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08-01-2002, 10:04 AM
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#1
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Registered User
Join Date: Apr 2002
Location: South Lyon, Mi.
Posts: 1,183
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How much will and exhaust cutout help my 1/4?
I am trying to find out how much time I can cut off of my 1/4 mile times with an exhaust cutout? my car is a 2002 Z28 m6 with a ram air hood and air box/K&N filter, stock exhaust and only some suspension upgrades, also how much will some lca's help my launch over the flimsy stock ones?
__________________
Attorney at Law
All toys sold to fund my law practice.
Former toys: Modded Corvette, 2002 Z28, 1994 Z28, 1994 Lightning, 1971 Cougar, 4X4's, more...
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08-01-2002, 02:07 PM
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#2
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Super Moderator
Join Date: Mar 1999
Location: Brunswick, Maine 04011
Posts: 10,029
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The stock exhaust is pretty good on the newer cars with light mods. A cutout may get you a tenth or two and maybe a mph or two.
In terms of launching, I would get some sticky tires before adding suspension pieces. Nitto or BFG drag radials work pretty well.
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'94 Black Z28, 383, 700R4
1/8 ET: 7.49
1/4 ET: 11.86
1/4 MPH: 112
http://www.downtime.cz28.com.index.html
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'94 Black Z28, 383, 700R4
1999 Champion Oxford Dragway
2002 Champion New England Dragway
11.86 at 112
http://www.downtime.com
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08-03-2002, 03:39 PM
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#3
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Registered User
Join Date: Sep 2001
Location: Zip Tie Island
Posts: 1,074
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If you are getting any wheel hop, I would install some lower control arms with polyurethane bushings.
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LALO aka ZipTie
95 Z28 A4 Daily Driver
95 TA M6 Rarely Driven
06 CBR 1000RR
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08-05-2002, 05:48 PM
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#4
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Member
Join Date: Jan 2002
Location: Bay Area, CA
Posts: 1,996
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I just put a cutout on mine. Each time I ran with it open, it gave me a consistant .1 sec off my 1/4 mile time, and about 2 mph.
-Jeff
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1998 NBM Z28, A4 2.73, Chrome 10-spoke SS rims, RK Sport ground effects, QTEC, Flowmaster, CAI, LS1 Motorsports Lid, K&N, MSD wires, custom painted interior.
**On Order:
SLP Ultra-Z Ram Air Hood. **
Best ET: 13.665 @ 103.25
Best 60': 2.114
Best reaction : 0.715
__________________
1998 Camaro Z28 - LS3 427, TSP ported L92 heads, L76 intake, Forged Compstar 4.1" crank, Forged Compstar rods, TSP 251/259 on 111 lsa .661 lift, Kooks 1 7/8 LTs, NW 90mm TB, 42# injectors, Custom Wiseco forged pistons, BMR K-member & A-arms, full suspension, 3.42 gears
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08-05-2002, 05:56 PM
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#5
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Registered User
Join Date: Jan 2001
Location: ajax ontario canada
Posts: 1,597
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I got 9 rwhp with the cutout and I run a consistant 1/10 better with it open at the track
__________________
1996Camaro,Solid Roller 383 ,AFR 210,Kook 1 7/8 LT headers,super vic converted to efi,digital7 ignition,12bolt rear with spool and 410 gears,th400,ati 5200 stall
10.62@128(motor) 1/8-6.68@102mph
http://videos.streetfire.net/video/S...J-1_133669.htm
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08-05-2002, 09:15 PM
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#6
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Registered User
Join Date: Nov 2001
Location: Edmond, OK USA
Posts: 605
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The cutout has been a mixed blessing for me - it shows some gains, but I seem to notice a decrease in torque. Anyone else notice this?
KASR
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94 Z28 Hardtop - (stock: 10.5:1, 5.7L, rated 275hp@5200, 325lb@2400, MFI - Current Rating: ???)
Throwing money at the hungry beast and moddin' away like a mad-man =) Holley CAI, !TB, !MAF, Flowmaster Catback, Monza Quad Tips, 3" cutout, 3.23 gears GU5/G80 perf. axle, QLC, 4L60-E, Spectre Breather and Filter, Autolite 103 plugs, wires, and filter, MSD 6A, Compucar n20 125, Comp TA BFG Drag Radials
MODS TO COME: Jet-Hot Hooker Long Tubes, Yank 3000 TC, cc305 cam, 1.6 rockers.
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08-06-2002, 12:15 PM
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#7
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Registered User
Join Date: Feb 2002
Location: Canal Winchester, OH
Posts: 363
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i have an slp loudmouth and noticed the decrease in torque.
it has more hp i imagine because it definetly seems to go faster from 30 + but its not as easy to break the tires loose as it was with the stock exhaust
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