My newest Absurdflow manifold: BEGI FM tubular replacement - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 03-31-2009, 12:50 PM   #21
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Quote:
Originally Posted by y8s View Post
Tims,

I still dont like the bellmouth.

Why can't you do a siamese pipe setup? Stick a 1-1/4 pipe on the side of a 2-1/4 pipe (i think that's the outlet) and then merge them into a 3 inch in the downpipe after a foot or so. you want ABSURD flow, I bet that tickles paul's prostate about 100 rpm sooner.
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Originally Posted by Braineack View Post
he's done it before:

Oh hell yeah on that pipe 2.25 for ~2", smooth Burns transitions to 2.5" for a little then another to 3" right before the WG blends. Yummy.

Bellmouths worked well for me, paul, artie, and the subie crowd tends to see better results with them than with the divorced WG setups. Plus there's still people giving BEGI grief over the flapper blocking the WG tube which even though it isn't true you still have to convince the buyer otherwise.

I don't know personally what would be better performance wise. Bellmouths are a little easier & cheaper than divorced...IF (big IF) there is a positive difference to divorced WG's, is the few extra hp worth the much extra $?

If there was demand I could do one. Actually that first bend would probably be easier. That downpipe I made for evan K does look sexy and it was surprisingly easy to do Maybe it's been too long to remember otherwise. Divorced WG on the "standard" Absurdflow manifold would be pretty easy to do...hmmm
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Old 03-31-2009, 12:50 PM   #22
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Thanks, and I hope Steph/BEGI doesn't have a problem. I doubt they will, I'm small fries. Or maybe she won't notice this thread. I'm just some guy with some cheapass Harbor Freight tools and a really nice welder (seriously if you guys saw what I use to make these manifolds you all would be doing it). I don't want to mess up my dad's business relationship with them either. I don't have anything to do with Shore Motorsports other than using their power to run my welder and doing "fab work" under their name after my real job if they need the help. I figure now that I have a house I can do this stuff on my time and start to seperate from Shore Motorsports and into the Absurdflow name.

BEGI makes nice stuff at great prices and are very eager to please. We are very lucky to have a vendor like that in our community.
No problem here. Structurally, it is not all that different than our manifold. Very artistic though.
Stephanie
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Old 03-31-2009, 12:55 PM   #23
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Originally Posted by TurboTim View Post
I'm taking these prices off BEGI's site. I don't know if they offer some package that I'm missing. This is for a '94:

94 stainless SGDP: $505
3" swaged end: $55
3" metal cat: $160 without flanges, $240 with flanges.

$650<$720 if you don't like flanges<$800 if you do
ONLY the MSM gets a CAT. So your price listing is slightly mis-leading.

And the 3" outlet is not always needed. All NB downpipes that end in 2.75" will bolt up to a 3" exhaust making the 3" outlet a moot point. The only time a 3" outlet would be needed is on a NA car. Then it locks you into a 3" exhaust becuse it will not bolt up to a stock size or aftermarket size exhaust.
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Old 03-31-2009, 01:02 PM   #24
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Quote:
Originally Posted by Stephanie Turner View Post
No problem here..... Very artistic though.
Stephanie
Thank you Steph, that means a lot to me.

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Originally Posted by Stephanie Turner View Post
ONLY the MSM gets a CAT. So your price listing is slightly mis-leading.

And the 3" outlet is not always needed. All NB downpipes that end in 2.75" will bolt up to a 3" exhaust making the 3" outlet a moot point. The only time a 3" outlet would be needed is on a NA car. Then it locks you into a 3" exhaust becuse it will not bolt up to a stock size or aftermarket size exhaust.
Stephanie
I do not want to be misleading. Thank you for the clarifiation.

Why does only the MSM get a cat? What if I want to purchase a 3" metal cat for my '94 1.8 to go with my stainless SGDP? Is the price not $240 for a 3" metal cat for a '94 1.8?
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Old 03-31-2009, 01:27 PM   #25
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Tim,

Awesome work!! It's good to see this thing coming along!
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Old 03-31-2009, 01:42 PM   #26
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Quote:
Originally Posted by TurboTim View Post
Oh hell yeah on that pipe 2.25 for ~2", smooth Burns transitions to 2.5" for a little then another to 3" right before the WG blends. Yummy.

Bellmouths worked well for me, paul, artie, and the subie crowd tends to see better results with them than with the divorced WG setups. Plus there's still people giving BEGI grief over the flapper blocking the WG tube which even though it isn't true you still have to convince the buyer otherwise.

