My chinacharger project - 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 08-10-2010, 02:41 PM   #1
Newb
Thread Starter
 
Join Date: Jan 2010
Location: Majorca, Spain
Posts: 37
Total Cats: 0
Default My chinacharger project

Ok gentelmens, I bought a Godspeed gt25 (to replace a M45 JRSC) that has a oil floating bearings. Must I put a restrictor in the feed line or this is only for the ball bearing units?

Another question is that while both, the turbo and the manifold had a T25 flange, the hole in the turbo is slightly smaller than the one in the manifold, do you think is a good idea to do some gasket matching porting here in order to improve the spool?

Thanx,
Ben.
miatasc is offline   Reply With Quote
Old 08-10-2010, 07:42 PM   #2
Boost Pope
iTrader: (8)
 
Joe Perez's Avatar
 
Join Date: Sep 2005
Location: Delicious and Moist.
Posts: 26,327
Total Cats: 1,926
Default

Posts deleted. No newb bashing on this one, ok? He's asking intelligent questions using proper grammar and punctuation, and has obviously done some homework.

You probably do not need an oil restrictor. If you find that you are pumping oil past the shaft seals then I was wrong.


I can't say I've ever heard of anybody port-matching the turbine to the manifold, but then I don't think I've ever seen anybody observe this particular problem. Couldn't hurt, so long as there's sufficient iron around the area you're cutting into. You don't want to thin the wall too much.
Joe Perez is offline   Reply With Quote
Old 08-10-2010, 07:47 PM   #3
Elite Member
iTrader: (8)
 
Join Date: Aug 2007
Location: Bellingham, Wa
Posts: 2,732
Total Cats: 3
Default

I do not have a restrictor on my T25 but its a garrett so who knows. I think you're fine though without one. Ball Bearing turbos certainly do need a restrictor.

I haven't had that problem with any of the garrett turbos i've built manifolds for. This is an interesting observation. I think people with chinachargers might want to take a look and see if they've got this same issue. Port match that sucker for sure and please post before/after pics if you can.
wayne_curr is offline   Reply With Quote
Old 08-10-2010, 09:23 PM   #4
Elite Member
 
Join Date: Feb 2008
Location: Victoria, BC
Posts: 2,322
Total Cats: 12
Default

I'm running the Godspeed GT28R turbo. I have a -4an line coming off an oil sandwich plate with no restrictori. No problems at all. I also have a big drain though, -10AN to a welded -10AN bung on my oil pan.

I ran the same setup on a Garrett T25 with no issues as well.
dustinb is offline   Reply With Quote
Old 08-10-2010, 09:30 PM   #5
Senior Member
iTrader: (1)
 
Join Date: Oct 2008
Location: Trailer County
Posts: 530
Total Cats: -9
Default

I got the EBAY branded JDM (LOL) turbocharger T3/T4, have had it for about a year now with a EBAY oil restrictor as well.
mazpr is offline   Reply With Quote
Old 08-10-2010, 10:03 PM   #6
Elite Member
iTrader: (10)
 
Join Date: Oct 2008
Location: Seattle, Wa
Posts: 1,780
Total Cats: 30
Default

Do yourself a favor and run a restrictor. Myself and several other forum members have found that a pop rivet works well. My chinacharger has started blowing just a tad bit of smoke recently due to me not running one from the start.
Jeff_Ciesielski is offline   Reply With Quote
Old 08-11-2010, 12:27 PM   #7
Senior Member
iTrader: (1)
 
Join Date: Oct 2008
Location: Trailer County
Posts: 530
Total Cats: -9
Default

I am currently going through a rebuild after not following forum suggestions.

15 psi with [email protected] cast pistons with an EBAy chinacharger resulted in 3 bent rods, no detonation.

Just make sure you always have fresh oil as you dont want that restrictor to get clogged whatsoever, and the hole is tiny tiny ...

