a review of zr-1 exhaust systemszr1specialist.com/hat web/presentations/a review of zr-1...
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A Review of ZR-1 Exhaust Systems
Marc Haibeck
Haibeck Automotive Technology
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Exhaust System Types
Sound
Performance
Headers
13-May-11
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Exhaust Systems That Are Found On C4 ZR-1’s• OE ’90 – ’92 2 ¾”
• OE ’93 – ’95 2 ¾”
• Borla: 2 ½”
Challenge 3”
• B&B: 3”
Version 1. Least restricted.
Version 2. With screens.
Version 3. With screens and plates.
Version 4. With screens, plates and outlet restrictor.
• Corsa 2 ½”
• Power Effects ?
• Flowmaster 2 ½”
• Stainless Works 3”
• Desert Development 3”
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Exhaust Tone
There are two basic methods to reduce loudness:
• Absorption
Has a low frequency rumble sound
Borla
B&B
Power Effects
Stainless Works
• Pressure wave cancellation
Has a high frequency sound
OE
Corsa
Flowmaster
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Exhaust Loudness
• The OE systems are quiet
• Medium Loud:
•Borla. Both systems.
•B&B Versions 2, 3, and 4.
•Flowmaster
•Corsa at less than 40% throttle
• Very Loud:
•B&B Version 1
•Power Effects Open
•Corsa at full throttle
•Desert Development
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Resonance•None:
•OE
•B&B version 4
•Corsa
• Medium:
•B&B versions 2 and 3
•Power Effects closed
•Borla. Both systems.
•Flowmaster
•Loud:
•Any B&B with an x-pipe
•Power Effects open
•Desert Development
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Power That Is Lost To The Exhaust SystemI believe that power increases constantly as backpressure is reduced.
• OE ’90 – ’92 - 20 hp
• OE ’93 – ’95 - 10 hp
• Borla: 2 ½” - 10 hp
Challenge 3” - 10 hp
• B&B:
Version 1. Least restricted. - 5 hp
Version 2. With screens. -10 hp
Version 3. With screens and plates. -10 hp
Version 4. With screens, plates and outlet restrictor. -15 hp
• Corsa - 5 hp
• Power Effects Open –5 hp Closed –10 hp
• Flowmaster -10 hp
• Stainless Works - 5 hp
• Desert Development Low loss
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Why Is The ’90 – ’92 OE System So Poor For Power?
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How Did They Improve The ’93-’95 OE System?
• The resonator is 2 5/8” ID
• Without the mufflers it’s a lot like straight pipes
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Borla Systems
• There is a 1 5/8” choke at the inlet to the resonator
• Excellent performance without the choke and resonator
• I think that the Challenge system is no better for power
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B&B Systems• Version 1 is the best for power and the loudest
• The resonator on version 2 and up is restrictive
• The muffler on version 3 has a blocking plate
• They fixed the resonance on version 4
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Why Does The Corsa Outperform The B&B With An X-Pipe?
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The Best Of Both Worlds
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HeadersThe OE manifolds are easy to improve upon for power
+ 25 hp