interesting DP option - 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 07-18-2007, 08:58 AM   #1
Elite Member
Thread Starter
iTrader: (8)
 
Join Date: Sep 2006
Location: Severn, MD
Posts: 1,927
Total Cats: 5
Default interesting DP option

Anyone want to guinea pig the fitment of this along with the GT28 V-band discharge? Could be a good start to a very slick downpipe if it'll fit.

http://www.atpturbo.com/Merchant2/me...egory_Code=BCS

And I'm sure Wideopentuning would hook us up with a price on the two.

If I knew it would get past the firewall, I'd get it as I'm looking at upgrading my DP now.

Frank
fmowry is offline   Reply With Quote
Old 07-18-2007, 09:33 AM   #2
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,847
Total Cats: 1,788
Default

it would be better if the sold it without the flex.
Braineack is offline   Reply With Quote
Old 07-18-2007, 10:04 AM   #3
Elite Member
iTrader: (5)
 
m2cupcar's Avatar
 
Join Date: Jan 2005
Location: Atlanta
Posts: 7,236
Total Cats: 288
Default

It looks to me like that angle cut at the elbow/flex junction is aiming the exhaust right at the bottom curve of the flex pipe. Seems like that would make a mess of flow. There's probably $100 worth of parts there - surely somebody could weld one up for $75 and make it more flow/miata friendly? Nonetheless I enjoy ATPs products/site - innovative stuff.
m2cupcar is offline   Reply With Quote
Old 07-18-2007, 11:27 AM   #4
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

first of all, the turbine outlet should be 2-1/4 to 2-1/2.

second of all, that ****'s too big for a miata.

third, you only need a flex if your pipe is limp.
y8s is offline   Reply With Quote
Old 07-18-2007, 11:42 AM   #5
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,847
Total Cats: 1,788
Default

tell them to make this guy in 2.5"

Braineack is offline   Reply With Quote
Old 07-18-2007, 12:21 PM   #6
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

if they made something, i'd go for a 2.5 with a gentle increase to 3 with v-bands at both ends. yum.
y8s is offline   Reply With Quote
Old 07-18-2007, 12:34 PM   #7
Elite Member
Thread Starter
iTrader: (8)
 
Join Date: Sep 2006
Location: Severn, MD
Posts: 1,927
Total Cats: 5
Default

Quote:
Originally Posted by y8s View Post
first of all, the turbine outlet should be 2-1/4 to 2-1/2.

second of all, that ****'s too big for a miata.

third, you only need a flex if your pipe is limp.
It's 3 inch so it mates to this:

http://www.atpturbo.com/Merchant2/me..._Code=ATP-FLS1

It's too big as in no way it will fit, or as in, there's no need for 3 inch? I could argue it's too big, just as a 3 inch exhaust on a sub 300 whp Miata is too big, but why limit for future upgrades?

Frank
fmowry is offline   Reply With Quote
Old 07-18-2007, 12:39 PM   #8
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,847
Total Cats: 1,788
Default

i think external wastegating terms it would be big, as the turbine outlet would only be something like 2.5", but for the integrated wategate, 3" is probably best. right mr y8s?
Braineack is offline   Reply With Quote
Old 07-18-2007, 12:39 PM   #9
Miotta FTW!
iTrader: (24)
 
Splitime's Avatar
 
Join Date: Jun 2006
Location: Chicagoland, IL
Posts: 4,293
Total Cats: 26
Default

3" on a turbo car is never overkill. Those that say it is, don't like faster spool... or freeing up power.
Heck... I'd run bigger or none at all if it was practical (noise/smell)

I doubt a generic piece like that would fit our very specific application. Getting one made would be wiser.

BTW... someone buy my ATP gt28rs Vband adapter....
Splitime is offline   Reply With Quote
Old 07-18-2007, 12:47 PM   #10
Elite Member
Thread Starter
iTrader: (8)
 
Join Date: Sep 2006
Location: Severn, MD
Posts: 1,927
Total Cats: 5
Default

Clearance at the firewall ledge and by the tranny is the issue for it being too big.

I though neogenisis bought that Vband adapter? Didn't yours have like 10 bolt holes? Are there different T28 outlet patterns?

