the hustler effect. smaller A/R on bigger turbo = better spool. - Page 3 - 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 08-22-2009, 09:02 PM   #41
Elite Member
iTrader: (8)
 
Join Date: Sep 2006
Location: Severn, MD
Posts: 1,927
Total Cats: 5
Default

There are plenty of Suby guys running 3071 and 3076s with .64 A/R. You're giving up a bit of top end, but not anything a sane responsible person will see on the street. It's a worthy tradeoff unless you get a hardon posting dyno graphs all day.

Quite a few overlays between the two over on NASIOC that show spool differences and top end.

Frank
fmowry is offline   Reply With Quote
Old 08-22-2009, 09:27 PM   #42
Tour de Franzia
iTrader: (6)
 
hustler's Avatar
 
Join Date: Jun 2006
Location: Republic of Dallas
Posts: 29,114
Total Cats: 351
Default

Quote:
Originally Posted by y8s View Post
you of all people should know how important it is to question the current dogma. that's what I'm doing.



you mean you should have chosen the 2871 .86 at first instead of trying the 2860 .64 for a street car and hoping for better spool with the latter?
I'd love to compare them but I don't really want to spend another $500.
hustler is offline   Reply With Quote
Old 08-22-2009, 10:12 PM   #43
Elite Member
iTrader: (7)
 
Join Date: Jan 2007
Location: Renton Washington
Posts: 1,742
Total Cats: 3
Default

I think anything over 300 whp on a track is worthless unless your running wide *** tires. Atleast in a miata...
SKMetalworks is offline   Reply With Quote
Old 08-23-2009, 12:38 AM   #44
y8s
2 Props,3 Dildos,& 1 Cat
Thread Starter
iTrader: (8)
 
y8s's Avatar
 
Join Date: Jun 2005
Location: Fake Virginia
Posts: 19,037
Total Cats: 406
Default

I might be willing to swap housings if someone had the standard .86, but it's kinda gotta have the wastegate welded shut.

incidentally, what's Pauls 2560 A/R?
y8s is offline   Reply With Quote
Old 08-23-2009, 01:29 AM   #45
Elite Member
iTrader: (12)
 
Join Date: Aug 2006
Location: Central-ish VA
Posts: 4,449
Total Cats: 16
Default

WG doesnt need to be welded shut Matt. You can just tie it shut with some wire.
neogenesis2004 is offline   Reply With Quote
Old 08-23-2009, 01:33 AM   #46
:(
iTrader: (7)
 
Join Date: Jul 2006
Location: nowhere
Posts: 8,281
Total Cats: 2
Default

hell with no boost signal the WG wouldnt open anyway just swap and run the **** y8's
magnamx-5 is offline   Reply With Quote
Old 08-23-2009, 09:08 AM   #47
Elite Member
iTrader: (9)
 
TurboTim's Avatar
 
Join Date: Jun 2006
Location: Chesterfield, NJ
Posts: 6,479
Total Cats: 248
Default

Remember the "GT2871R" also comes in 3 different compressor trims.

Quote:
Originally Posted by hustler View Post
I'd love to compare them but I don't really want to spend another $500.
Anyone with one of my manifolds gets my price on TiAL stuff. At least for the foreseeable future. I did order a seperate .64 v-band turbine as part of the buy in.

EDIT: I really mean you pay retail/lowest allowable price and pay less for the manifold/downpipe...yeah.

Quote:
Originally Posted by y8s View Post
I might be willing to swap housings if someone had the standard .86, but it's kinda gotta have the wastegate welded shut.

incidentally, what's Pauls 2560 A/R?
Paul's 2560 is the standard .64, I think the only way the smaller gt25 turbine comes in.
TurboTim is offline   Reply With Quote
Old 08-23-2009, 09:19 AM   #48
Elite Member
iTrader: (9)
 
TurboTim's Avatar
 
Join Date: Jun 2006
Location: Chesterfield, NJ
Posts: 6,479
Total Cats: 248
Default

Quote:
Originally Posted by gospeed81 View Post
Links to dyno sheet?

Sorry, I looked.
I can't find it anywhere.
TurboTim is offline   Reply With Quote
Old 08-23-2009, 08:20 PM   #49
Tour de Franzia
iTrader: (6)
 
hustler's Avatar
 
Join Date: Jun 2006
Location: Republic of Dallas
Posts: 29,114
Total Cats: 351
Default

Quote:
Originally Posted by sbkcocker499 View Post
I think anything over 300 whp on a track is worthless unless your running wide *** tires. Atleast in a miata...
Wrong
hustler is offline   Reply With Quote
Old 08-23-2009, 08:32 PM   #50
Elite Member
iTrader: (41)
 
Join Date: Jan 2006
Location: Seabrook, TX
Posts: 2,409
Total Cats: 19
Default

Quote:
Originally Posted by y8s View Post
you mean you should have chosen the 2871 .86 at first instead of trying the 2860 .64 for a street car and hoping for better spool with the latter?
What I mean is that since this will be prodominately a track car, I should have gone with the .86 2871. If this was a street car, then I think the .64 2860 would be perfect.
rharris19 is offline   Reply With Quote
Old 08-23-2009, 08:33 PM   #51
Elite Member
iTrader: (41)
 
Join Date: Jan 2006
Location: Seabrook, TX
Posts: 2,409
Total Cats: 19
Default

Quote:
Originally Posted by TurboTim View Post
I can't find it anywhere.
Lemme see if I can find it in my email.
rharris19 is offline   Reply With Quote
Old 08-23-2009, 09:27 PM   #52
Elite Member
iTrader: (15)
 
