:confused: I will be installing Andy's X-pipe on my '99 vert early this week. Per Andy's suggestion, I will install it in front of the factory H-pipe and leave the H-pipe ON. This was suggested to help prevent movement or mis-alignment of the pipes and tips. No problem for me, but I still can't understand how I will lose the burble and popping caused by the H-pipe IF it is still the last link before the mufflers. OK...the X-pipe will equalize the pulses...but, won't they be screwed up again when they pass through the lousy H-pipe? I guess being a retired rocket scientist really has it's disadvantages!!!

Bless Andy's heart...that man sure has patience!!! Think I wore out his email discussing this with him. So...any of you out there do the install this way...X-pipe...H-pipe...then mufflers? Geez...all I need is a Y and a Z pipe and I will gain at least a couple hundred ponies, right? :jester

Thanks in advance for your kind (or not so kind) words on this. :cheers:


[Modified by mikecoffin1, 1:56 PM 3/3/2002]

 

This is the exact way I had mine installed and the tips are perfectly aligned. I still have just a little popping, but it sounds really good.
With just an H-pipe, each exhaust pulse travels down it's exhaust pipe until it comes to the H-pipe. At that point, some of the pulse will cross over into the other exhaust pipe because of differential pressure. As some of the pulse is crossing over, and therefore, taking a longer path, the result is basically non-synchronous pulses out the tail pipe, and one larger than the other.
With an X-pipe, both exhaust paths join. So now, when an exhaust pulse exits the X-pipe, a relatively equal amount of pulse is traveling down each exhaust pipe. When those equal pulses come to the H-pipe, they are passing by each side at the same time. As there is no differential pressure across the H-pipe, and therefore, basically no flow through it, it ceases to function as an equalizing device. The result is equally sized, synchronous exhaust pulses exiting the tailpipes.
Ed


[Modified by C5XTASY, 2:20 PM 3/3/2002]

 

Hey Ed...thanks for your info! Good to know that you have it installed that way. And I really appreciate the detailed explanation. Hmmm...you must be a scientist also, huh? Maybe a brain surgeon? :D

Years ago, I was teaching various subjects related to meteorology. I had to teach a short course on "writing, broadcasting, english, and grammar" to go along with all the scientific stuff. Well, that portion really stressed the do's and don't's for public presentations. Do you know that for about three years after that, I could never enjoy a presidential debate or any other type of "speaking" affair. Why? Because I was so involved in the dynamics of their presentation and all the "no-no's" they were doing, that I never really heard a word of the real subject matter! Funny how our mind works. LOL...well, I don't have to worry much anymore because my mind has almost come to a complete standstill now! Ah....."senior moments"... :D :D

Thanks again for your info. Looking forward to at least "reducing" the burbles and pops...mine is horrible. I'm always getting looks like "what are you doing driving that noisy junker"? Sounds like pure crapola! Maybe better things are to come this week...hope so!

 

Mike, I forgot to mention, I also have the A&A mod. You will like the tone and sound characteristics of the A&A with the X-pipe. It sounds really good. Glad to help with an explanation on the functioning of X and H pipes. I spent 32 years in the nuclear power industry, and am currently consulting in same. A thorough understanding and attention to detail is pretty important there, too. :)
Ed

 

This may be a stupid question, but with the X pipe do you still keep your cats?

Thanks

 

Yes the cats stay on, unless you get the off road X Pipe. It is wider at the front.

 

I tried to explain that to Mike but I guess it takes a Nuclear scientist to explain it it the right terms to a rocket scientist! I'm out of my league. :lol:

 

No No...Andy! You ARE in the right league! LOL... My plan all along was to install it exactly as you said. My only problem was being hung up on the little quarter size hole in the H pipe. Kept thinking how on earth the exhaust flow, whether smoothed by the X pipe or not, would not get screwed up again if it had to go through that hole. Since I never used an X pipe in rocket science, I didn't fully realize that the exhaust could flow straight back through the full pipe...I kept thinking it would be forced through that damn hole!!! :crazy:

Guess now you would never buy a rocket from me, huh? :jester

 

Ed...we will all sleep better tonight if we know that you took better care of nuclear plants better than I built rockets!!! :D :D Dang...43 years in the rocket business. Just takes some of us longer to figure things out, huh? doh..

Thanks for the extra info. Really looking forward to the great sound...


[Modified by mikecoffin1, 11:29 PM 3/3/2002]

 

No nuclear "scientist" here, just someone who's spent a lot of his life in nuclear power and has a deep love for these cars. :cheers:
Ed