusercontent.com/-GHpfzty7DVU/UQn-0Ru2xAI/AAAAAAAAA14/08mz1p4QLD4/s445/Screenshot-5.png[/IMG]

05-13-2013	#2
Kevin Join Date: Jun 2005 Location: pittsburgh Posts: 4,632	Re: Help; where's this post by Marc H??? resonator I beleive __________________ It's not the car, it's the people - Doug Johnson 90 r/r "KEYS ON" nick named "T.L.B"

05-13-2013	#3
Schrade Join Date: Dec 2012 Location: NC Posts: 1,786	Re: Help; where's this post by Marc H??? Thanks there Sir; now - is this a factor of any sort in header purchase? __________________ I'm getting my snappics / threads removed blindly as fast as I can, to get in compliance with copyright / license TOS on the boards here (lots of FSM pages and other copyright / license violations on my part; sorry guys). And thanks to all the guys who didn't whine when I posted those FSM copyrighted / licensed stuff in my threads... ( :thumbsup: [b]and to think I complied with a mod's request to delete a pic of him in a Challenge Car in NCM Museum, so he wouldn't get in hot water)[/b] Thanks to several guys here for sending parts FREE; BearlyFlying, WeGone, Geezer, GoldCylon, and more there, TonyD, mike100, fletchusmc... 1990 #2794; 4L60e Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless, Power Effects 3" [IMG]https://lh5.googleusercontent.com/-GHpfzty7DVU/UQn-0Ru2xAI/AAAAAAAAA14/08mz1p4QLD4/s445/Screenshot-5.png[/IMG]

05-13-2013	#4
efnfast Join Date: Nov 2011 Location: Dunbarton NH Posts: 7,486	Re: Help; where's this post by Marc H??? Check this from Marc's site http://www.zr1specialist.com/HAT%20W...rly%20Cars.pdf

05-14-2013	#7
Franke Join Date: May 2013 Location: Beaver, PA Posts: 516	Re: Help; where's this post by Marc H??? Schrade, When i replaced the exhaust on my Z with the Corsa system I noticed that the inlet to the resonator in the middle of the car was only 1 5/8 inches for each side which then expanded back out on the outlet. I felt that it could be somewhat restrictive coming off the large cat converter pipe. But I,m not an expert on it. Maybe chevy had their reasons.

05-14-2013	#9
SteelBlueZR1 Join Date: Aug 2011 Location: Evergreen, Co. Posts: 346	Re: Help; where's this post by Marc H??? I think they just cheaped out on the design and used existing restrictive resonators from lesser Corvettes. __________________ Bert Rankin 1991 ZR1 Steel Blue / Steel Blue #1029 Haibeck chip, slotted rotors, camber brace, C-beam plates, OBX exhaust, Nitto NT555 tires [SIGPIC][/SIGPIC]

05-14-2013	#10
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,708	Re: Help; where's this post by Marc H??? That's why we're using Z06 exhaust control valves. No resonator but no drone either. Use an XPipe, and reduce weight. __________________ [SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX