Any experience with small trim (48) GT2871? - Page 3 - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to   Members

DIY Turbo Discussion greddy on a 1.8? homebrew kit?

LinkBack Thread Tools
Old 02-03-2012, 11:54 AM   #41
Elite Member
iTrader: (2)
Join Date: Jan 2007
Location: Los Angeles, CA
Posts: 8,782
Total Cats: 119

Originally Posted by aaronc7 View Post
325 then 2871 is plenty, no rason to get 3071.

max boost for 2871 around 22-24psi really. after that efficiency starts dropping off
Turns101 ran 28psi on 2871. I ran 30psi on my 3071. He had more power and held boost to redline because he had a tubular manifold. I had a log manifold.

And yes you will probably need to boost 24psi or so.

BTW I recommend a Borg S200SX. MUCH CHEAPER and as good.
Faeflora is offline   Reply With Quote
Old 02-04-2012, 01:28 AM   #42
Senior Member
iTrader: (8)
Join Date: Jun 2010
Location: Navarre, FL
Posts: 1,127
Total Cats: 39

Well, of course you can run more, but then you starting to overspin the turbo and get it out of its efficiency area... IMO if you're planning on running more than 22-24psi, then look for 3071 or something with a lil more compressor flow, so you can do it more efficiently.

2.5 PR = 22psi
2.75 PR = 25.7psi
Looking at it a lil closer then I'd say yeah...about 24psi max is what I would do.

If 325 is your power goal, 2871 can def get you there. Probably closer to 20psi with a typical setup.
aaronc7 is offline   Reply With Quote
Old 02-04-2012, 11:47 AM   #43
Tour de Franzia
iTrader: (6)
hustler's Avatar
Join Date: Jun 2006
Location: Republic of Dallas
Posts: 29,114
Total Cats: 351

Originally Posted by Boost Joose View Post
Another question, since I'm looking into the 2867. How signifigantly different would this turbo spool from the .64 A/R tial housing to the .86 A/R tial housing? Also, what could I expect as far as differences on the top end power?
You may find the GT2860RS with the small housing will choke flow too much. The big housing is the way to go. You can make 16psi at 4500rpm on a log manifold with good tuning, that is about 255wtq on a mustang at 4500rpm. The compressor or cams will run out of steam above 6500rpm. Something runs out of steam up there, I'm not sure what.

The GT2860RS was made for the big housing, use it. I think it works very well on my car, which delivers power like no other turbo Miata I've driven, just don't expect more than 300whp on a Mustang.
hustler is offline   Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
15x10 - 15x11 6UL @ 949 Racing emilio700 Wheels and Tires 151 06-02-2017 03:36 PM
1994 Spec Miata Race Car SM/SM2/SSM For Sale Quinn Cars for sale/trade 6 10-23-2016 08:58 AM
Need help - Stock Balancer and Fastforward overlay pulleys Frank_and_Beans Supercharger Discussion 13 09-12-2016 09:17 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 05:21 AM.