02-20-2017 | #21 | |
Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,161
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Re: Tail pipe halfsies?
Quote:
Just thinking 'out loud'
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1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 |
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02-20-2017 | #22 | |
Join Date: Apr 2007
Location: Lake Bluff, IL
Posts: 2,081
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Re: Tail pipe halfsies?
Quote:
Never a problem to bring up an old thread. I think it is great to occasionally review some of the info we have gleaned from our ownership of ZR-1s over the years. As to where you position the resonator, I don't believe that it matters at all where in the system it is located; it attenuates the offending frequencies no mater where it is. In fact, the only items that are location sensitive are the catalytic converters, as they need to get very hot to function properly so they need to be as close as possible to the fire in the cylinders. The only other exhaust system component location discussion I have had has come up about cutouts. Marc and I have a little debate about where to locate cutouts on an exhaust system, with him favoring a straight shot right before the pipes bend in front of the tire carrier, thereby eliminating the spare and carrier. (The picture on his web page shows this location). I favor the Tony Davila approach of right in front of the rear mufflers, coming off at a right angle, to preserve the spare tire and carrier. (Pictures of mine in my albums section). I think we both agree that once the exhaust gets back to the mufflers, with cutouts open (even at 90 degrees) plus the mufflers flowing any remaining exhaust that doesn't go out the cutouts, there is little performance difference between the two locations. --Bob
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2016 Long Beach Red Z06 #10281 "POPS Z" 1995 Polo Green #409 "WARP TEN"--Haibeck 350/510 package, 4.10s, Hurst, Stock Exhaust with QTP Cutouts --Sold but still running strong 1993 Quasar Blue #161 "HIL KING" --Sold but still running strong, now with more than 120,000 miles 1967 Marlboro Maroon/Saddle Corvette Coupe 300 hp/4-spd --Sold a long time ago ZR-1 Net Registry Founding Member #95 NCM Lifetime Member Favorite Quote--Attributed to Mickey Thompson: "Too Much Horsepower is Almost Enough" |
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02-20-2017 | #23 |
Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,161
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Re: Tail pipe halfsies?
So Bob,
on your old 95.. you had Stock exhaust with cutouts.. By that I assume not headers correct?
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1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 |
02-21-2017 | #24 |
Join Date: Apr 2007
Location: Lake Bluff, IL
Posts: 2,081
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Re: Tail pipe halfsies?
No Jeff, I had SW headers and no cats after Marc did the 510 package. But a stock "Cat Back" exhaust that I then had Marc modify to have the cutouts in front of the mufflers. You can see it pretty well on some of the pics in my albums section. I still have the original cast iron manifolds and cats though.--Bob
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2016 Long Beach Red Z06 #10281 "POPS Z" 1995 Polo Green #409 "WARP TEN"--Haibeck 350/510 package, 4.10s, Hurst, Stock Exhaust with QTP Cutouts --Sold but still running strong 1993 Quasar Blue #161 "HIL KING" --Sold but still running strong, now with more than 120,000 miles 1967 Marlboro Maroon/Saddle Corvette Coupe 300 hp/4-spd --Sold a long time ago ZR-1 Net Registry Founding Member #95 NCM Lifetime Member Favorite Quote--Attributed to Mickey Thompson: "Too Much Horsepower is Almost Enough" |
02-21-2017 | #25 |
Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,161
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Re: Tail pipe halfsies?
One more for you Bob
you had Corsa and you had the Headers/OEM setup.. which did you like more and why?
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1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 |
02-22-2017 | #26 | |
Join Date: Apr 2007
Location: Lake Bluff, IL
Posts: 2,081
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Re: Tail pipe halfsies?
Quote:
Over the years I tested about six different aftermarket exhausts and based on sound, lack of resonance and performance I went with Corsa for most of those years right up until I went back to the stock cat back exhaust with cutouts. On the 93 we had headers with cats mostly plus the Corsa, and on the 95 headers and no cats with Corsa and Stock. My conclusion is that with a high flow aftermarket exhaust system, the catalytic converters soften the sound and make it a more pleasant driving experience. I always said it seemed to be about a 20% improvement in the sound, whatever that means . I believe they only cost about 2-4 HP and do make the exhaust smell better and help the environment. With no cats there was definitely a noticeable smell on startup, kind of like we used to get in the 60s and 70s. But not so bad that I wanted to return to having cats in the system on the 95. But it was quite loud with the Headers, no cats and the Corsa, an issue resolved with the stock systems and cutouts. When I was younger I think I liked the Corsa with cats the best, but as I ease into old age, I really liked the stock system with cutouts. Quiet when I wanted it (but still a decent sound), a nice rumble with the cutouts partly open, and a straight thru exhaust with them fully open for racing and scaring dogs and small children. But as they say, your mileage may vary.--Bob
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2016 Long Beach Red Z06 #10281 "POPS Z" 1995 Polo Green #409 "WARP TEN"--Haibeck 350/510 package, 4.10s, Hurst, Stock Exhaust with QTP Cutouts --Sold but still running strong 1993 Quasar Blue #161 "HIL KING" --Sold but still running strong, now with more than 120,000 miles 1967 Marlboro Maroon/Saddle Corvette Coupe 300 hp/4-spd --Sold a long time ago ZR-1 Net Registry Founding Member #95 NCM Lifetime Member Favorite Quote--Attributed to Mickey Thompson: "Too Much Horsepower is Almost Enough" Last edited by WARP TEN; 02-22-2017 at 10:53 AM. |
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02-22-2017 | #27 |
Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,161
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Re: Tail pipe halfsies?
Cool, Thanks for your input..
I currently run Headers, Cats and Corss. my biggest complaint the the popping of the Corsa.. I have a different set of Cats and access to my stock exhaust, so was thinking upgrade the esonator which I think I have a 93 one in my attic along with the different cats and leaving my headers on.. All just thoughts at the moment..
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1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 |
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