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12-12-2013
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#1 |
 
Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,188
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Does your exhaust choke your engine?
I guess, check out the difference in top speed on a 415
This 1995 #Corvette ZR-1 415 CID LT5 was featured in the August 1998 Issue of Road & Track, that was John Lingenfelter’s yellow 1995 ZR-1 for the top speed shootout. Mario Andretti drove all of the cars at the Fort Stockton test track and Lingenfelter's yellow ZR-1 ran 201.5 MPH with full exhaust and 218.1 MPH on open headers. This 415 CID LT5 produced 686 HP and is normally aspirated. The 1995 Corvette ZR1 415 CID is owned by Norm Koerner
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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12-12-2013
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#2 |
 Join Date: Apr 2004
Location: Atlanta, GA
Posts: 2,168
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Re: Does your exhaust choke your engine?
Funny you should bring this up. When Marc dynoed my 91 this week as it was cold out the first run he had an exhaust tube on to run the gases outside even with negative pull on it. he said the numbers came lower than suspected by a fair amount, Next runs he opened the door much better results.
So in his words yes flow makes a difference. |
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12-12-2013
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#3 |
  
Join Date: Feb 2010
Location: Pendleton, IN
Posts: 3,906
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Re: Does your exhaust choke your engine?
I'm suspecting my Turq "Z" is a non issue for restriction.
 I'll let you know for sure once my hearing comes back to normal.
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1988 KOH Prototype EX5023 sold 1990 ZR-1 #444 Convertible 1990 ZR-1 Black #966 1991 ZR-1 Quazar Blue #296 1957 Duntov SS Project |
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12-12-2013
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#4 |
 
Join Date: Nov 2007
Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri
Posts: 6,491
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Re: Does your exhaust choke your engine?
Always an interesting topic!
I'm at 432 rwhp (read my signature for details) but still have the Magnaflow muffs with the 2.5" restriction (abrupt...restriction), and stock TB. Marc suggested a minor improvement to my porting, back when he was doing a spot of welding on my IH. I made that correction. Now, I;m itchin' to see how close those three tweaks get me to 450 rwhp, w/o going to cams or electric water pump (cams = 20 - 25, water pump = 10, TB maybe 5, 3" Dynamax 17228s maybe 3-4 more, the "510" mod = X? Getting close! There is just sooo much potential locked up in these LT5s. I mean it is getting common place to approach or exceed the same power level at the wheels with the LT5 as the contemporary Corvette motors are making at the flywheel, in spite of using stock cams and giving up 18 or so cubic inches displacement. Gotta wonder: What were they thinking???
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Good carz, good food, good friendz = the best of timez! 90 #1202 "FBI" top end ported & relieved Cam timing by "Pete the Greek" Sans secondaries Chip & dyno tuning by Haibeck Automotive SW headers, X-pipe, MF muffs Former Secretary, ZR-1 Net Registry Last edited by Paul Workman; 12-12-2013 at 03:57 PM. |
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12-12-2013
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#5 | |
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Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,706
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Re: Does your exhaust choke your engine?
Quote:
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[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 |
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12-12-2013
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#6 |
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Join Date: Apr 2004
Location: Atlanta, GA
Posts: 2,168
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Re: Does your exhaust choke your engine?
The reason I am going to Corsa no cats over flowmasters.
Marc said with the extra head work he did better flowing exhaust would make better use of it. Possible 20hp!! over cats and flowmasters.
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Steve 1990 Steel Blue/Black #2355 1990 Red/Red #1473 1991 Quasar /Black #118 Sold 1991 Turquoise/Black #766 Parted Out 1993 Yellow/White #179 Sold 1990 Black/Gray #1361 Headers/4:10s Sold |
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12-12-2013
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#7 |
Join Date: Jun 2005
Location: pittsburgh
Posts: 4,629
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Re: Does your exhaust choke your engine?
well I've got the stock system, so yes
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It's not the car, it's the people - Doug Johnson 90 r/r "KEYS ON" nick named "T.L.B" |
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12-12-2013
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#8 |
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Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,188
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Re: Does your exhaust choke your engine?
Ok apparently lingenfelter got busted by the Road and Track police; they had L98 cats on the car so it looked to comply with the rules, they got caught with a bypass switch that went to open headers. So R&T made them run it with the L98 in use at WOT. Busted!
The following week they ran the same car with high flow cats and still hit the 218!
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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12-13-2013
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#9 |
Join Date: Mar 2004
Location: Found Member
Posts: 4,341
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Re: Does your exhaust choke your engine?
The difference between a loser and a winner , can be the one that can tweek the rules better. Ask any true drag racer.
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Frank Urbo. NCM Lifetime member # 982 Registry Founding # 237 |
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12-13-2013
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#10 |
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Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,706
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Re: Does your exhaust choke your engine?
The ultimate Tweaker was Smokey Yunick.
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[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 |
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Linear Mode
