Another boost controller thread - Page 2 - 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 01-25-2010, 09:00 PM   #21
Elite Member
iTrader: (13)
 
Join Date: Dec 2006
Location: Taos, New mexico
Posts: 5,702
Total Cats: 237
Default

Interesting link 18psi. I wasn't actually aware of that, all i know is my turboxs mbc holds boost better than any ive used. As far as i know i did not lose any spool by switching, but ill be testing this come spring. We can let the logs decide.
Fireindc is offline   Reply With Quote
Old 01-25-2010, 10:55 PM   #22
Murderator
Thread Starter
iTrader: (76)
 
18psi's Avatar
 
Join Date: Apr 2008
Posts: 36,165
Total Cats: 2,573
Default

Well with my wg spring currently I'm at 3600 full boost in 2nd gear on a short *** 6 speed. before with the stock motor, 12psi and 5 speed after installing mbc it didn't really help spool time, but the spool CHARACTERISTICS. When it would come on really smooth/gradually before, then with the hallman mbc it would SKULLFUCK me so hard I'd have to start steering my way out of it. Kinda liked the sudden torque onset, even though my tires didnt
18psi is offline   Reply With Quote
Old 01-27-2010, 04:00 PM   #23
Junior Member
iTrader: (6)
 
Join Date: Mar 2009
Location: Los Gatos, CA
Posts: 120
Total Cats: 0
Default

Quote:
Originally Posted by Braineack View Post
the grainier valve MBC pwns that ebay one...
How so?... just curious.

I have the ebay unit and I get about 2 psi variation throughout the boost curve (+/- 1 psi from target boost). Added a ceramic ball and it did nothing to help.

you suppose a grainger valve could keep boost more consistent?

also, I noticed that on the dyno, boost was flat as a table, but 4th gear street pulls it jumps up and down like 1-2psi. what the hell?
Slayer is offline   Reply With Quote
Old 01-27-2010, 04:03 PM   #24
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,814
Total Cats: 1,780
Default

I've had that first ebc boost controller and was never really happy with it, enter the current one and boost has never been flatter. that's about all i can tell you.
Braineack is offline   Reply With Quote
Old 01-28-2010, 03:39 PM   #25
Elite Member
 
Join Date: Dec 2008
Location: Colorado
Posts: 1,669
Total Cats: 36
Default

I just got lazy and bought a Joe P unit and had 0 issues with it on my old DSM. I also had a homebrew that did very well.
Sparetire is offline   Reply With Quote
Old 01-31-2010, 10:07 PM   #26
Murderator
Thread Starter
iTrader: (76)
 
18psi's Avatar
 
Join Date: Apr 2008
Posts: 36,165
Total Cats: 2,573
Default

Just got back from a slight tune with the mbc set at the same 8psi I was running before.

WHAT A DIFFERENCE. Didn't increase power, but the midrange is SO much better now. Spool is about 100-200 earlier (I was hoping for a bit better but oh well), but boost onset is just so much more VIOLENT
Love it.

I'll enjoy it at only 8 for now and then turn it up as I get bored again

This thing is TOUCHY as a ****. One tiny little turn and the pressure increases drastically.





***edit
On the other hand, it was at 165-170. Thats actually 10psi. Or am I smoking crack?
18psi is offline   Reply With Quote
Old 02-01-2010, 08:25 AM   #27
Junior Member
iTrader: (1)
 
Sentic's Avatar
 
Join Date: Feb 2008
Location: Sweden
Posts: 435
Total Cats: 5
Default

Nice to hear that the eba one is good.

Can someone please explain to me why there is a vent hole in the grainger valve? With ball and spring, why is that needed?
Sentic is offline   Reply With Quote
Old 02-01-2010, 09:26 AM   #28
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,814
Total Cats: 1,780
Default

Quote:
Originally Posted by 18psi View Post
***edit
On the other hand, it was at 165-170. Thats actually 10psi. Or am I smoking crack?

170kPa - 100 / 7 = 10psi
Braineack is offline   Reply With Quote
Old 02-01-2010, 02:16 PM   #29
Junior Member
iTrader: (1)
 
Sentic's Avatar
 
Join Date: Feb 2008
Location: Sweden
Posts: 435
Total Cats: 5
Default

Quote:
Originally Posted by Sentic View Post
Can someone please explain to me why there is a vent hole in the grainger valve? With ball and spring, why is that needed?
I'll try to answer my own question.

-it's there to vent of the initial little boost leak past the ball and therefore give even better boost onset properties.
Sentic is offline   Reply With Quote
Old 02-01-2010, 02:20 PM   #30
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,814
Total Cats: 1,780
Default

Quote:
Originally Posted by Sentic View Post
-it's there to vent of the initial little boost leak past the ball and therefore give even better boost onset properties.
or the official reason: so you don't trap boost within the diaphragm and ball.
Braineack is offline   Reply With Quote
Old 02-02-2010, 07:28 AM   #31
Junior Member
iTrader: (1)
 
Sentic's Avatar
 
Join Date: Feb 2008
Location: Sweden
Posts: 435
Total Cats: 5
Default

Of course.
Sentic is offline   Reply With Quote
Old 04-07-2010, 08:16 PM   #32
Junior Member
iTrader: (10)
 
Join Date: Jan 2008
Location: Manassas, VA
Posts: 232
Total Cats: 3
Default

Quote:
Originally Posted by Braineack View Post
Build this: http://www.gusmahon.org/html/boostcontrol.htm

you wont be disappointing with your $15 invest.
The walkthru on this website is making my head spin. It says to drill a tiny hole in the barb but the illustrations make me think I need to drill a hole into the top of the relief valve. Someone please dumb this down for me.
wrxnova is offline   Reply With Quote
Old 04-07-2010, 09:04 PM   #33
Senior Member
iTrader: (22)
 