I don't know personally what would be better performance wise. Bellmouths are a little easier & cheaper than divorced...IF (big IF) there is a positive difference to divorced WG's, is the few extra hp worth the much extra $?

If there was demand I could do one. Actually that first bend would probably be easier. That downpipe I made for evan K does look sexy and it was surprisingly easy to do Maybe it's been too long to remember otherwise. Divorced WG on the "standard" Absurdflow manifold would be pretty easy to do...hmmm
I'm thinking even simpler than that. just run the WG line 6 inches and tie it into the main pipe there. i forget how much space the WG needs to open though.

here is a not to scale view.
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My newest Absurdflow manifold: BEGI FM tubular replacement-absurdpipe.gif  
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Old 03-31-2009, 01:44 PM   #27
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wait. i've seen this somewhere.

on the left:
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Old 03-31-2009, 02:42 PM   #28
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That was about 14.5psi Tim. Heat soaked like a ************ as well.
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Old 03-31-2009, 03:03 PM   #29
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Tim, that's gorgeous. I'm eager to see how much better it flows vs. a cast BEGi piece. I wouldn't mind stepping up to a nicer exhaust manifold one of these days.
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Old 03-31-2009, 03:08 PM   #30
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Originally Posted by TurboTim View Post
That downpipe I made for evan K does look sexy
Befitting its owner.
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Old 04-01-2009, 03:00 PM   #31
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Why does only the MSM get a cat? What if I want to purchase a 3" metal cat for my '94 1.8 to go with my stainless SGDP? Is the price not $240 for a 3" metal cat for a '94 1.8?
Because the 1.6L, 1.8L, and 99-04's have the cat in the mid pipe. No reason to add a second one unless it fails emissions. It is only stock in the downpipe/header pipe on the MSM. The MSM then has a second CAT in the mid pipe. Strange, but that is Mazda....
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Old 04-01-2009, 03:37 PM   #32
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The point here Stephanie is if you want to get a better flowing DOWNPIPE AND CAT for your turbo Miata, Tim's setup comes out cheaper than buying your downpipe and a high flow cat from you. What's the point of going with a better flowing downpipe to force it throw a restrictive factory cat?

Tim's setup reaches and bolts up to 90-97 factory and aftermarket catbacks.
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Old 04-01-2009, 03:41 PM   #33
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Quote:
Originally Posted by y8s View Post
Tims,

I still dont like the bellmouth.

Why can't you do a siamese pipe setup? Stick a 1-1/4 pipe on the side of a 2-1/4 pipe (i think that's the outlet) and then merge them into a 3 inch in the downpipe after a foot or so. you want ABSURD flow, I bet that tickles paul's prostate about 100 rpm sooner.
Why?
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Old 04-01-2009, 04:59 PM   #34
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because your prostate is sensitive?

because that bellmouth will impede flow. you'll get turbulence coming out of the turbine.
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Old 04-01-2009, 05:57 PM   #35
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Oh yeah, I noticed that on my last 3 dynos sessions.
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Old 04-01-2009, 06:15 PM   #36
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Originally Posted by paul View Post
Oh yeah, I noticed that on my last 3 dynos sessions.

ok i know you get snippy when people question how awesome your setup is. i only said 100 rpm sooner spool, not 300 more horsepressure.
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Old 04-01-2009, 06:37 PM   #37
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im glad i have the shittest wastegate outlet design possible. if my exhaust flowed any better i wouldn't be able control all the creep. i still make 11psi on a 6psi wastegate.

i have a 2.25" outlet, no bellmouth.
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Old 04-01-2009, 06:46 PM   #38
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So with my 7psi actuator (that is most likely blowing open from the inside) I should make over 200ft-lbs of torque at 3050rpm instead of 3150 if I get a separated gas design? Sweet. Tim, get on it.
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Old 04-01-2009, 09:55 PM   #39
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So with my 7psi actuator (that is most likely blowing open from the inside) I should make over 200ft-lbs of torque at 3050rpm instead of 3150 if I get a separated gas design? Sweet. Tim, get on it.
you might. see when gases flow through a change in cross section, the flow velocity decreases and creates backpressure.

it's the same reason you dont want to (ahem scott) run a gutted cat instead of a straight pipe.
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Old 04-02-2009, 09:27 AM   #40
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Originally Posted by y8s View Post
I'm thinking even simpler than that. just run the WG line 6 inches and tie it into the main pipe there. i forget how much space the WG needs to open though.

here is a not to scale view.
Isn't this what the new BEGI standard pipe is? I guess just not 3"?

Last edited by TurboTim; 04-02-2009 at 09:49 AM.
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