Pat's Ebay Turbo Compound Boost Build - Page 15 - Miata Turbo Forum -Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


Build Threads Building a motor? Post the progress here.

Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old 02-15-2016, 09:37 PM   #281
Hug Life
iTrader: (3)
 
Monk's Avatar
 
Join Date: Apr 2014
Location: Huntington, Indiana
Posts: 2,396
Total Cats: 356
Default

Centrifugal to EFR to roots to journal bearing chinacharger.
For simplicity's sake.
Monk is offline   Reply With Quote
Old 02-15-2016, 09:43 PM   #282
Junior Member
iTrader: (2)
 
Join Date: Apr 2010
Location: albion, mi
Posts: 263
Total Cats: 13
Default


For simplicity sake.. hell, he's already been done it!
glade is offline   Reply With Quote
Old 02-15-2016, 10:39 PM   #283
Elite Member
Thread Starter
iTrader: (15)
 
patsmx5's Avatar
 
Join Date: Aug 2007
Location: Houston, TX
Posts: 7,953
Total Cats: 127
Default

Quote:
Originally Posted by deezums View Post
Yeah, that's pretty ******* terrible and I bet it has nothing to do with it being an ebay turbo. Although I've heard similar numbers from begi t2's, so maybe...

All the 1.8's can spool the larger t3 by 3K, and I can do the same on a 1.6 with corn. So why's your smaller turbo suck so much? Is something broken or did you just pick the wrong one?
I wasn't doing 5th gear pulls from 2K, I think that's pointless as nobody drives like that. I think running both wastegates with no boost controller is 1/2 the reason it's laggy. Could be a boost leak, haven't tested that yet but will once I've got a few miles on it.


Quote:
Originally Posted by Monk View Post
Any vids with exhaust noise?
I'm really curious what it sounds like.
I'm definitely not faulting you for wanting a quiet car, but I have a feeling a lot of us are more tolerant of noise.
I'll try to make a vid tomorrow. Today I was busy as I started it for 5seconds and then off, unhook front turbo drain, crank and verify oil flow, then same test for rear, then adding oil/coolant as needed.

It sounds loud, like an open downpipe car, but not as loud.


Quote:
Originally Posted by 18psi View Post
his "smaller" turbo is a 2860 or something.
it's small only relatively to the "large" one

also he's running like the crappiest exhaust manifold known to mankind

...even still, I'm kinda excited to see this thing driving
Yeah, it's either a 2860 or 2871 equivalent (don't remember), journal bearing ebay special. I think I posted the wheel specs in the beginning, if not I can check and post them. I think it's similar to how a Garrett GT2871 should spool, minus probably 500-750 RPMs for ebay journal bearing awesomeness.

And taco manifold too, but I did port it a bit to help it flow a little better.

Quote:
Originally Posted by Leafy View Post
He's also on only the wastegate, even an MBC would help. If you're going to put just 1 MBC in this car it should be the front turbo.
So I'm not against that, but how would I plumb it in?

The front turbo I'm using both ports. Bottom to post-intercooler pipe, top to turbo inlet. Just hook an MBC right to the bottom port? I can't do it on the top port, as that needs to be referenced to the turbo inlet.

Quote:
Originally Posted by hornetball View Post
Amazing. Really.

So, what's next?
Thanks. This went together fairly quickly, and I made a lot of custom stuff for it too. And kind of designed as I went too....

First step is turn up the boost. Then figure out how big of a magnaflow I can fit in the back and order, and decide what I'm going to do for a catalytic converter. And fix any problems that pop up. And figure out a cheap way to MS3 PWM my oil pump with RPM so that it's quiet at low speed/highway cruise.
patsmx5 is offline   Reply With Quote
Old 02-15-2016, 10:43 PM   #284
Elite Member
Thread Starter
iTrader: (15)
 
patsmx5's Avatar
 
Join Date: Aug 2007
Location: Houston, TX
Posts: 7,953
Total Cats: 127
Default

Quote:
Originally Posted by fivehundredton View Post
That's a hell of a project! MacGyver ain't got nothin' on you.
Thanks man! I can't wait to get it all dialed in.

Here's a pic of the engine bay as of now. Not pretty but will clean it up once everything is dialed in and working correctly.