Join Date: Oct 2007
Location: bay area, ca
Posts: 551
Total Cats: 19
Default

Quote:
Originally Posted by wrxnova View Post
The walkthru on this website is making my head spin. It says to drill a tiny hole in the barb but the illustrations make me think I need to drill a hole into the top of the relief valve. Someone please dumb this down for me.
I had some for sale with a picture of where I drilled the hole in the 90 degree fitting:

https://www.miataturbo.net/miata-parts-sale-trade-5/mcmaster-manual-boost-controllers-45217/

FM drills it in the side of the fitting - probably because it's easier to lay the thing flat and drill it that way.
orion4096 is offline   Reply With Quote
Old 04-07-2010, 10:00 PM   #34
Junior Member
iTrader: (10)
 
Join Date: Jan 2008
Location: Manassas, VA
Posts: 232
Total Cats: 3
Default

Thanks for links to pics thats exactly what I needed to see.
wrxnova is offline   Reply With Quote
Old 04-07-2010, 10:20 PM   #35
Senior Member
iTrader: (1)
 
Join Date: Oct 2008
Location: Trailer County
Posts: 530
Total Cats: -9
Default

Ok, where is this thread about?

I guess "I'll give yo a dolla applies" red neck style... LOL


Just a FYI, I got the cheapo EBAY, as I am a ebay ***** whatever way it is spelled in correct caucasian english, and works fine, stays true to its 15 psi.
mazpr is offline   Reply With Quote
Old 04-07-2010, 10:41 PM   #36
Elite Member
iTrader: (8)
 
Join Date: Aug 2007
Location: Bellingham, Wa
Posts: 2,732
Total Cats: 3
Default

Is it just me or does that grainger valve writeup not include necessary details such as spring type and length, Ball size and fitting sizes?

I made an MBC like the ebay one and dont even use it anymore because the boost was all over the place. It could be my ball size or my spring type or just that its too sensitive for 12psi but boost is up and down through the whole power band.
wayne_curr is offline   Reply With Quote
Old 04-08-2010, 09:09 AM   #37
Junior Member
iTrader: (10)
 
Join Date: Jan 2008
Location: Manassas, VA
Posts: 232
Total Cats: 3
Default

Quote:
Originally Posted by wayne_curr View Post
Is it just me or does that grainger valve writeup not include necessary details such as spring type and length, Ball size and fitting sizes?
For future reference the grainger manual boost controllers relief valve is part # 5Z763.

http://www.grainger.com/Grainger/wwg...N=0&sst=subset

Specs :

Vacuum/Pressure Relief Valve, MNPT Inlet 1/4 In, Flow Capacity 0-2 CFM, Pressure Range 0 to 20 PSI, Vacuum Range 0 to 30 Inches Hg, Max Temp 250 F, Brass Body Material, Stainless Steel Ball Poppet, Stainless Steel Spring Material, Hex 9/16 In, Length 1 3/4 In, Easily Convert from Vacuum to Pressure Relief by Reversing Poppet and Spring
wrxnova is offline   Reply With Quote
Old 04-08-2010, 09:32 AM   #38
I'm a terrible person
iTrader: (19)
 
FRT_Fun's Avatar
 
Join Date: Apr 2009
Location: Arizona
Posts: 7,293
Total Cats: 180
Default

Tested out mine they all hold 12psi fine. I just followed the write-up and ordered the part numbers.
FRT_Fun is offline   Reply With Quote
Old 04-08-2010, 01:36 PM   #39
Elite Member
iTrader: (8)
 
Join Date: Aug 2007
Location: Bellingham, Wa
Posts: 2,732
Total Cats: 3
Default

Quote:
Originally Posted by wrxnova View Post
For future reference the grainger manual boost controllers relief valve is part # 5Z763.

http://www.grainger.com/Grainger/wwg...N=0&sst=subset

Specs :

Vacuum/Pressure Relief Valve, MNPT Inlet 1/4 In, Flow Capacity 0-2 CFM, Pressure Range 0 to 20 PSI, Vacuum Range 0 to 30 Inches Hg, Max Temp 250 F, Brass Body Material, Stainless Steel Ball Poppet, Stainless Steel Spring Material, Hex 9/16 In, Length 1 3/4 In, Easily Convert from Vacuum to Pressure Relief by Reversing Poppet and Spring
Oh wow, interesting. So with that controller you dont build the valve yourself out of a spring and ball bearing?
wayne_curr is offline   Reply With Quote
Old 04-08-2010, 01:48 PM   #40
Junior Member
iTrader: (10)
 
Join Date: Jan 2008
Location: Manassas, VA
Posts: 232
Total Cats: 3
Default

Quote:
Originally Posted by wayne_curr View Post
Oh wow, interesting. So with that controller you dont build the valve yourself out of a spring and ball bearing?
Correct, all thats needed is :

(1) Grainger relief valve #5Z763

(1) female 1/4 hose barb

(1) 1/4 hose barb mender (aka double sided barb) ideally 90*
wrxnova 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
OTS Bilstein to motorsports ASN conversion stoves Suspension, Brakes, Drivetrain 5 04-21-2016 04:00 PM
Going back to stock. Need some 1.6 parts. Trent WTB 2 10-01-2015 01:15 PM
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 11:38 AM.