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Got Boost?

Elfear

Elfear

Diamond Member
"One kid-inhaling turbo please."





Hinson Motorsports built the engine for a C5 to compete in various mile events. It made 1,870hp@27 psi and 2,246hp@34 psi. Wish I lived closer to TX to see it run this weekend. Looks insane.

Dyno Run

Build Thread
 
You can hear it in the dyno run. It does sound like a jet engine. For those curious, it's a 118mm turbo. D:
 
That's great and all, but given smaller turbos spooling up faster reducing turbo lag I'd prefer two smaller turbos. Twin turbo FTMFW!
 
Puts "1000 HP Supras/Lambos/Evos/etc" into perspective...

Then you boost a domestic V8 to 30+ PSI and you get 2000+ HP and break the dyno! :awe:

Anybody ever heard of a 2,246 HP 4 or 6 banger?
 
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Lol, lag spool isn't really a concern for the "street-ability" of a car pushing 1800+ hp. He's not driving it to work in the morning (not regularly anyway).. it's a purpose built car. Stuff like the Texas Mile are where the big boys (with lots of money) go to play with their toys.

http://www.texasmile.net/
 
He needs like 2 small turbos in front of that thing to spool up the big boy 😀.

/stands on gas

Bystander: Woah hear that turbo man nice
Driver: That's not the turbo, this is the turbo

/Continues to stand on gas as smaller turbos finally drive on gigantic MF.

sssssssppppppppppssssshhhhhhhhhhhHHHHHHHHHH!!H!!H!H!H!H!H!H!H!FFUUUCCHHHHH



*boom*
 
Viper GTS said:
Yeah no shit that motor is what, 2.5x what an actual Integra motor is?

Not even remotely a fair comparison.

Viper GTS
Click to expand...

Yeah it is fair. Too many people who think "boost is the replacement for displacement", well this shows what happens when you boost a big displacement domestic and fuel it with race gas also.
 
exdeath said:
Exactly the point.

All else equal, no replacement for displacement.
Click to expand...

Just to be contrary...

Number of cylinders != Displacement

The 5-cylinder in my Volvo has less displacement than the 4-cylinder in my 951. 😉

One could just as easily say that there's no replacement for boost because, all else being equal, the engine with forced induction will have more power. If you hold everything equal except a single variable, there's always technically "no replacement" for that single variable.

ZV
 
True, but I wouldn't want to be anywhere near a 8L 4 cylinder at redline. 😛

Problem with boost though is there is a definitive limit, and that is in the fuel octane and cylinder compression pressure. But you can conceivably add displacement all day long with no limitation except physical engine size. Boost eventually reaches a converging finite limit equally for all engines as a function of fuel knock resistance. At that point the only parameter that can increase, for all intents and purposes, indefinitely, is displacement. Boring and stroking or adding more cylinders to an engine already under 60 PSI boost won't cross the detonation threshold like 1 more psi will. 😉

Given two engines, 10L and 10.1L, with heads with an infinite flow rate, both already at 1000 psi boost and using unicorn blood with a infinite octane rating for fuel, the 10.1L is going to make 1% more power always.
 
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exdeath said:
Yeah it is fair. Too many people who think "boost is the replacement for displacement", well this shows what happens when you boost a big displacement domestic and fuel it with race gas also.
Click to expand...

I think you missed my point. That "Integra" motor is 4.8L, running on Nitro, etc. Unless I'm missing something that Z06 is at the core a stock 427 Z06 motor (albeit with an assload of modifications).

Not even remotely comparable situation. If it were a highly modified 1.8L Integra motor then maybe we'd have a reasonable comparison.

Viper GTS
 
Viper GTS said:
I think you missed my point. That "Integra" motor is 4.8L, running on Nitro, etc. Unless I'm missing something that Z06 is at the core a stock 427 Z06 motor (albeit with an assload of modifications).

Not even remotely comparable situation. If it were a highly modified 1.8L Integra motor then maybe we'd have a reasonable comparison.

Viper GTS
Click to expand...

So run the 427 on nitro at 55 psi like the "Integra" motor and build both rotating assemblies and valve trains out of the same unobtainium for similar RPM.

The 7.0L will put down approximately 45% more power than the 4.8L.

Of course it's not THAT clear cut. In the real world, while a 7L 4 cyl should match a 7L V8/V12/V32/etc in theory, the greater cylinder configuration is going to be better balanced and run higher RPM, better distribution of more but lighter reciprocating masses, more head volume and port area per volume of displacement, etc.

You'd be hard pressed to provide for airflow in the 7L 4 cylinder with the limited material volume of only 4 combustion chambers vs having double (V8) or triple (V12) the head material for the same 7L of volume.

I'm just talking theory and the fundamental origin of the "no replacement for displacement" adage.
 
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