My newest Absurdflow manifold: BEGI FM tubular replacement - Page 3 - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


DIY Turbo Discussion greddy on a 1.8? homebrew kit?

Reply
 
 
 
LinkBack Thread Tools
Old 04-02-2009, 09:33 AM   #41
Elite Member
Thread Starter
iTrader: (9)
 
TurboTim's Avatar
 
Join Date: Jun 2006
Location: Chesterfield, NJ
Posts: 6,485
Total Cats: 248
Default

Quote:
Originally Posted by y8s View Post
because your prostate is sensitive?

because that bellmouth will impede flow. you'll get turbulence coming out of the turbine.
Probably, but by how much? How much does a 2.25 or 2.5" impede flow over a 3"? Who knows. All I can do is try to dyno at the same time and on the same dyno as other setups and let the consumer choose.
TurboTim is offline   Reply With Quote
Old 04-02-2009, 09:48 AM   #42
Elite Member
Thread Starter
iTrader: (9)
 
TurboTim's Avatar
 
Join Date: Jun 2006
Location: Chesterfield, NJ
Posts: 6,485
Total Cats: 248
Default

Quote:
Originally Posted by paul View Post
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.
If you want it, you got it.
TurboTim is offline   Reply With Quote
Old 04-02-2009, 09:49 AM   #43
Elite Member
iTrader: (21)
 
paul's Avatar
 
Join Date: Jun 2006
Location: Point Pleasant, NJ
Posts: 2,957
Total Cats: 2
Default

Damn it I forgot my sarcasm meter
paul is offline   Reply With Quote
Old 04-02-2009, 11:15 AM   #44
y8s
2 Props,3 Dildos,& 1 Cat
iTrader: (8)
 
y8s's Avatar
 
Join Date: Jun 2005
Location: Fake Virginia
Posts: 19,038
Total Cats: 407
Default

shhh he was going to build it !!

tim, if you tell me the centerline radius of the pipes you can get and wall thickness and such, I can just CAD up my absurd pipe for paul's extra 100 rpm. perhaps there could be a little comparo at the dyno again. whee.
y8s is offline   Reply With Quote
Old 04-02-2009, 11:57 AM   #45
Former Vendor
 
Join Date: Jun 2006
Location: Bell Tuning & Performance
Posts: 1,338
Total Cats: -78
Default

Quote:
Originally Posted by TurboTim View Post
Isn't this what the new BEGI standard pipe is? I guess just not 3"?
The vent tube on the BEGI-S pipe is now 6.5" to 7" long.
Stephanie
Stephanie Turner is offline   Reply With Quote
Old 04-02-2009, 12:41 PM   #46
Elite Member
Thread Starter
iTrader: (9)
 
TurboTim's Avatar
 
Join Date: Jun 2006
Location: Chesterfield, NJ
Posts: 6,485
Total Cats: 248
Default

Quote:
Originally Posted by Stephanie Turner View Post
The vent tube on the BEGI-S pipe is now 6.5" to 7" long.
Stephanie
I'm sorry, I meant that your standard BEGI-S pipe is not 3" in diameter. Otherwise y8s drawing does look similar to your BEGI-S pipe and I guess FM's cast piece too.
TurboTim is offline   Reply With Quote
Old 04-02-2009, 12:47 PM   #47
Elite Member
Thread Starter
iTrader: (9)
 
TurboTim's Avatar
 
Join Date: Jun 2006
Location: Chesterfield, NJ
Posts: 6,485
Total Cats: 248
Default

Quote:
Originally Posted by y8s View Post
shhh he was going to build it !!

tim, if you tell me the centerline radius of the pipes you can get and wall thickness and such, I can just CAD up my absurd pipe for paul's extra 100 rpm. perhaps there could be a little comparo at the dyno again. whee.
thanks but I can CAD up my own Kinda hard to do the downpipe without having the entire underside of the car modeled too. I do use a modular Faro arm here at work...hmmmmmm...I don't think they'd let me borrow it for the night though. I don't think my salary can cover it.

I use 6" centerline 3" pipe, .060 wall. I use the usual pipes everyone else can get. 99% of the stuff is from Vibrant, other stuff is from Burns if vibrant/keystone is out of stock. You can get the centerline radii of the smaller pipes off vibrants website.

EDIT: If I were building a downpipe for my personal car, I'd be a bellmouth and no because it could be easier. When you take a 3" pipe and make it oval, it's about ~2.25" wide anyway and that 2.25" edge of the oval is centered over the turbine outlet. It's not like a 3" pipe is right over a 2.25 hole and there is no taper. So at least half of the turbine outlet is a smooth transition, the side against the oval edge of the bellmouth. The other half of the oval bellmouth is there for the rest of the exhaust and WG gasses to GTFO.

