More Boost? - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


Prefabbed Turbo Kits A place to discuss prefabricated turbo kits on the market
Sponsored by:
Sponsored by:

Reply
 
 
 
LinkBack Thread Tools
Old 12-10-2008, 08:07 PM   #1
Newb
Thread Starter
 
Join Date: Jan 2008
Location: Woodbine, MD
Posts: 14
Total Cats: 0
Default More Boost?

I have a Begi S4 with a 2860rs, largest intercooler in begi terms (~20x10x2.5), 550's, Xede, and a Turbosmart E-Boost 2 boost controller on my 2002. I have consistently been seeing 11-12.5 max psi even with my boost controller set at up to 16 through 30 lbs for over boost shutdown and set points. Shouldn't this turbo be more than capable of making much more than 12.5 psi in a 4th gear wot run? Not that I'll go much higher because of stock internals, but just very curious why my peak boost isnt responding no matter where my boost controller is set at. Any ideas?
mxbean is offline   Reply With Quote
Old 12-10-2008, 08:33 PM   #2
Elite Member
iTrader: (8)
 
Join Date: Oct 2007
Location: Dallas
Posts: 1,841
Total Cats: 0
Default

First, I know nothing of ebc. But yes that is way more capabable than 12psi.
Can you feel a difference in power at the diference in boost settings. You may want to try a friends gauge. But if there is no power difference.
Check for leaks. I would think the tubing would blow off if leaking.

You might want to get a $10 manual controller until summer when the temp stabilizes. Just my .02.
Toddcod is offline   Reply With Quote
Old 12-10-2008, 08:44 PM   #3
Elite Member
iTrader: (22)
 
Join Date: Dec 2006
Location: Sunny Spanish speaking Non US Caribbean
Posts: 3,257
Total Cats: 3
Default

Quote:
Originally Posted by mxbean View Post
I have a Begi S4 with a 2860rs, largest intercooler in begi terms (~20x10x2.5), 550's, Xede, and a Turbosmart E-Boost 2 boost controller on my 2002. I have consistently been seeing 11-12.5 max psi even with my boost controller set at up to 16 through 30 lbs for over boost shutdown and set points. Shouldn't this turbo be more than capable of making much more than 12.5 psi in a 4th gear wot run? Not that I'll go much higher because of stock internals, but just very curious why my peak boost isnt responding no matter where my boost controller is set at. Any ideas?
I think you should ask Stephanie at Begi about the settings on your Xede. Maybe that's what's limiting you?

If I were you I wouldn't go over 12 psi on stock internals;especially on an NC! (isn't the 2002 an NC?)
Rafa is offline   Reply With Quote
Old 12-10-2008, 08:51 PM   #4
Newb
Thread Starter
 
Join Date: Jan 2008
Location: Woodbine, MD
Posts: 14
Total Cats: 0
Default

Quote:
Originally Posted by Toddcod View Post
First, I know nothing of ebc. But yes that is way more capabable than 12psi.
Can you feel a difference in power at the diference in boost settings. You may want to try a friends gauge. But if there is no power difference.
Check for leaks. I would think the tubing would blow off if leaking.

You might want to get a $10 manual controller until summer when the temp stabilizes. Just my .02.

Thanks for the reply. There is no difference in power and the gauge is reading accurately. We had set peak boost to 30psi on the controller on a dyno with the same hp results. (My boost pressure lines up with what the dyno measured) Good idea on the MBC, I might try that. Any other thoughts?
mxbean is offline   Reply With Quote
Old 12-10-2008, 08:59 PM   #5
Newb
Thread Starter
 
Join Date: Jan 2008
Location: Woodbine, MD
Posts: 14
Total Cats: 0
Default

Quote:
Originally Posted by Rafa View Post
I think you should ask Stephanie at Begi about the settings on your Xede. Maybe that's what's limiting you?

If I were you I wouldn't go over 12 psi on stock internals;especially on an NC! (isn't the 2002 an NC?)

Possibly, Ill ask tomorrow.

Haha, I wont go too much more. It just bugs me why my ebc seems like its worthless and not doing what its told. Good thing it didnt start working when we set it to 30 psi! NC's are 05 + I think..
mxbean is offline   Reply With Quote
Old 12-10-2008, 09:00 PM   #6
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,900
Total Cats: 1,792
Default

I have a feeling it's just running wastegate....
Braineack is offline   Reply With Quote
Old 12-10-2008, 09:05 PM   #7
Newb
Thread Starter
 
Join Date: Jan 2008
Location: Woodbine, MD
Posts: 14
Total Cats: 0
Default

Quote:
Originally Posted by Braineack View Post
I have a feeling it's just running wastegate....

