How does a 4 cylinder keep up with a V8??
08-07-2009, 09:43 PM
#41
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yeah, alot of good input on here. Im a noob I actually just sold a 94 integra last week that i did an all motor build on. It was pushing 230ish to the wheels. But I had to push it up to if not past the red line to do anything decent in it. Now I have a 98 t/a and no doubt the ls1 (at low rpm even) slaughters the 4cyl. The f- bodys are just torque monsters that have to put very little effort to beat a 4 cyl. I know the OP was talking about the all wheel drive 4 bangers. well a buddy of mine just spent like 35k or somthing rediculous like that for an Evo VIII. I took him in my 5k dollar t/a. 
dang right More hp for the $.
dang right More hp for the $. 
08-08-2009, 06:43 AM
#43
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yeah, alot of good input on here. Im a noob I actually just sold a 94 integra last week that i did an all motor build on. It was pushing 230ish to the wheels. But I had to push it up to if not past the red line to do anything decent in it. Now I have a 98 t/a and no doubt the ls1 (at low rpm even) slaughters the 4cyl. The f- bodys are just torque monsters that have to put very little effort to beat a 4 cyl. I know the OP was talking about the all wheel drive 4 bangers. well a buddy of mine just spent like 35k or somthing rediculous like that for an Evo VIII. I took him in my 5k dollar t/a. dang right More hp for the $.
dang right More hp for the $.
Originally Posted by someguy
my buddy just payed $40k or something rediculous for a new camaro, and i just wasted him in my $30k sti on a dirt road. What an idiot.
Back to the issue of why 4 bangers are fast. As already said 10 times. Hp/weight ratio. Look at bikes.
08-08-2009, 09:30 AM
#44
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I raced a few bikes, cbr 600...I got em off the line and he didn't catch up. I figured maybe he just quit or something. The trick is get those guys off the line.
08-08-2009, 09:39 AM
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Its pretty simple, Boost. In theory running 8psi of boost adds 50% displacement of the engine by air flow volume. Since a motor is just a big air pump right. Step up to 15psi and you double the displacement of the engine and so on. So a subaru 2.5 @ 8psi is flowing the displacement of a 3.6-3.8 litre. so at 15psi that 2.5 is flowing at the displacement of a 5.0 litre. Put 8psi of boost to a stock ls1 and it will flow the displacement of a 8.0 litre and make 500whp. The ls1 will have a way better power curve too. That is the one thing that Boosted 4cylinders lack, power under the curve!!!
08-08-2009, 09:51 AM
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And I'd take you in my $500 gixxer 750. You are comparing apples and oranges. Its also rediculous to compare a old used car price and a new car price. Your car was probably around $25k new, with inflation would cost $30k new, and you dont have AWD, traction control, stability control, 8 air bags, computer controlled differentials, a warranty, the ***** pull of a new car, and the list goes on. I have an STI, and I surely didnt buy it for the HP number, which is why i also have a turbo'd LS1 going in my pickup truck.
08-09-2009, 03:51 PM
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I dunno about the CBR 600, but my 636 with a couple bolt-ons and gears I could get it to go low 10's there was a guy who could drive better than me who ran on to high 9's. I am not saying it didn't happen but there are alot of bike riders who can't drive.
08-09-2009, 06:47 PM
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Its pretty simple, Boost. In theory running 8psi of boost adds 50% displacement of the engine by air flow volume. Since a motor is just a big air pump right. Step up to 15psi and you double the displacement of the engine and so on. So a subaru 2.5 @ 8psi is flowing the displacement of a 3.6-3.8 litre. so at 15psi that 2.5 is flowing at the displacement of a 5.0 litre. Put 8psi of boost to a stock ls1 and it will flow the displacement of a 8.0 litre and make 500whp. The ls1 will have a way better power curve too. That is the one thing that Boosted 4cylinders lack, power under the curve!!!
Apples to apples an 8 cyl. will always make more power then a 4 cyl. But give the 4 cyl. more rpms or positive displacement then things change. Just simple physics, if you want to know more read up in the subject of thermodynamics and that will help explain a lot
Justin
03-24-2015, 11:44 PM
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Hi,
How come a 4 cylinder car can give a V8 a run for it's money?
Agreed most of the 4 cylinder cars are lighter, AWD with turbo, and they're reving in their upper limits.
Eg 2008 Subaru Impreza WRX STI turbocharged 2.5-liter flat-4 engine puts out 305 horsepower.
Yet my na 5.7 V8 runs the same kind of numbers.
It's just the math doesn't seem to add up.
I know hp / liter is ricer math, so I won't refer to it, but my engin is twice the size, does that mean it's half as effient? It cant be, as mpg / liter is as good.... Hmmm......
Please enlighten me, thanks for the info
How come a 4 cylinder car can give a V8 a run for it's money?
Agreed most of the 4 cylinder cars are lighter, AWD with turbo, and they're reving in their upper limits.
Eg 2008 Subaru Impreza WRX STI turbocharged 2.5-liter flat-4 engine puts out 305 horsepower.
Yet my na 5.7 V8 runs the same kind of numbers.
It's just the math doesn't seem to add up.
I know hp / liter is ricer math, so I won't refer to it, but my engin is twice the size, does that mean it's half as effient? It cant be, as mpg / liter is as good.... Hmmm......
Please enlighten me, thanks for the info
03-25-2015, 01:08 PM
#56
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We'll leave this discussion in 2009, where it began.
This isn't the right section for it anyway.
This isn't the right section for it anyway.
