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Old 07-26-2009, 05:15 PM   #81
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Ordering stainless pipe right now! lol
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Old 07-26-2009, 05:27 PM   #82
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premier miata in the nation??? Getting there.
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Old 07-26-2009, 06:56 PM   #83
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you suck


Wait...look at those maps...wtf? At 2BAR it looks like the GT2860rs is more efficient. WTF?

Last edited by hustler; 07-26-2009 at 07:32 PM.
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Old 07-26-2009, 10:15 PM   #84
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Quote:
Originally Posted by ThePass View Post
Bravo Andrew. Bravo.

Emilio: "damn it, even with my amazing grip Savington is faster than the OGK... I need boost!"
*Emilio installs Rotrex, enter 200+ whp in OGK*
Savington: "Oh I was just getting started..."
*Built motor + GT2871R = Emilio takes his place in Savington's rearview mirror again*
More that just a Rotrex going in

I must say though, Sav's manifold/turbing housing set up looks quite the business.
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Old 07-26-2009, 10:28 PM   #85
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Quote:
Originally Posted by hustler View Post
Wait...look at those maps...wtf? At 2BAR it looks like the GT2860rs is more efficient. WTF?
they both look to be around 75% at 30 lb/min... which point were you looking at?
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Old 07-26-2009, 10:53 PM   #86
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If you are looking at the efficiency at the center efficiency island, or the 'sweet spot', the 2860 is at 77% and the 2781 is at 76%. But if you look over at the right side of the map, the 2871 holds its efficiency longer; looking at 2.25 pressure ratio @ 35 lb/min of flow, the 2871 is at 72% and the 2860 is at 68% (and falling fast). The 2860 is also spinning about 25K RPM faster.
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Old 07-26-2009, 11:15 PM   #87
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dope manifold/dp setup, i hope he made a jig so he can make these any time
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Old 07-26-2009, 11:56 PM   #88
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Quote:
Originally Posted by y8s View Post
they both look to be around 75% at 30 lb/min... which point were you looking at?
duh...sorry, at 25lb/min. Sav and I were comparing at 300whp/15psi.
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Old 07-26-2009, 11:59 PM   #89
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Quote:
Originally Posted by tkblazer View Post
dope manifold/dp setup, i hope he made a jig so he can make these any time
the problem is intercooler piping. I'd have that **** right now if I could find someone to make 2 pipes for me but everyone in Dallas wants $500+. Its crazy how similar they are though.
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Old 07-27-2009, 12:00 AM   #90
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then he better run more boost to prove he bought the right turbo.
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Old 07-27-2009, 04:08 AM   #91
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Wrong map fagglio. You posted the 48-trim map.

yourz:
Name:  739548-1comp_e.jpg
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Size:  43.6 KB

minez:
Name:  472560-15comp_e.jpg
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Size:  44.7 KB
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Old 07-27-2009, 05:42 AM   #92
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Nice map. I expect to see at least 325hp at the flywheel at 20psi boost.
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Old 07-27-2009, 05:55 AM   #93
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Quote:
Originally Posted by Spookyfish View Post
Nice map. I expect to see at least 325hp at the flywheel at 20psi boost.
I expect to see that at 15psi. max.
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Old 07-27-2009, 06:17 AM   #94
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Quote:
Originally Posted by Savington View Post
I expect to see that at 15psi. max.
Care to share some data? I just went through some calculations. For 325hp with 11.5AFR and a BSFC of 0.55lbs/hr you need around 35lb/min flow.

Add a 95F MAT and 7200rpm redline. You'd need 99% volumetric efficiency to produce 325hp at 15psi on 1860cc. A standard 1.6 engine has a 88% VE. A 99 head means it's from 1999, not that it's 99% VE
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Old 07-27-2009, 06:32 AM   #95
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You do realize that turbocharged engines routinely eclipse 100% VE, right? I'm basing my power goals mostly on what Hustler saw in his car. 262 on a Dyno Dynamics on pump gas at 15psi. You said flywheel horses, so factoring in 15% losses, that puts his car at 301.3bhp. I am running a larger turbo and 100 octane.
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Old 07-27-2009, 06:43 AM   #96
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Quote:
Originally Posted by Savington View Post
You do realize that turbocharged engines routinely eclipse 100% VE, right?
Sure, but in that formule, it's about the VE of the engine that is going to be charged, without the turbo that is.

Source:
TurboByGarrett.com - Turbo Tech103

88% VE:
Mazda Miata performance handbook - Google Boeken

If you drop the AFR to 10.8, you'd get there if your head is 95% VE (99 head, valvejob):
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Old 07-27-2009, 08:14 AM   #97
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No offense, but I ******* hate horsepower formulas. Every single one of them is pure, unadulterated bullshit. Paul made 300whp at 14psi on a 2560R. I've seen a guy make 275whp at 14psi on a 2871R, a '94 head, and a fucked bottom end (bolt went through it). Matt makes 257whp at 9.5psi. Can you honestly tell me that the formulas you use can validate all of those cases?
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Old 07-27-2009, 08:38 AM   #98
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I kept thinking about Paul's 300whp on a 2560 while I was punching those numbers. Apparently there are many more variables involved.
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Old 07-27-2009, 08:48 AM   #99
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VE is so hard to approximate. You would think that when you drop compression, for instance, VE would decrease, but a drop in compression will normally ADD torque (and thus power) to a turbo car.

I despise formulas that calculate horsepower for that reason - they are never detailed enough.
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Old 07-27-2009, 08:56 AM   #100
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Paul also did that on a dynojet, you're going to do it on a Mustang. I was on a DD.
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