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Old 04-13-2009, 11:36 AM   #1
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Default wich turbo for my goals and setup

I have been looking for a new turbo seeing how my old one went and im planning on making 300whp to 350whp this summer.

I have a 99 Miata with
323gtx rod
Wiseco pistons
Arp head studs
High volume oil pump
Slight port and polish head
Gutted intake manifold
Cxracing radiator
Fm1 turbo kit intercooled
Act six puck non sprung hub
Link piggy back ecu im going to go standalone once I get a new turbo
Aem wideband
Forge dv


I have been looking at 3 turbo by Garrett the gt2876r the gt3071r and the gt3076r. I have been using this Compressor Flow Map Calculations CFM Calculations it gives you cfm and lb/min .

1.8l
90%
23psi
8000 rpm redline

so let me know what turbo you guys think will work best.
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Old 04-13-2009, 11:39 AM   #2
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This kid again.
Why the **** do you need to rev to 8000rpm on a car that should make gobs of power by 4k?
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Old 04-13-2009, 11:44 AM   #3
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the red line is going to be 7500 but i want a 8k redline for track and lower boost.

and i know every one here hates me but its what ever at this point they help they help they dont they dont
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Old 04-13-2009, 11:48 AM   #4
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Well i make 300 by 7000 with a measly gt2560r. If I were to go bigger I'd only go with a 2871. I love the instant torque I have and wouldn't want to give that up too much.
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Old 04-13-2009, 11:57 AM   #5
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Ya your car is crazy I wish I had your exhaust and intake manifold people tell me that’s why your setup makes the numbers it does im thinking of getting that intake manifold once I get the new turbo and standalone.
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Old 04-13-2009, 12:02 PM   #6
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uuuuuuugh geeez
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Old 04-13-2009, 12:14 PM   #7
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on a dynojet my car would make about 290whp and 280wtq at 4k...you definitely need a bigger turbo.
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Old 04-13-2009, 12:48 PM   #8
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Quote:
Originally Posted by hustler View Post
on a dynojet my car would make about 290whp and 280wtq at 4k...you definitely need a bigger turbo.
What size turbo are you running and what size do you think I should get.
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Old 04-13-2009, 12:56 PM   #9
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o just to add im planning to running 15-17 psi untill i get standalone and then i should be running 20-23psi and then i want to run 25-28psi on race fuel =]

Last edited by 1990miata1.6; 04-13-2009 at 02:50 PM.
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Old 04-13-2009, 01:09 PM   #10
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you're going to need this:

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Old 04-13-2009, 01:49 PM   #11
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idk looks smaller then what i had lol whats that a gt2554
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Old 04-13-2009, 01:54 PM   #12
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Hmmm... going to a bigger turbo will simply put the weak link in your current setup somewhere else. Guys shooting for that kind of power usually start their build over from scratch. If I were you, I'd ditch everything you've got now and start over with an S4/ETD/Absurdflow mani, full 3" turboback, and EXG.

I don't know how many guys make 350whp with an FM1 manifold... not many. You're gonna have a helluva time controlling that amount of boost with IWG. You'd be SOOOO much better off going to a higher flowing setup overall. I don't know what the rating is for the standard FM1 intercooler, but conventional wisdom would think it's too small.
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Old 04-13-2009, 01:57 PM   #13
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wich?!?!?!
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Old 04-13-2009, 01:59 PM   #14
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it's a gt50mmhowitzergodthatthingsucksupsmallbirds71r

On a serious note now that I've got your attention...aren't you're boost level goals just a wee nipply bit high?

Ever notice not too many people here push beyond the 18psi range, even on built motors?

Ever plotted lines on a compressor flow map?

If not, please learn how to do so now. This will prove to you, that nearly regardless of wich turbo we guide you towards, you will not have decent boost before 4500rpm while still able to maintain respectable efficiency at those kind of boost levels near redline -especially at your planned redline-.

I could turn my little turbo up to 20psi if I so wished, but I'm not going to. Why? Because at anything above 10psi it falls flat on it's face in terms of efficiency for volume of air moved above about 5500rpm. This is because it was designed to produced respectable pressure efficiently at lower volumetric flow rates. This means it spools low down, but you can't push it up top. Great for autocrossing, and around town driving. Not a drag racing turbo.

So what are your goals really. Gonna race? Want to slay everything you pull up next to on the highway? Want to build a single minded 1/4mile burner? Want a balanced backroad burner?

A yes to each one of those would lead you in a different direction, and mean you need to talk to (or read post history) for a different group of members here.

