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

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Old 02-03-2012, 11:54 AM   #41
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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.
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Old 02-04-2012, 01:28 AM   #42
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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.

http://i165.photobucket.com/albums/u...7/Miata/56.jpg
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Old 02-04-2012, 11:47 AM   #43
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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.
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