Last edited by TurboTim; 04-02-2009 at 12:57 PM.
TurboTim is offline   Reply With Quote
Old 04-02-2009, 02:49 PM   #48
y8s
2 Props,3 Dildos,& 1 Cat
iTrader: (8)
 
y8s's Avatar
 
Join Date: Jun 2005
Location: Fake Virginia
Posts: 19,038
Total Cats: 407
Default

ok simpler idea then.

can you weld a divider into the oval?
y8s is offline   Reply With Quote
Old 04-02-2009, 03:01 PM   #49
Elite Member
Thread Starter
iTrader: (9)
 
TurboTim's Avatar
 
Join Date: Jun 2006
Location: Chesterfield, NJ
Posts: 6,485
Total Cats: 248
Default

Quote:
Originally Posted by y8s View Post
ok simpler idea then.

can you weld a divider into the oval?
The owner of Jesel says he'd never use 80% of the things we make here.

So yeah, I can weld a divider into the oval. The customer is always right.

The downpipe at the dyno day will not have a divider.

IF I were to do a divider, it'd be a burns transition cut in half.
TurboTim is offline   Reply With Quote
Old 04-03-2009, 12:24 AM   #50
Junior Member
 
Join Date: Apr 2008
Posts: 350
Total Cats: -2
Default

Quote:
Originally Posted by TurboTim View Post
IF I were to do a divider, it'd be a burns transition cut in half.
Maybe just a section of 2.25" pipe or whatever protruding into the turbine discharge, but not going really deep into the bellmouth. Basically, something to keep the wasted charge from blasting sideways and disrupting the main flow at small wastegate openings. Like is cast into one version of the GT2560R.

Probably easier to do that welding it into the turbine housing, as long as you don't warp it, and if you have that available to work on. That's what was done on SCC's project Silvia Disco Potato.
SolarYellow510 is offline   Reply With Quote
Old 04-19-2009, 10:30 AM   #51
Elite Member
Thread Starter
iTrader: (9)
 
TurboTim's Avatar
 
Join Date: Jun 2006
Location: Chesterfield, NJ
Posts: 6,485
Total Cats: 248
Default

Update.

I spent yesterday removing the twins and making this other stuff fit (and I only forgot to tighten one thing! woohoo). I ported the wastegate on Paul's donor 2560; the spring pressure is 8psi using the garrett wastegate actuator. It spools quicker than the twins and the exhaust is louder. I am running the same tune so far as the twins, I assume that will probably change. But so far so good. I will aim for at 14-14.5psi at the dyno day to try to accurately compare JohnDoe's SGDP dyno plot posted earlier.

The orange discoloring on the manifold is the paint I didn't remove from the weld elbow.

Before:


After:


Close up:
TurboTim is offline   Reply With Quote
Old 05-04-2009, 01:38 PM   #52
Elite Member
Thread Starter
iTrader: (9)
 
TurboTim's Avatar
 
Join Date: Jun 2006
Location: Chesterfield, NJ
Posts: 6,485
Total Cats: 248
Default

I made 264rwhp @ 12psi on my first run, [email protected] 13psi on the 5th run with noticeable heat soak (notice spool difference). Peak boost was 14psi, dropping off around 5000rpm.

John Doe's was 14.5psi at some point. I am not sure if he was able to hold it to redline/hp peak. I sent him a PM to find out.

Big spool difference compared to the cast BEGI/SS SGDP combo.

For sale ad coming soon after I get info from JohnDoe and my datalogs to be specific about spool rpms, etc.
Attached Thumbnails
My newest Absurdflow manifold: BEGI FM tubular replacement-absurdflow-vs-begi_hp.jpg   My newest Absurdflow manifold: BEGI FM tubular replacement-absurdflow-vs-begi_tq.jpg  
TurboTim is offline   Reply With Quote
Old 05-04-2009, 01:42 PM   #53
Elite Member
iTrader: (30)
 
Join Date: Aug 2007
Location: Va Beach
Posts: 7,282
Total Cats: 0
Default

damn, that's awesome Tim. Any plans for us 1.6 guys?
__________________
Best Car Insurance | Auto Protection Today | FREE Trade-In Quote
levnubhin is offline   Reply With Quote
Old 05-04-2009, 02:59 PM   #54
Elite Member
Thread Starter
iTrader: (9)
 
TurboTim's Avatar
 
Join Date: Jun 2006
Location: Chesterfield, NJ
Posts: 6,485
Total Cats: 248
Default

I'll build whatever.
TurboTim is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Project Gemini - Turbo Civic on the Cheap Full_Tilt_Boogie Build Threads 58 12-13-2017 10:04 PM
Need help - Stock Balancer and Fastforward overlay pulleys Frank_and_Beans Supercharger Discussion 13 09-12-2016 09:17 PM
Expected intake temps on the track? tazswing Race Prep 20 10-03-2015 12:04 PM
Walbro 255lph Fuel Pump $50 lsc224 Miata parts for sale/trade 2 10-01-2015 10:17 AM
Bad head gasket or ? shooterschmidty Engine Performance 8 09-30-2015 11:28 PM


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 06:01 PM.