Name:  OFeed2.jpg
Views: 3
Size:  57.4 KB

Name:  OFeed3.jpg
Views: 3
Size:  61.1 KB
mazpr is offline   Reply With Quote
Old 08-11-2010, 12:49 PM   #8
Junior Member
 
Join Date: Mar 2010
Location: Glasgow, Scotland, U.K.
Posts: 114
Total Cats: -12
Default

MAZPR your signature should be "when the boost kicks in its like vtec on steroids!"
i thought oil restrictors were only for ball bearing turbos and journal bearings need alot of oil to suspend the bearing in oil so do without a restrictor.no?
delcbr is offline   Reply With Quote
Old 08-11-2010, 01:09 PM   #9
Junior Member
 
Join Date: Apr 2010
Location: Cleveland, Tn
Posts: 121
Total Cats: -1
Default

Quote:
Originally Posted by Joe Perez View Post
Posts deleted. No newb bashing on this one, ok? He's asking intelligent questions using proper grammar and punctuation, and has obviously done some homework.
Off topic: Thanks.
Rocky64 is offline   Reply With Quote
Old 08-11-2010, 01:29 PM   #10
Boost Pope
iTrader: (8)
 
Joe Perez's Avatar
 
Join Date: Sep 2005
Location: Delicious and Moist.
Posts: 26,327
Total Cats: 1,926
Default

Quote:
Originally Posted by delcbr View Post
i thought oil restrictors were only for ball bearing turbos and journal bearings need alot of oil to suspend the bearing in oil so do without a restrictor.no?
Typically this is true. I'm not sure that it's so much a matter of ball-bearing turbos not being able to withstand as much oil flow as that journal-bearing turbos simply require more flow, and thus we typically do not restrict their inlets. (This is only a hunch, I have no data to support it.)

I would start out with no restricter. If you find that you are having problems with oil being forced past the seals, then you can add one. If not, it's better to run without.
Joe Perez is offline   Reply With Quote
Old 08-11-2010, 02:59 PM   #11
Newb
Thread Starter
 
Join Date: Jan 2010
Location: Majorca, Spain
Posts: 37
Total Cats: 0
Default

Ok Gents, so far, based in your inputs here, I will start without restrictor with AN2 for the oil feed and AN10 for the drain.

Also I'll port the turbine inlet to match the manifold as is a very small amount of offending material to be removed, so this won't jeopardize the structural integrity of the case and the flow will be improved. Tomorrow I'll post some pics so you'll know what I'm talking about.

Thank you very much for your help.

P.D. Attn. Leatherface: sorry for my answer to you. I've seen your V-Intercoler post and I'm very impressed with your talented work. Congrats.

Ben.

Last edited by miatasc; 08-12-2010 at 05:18 PM.
miatasc is offline   Reply With Quote
Old 08-11-2010, 06:20 PM   #12
Senior Member
iTrader: (1)
 
Join Date: Oct 2008
Location: Trailer County
Posts: 530
Total Cats: -9
Default

Agree with all of the above, but keep in mind that you can also drill the fitting (and it even comes with instructions to modify depending on psi application).
mazpr is offline   Reply With Quote
Old 08-11-2010, 06:28 PM   #13
Newb
Thread Starter
 
Join Date: Jan 2010
Location: Majorca, Spain
Posts: 37
Total Cats: 0
Default

Quote:
Originally Posted by mazpr View Post
Agree with all of the above, but keep in mind that you can also drill the fitting (and it even comes with instructions to modify depending on psi application).
Are you talking about oil pressure or boost pressure?
miatasc is offline   Reply With Quote
Old 08-12-2010, 04:23 PM   #14
Newb
Thread Starter
 
Join Date: Jan 2010
Location: Majorca, Spain
Posts: 37
Total Cats: 0
Default

AEM Uego v/s the LC2 wideband ???

Last edited by miatasc; 08-13-2010 at 10:26 AM.
miatasc 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
Auto Engine into Manual Car Wino General Miata Chat 0 09-23-2015 09:35 PM
Well tuned naturally aspirated example project? asmasm MEGAsquirt 21 09-23-2015 11:53 AM
Project DDoS: '99 "Budget" boost build ProjectDDoS Build Threads 1 09-09-2015 02:52 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 04:31 AM.