voe exhaust system - Pontiac GTO Forum
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post #1 of 11 (permalink) Old 03-16-2012, 11:17 AM Thread Starter
 
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voe exhaust system

I'm thinking about putting a voe exhaust system on my 1968 gto from waldon exhaust. Does anyone have any experience with these types of exhaust systems. Does it increase horsepower or is it even worth it. I would think the "cool" factor would be there. Also what is the widest rear tire can a 68 goat accommodate without tubbing it. Any input would be appreciated, Thank you,
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post #2 of 11 (permalink) Old 03-16-2012, 09:17 PM
 
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IMHO...the VOE system will work for a while then fail due to heat and soot. If you are lucky, it will fail shut. IT is expensive, use the $700 on something else.....my $.02...Eric



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post #3 of 11 (permalink) Old 03-17-2012, 08:13 PM
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You could do what I did... recreate the "spriit" of the VOE system using a pair of electric cutouts. I fabricated a control switch for them that looks like the VOE system control.

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post #4 of 11 (permalink) Old 03-19-2012, 10:10 AM
 
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You could do what I did... recreate the "spriit" of the VOE system using a pair of electric cutouts. I fabricated a control switch for them that looks like the VOE system control.

Bear
This is exactly what I thought about doing! Where was the original VOE located on the exhaust system?
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post #5 of 11 (permalink) Old 03-19-2012, 11:13 AM
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The original system consisted of special mufflers that had vacuum operated (hence the term "VOE") diaphragms on them that opened and closed ports in the muffler to alter the sound. I don't think the system ever completely bypassed the mufflers, it just provided a shortcut path so that "not as much" of the muffler got used. Strictly speaking, most states have laws on the books that prohibit using devices that can completely bypass the muffler.

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post #6 of 11 (permalink) Old 03-26-2012, 08:40 AM Thread Starter
 
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Thanks for replays, maybe I was jumping the gun a little bit.
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post #7 of 11 (permalink) Old 03-26-2012, 11:08 AM
 
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I worked with Tom Hand and owned Waldron's Exhaust when we re-introduced the VOE mufflers.

There IS a performance improvement when switching from quiet mode to open mode, but even in open mode the VOE mufflers do not flow as well as current "straight-through" performance mufflers. (e.g. Goerlich XLerator, Dynomax UltraFlo, Magnaflow Universal Performance, etc).

In our dyno tests, "open" mode test results showed approximately 10% higher peak torque readings and 5% to 7% higher peak HP readings than "quiet" mode. With the best "straight-through" performance mufflers, we realized an addition 5% increase (above "open" mode levels) in both torque and HP output.

In open mode, the VOE mufflers performed about the same as a typical "turbo" muffler design. Quiet mode test results were equal to the results achieved with a typical OEM muffler.

The mufflers and the internal valves are constructed of stainless steel and I am not aware of any units that have stopped working due to soot or heat. The vacuum actuator that controls the valve function is a serviceable part that can be quickly and easily replaced if it fails. If the vacuum actuator does fail, the muffler defaults to "quiet" mode.

I ran a personal durability test with a VOE muffler on my full-size GMC pick-up, including Michigan winters with typical salt exposure. I had no issues with the muffler functions. I probably had about 35k miles on that muffler when I sold the truck.

HTH.

1968 Pontiac GTO
1983 Pontiac Bonneville (G) wagon
2008 Pontiac G8 base

Last edited by jmt455; 03-26-2012 at 11:09 AM. Reason: clarification
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post #8 of 11 (permalink) Old 05-02-2012, 09:46 PM
 
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Also, the VOE was a rare option to have, but I always heard that it wasn't that "cool" of a feature on the original 70 GTO's that had them because they didn't really sound that much louder. The commercial pontiac came out with made them sound better than they really did when opened.

Nice to have, but not very functional.

It'd be interesting to compare an original set to the reproductions that are now out.
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post #9 of 11 (permalink) Old 07-28-2012, 10:15 PM
 
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Joseph, please check your private messages file. I sent your a few commons anout the new VOE mufflers we all had so much fun working on and rereleasing.
Thank you much,
Tom Hand
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post #10 of 11 (permalink) Old 07-31-2012, 08:27 AM
 
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VOEGTO, and blue to 70....I hope you don't think I was bad mouthing your product....NEVER MY INTENT. I don't know who BLUE is, but I have heard of Tom Hand and respect his opinions....Like I stated in my post, just my $.02........Eric



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