Frank
fmowry is offline   Reply With Quote
Old 07-18-2007, 12:49 PM   #11
Miotta FTW!
iTrader: (24)
 
Splitime's Avatar
 
Join Date: Jun 2006
Location: Chicagoland, IL
Posts: 4,293
Total Cats: 26
Default

He changed his mind on turbo. He'll be running something else, so I still have it.
Splitime is offline   Reply With Quote
Old 07-18-2007, 12:56 PM   #12
Senior Member
 
Join Date: Oct 2005
Location: Knoxville
Posts: 1,168
Total Cats: 0
Default

That 3" looks similar to my custom setup, only with a sharper angle at the turbo. Should work very well. Firewall ledge can be cut.
Al Hounos is offline   Reply With Quote
Old 07-18-2007, 01:01 PM   #13
Elite Member
Thread Starter
iTrader: (8)
 
Join Date: Sep 2006
Location: Severn, MD
Posts: 1,927
Total Cats: 5
Default

Quote:
Originally Posted by Al Hounos View Post
That 3" looks similar to my custom setup, only with a sharper angle at the turbo. Should work very well. Firewall ledge can be cut.
Doesn't your HKS manifold drop the turbo lower though? Pics?

Frank
fmowry is offline   Reply With Quote
Old 07-18-2007, 01:03 PM   #14
Senior Member
 
Join Date: Oct 2005
Location: Knoxville
Posts: 1,168
Total Cats: 0
Default

No, the HKS manifold is top mount, like a greddy. https://www.miataturbo.net/forums/vb...do=view&id=597
Al Hounos is offline   Reply With Quote
Old 07-18-2007, 01:22 PM   #15
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

Quote:
Originally Posted by fmowry View Post
It's too big as in no way it will fit, or as in, there's no need for 3 inch? I could argue it's too big, just as a 3 inch exhaust on a sub 300 whp Miata is too big, but why limit for future upgrades?

Frank
I saw the GT25 3" Vband flange.... which is OK but too big means too BIG overall. you'd need a 1969 camaro to fit that thing in your engine bay.

I think 3" on anything over 200 hp is great. i "believe" it helps spool. But it should be a smoother transition. like mentioned here and there the magic number is 11 divergent angle at the outlet.

So that's like 2.5 or so inches of expansion from 2.5 to 3" and then it's cool.

I tried to do that on mine but I'll be damned if the whole thing ended up even with the firewall.

Find me a 2.5 to 3" expanding 90 and we're talkin!
y8s is offline   Reply With Quote
Old 07-18-2007, 03:44 PM   #16
Elite Member
iTrader: (5)
 
m2cupcar's Avatar
 
Join Date: Jan 2005
Location: Atlanta
Posts: 7,236
Total Cats: 288
Default

It can probably be done, but the manifold needs to be designed around fitting a 3" downpipe.
m2cupcar is offline   Reply With Quote
Old 07-18-2007, 04:25 PM   #17
Junior Member
iTrader: (8)
 
Join Date: Jun 2005
Location: Lansdale, PA
Posts: 426
Total Cats: 0
Default

I think Braineack's solid pipe version will work. Not a very cost effective route to take though. You're close to 300 dollars with just top half of the downpipe and turbine flange. You still need to buy a v-mount clamp and figure out what to do with the lower half of your downpipe. You're probably better off having a local fab shop make you a downpipe.
Stripes is offline   Reply With Quote
Old 07-19-2007, 03:29 PM   #18
Elite Member
iTrader: (9)
 
TurboTim's Avatar
 
Join Date: Jun 2006
Location: Chesterfield, NJ
Posts: 6,484
Total Cats: 248
Default

Quote:
Originally Posted by m2cupcar View Post
It can probably be done, but the manifold needs to be designed around fitting a 3" downpipe.
Yep. My first DIY turbo had a "bell mouth" 3" downpipe, using the GT2560R and ATP's "oval" 3" flange. The turbo was placed so I could do a 3" pipe and keep A/C and P/S. I necked down to 2.5" down below next to the transmission. If/when I reuse it I'll cut off the 2.5" transition and keep it 3".

I agree with Y8S that if you had an external WG, 3" at the turbo flange is not good. You want smooth long transitions from 2.25 (or whatever the turbine outlet diameter is) to whatever size your exhaust is...3" right?! This 3" DP was for a normal internally WG setup.



EDIT: OH, this pipe was done with Vibrant's 3" pipe, not ATP's awesome tight-radius 3" pipes. ******* horray for those.
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 57 07-19-2017 05:11 PM
WTB MP62 (Hotside) (NB2) Rick02R WTB 3 01-03-2016 08:18 PM
Back to Stock Part Out!! Turbo Parts, MS2 Enhanced 01-05, Suspension, and MOAR! StratoBlue1109 Miata parts for sale/trade 16 10-02-2015 10:39 AM
Leaky Wilwoods mx592 Suspension, Brakes, Drivetrain 1 10-01-2015 01:45 AM


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 05:35 AM.