Attached Thumbnails
Pat's Ebay Turbo Compound Boost Build-20160215_182531_zpsohd26jvx.jpg  
patsmx5 is offline   Reply With Quote
Old 02-15-2016, 10:53 PM   #285
Elite Member
iTrader: (1)
 
Leafy's Avatar
 
Join Date: Jun 2012
Location: woosta, ma
Posts: 8,598
Total Cats: 91
Default

I would plum it into the bottom line and have the exhaust that would normally vent to air vent to the turbo inlet, that should keep your ratio. So you have to use a bleed type, unless you can find a blocking type that has a reference port that you can plum into the turbo inlet.
Leafy is offline   Reply With Quote
Old 02-15-2016, 11:10 PM   #286
Elite Member
Thread Starter
iTrader: (15)
 
patsmx5's Avatar
 
Join Date: Aug 2007
Location: Houston, TX
Posts: 7,953
Total Cats: 127
Default

Also relavent question, what's a used set of ID 1000's worth? Considering buying the 2,000s, but they're like almost 4 figures....
patsmx5 is offline   Reply With Quote
Old 02-15-2016, 11:11 PM   #287
Murderator
iTrader: (76)
 
18psi's Avatar
 
Join Date: Apr 2008
Posts: 33,151
Total Cats: 1,990
Default

350
18psi is offline   Reply With Quote
Old 02-15-2016, 11:12 PM   #288
SadFab Sales Lady
iTrader: (5)
 
aidandj's Avatar
 
Join Date: Apr 2014
Location: Beaverton, USA
Posts: 14,795
Total Cats: 931
Default

Quote:
Originally Posted by patsmx5 View Post
Also relavent question, what's a used set of ID 1000's worth? Considering buying the 2,000s, but they're like almost 4 figures....
I heard they're only worth like $20. I'll be a good guy and give you $40 for em.

I would do the 1700's. They are significantly better injector tech.
aidandj is offline   Reply With Quote
Old 02-15-2016, 11:48 PM   #289
Boosting since 1984
iTrader: (1)
 
stefanst's Avatar
 
Join Date: Sep 2011
Location: Levittown
Posts: 993
Total Cats: 38
Default

Slow spool on "small" turbo: It's not seeing as much pressure differential on the turbine as it usually would since the big turbo adds a restriction in the exhaust. So it will spool more slowly.
stefanst is online now   Reply With Quote
Old 02-15-2016, 11:50 PM   #290
SadFab Sales Lady
iTrader: (5)
 
aidandj's Avatar
 
Join Date: Apr 2014
Location: Beaverton, USA
Posts: 14,795
Total Cats: 931
Default

Needs an electric cutout after the first turbo that closes when you hit 4krpm. Low end spool then close it and spool the big one.

Keep it stupid simple
aidandj is offline   Reply With Quote
Old 02-16-2016, 12:09 AM   #291
Elite Member
iTrader: (2)
 
Mobius's Avatar
 
Join Date: May 2008
Location: Portland, Oregon
Posts: 2,778
Total Cats: 205
Default

Quote:
Originally Posted by aidandj View Post
Needs an electric cutout after the first turbo that closes when you hit 4krpm. Low end spool then close it and spool the big one.

Keep it stupid simple

Or base the cutout on boost.
Mobius is offline   Reply With Quote
Old 02-16-2016, 12:11 AM   #292
Boosting since 1984
iTrader: (1)
 
stefanst's Avatar
 
Join Date: Sep 2011
Location: Levittown
Posts: 993
Total Cats: 38
Default

Quote:
Originally Posted by Mobius View Post
Or base the cutout on boost.
Using something like a diaphragm => WG actuator?
stefanst is online now   Reply With Quote
Old 02-16-2016, 12:12 AM   #293
Murderator
iTrader: (76)
 
18psi's Avatar
 
Join Date: Apr 2008
Posts: 33,151
Total Cats: 1,990
Default

You guys are overthinking it.
direct port 100 shot will help the 1st turbo spool.
then fuel injection in the midpipe will help the 2nd turbo spool.
18psi is offline   Reply With Quote
Old 02-16-2016, 12:16 AM   #294
SadFab Sales Lady
iTrader: (5)
 
aidandj's Avatar
 
Join Date: Apr 2014
Location: Beaverton, USA
Posts: 14,795
Total Cats: 931
Default