Join Date: Dec 2007
Location: San Antonio, Texas
Posts: 4,889
Total Cats: 28
Default

Quote:
Originally Posted by rharris19 View Post
What I mean is that since this will be prodominately a track car, I should have gone with the .86 2871. If this was a street car, then I think the .64 2860 would be perfect.
Or get a bit of the best of both, with a 0.64 a/r 2871
ZX-Tex is offline   Reply With Quote
Old 08-24-2009, 02:10 PM   #53
Elite Member
iTrader: (41)
 
Join Date: Jan 2006
Location: Seabrook, TX
Posts: 2,409
Total Cats: 19
Default

rharris19 is offline   Reply With Quote
Old 08-24-2009, 02:58 PM   #54
Tour de Franzia
iTrader: (6)
 
hustler's Avatar
 
Join Date: Jun 2006
Location: Republic of Dallas
Posts: 29,114
Total Cats: 351
Default

Quote:
Originally Posted by ZX-Tex View Post
Or get a bit of the best of both, with a 0.64 a/r 2871
judging from the dyno bleow, you and most others in this thread are wrong. Not **** talking...it just looks like the big turbine housing is prevailing. I lucked out.
hustler is offline   Reply With Quote
Old 08-24-2009, 03:10 PM   #55
Elite Member
iTrader: (15)
 
Join Date: Dec 2007
Location: San Antonio, Texas
Posts: 4,889
Total Cats: 28
Default

At constant boost maybe, but what about flattening the torque curve by raising boost at higher levels? The bigger compressor wheel will keep the discharge air temperatures down (efficiency) and the added boost will help offset the higher flow turbine losses at higher RPMs. I plan on trying this myself. 225 ft*lb or so carried to as high an RPM as possible should be great. 225 ft*lbs @ 7000 RPM = 300 bhp. 225 ft*lbs @ 8000 RPM = 342 BHP (about 300 RWHP). Should be able to do this with a built motor from what I have seen.

There is no right answer here, just a matter of choosing one's compromise.
ZX-Tex is offline   Reply With Quote
Old 08-24-2009, 03:33 PM   #56
Tour de Franzia
iTrader: (6)
 
hustler's Avatar
 
Join Date: Jun 2006
Location: Republic of Dallas
Posts: 29,114
Total Cats: 351
Default

Quote:
Originally Posted by ZX-Tex View Post
At constant boost maybe, but what about flattening the torque curve by raising boost at higher levels? The bigger compressor wheel will keep the discharge air temperatures down (efficiency) and the added boost will help offset the higher flow turbine losses at higher RPMs. I plan on trying this myself. 225 ft*lb or so carried to as high an RPM as possible should be great. 225 ft*lbs @ 7000 RPM = 300 bhp. 225 ft*lbs @ 8000 RPM = 342 BHP (about 300 RWHP). Should be able to do this with a built motor from what I have seen.

There is no right answer here, just a matter of choosing one's compromise.
I'm no engineer, but it looks like the wrong answer is the intake plenum because a few of us are on a wall.
hustler is offline   Reply With Quote
Old 08-24-2009, 04:14 PM   #57
Elite Member
iTrader: (15)
 
Join Date: Dec 2007
Location: San Antonio, Texas
Posts: 4,889
Total Cats: 28
Default

I'm working on the intake right now; I'm removing VICS and opening up the plenum. The top half is done, and I am working on the bottom half now. Not as good as a full-up custom intake with a larger throttle but cheaper and easier.
ZX-Tex is offline   Reply With Quote
Old 08-24-2009, 09:16 PM   #58
Elite Member
iTrader: (7)
 
samnavy's Avatar
 
Join Date: Apr 2006
Location: VIRGINIA BEACH, VA
Posts: 6,020
Total Cats: 175
Default

^I'm in for data on this. I don't think anybody has had a direct before/after dyno plot for gutting the 99-00 manifold.
samnavy is offline   Reply With Quote
Old 08-24-2009, 09:42 PM   #59
Elite Member
iTrader: (15)
 
Join Date: Sep 2007
Location: Incline Village, NV
Posts: 2,073
Total Cats: 5
Default

Quote:
Originally Posted by samnavy View Post
^I'm in for data on this. I don't think anybody has had a direct before/after dyno plot for gutting the 99-00 manifold.
I will most likely be gutting my 99 intake manifold after i hit the dyno for ***** and giggles. Will create a thread if i do.
thesnowboarder is offline   Reply With Quote
Old 08-24-2009, 09:43 PM   #60
Elite Member
iTrader: (41)
 
Join Date: Jan 2006
Location: Seabrook, TX
Posts: 2,409
Total Cats: 19
Default

We may soon. I was going to do the same thing ZX-Tex is doing, but if he is doing it soon then I will wait.

How long do you think it will take? I was going to try to do it within the next few weeks.
rharris19 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 57 07-19-2017 05:11 PM
Expected intake temps on the track? tazswing Race Prep 20 10-03-2015 12:04 PM
Moroso Air Oil Separator Catch Can Aroundcorner Miata parts for sale/trade 2 10-01-2015 04:20 PM
ISO 1.6 turbo cast iron manifold cale saurage DIY Turbo Discussion 16 10-01-2015 12:25 PM


Tags
a/r

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 05:35 AM.