Right now I get the impression you're just pulling numbers out of your *** that you think sound cool and will slay on a dyno. While dyno tuning is great, and posting big numbers is great, you have to drive the thing, so think about what you really want, and get back to us.
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Old 04-13-2009, 02:06 PM   #15
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Quote:
Originally Posted by samnavy View Post
Hmmm... going to a bigger turbo will simply put the weak link in your current setup somewhere else. Guys shooting for that kind of power usually start their build over from scratch. If I were you, I'd ditch everything you've got now and start over with an S4/ETD/Absurdflow mani, full 3" turboback, and EXG.

I don't know how many guys make 350whp with an FM1 manifold... not many. You're gonna have a helluva time controlling that amount of boost with IWG. You'd be SOOOO much better off going to a higher flowing setup overall. I don't know what the rating is for the standard FM1 intercooler, but conventional wisdom would think it's too small.


I heir what your saying about the manifold and intercooler and I am going to be going external wastegate but im using this housing to do so with out having to change the manifold http://www.atpturbo.com/Merchant2/me...egory_Code=GTH

Im going to keep the manifold and intercooler I have now and see what I make on them. If I do end up need to change them to make more power I will. Ill be happy with 320whp on pump and what ever I can make on race.
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Old 04-13-2009, 02:20 PM   #16
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Quote:
Originally Posted by gospeed81 View Post
it's a gt50mmhowitzergodthatthingsucksupsmallbirds71r

On a serious note now that I've got your attention...aren't you're boost level goals just a wee nipply bit high?

Ever notice not too many people here push beyond the 18psi range, even on built motors?

Ever plotted lines on a compressor flow map?

If not, please learn how to do so now. This will prove to you, that nearly regardless of wich turbo we guide you towards, you will not have decent boost before 4500rpm while still able to maintain respectable efficiency at those kind of boost levels near redline -especially at your planned redline-.

I could turn my little turbo up to 20psi if I so wished, but I'm not going to. Why? Because at anything above 10psi it falls flat on it's face in terms of efficiency for volume of air moved above about 5500rpm. This is because it was designed to produced respectable pressure efficiently at lower volumetric flow rates. This means it spools low down, but you can't push it up top. Great for autocrossing, and around town driving. Not a drag racing turbo.

So what are your goals really. Gonna race? Want to slay everything you pull up next to on the highway? Want to build a single minded 1/4mile burner? Want a balanced backroad burner?

A yes to each one of those would lead you in a different direction, and mean you need to talk to (or read post history) for a different group of members here.

Right now I get the impression you're just pulling numbers out of your *** that you think sound cool and will slay on a dyno. While dyno tuning is great, and posting big numbers is great, you have to drive the thing, so think about what you really want, and get back to us.

I don’t have any plans for auto crossing mostly a highway monster and a good car to go to the drag track and pull some good number nothing crazy I want to run high 11.s and low to mid 12.s.


I have been reading up on plotting and from what I have found with the CFM calculator. The gt2876r would work for the amount of boost I want to run I think im not sure if I did it wrong but im sure I did it right from what I have read. I know the psi I want is high but I don’t see why people here don’t like to run 20psi I never seen why people don’t.
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Old 04-13-2009, 02:27 PM   #17
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Quote:
Originally Posted by 1990miata1.6 View Post
What size turbo are you running and what size do you think I should get.
Well, I think you can read up here and find the information you need, but considering the rods you put in the car, no bigger than a gt2560.

Quote:
Originally Posted by 1990miata1.6 View Post
o just to add im planning to running 15-17 psi untill i get standalone and then i should be running 20-23psi and then i want to run 25-28psi on race full =]
Allow me to give you some information your father never delivered. You're a dumbfuck, but you can fix it. You don't have to go through life, whoring forums, telling people you have a triple-digit IQ, you can show them. This starts by posting less because no one here wants to read your ****, the same way no girl is ever going to let you climb on top of her so you can prematurely unload a 24-chromosome swimmer if you don't learn to stfu. We have better things to utilize bandwidth on than your worthless posts; girls have better things to do with their time than bang you.

DIAF

p.s. no matter what you buy, it will most likely have a shitty tune and be slower than lower hp cars, virgin.
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Old 04-13-2009, 02:45 PM   #18
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here is what i got for my miata at 20psi 4k to 8k on a gt2876r

Last edited by 1990miata1.6; 05-04-2009 at 02:12 AM.
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Old 04-13-2009, 02:53 PM   #19
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gtx rods=fail
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Old 04-13-2009, 02:56 PM   #20
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I was told that the 323gtx rods were good and plus I got them for 100 bucks off a friend.
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