Who has straight runs on exhaust - Ford Mustang Forum
 
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post #1 of 12 (permalink) Old 09-05-2013 Thread Starter
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Who has straight runs on exhaust

I just ordered the Borla long tubes and am trying to make final decision on how to map out the rest of the exhaust. My fabricators and Dan Maslic who was present for the discussion suggest removing the balance tube since 60 V6 engines and our firing sequence are more efficient and resonate better without the X or H balance section. As of now I may go straight back from the headers into a 12" and 18" Vibrant resonator on each side then to the over axle tubes and my current mufflers. The VTs may not work well like this so we will see. I am just curious if anyone else has done straight runs?

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post #2 of 12 (permalink) Old 09-05-2013
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I have not done straight runs, but have thought about it many times.

From the cats getting straight piping at the midpipe without the crossover, that's what your talking about right?

If so my exhaust guy said it could lose power. Maybe it was to hot out and he didn't wanna do the work though?

Strange... But id be interested in hearing how it sounds. What was the reasoning behind gaining power going to straight pipes. I thought x pipes are the most flow efficient?



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post #3 of 12 (permalink) Old 09-05-2013 Thread Starter
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I am catless, but yes eliminating the crossover in the midpipe. X pipes help with scavenging but with the headers it is already being taken care of is how I understand it? I did not think to ask if the same would apply without the long tubes, sorry. Thier take is that manufacturers always go for NVR reduction first then power which is why they use balance tubes. I will ask next time I see him unless someone else with more knowledge than I can comment here.
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post #4 of 12 (permalink) Old 09-05-2013
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Does it have more to do with the angle of the motor and the firing order?

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post #5 of 12 (permalink) Old 09-05-2013 Thread Starter
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Quote:
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Does it have more to do with the angle of the motor and the firing order?
Both from what I got out of what they were saying
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post #6 of 12 (permalink) Old 09-06-2013
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Not sure what engine angle has to do with it unless there is a common firing order the 60 degree v6's all have. I will say from messing with many a Buick the 6 cylinder has some strange noise attributes or harmonics that are hard to tame. Theres a reason whe they are called, "A Buzzing half dozen". Try calling Borla, does there system stay small or does it expand as it goes out? If I were building a NA car I would be running Borla or Kooks headers, an X pipe and 2.5" exhaust out the back, this is just based on things I have seen and experimented with over the years and may not be the best.

Example a buddy with a 89 5.0 and I had similar builds, the only real difference was he stayed 2.25" going into his mufflers where I went 2.5", my car was 1 mph faster, we swapped exhaust and his car picked up the mph and he went 12's for the first time, not talking 800 hp cars here, talking 275hp.

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post #7 of 12 (permalink) Old 09-06-2013
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This is how I hope my stang sounds..

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post #8 of 12 (permalink) Old 09-06-2013 Thread Starter
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Quote:
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Not sure what engine angle has to do with it unless there is a common firing order the 60 degree v6's all have. I will say from messing with many a Buick the 6 cylinder has some strange noise attributes or harmonics that are hard to tame. Theres a reason whe they are called, "A Buzzing half dozen". Try calling Borla, does there system stay small or does it expand as it goes out? If I were building a NA car I would be running Borla or Kooks headers, an X pipe and 2.5" exhaust out the back, this is just based on things I have seen and experimented with over the years and may not be the best.

Example a buddy with a 89 5.0 and I had similar builds, the only real difference was he stayed 2.25" going into his mufflers where I went 2.5", my car was 1 mph faster, we swapped exhaust and his car picked up the mph and he went 12's for the first time, not talking 800 hp cars here, talking 275hp.

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John - I believe that is it, 60 = even alternating firing 1-4-2-5-3-6? I can go with the 2.5" as there was no reason not to do so except better clearances/easier to work with.
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post #9 of 12 (permalink) Old 09-06-2013
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Quote:
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John - I believe that is it, 60 = even alternating firing 1-4-2-5-3-6? I can go with the 2.5" as there was no reason not to do so except better clearances/easier to work with.
Hey Chris,

I did some research on exhaust systems some time ago, just generic exhausts and how they work. The reasoning for the X-Pipe is to assist with scavenging as you already know. I'm not sure if your long tubes will be as effective in scavenging without them.

Lets go over basics and see if the logic applies here:

The idea is that the X Pipe connects the two sides, we got that. The firing order alternates sides of the V (1, 4, 2, 5, 3, 6). So #1 fires, sends the pulse of gas out at a given velocity. After the gas pulse there is a vacuum created in the exhaust from the now lack of gas as it passes, this vacuum pulls the exhaust gasses out of the #4 cylinder by expanding the vacuum to the other side of the V as well through the X or H pipe. Then the pulse from #4 passes through and creates the vacuum from #2 on the opposide side via the X or H pipe.

So the reasoning here would be that your free flowing exhaust would still have scavenging. Logic would dictate that it would have to happen at a greater interval then, since each side of the V would now be separate. The pulses from #1 would have to create a vacuum and pull on exhaust from #2. The question is whether or not the timing between the intervals would be ideal for scavenging.

Also your exhaust is going to be loud as ****... When you get tired of your ears bleeding I'll take those Borlas off your hands for you : )

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my X pipe is kinda fake. id doesn't have a legit cross over. I have my stock manifolds then my resonators. Then I have E-cutouts, which are open 90% of the time. It dumps my exhaust right under the driver and passenger seat. If I have them closed, it hits the X pipe and then goes over axle into GT500 axlebacks.

I feel in the but dyno my car feels quicker with the cutouts open.. go with the straight pipe, the resonators eliminate so much rasp is incredible.

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Quote:
Originally Posted by Kerrdogg View Post
Theres a reason why they are called, "A Buzzing half dozen".
Buzzin` half dozen I haven`t heard that term used since wayyy back "in the day" when I had a Dart with the MOPAR slant six. The thing sounded like a Singer sowing machine when it was running. The damn things ran forever though.

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I once had a buick gn that had an H cross over welded into the cat back after the down pipe. It actually gave it a really nice sound as if it where a dual exhaust from the headers back which is of course impossible on a single turbo gn.

I could be wrong, but I don't think that the cross over has to be built into the mid pipe. I see no reason why you couldn't just put an H cross over into the cat back after the resonators you are going to install.

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