Questions about possible manifold and dp change - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


General Miata Chat A place to talk about anything Miata

Reply
 
 
 
LinkBack Thread Tools
Old 07-16-2012, 08:53 PM   #1
Junior Member
Thread Starter
 
Join Date: Oct 2009
Location: Anderson, SC
Posts: 321
Total Cats: -2
Default Questions about possible manifold and dp change

Hey guys so I have Begi's cast manifold and begi-s downpipe and was thinking about replacing with a nice ss manifold with an ewg and getting a bigger diameter dp as well. I just ran my car at Begi's dyno day and ran 241hp at 9.75psi on a rough tune and want more of course. I also have ac and power steering and that seems to limit my options if I were to have one built. Not sure if the benefits will outweigh cost though. My spool at the moment is awful and I have a garrett actuator waiting for me at my house to see if that helps but if not it seems that either I put a restrictor in my intake/exhaust or go ewg. Thanks for your guys input!
cowboys647 is offline   Reply With Quote
Old 07-16-2012, 10:02 PM   #2
Senior Member
iTrader: (1)
 
Join Date: Sep 2008
Location: Tucson, Arizona
Posts: 889
Total Cats: 55
Default

artech begi replacement. tubular mani and 3" dp for 3" exhaust. message abe.

ARTech Fabrication - Custom Fabricating

you'll spool sooner.

/thread
krissetsfire is offline   Reply With Quote
Old 07-16-2012, 10:27 PM   #3
Elite Member
iTrader: (12)
 
Join Date: Sep 2007
Location: Charlotte, NC
Posts: 6,868
Total Cats: 66
Default

The real questions is- Why do you feel the need? What are your ultimate goals? No need for big power with that damn 4.3 rear lol. Get at least a 3.9 first. If I had my way, I jsut switch to a better trubo..like the GTX 2863.....

blingo!
Doppelgänger is offline   Reply With Quote
Old 07-16-2012, 10:54 PM   #4
Junior Member
Thread Starter
 
Join Date: Oct 2009
Location: Anderson, SC
Posts: 321
Total Cats: -2
Default

Well I know that my 4.3 isn't ideal but until I find a good deal on another it'll work. I would like to have 5-6 hundred horsepower from a v8 but since I don't have the big stack of cash and time to throw it down I can slowly build a better and better turbo set up until that point. Main reason I am considering this is because of my terrible boost creep. If the garrett actuator helps then ill /thread but if it doesn't then it seems ewg is the only worthwhile way. I was thinking about maybe drilling into the cast manifold and welding some weld els and an ewg flange on just like Begi's cast ewg. Then I could probably make a 3" downpipe with the help of my father for the welding/pipe bending skills.

Off topic but hows the fitment with people's 3" downpipes?
cowboys647 is offline   Reply With Quote
Old 07-16-2012, 11:13 PM   #5
Elite Member
iTrader: (12)
 
Join Date: Sep 2007
Location: Charlotte, NC
Posts: 6,868
Total Cats: 66
Default

Port the wastegate if you're having boost problems. I was having them when I got my new turbo and ordered a new houst housing from BEGi and had them port it. Never had a problem with my IWG setup and creep since then...and running 14psi on a 2560R. IIRC BEGi does it for free/nearly free.

I was kidna joking about the 4.3....but am half serious. I don't thinkg you have a problem nearly breaking even doing a sell/trade for that 4.3. You'll be much happier with longer gears.
Doppelgänger is offline   Reply With Quote
Old 07-17-2012, 12:53 AM   #6
Junior Member
Thread Starter
 
Join Date: Oct 2009
Location: Anderson, SC
Posts: 321
Total Cats: -2
Default

When I first got my setup it was overboosting to my 15psi overboost with no signs of stopping so I ported it via begi's instructions and now the peek boost is 9.75 but the problem is how long it takes to get there. I should be reaching max boost with my tiny turbo at 3000 or so but I'm at like 5 or 6psi at 5500 rpm and it creeps up throughout. And I agree on probably breaking even on the 4.3. It's just as this is my only car I can't really pop it off at the moment.
cowboys647 is offline   Reply With Quote
Old 07-17-2012, 01:02 AM   #7
Murderator
iTrader: (76)
 
18psi's Avatar
 
Join Date: Apr 2008
Posts: 36,175
Total Cats: 2,576
Default

if you dont have the cash to do it right, don't do it.
if you do..well...then go big or go home. full artech or absurdflow tubular, 3" all the way back, ewg, the works.

and it definitely seems like something is wrong with your setup: no way should a 2560 be spooling that slow on a 1.8
18psi is offline   Reply With Quote
Old 07-17-2012, 01:10 AM   #8
Junior Member
Thread Starter
 
Join Date: Oct 2009
Location: Anderson, SC
Posts: 321
Total Cats: -2
Default

Yea I know I shoould wait but driving a car with at least a little torque down low would make my life alot better
cowboys647 is offline   Reply With Quote
Old 07-17-2012, 01:19 AM   #9
Slowest Progress Ever
iTrader: (26)
 
thirdgen's Avatar
 
Join Date: Oct 2007
Location: The coal ridden hills of Pennsylvania
Posts: 5,806
Total Cats: 183
Default

