The needy noob is back. - 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 08-13-2016, 02:18 PM   #1
Newb
Thread Starter
 
Join Date: Feb 2016
Posts: 40
Total Cats: 0
Default The needy noob is back.

Hello interwebs! I lack boost still pushing 5psi. I needed a new clutch, better tune, and allumium rad first. Finished all that this week. I'm running a td04hl-15g with a nice taco taco mani. I have reason to believe that my MBC is not working. I keep turning it and TS still says 5psi same with my boost gauge.

I'm going to post my finished pics up of the build. Also, can someone double check my MBC set up. MBC to wg and to compressor housing. Might be hard to see the compressor pic. It's the lower line with brass barb.







ads5053 is offline   Reply With Quote
Old 08-13-2016, 02:35 PM   #2
Junior Member
iTrader: (1)
 
Join Date: Jan 2016
Location: Utah
Posts: 109
Total Cats: -30
Default

Could be your boost controller, could be your diaphragm, could be boost leak, could be a miscalculation.
When I first put my turbo I thought it was making around 20+psi of boost until someone told me you have to subtract 100 kpa for atmosphere so I thought I was making like 4, but at my elevation its only 86 kpa, so it was right where it was supposed to be (8 psi no boost controller, just spring pressure)
Pretending2koolz is offline   Reply With Quote
Old 08-13-2016, 02:40 PM   #3
Newb
Thread Starter
 
Join Date: Feb 2016
Posts: 40
Total Cats: 0
Default

It's was 5psi without controller. Installed controller and it's still 5psi. I checked all the ic pipes for leaks. Don't even know what a diaphram is of where it is lol.
ads5053 is offline   Reply With Quote
Old 08-13-2016, 03:17 PM   #4
Sadfab Union President
iTrader: (3)
 
Join Date: May 2014
Location: Kansas
Posts: 2,690
Total Cats: 115
Default

lol

That's a regulator, it lets all air pressure up to a certain point pass through and only then will it act as a restriction.

How are you going to use that to increase boost past the wastegate setting? It always leaks pressure, there's no way for it to clamp down 100% and only pass pressure greater than 5psi.

The simple answer is it physically can't. You did it wrong.

deezums is offline   Reply With Quote
Old 08-13-2016, 03:40 PM   #5
Newb
Thread Starter
 
Join Date: Feb 2016
Posts: 40
Total Cats: 0
Default

I figured it was wrong... Although I followed the directions that came with the controller. How do I hook it up so it works?
ads5053 is offline   Reply With Quote
Old 08-13-2016, 05:08 PM   #6
Elite Member
iTrader: (6)
 
Join Date: Feb 2013
Location: Staunton, Va
Posts: 1,857
Total Cats: 128
Default

It's not going to, I don't think. Is it an actual boost control or a regulator from lowes? It looks like a air compressor regulator, which won't work.
ryansmoneypit is offline   Reply With Quote
Old 08-13-2016, 05:13 PM   #7
Newb
Thread Starter
 
Join Date: Feb 2016
Posts: 40
Total Cats: 0
Default

It's a turbonetics boost controller from aa auto.
https://m.summitracing.com/parts/tnt-10402-25?seid=srese1&cm_mmc=pla-google-_-shopping-_-srese1-_-turbonetics&gclid=CjwKEAjwiru9BRDwyKmR08L3iS0SJABN 8T4vKI4GZURkFf3yBGo4ZIW80emk7hfh8PrjYoKbNhGHYRoCeH nw_wcB
ads5053 is offline   Reply With Quote
Old 08-14-2016, 12:49 PM   #8
Newb
Thread Starter
 
Join Date: Feb 2016
Posts: 40
Total Cats: 0
Default

Always the last place you look lol... Since I couldn't find a leak I tried to readjust the recirulaating valve hose. Noticed a hairline crack. Popped it off with a little pressure for the pic. That's right before the throttle body. The upper rad hose got in my way when I was looking for leaks.
ads5053 is offline   Reply With Quote
Old 08-15-2016, 11:44 AM   #9
Junior Member
 
Join Date: Jul 2014
Location: Kensington, MD
Posts: 267
Total Cats: -20
Default

Nice prop rod!
huesmann is offline   Reply With Quote
Old 08-15-2016, 11:49 AM   #10
SadFab CEO
iTrader: (3)
 
Join Date: Sep 2012
Location: your mom's house phoenix, AZ
Posts: 3,552
Total Cats: 446
Default

They don't say much about it, but I swear that's a dam compressed air regulator. It even has the "pull to adjust" cast into the cap. So that's about $20 in parts you just paid $107 for? It must suck to suck.

