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Author Topic: Anti reversion chamber fab  (Read 25126 times)

mandrel-bends

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Anti reversion chamber fab
« on: April 26, 2010, 08:43:45 PM »

We are going to be installing these upstream of a x-pipe on a ~500 hp naturally aspirated car then dyno'ing with and without them. Math calc's were all based off the us patent on anti reversion chambers.



Here's the fab up:















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danz

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Re: Anti reversion chamber fab
« Reply #1 on: April 26, 2010, 08:47:59 PM »

wow u tig without gloves?  thats impressive.

my shit feels like its gonna light on fire when i use a tig bare hand.
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mandrel-bends

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Re: Anti reversion chamber fab
« Reply #2 on: April 26, 2010, 08:51:41 PM »

Steve tacks without gloves or a helmet because he's a lazy bastard and nobody is watching half the time. Nobody does any type of continuous welding without proper equipment here tho.
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turbob16hatch

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Re: Anti reversion chamber fab
« Reply #3 on: April 26, 2010, 09:10:10 PM »

very nice looking peice. I wear fabricator gloves solely when tig welding. I hate those damn "tig" gloves.
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weirtech

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Re: Anti reversion chamber fab
« Reply #4 on: April 26, 2010, 10:26:52 PM »

i'd think you'd see more gains by placing 4 individual ones closer to the head like on the hytech header.
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caged

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Re: Anti reversion chamber fab
« Reply #5 on: April 27, 2010, 02:30:22 AM »

Ill be interested in the results, what are you expecting to gain?
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Re: Anti reversion chamber fab
« Reply #6 on: April 27, 2010, 02:32:42 AM »

Ill be interested in the results, what are you expecting to gain?
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ifly87

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Re: Anti reversion chamber fab
« Reply #7 on: April 27, 2010, 03:30:51 AM »

Ill be interested in the results, what are you expecting to gain?

-$30 out of your checking account?
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mandrel-bends

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Re: Anti reversion chamber fab
« Reply #8 on: April 27, 2010, 11:55:25 AM »

We are trying to prevent reversion at the x-pipe. These cars are really sensitive at the exhaust cross-over.

Aaron, In this case, we would need 10 individual anti reversion chambers if we were to try to install it into the headers. It would be something to try - though right now we are focusing just on the exhaust.
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Minor Threat

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Re: Anti reversion chamber fab
« Reply #9 on: April 27, 2010, 12:06:41 PM »

M5?
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Re: Anti reversion chamber fab
« Reply #10 on: April 27, 2010, 12:23:12 PM »

yeah, it would take quite a bit more time to make that many.

in for results!
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mandrel-bends

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Re: Anti reversion chamber fab
« Reply #11 on: April 27, 2010, 12:39:03 PM »

Yes, M5.

Fabbin up the x-pipe.










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92CXyD

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Re: Anti reversion chamber fab
« Reply #12 on: April 27, 2010, 01:03:14 PM »

In for more picts, info, and results.

mandrel-bends

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Re: Anti reversion chamber fab
« Reply #13 on: April 27, 2010, 01:15:15 PM »







« Last Edit: April 27, 2010, 01:30:12 PM by mandrel-bends »
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mandrel-bends

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Re: Anti reversion chamber fab
« Reply #14 on: April 27, 2010, 02:00:41 PM »

Completed x-pipe with anti-reversion chambers. Will be installing on thursday. Dyno on friday.

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dvst8r

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Re: Anti reversion chamber fab
« Reply #15 on: April 27, 2010, 02:01:51 PM »

In terms of exhaust flow, are the reversion chambers pre or post x pipe?
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mandrel-bends

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Re: Anti reversion chamber fab
« Reply #16 on: April 27, 2010, 02:06:44 PM »

Currently PRE:

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Re: Anti reversion chamber fab
« Reply #17 on: April 27, 2010, 02:13:25 PM »

Iirc Dave (Passenger) Did an M5 exhaust not that long ago that made 40-50hp more on the dyno then the stock one. He will have to chime in on the exact numbers and specs though.
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speedjunky01

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Re: Anti reversion chamber fab
« Reply #18 on: April 27, 2010, 03:10:29 PM »

will you be keeping the cats?
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mandrel-bends

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Re: Anti reversion chamber fab
« Reply #19 on: April 27, 2010, 03:33:33 PM »

We were planning on removing the cat but it will likely be tested again with high-flow cats as well. Stock the car made 406 whp, there is a video of it on tunedbypsi.com in the dyno runs area. I would like to hear from dave on what he did.
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Passenger

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Re: Anti reversion chamber fab
« Reply #20 on: April 27, 2010, 04:16:44 PM »

I didn't do an X or H pipe, and I do usually try to avoid them, but I am pretty curious as to how this is going to work out for you, can't wait to see the results. You won't be able to put the cones in the header, the headers are a really neat piece of manufacturing, lots of fancy tube forming, but some of the reliefs on the tube near the head flange will make it a bit difficult to put the cones there.