Wait a second...am I getting this right??
You're running a GT2560 and you made 241hp at 9.75psi?
Is that at the wheels???
With a cast manifold????
thirdgen is offline   Reply With Quote
Old 07-17-2012, 01:21 AM   #10
Senior Member
iTrader: (1)
 
Join Date: Sep 2008
Location: Tucson, Arizona
Posts: 889
Total Cats: 55
Default

have you not seen the dp ****? if i didn't already have a 3" begi dp i'd buy an artech 3" dp, go happy gilmore, put that ish between my legs and do the bull dance around my house.
krissetsfire is offline   Reply With Quote
Old 07-17-2012, 01:25 AM   #11
Junior Member
Thread Starter
 
Join Date: Oct 2009
Location: Anderson, SC
Posts: 321
Total Cats: -2
Default

I'm running a Shanghai-s kit with the cast manifold and the t25/28 chinacharger comparable to a gt2854 which I believe is in between a 2554 and a 2560? and it was at the wheels. It was a bell engineering dyno day.

Edit: Kris I would love an Artech dp but I wouldn't love the price tag
cowboys647 is offline   Reply With Quote
Old 07-17-2012, 01:28 AM   #12
Slowest Progress Ever
iTrader: (26)
 
thirdgen's Avatar
 
Join Date: Oct 2007
Location: The coal ridden hills of Pennsylvania
Posts: 5,806
Total Cats: 183
Default

Holy crap!!! Those are great numbers for that kind of boost amount!!!!
What injectors were you using??
thirdgen is offline   Reply With Quote
Old 07-17-2012, 01:28 AM   #13
Senior Member
iTrader: (1)
 
Join Date: Sep 2008
Location: Tucson, Arizona
Posts: 889
Total Cats: 55
Default

Quote:
Originally Posted by cowboys647 View Post
Yea I know I shoould wait but driving a car with at least a little torque down low would make my life alot better
even with a log a 2560 on a 1.8 should have plenty of torque down low.

edit: ahh gt2854 shouldn't be tooo much diffeither.
krissetsfire is offline   Reply With Quote
Old 07-17-2012, 01:40 AM   #14
Junior Member
Thread Starter
 
Join Date: Oct 2009
Location: Anderson, SC
Posts: 321
Total Cats: -2
Default

They are rx7 460cc. And I can make a lot more torque when I get it dyno tuned because I have a super rich spot at about 4k when my turbo is almost all spooled up that robs me of it. Also I'm not at very high boost at low rpm. I'll see if I can find the dyno chart...
cowboys647 is offline   Reply With Quote
Old 07-17-2012, 01:55 AM   #15
Junior Member
Thread Starter
 
Join Date: Oct 2009
Location: Anderson, SC
Posts: 321
Total Cats: -2
Default

Ok the spool might not be assss bad but the awful richness makes it seem that way
Attached Thumbnails
Questions about possible manifold and dp change-dyno.jpg  
cowboys647 is offline   Reply With Quote
Old 07-17-2012, 02:21 AM   #16
Senior Member
iTrader: (1)
 
Join Date: Sep 2008
Location: Tucson, Arizona
Posts: 889
Total Cats: 55
Default

probably should post your msq too.
krissetsfire is offline   Reply With Quote
Old 07-17-2012, 02:34 AM   #17
Junior Member
Thread Starter
 
Join Date: Oct 2009
Location: Anderson, SC
Posts: 321
Total Cats: -2
Default

Here's the tune. And I'll try to get a datalog that shows full acceleration
Attached Files
File Type: msq CurrentTune.msq (78.9 KB, 43 views)
cowboys647 is offline   Reply With Quote
Old 07-17-2012, 02:40 AM   #18
Junior Member
Thread Starter
 
Join Date: Oct 2009
Location: Anderson, SC
Posts: 321
Total Cats: -2
Default

And here is a log that shows it pretty well
Attached Files
File Type: msl 2012-04-25_17.00.00.msl (829.8 KB, 67 views)
cowboys647 is offline   Reply With Quote
Old 07-17-2012, 09:26 AM   #19
Elite Member
iTrader: (9)
 
TurboTim's Avatar
 
Join Date: Jun 2006
Location: Chesterfield, NJ
Posts: 6,484
Total Cats: 248
Default

240rwhp @ 10psi with 2560 is on par with a good setup. If your tune was 'rough', you should be able to pick up even more and be happy. I was at 245 @ 9 with my tubular BEGI replacement mani and full 3" exhaust (IWG).

Spool shouldn't be a problem with any manifold on a 1.8 and the 2560. Focus on the actuator first.
TurboTim is offline   Reply With Quote
Old 07-17-2012, 11:08 AM   #20
Elite Member
iTrader: (17)
 
Join Date: Aug 2007
Location: Fort Myers, FL
Posts: 2,791
Total Cats: 129
Default

Quote:
Originally Posted by cowboys647 View Post
I'm at like 5 or 6psi at 5500 rpm
Have you checked for boost leaks? It's easy enough to build a tester if you've got access to an air compressor. A boost leak will really kill spool.
pdexta 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
Moroso Air Oil Separator Catch Can Aroundcorner Miata parts for sale/trade 2 10-01-2015 04:20 PM
ISO 1.6 turbo cast iron manifold cale saurage DIY Turbo Discussion 16 10-01-2015 12:25 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 03:49 AM.