Ordering stainless pipe right now! lol
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premier miata in the nation??? Getting there.
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http://www.turbobygarrett.com/turbob...7_1_comp_e.gif
you suck http://www.perrinperformance.com/sha...548_comp_e.gif Wait...look at those maps...wtf? At 2BAR it looks like the GT2860rs is more efficient. WTF? |
Originally Posted by ThePass
(Post 419488)
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* I must say though, Sav's manifold/turbing housing set up looks quite the business. |
Originally Posted by hustler
(Post 434937)
Wait...look at those maps...wtf? At 2BAR it looks like the GT2860rs is more efficient. WTF?
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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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dope manifold/dp setup, i hope he made a jig so he can make these any time
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Originally Posted by y8s
(Post 434992)
they both look to be around 75% at 30 lb/min... which point were you looking at?
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Originally Posted by tkblazer
(Post 435015)
dope manifold/dp setup, i hope he made a jig so he can make these any time
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then he better run more boost to prove he bought the right turbo.
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2 Attachment(s)
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Nice map. I expect to see at least 325hp at the flywheel at 20psi boost.
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Originally Posted by Spookyfish
(Post 435148)
Nice map. I expect to see at least 325hp at the flywheel at 20psi boost.
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Originally Posted by Savington
(Post 435150)
I expect to see that at 15psi. max.
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 :giggle: |
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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1 Attachment(s)
Originally Posted by Savington
(Post 435153)
You do realize that turbocharged engines routinely eclipse 100% VE, right?
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): |
No offense, but I fucking 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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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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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. |
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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