Quote:
Originally Posted by stefanst View Post
Using something like a diaphragm => WG actuator?
English racing mkes something like that. It's just a wastegate cutout
aidandj is offline   Reply With Quote
Old 02-16-2016, 12:26 AM   #295
Senior Member
iTrader: (2)
 
Join Date: Dec 2011
Posts: 1,252
Total Cats: 103
Default

Quote:
Originally Posted by patsmx5 View Post
Also relavent question, what's a used set of ID 1000's worth? Considering buying the 2,000s, but they're like almost 4 figures....
In for a custom dual injector intake next, for the sake of simplicity (and cost savings).
good2go is offline   Reply With Quote
Old 02-16-2016, 12:28 AM   #296
SadFab Sales Lady
iTrader: (5)
 
aidandj's Avatar
 
Join Date: Apr 2014
Location: Beaverton, USA
Posts: 14,795
Total Cats: 931
Default

Quote:
Originally Posted by good2go View Post
In for a custom dual injector intake next, for the sake of simplicity (and cost saving).
"Savings"
aidandj is offline   Reply With Quote
Old 02-16-2016, 12:35 AM   #297
Murderator
iTrader: (76)
 
18psi's Avatar
 
Join Date: Apr 2008
Posts: 33,151
Total Cats: 1,990
Default

he shouldn't need injectors until he's well over 400.
But I won't deviate from the "KICS" method
18psi is offline   Reply With Quote
Old 02-16-2016, 12:35 AM   #298
Senior Member
iTrader: (2)
 
Join Date: Dec 2011
Posts: 1,252
Total Cats: 103
Default

Quote:
Originally Posted by aidandj View Post
"Savings"
There! (ninja edit) Happy?
good2go is offline   Reply With Quote
Old 02-16-2016, 12:41 AM   #299
Elite Member
Thread Starter
iTrader: (15)
 
patsmx5's Avatar
 
Join Date: Aug 2007
Location: Houston, TX
Posts: 7,953
Total Cats: 127
Default

Quote:
Originally Posted by stefanst View Post
Slow spool on "small" turbo: It's not seeing as much pressure differential on the turbine as it usually would since the big turbo adds a restriction in the exhaust. So it will spool more slowly.
That's true, and might be the main thing. That's part of why I did 3" all the way back too, to help it as much as possible. For sure the small turbo would spool better without the one in the back restricting it.

From a control standpoint this setup is dirt simple. Two turbos, two wastegates. That's it. About to add an air pressure regulator to the rear wastegate's top port so I can adjust the pressure on that one up. Again, dirt simple stuff that just works. No tuning PID, no electronic anything to mess with. Simple and works, I ran this same one on the GT32 setup and it worked perfect, so I expect it to work here too.

Also found a small exhaust leak upstream of the big turbo, missed about 3/8" of welding on a spot, gonna fix that real quick so might spool that guy a bit better....

I'm planning to turn up the boost on the big turbo until I run out of fuel, then figure out how to get more fuel to it.
patsmx5 is offline   Reply With Quote
Old 02-16-2016, 12:42 AM   #300
Elite Member
Thread Starter
iTrader: (15)
 
patsmx5's Avatar
 
Join Date: Aug 2007
Location: Houston, TX
Posts: 7,953
Total Cats: 127
Default

Quote:
Originally Posted by 18psi View Post
he shouldn't need injectors until he's well over 400.
Then I'm gonna need injectors.
patsmx5 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Garrett BB CHRA pressure differential from loose V-Band housing cause oil leak Landrew Engine Performance 13 02-15-2016 05:12 PM
Whipple Virtual Dyno Results patsmx5 Supercharger Discussion 68 02-08-2016 06:44 PM
Help with my noise rear 90 Turbo Suspension, Brakes, Drivetrain 5 01-14-2016 09:49 PM
Turbo Miata & ODB2 eurojulien DIY Turbo Discussion 10 01-13-2016 09:59 AM
Cost Effective Upgrades?? andyvo DIY Turbo Discussion 23 01-06-2016 08:27 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 On
Pingbacks are On
Refbacks are On



All times are GMT -4. The time now is 10:08 AM.