Isnt it a 9 psi spring though?
mxbean is offline   Reply With Quote
Old 12-10-2008, 09:51 PM   #8
Supporting Vendor
iTrader: (31)
 
Savington's Avatar
 
Join Date: Nov 2006
Location: Sunnyvale, CA
Posts: 14,372
Total Cats: 1,332
Default

Doesn't mean it will run 9psi.
Savington is online now   Reply With Quote
Old 12-10-2008, 10:04 PM   #9
Murderator
iTrader: (76)
 
18psi's Avatar
 
Join Date: Apr 2008
Posts: 36,202
Total Cats: 2,584
Default

if its cold out I have seen as much as 4psi boost creep so its definitely possible you are running on wastegate. the fact that you turn it up as much as possible and nothing happens is a big give away. believe me, even on a small turbo, if you turn up the controller all the way, that ****** will spike so high you will most likely break something. i'll bet the vacuum lines from your controller are either not hooked up properly or leaking somewhere.
18psi is offline   Reply With Quote
Old 12-10-2008, 10:45 PM   #10
Newb
Thread Starter
 
Join Date: Jan 2008
Location: Woodbine, MD
Posts: 14
Total Cats: 0
Default

On my way home from work this evening I swapped in the old tube from compressor to wastegate, deleting all e boost controlling. I had consistent runs of ~8psi and peak at 9.5 when I got home. So it seems that my EBC is working sort of, but only letting another 4psi through.. Any ideas?
mxbean is offline   Reply With Quote
Old 12-10-2008, 10:50 PM   #11
Murderator
iTrader: (76)
 
18psi's Avatar
 
Join Date: Apr 2008
Posts: 36,202
Total Cats: 2,584
Default

bad/broken boost controller? leaky? sounds like it
18psi is offline   Reply With Quote
Old 12-10-2008, 10:54 PM   #12
Newb
Thread Starter
 
Join Date: Jan 2008
Location: Woodbine, MD
Posts: 14
Total Cats: 0
Default

Quote:
Originally Posted by 18psi View Post
bad/broken boost controller? leaky? sounds like it

Hope not! Its nearly new.
mxbean is offline   Reply With Quote
Old 12-10-2008, 10:59 PM   #13
Elite Member
iTrader: (22)
 
Join Date: Dec 2006
Location: Sunny Spanish speaking Non US Caribbean
Posts: 3,257
Total Cats: 3
Default

Courtesy of braineack. I just ordered and got one from ebay but he's got a $10 special on his website: NXS Racing Division
Rafa is offline   Reply With Quote
Old 12-11-2008, 03:50 AM   #14
Elite AbsurdFlow Member
 
Laur3ns's Avatar
 
Join Date: Mar 2008
Location: Enschede, NL
Posts: 2,058
Total Cats: 11
Default

What is your exhaust setup like? A clogged cat or OEM exhaust may be a limiting factor here I think.
Laur3ns is offline   Reply With Quote
Old 12-11-2008, 11:37 AM   #15
Senior Member
iTrader: (5)
 
Join Date: Dec 2007
Location: worcester ma
Posts: 1,124
Total Cats: 0
Default

i think its the boost controller, cuz i had the same issue, i only saw 6psi through mine, then i swapped controllers, i got that bad boy up to 14 psi real quick
urgaynknowit is offline   Reply With Quote
Old 12-11-2008, 08:06 PM   #16
Newb
Thread Starter
 
Join Date: Jan 2008
Location: Woodbine, MD
Posts: 14
Total Cats: 0
Default

Quote:
Originally Posted by Spookyfish View Post
What is your exhaust setup like? A clogged cat or OEM exhaust may be a limiting factor here I think.
I have the seperated gases downpipe and a FM turbo exhaust. Everything is used for the first time.

Maybe I'll see if I can get one of those mbc's, Rafa, and if that does it, I'll get a replacement solenoid.

Thanks for the input guys.
mxbean is offline   Reply With Quote
Old 12-11-2008, 08:10 PM   #17
Elite Member
iTrader: (7)
 
samnavy's Avatar
 
Join Date: Apr 2006
Location: VIRGINIA BEACH, VA
Posts: 6,020
Total Cats: 175
Default

Every good turbo enthusiast should carry along with him a cheap and simple ball-and-spring MBC in the glove box for situations just like this. Even a year after I went EBC, I still had my $15 eBay Voodoo MBC mounted to the fenderwell exactly as I had before. No matter what, that thing was good for 14psi for any test I might need.
samnavy is offline   Reply With Quote
Old 12-11-2008, 08:18 PM   #18
Newb
Thread Starter
 
Join Date: Jan 2008
Location: Woodbine, MD
Posts: 14
Total Cats: 0
Default

Ha, very good idea.
mxbean is offline   Reply With Quote
Old 12-11-2008, 09:15 PM   #19
Elite Member
iTrader: (13)
 
Join Date: Nov 2006
Location: Tigard, Oregon
Posts: 3,908
Total Cats: 0
Default

EBC is my 1st choice for the trouble but what about the adjustment arm on the WG. It could be too loose so the flapper is never actually closed. There's been no mention so far about spool. If it's spooling slow the wg arm may be more of a possibility.
cueball1 is offline   Reply With Quote
Old 12-11-2008, 09:23 PM   #20
Newb
Thread Starter
 
Join Date: Jan 2008
Location: Woodbine, MD
Posts: 14
Total Cats: 0
Default

Quote:
Originally Posted by cueball1 View Post
EBC is my 1st choice for the trouble but what about the adjustment arm on the WG. It could be too loose so the flapper is never actually closed. There's been no mention so far about spool. If it's spooling slow the wg arm may be more of a possibility.

Quite a possibility. Full boost is achieved by about 4k rpms. Its hard to tell really, trying to look at the road, tach, and gauge. Anyway does 4k sound about right?
mxbean 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 59 12-15-2017 09:00 PM
LucaCarMods's Boosted Dutch Miata Build! LucaCarMods Build Threads 11 02-14-2016 07:13 AM
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
Going back to stock. Need some 1.6 parts. Trent WTB 2 10-01-2015 01:15 PM
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 11:32 PM.