This was the one I built:

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Re: Anti reversion chamber fab
« Reply #21 on: April 27, 2010, 04:35:20 PM »

An old Hot rod trick for placement of x-pipes is to draw a crayon line or paint a line along the pipes.

Then do a quick quarter mile run and then see where the crayon/paint stops melting and that is where you cut for x-/h-/balance tubes.

Saw that in Hot Rod Magazine in the late '90s they swear by it. :yes:

PhilStubbs

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Re: Anti reversion chamber fab
« Reply #22 on: April 27, 2010, 08:22:50 PM »

in for the results as i am about to make an N/A truck exhaust
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Joseph Davis

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Re: Anti reversion chamber fab
« Reply #23 on: April 27, 2010, 09:12:16 PM »

Are you planning on selling anti-reversion chamber kits for us lowrents, so we can DIY? 

mandrel-bends

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Re: Anti reversion chamber fab
« Reply #24 on: April 27, 2010, 09:14:07 PM »

Dave - I love those mufflers, I have them on the 550i. They sound sick.

That stock exhaust is different then mine. Ours has a dual muffler system on each side. What year was the M5?

The system you designed is basically what we are going to do just with some additional hardware. Was the car chipped when they dyno'd it? Intake?

My 550i was super sensitive to not running any type of cat or x-pipe, we actually lost a good amount of torque when we removed the cat. When we added high flow cats, and a similiar x-pipe, we gained 14 whp. When it ran just an x-pipe with no cat, we lost 26 foot pounds of torque and gained about 16 hp at the top of the power band.
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mandrel-bends

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Re: Anti reversion chamber fab
« Reply #25 on: April 27, 2010, 09:14:54 PM »

I dont see why not. Would need to figure out how to make them affordable though.

Are you planning on selling anti-reversion chamber kits for us lowrents, so we can DIY? 
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Joseph Davis

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Re: Anti reversion chamber fab
« Reply #26 on: April 27, 2010, 09:19:20 PM »

Lack of line production machinery/demand for in volume might make the price suck for us, eh?

It's a shitty world to live in, sometimes.

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Re: Anti reversion chamber fab
« Reply #27 on: April 27, 2010, 09:23:16 PM »

those cones are expensive. i priced some stuff from megs exhaust once cause i wanted to make an expansion chamber for my scooter. it was crazy. i just got a piece of tubing that was the length of the whole chamber, and the diameter of the thickest part and cut longitudinal pie cuts out of it to make the smaller ends. took an hour, but was a hell of a lot cheaper.
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Re: Anti reversion chamber fab
« Reply #28 on: April 28, 2010, 01:07:19 AM »

Dave - I love those mufflers, I have them on the 550i. They sound sick.

That stock exhaust is different then mine. Ours has a dual muffler system on each side. What year was the M5?

The system you designed is basically what we are going to do just with some additional hardware. Was the car chipped when they dyno'd it? Intake?

My 550i was super sensitive to not running any type of cat or x-pipe, we actually lost a good amount of torque when we removed the cat. When we added high flow cats, and a similiar x-pipe, we gained 14 whp. When it ran just an x-pipe with no cat, we lost 26 foot pounds of torque and gained about 16 hp at the top of the power band.

Adam, yes those magnaflow mufflers are awesome, I have used them on all sorts of cars, magnaflow really does make a solid product.

That car wasn't an M5, it was a M6, I think it is an '06 or '07? Not too sure, I think it is the same 5.0l V10. Does the 550i have the same engine as the M5 too?
The M6 was not chipped, nor do I believe it had any additional hardware. I know it was dyno tested before the exhaust, and I do think it was tested afterwards, but with some other modifications, I didn't do the testing myself, nor did I ever see the charts anyways.

I've found with modern engines equipped from the manufacturer with some sort of balance between the the banks often respond better with aftermarket exhaust that are likewise, up until the point of proper re tuning of the engine management.

I'd really like to see your results from the anti reversion chambers so far down the exhaust stream, I've never seen them placed like that, but I think they are close enough to the headers to still have a positive impact.
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mandrel-bends

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Re: Anti reversion chamber fab
« Reply #29 on: April 28, 2010, 07:45:06 PM »

I'll run some times on them when we do production for a few of these units and see where they sit. I think they are sub $50 parts though.

Lack of line production machinery/demand for in volume might make the price suck for us, eh?

It's a shitty world to live in, sometimes.
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