And although that pipe is a boost leak now, the hairline crack that it was, probably wasn't large enough to be a significant boost leak. That's not your issue.
hi_im_sean is offline   Reply With Quote
Old 08-15-2016, 11:52 AM   #11
SadFab CEO
iTrader: (3)
 
Join Date: Sep 2012
Location: your mom's house phoenix, AZ
Posts: 3,552
Total Cats: 446
Default

Also-

"Change your boost level from the cockpit of your car with the Turbonetics VBC kit. The VBC kit can adjust boost pressure on any external wastegate or factory dual port actuator. Adjustable from stock to the indicated pressure above stock. Dual port actuator only."

https://turboneticsinc.com/store/ind...product_id=406
hi_im_sean is offline   Reply With Quote
Old 08-15-2016, 11:54 AM   #12
Sadfab Union President
iTrader: (3)
 
Join Date: May 2014
Location: Kansas
Posts: 2,690
Total Cats: 115
Default

I looked up the install directions and couldn't make sense of it. Using certain sized brass t's for different boost ranges?

Only way I see something like that working is if it's a bleed type boost regulator, which means it might be a very low pressure regulator and those are usually more expensive.

But I guess if it's only for dual port gates it makes a little more sense...
deezums is offline   Reply With Quote
Old 08-15-2016, 11:56 AM   #13
SadFab CEO
iTrader: (3)
 
Join Date: Sep 2012
Location: your mom's house phoenix, AZ
Posts: 3,552
Total Cats: 446
Default

Quote:
Originally Posted by deezums View Post
I looked up the install directions and couldn't make sense of it. Using certain sized brass t's for different boost ranges?

Only way I see something like that working is if it's a bleed type boost regulator, which means it might be a very low pressure regulator and those are usually more expensive.
It must be. Would explain why they are making you use different fitting as orifices. Could have done so much better for $107.
hi_im_sean is offline   Reply With Quote
Old 08-15-2016, 12:23 PM   #14
Newb
Thread Starter
 
Join Date: Feb 2016
Posts: 40
Total Cats: 0
Default

Suggest something for me. I wanted a MBC and didn't want to wait for Amazon prime. I didn't care about the 100$ that much. I knew my impatience was costing me to pay a hefty premium. I could probably still return it.
ads5053 is offline   Reply With Quote
Old 08-15-2016, 12:53 PM   #15
Sadfab Union President
iTrader: (3)
 
Join Date: May 2014
Location: Kansas
Posts: 2,690
Total Cats: 115
Default

I suggest you try this



Close the valve 100%, then slowly start opening it, should bring the boost up.

Or you can make an adjustable check valve, like this here

The"D.I.Y."Manual Boost Control
deezums is offline   Reply With Quote
Old 08-15-2016, 01:13 PM   #16
Newb
Thread Starter
 
Join Date: Feb 2016
Posts: 40
Total Cats: 0
Default

Ok. I'll give it a shot. Btw, here are the actual instructions with the unit I bought.


ads5053 is offline   Reply With Quote
Old 08-15-2016, 01:20 PM   #17
Murderator
iTrader: (76)
 
18psi's Avatar
 
Join Date: Apr 2008
Posts: 33,795
Total Cats: 2,116
Default

Yeah, you bought a piece of junk worth about 20 for 100. return it if you can.
run a ball/spring mbc like everyone else.

you want a really good one without having to build it? hallman pro rx. use it on the cars that need a mbc. works perfect, every time
18psi is offline   Reply With Quote
Old 08-15-2016, 03:15 PM   #18
Newb
Thread Starter
 
Join Date: Feb 2016
Posts: 40
Total Cats: 0
Default

So, they sell the homemade one on Amazon for 22$. For a 12psi set up what would be the advantage of running the hallman version for 90$? I'm probably going to make it today tbh.
ads5053 is offline   Reply With Quote
Old 08-16-2016, 11:51 AM   #19
Newb
Thread Starter
 
Join Date: Feb 2016
Posts: 40
Total Cats: 0
Default

All done. Returned that pos and I looked at the receipt noticed the price was 200$. They price matched for me when I was there. When it was working the boost levels were inconsistent anyways. I made the ball and spring and for the first time the build feels complete. Now let's see how I do at the next autocross @ Pocono. Thanks guys.
ads5053 is offline   Reply With Quote
Old 08-16-2016, 11:58 AM   #20
Murderator
iTrader: (76)
 
18psi's Avatar
 
Join Date: Apr 2008
Posts: 33,795
Total Cats: 2,116
Default

the hallman would be more precise and stable, just overall higher quality and more precise operation.

but the DIY setup is fine, I've used it before and it works. glad you were able to return the junk one
18psi is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Check my spark table LyonsMiata27 MEGAsquirt 3 04-21-2016 07:29 PM
Boost by Gear joejoepop ECUs and Tuning 29 04-18-2016 09:55 PM
Double check my ms3x build p0staldude MEGAsquirt 5 03-31-2016 01:03 PM
Posted my dyno numbers and pics!!! 92Black&Tan Prefabbed Turbo Kits 1 08-15-2006 08:38 AM
hard top miata the only way to go johnclev6 Insert BS here 89 07-22-2006 07:53 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 02:12 AM.