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Old 09-23-2004, 11:49 AM   #1
kevin2.5rs
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Subaru Stars G-force / RS

If a stock wrx has 227 hp, and you were to mod up a RS to about 200-210 hp
will you feel a simular g-force of being pushed back into the seat, as a turbo car will do?
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Old 09-23-2004, 11:52 AM   #2
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I think its torque that pushes you back into the seat.
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Old 09-23-2004, 12:27 PM   #3
kevin2.5rs
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so as hp raises so does torque somewhat.
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Old 09-23-2004, 12:49 PM   #4
Matt Monson
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yes, it is very similar. Now here is your assigment. Look up the stock weights on an RS and a WRX and figure out the power to weight ratio of said cars with the power listed...
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Old 09-23-2004, 01:48 PM   #5
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rs....200hp...215hp?
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Old 09-23-2004, 02:15 PM   #6
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The kick of force comes from the turbocharger boost. If your RS is going to remain NA, you'll never get that kick (of course, an NA RS won't easily reach 200+ either )
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Old 09-23-2004, 02:21 PM   #7
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It will reach 200 hp with a cobb power package 3...unless you're talking about whp...but the wrx doesn't have 227 whp stock, it's bhp.
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Old 09-23-2004, 02:22 PM   #8
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of course the money involved to get it to 200hp is also nothing to sneeze at, hehe
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Old 09-23-2004, 02:36 PM   #9
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because of the low end torque of the RS it will a slighty moded RS will give you as big as a kick in 1st gear. For example I run 2.09 60ft in a my TS moded. At any other speed the wrx will have a greater pull over the RS. the as a almost linear accelaration from 3500 to 5500rpm so you dont feel as much as the WRX since it got an exponential accelaration (because of the turbo) from 4000 to 6000+ rpm.
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Old 09-23-2004, 03:29 PM   #10
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Quote:
Originally Posted by rallyshark
It will reach 200 hp with a cobb power package 3...unless you're talking about whp...but the wrx doesn't have 227 whp stock, it's bhp.
All you really need is Cobb stage II plus cams. That saves you $2500 by not buying the heads. I have 151whp and the dyno to proove. There are a number of us around here in the 200Chp club...
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Old 09-23-2004, 05:08 PM   #11
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I will be in that club eventually. im stage 1 now, but my next upgrade is the brakes, then i will get the headers, and cams.
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Old 09-30-2004, 06:56 PM   #12
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Quote:
Originally Posted by Ice Master
because of the low end torque of the RS it will a slighty moded RS will give you as big as a kick in 1st gear. For example I run 2.09 60ft in a my TS moded. At any other speed the wrx will have a greater pull over the RS. the as a almost linear accelaration from 3500 to 5500rpm so you dont feel as much as the WRX since it got an exponential accelaration (because of the turbo) from 4000 to 6000+ rpm.
"exponential acceleration": The funniest thinga that I have heard in quite a while.

With what is commonly refered to as a "flat" torque curve, you get linear acceleration. THe WRX is certainly not capable of "exponential acceleration", unless you play stupid math games with non-interger exponents less than 2. THen it would only be during boost build phase, which a good portion of that time is spend with a power output of that below the NA 2.5 output. Hardly a "kick" when boost needs to be built before any real acceleration occures.

THe "kick" comes from near instantanious power output from rapidly opening the throttle plates on a supercharged or NA engine.

THe "push" you feel is the acceleration of the vehicle pushing the seat into your back as the inertia of your body tries to stay in one place relative to the car not accelerating. An object at rest tends to stay at rest ect. Weather it is HP or torque doesn't matter. THey are both measurements of the same output from the engine. In fact, if you wanted to be a jack ass, it is neither torque or HP that causes the "push" into your seat. Its the ratio between the mass of the car and the tractive force generated by the tires. THe car which generates more acceleration is going to push you harder into the seat, no matter what the power source, be it electric, IC, turbine, rocket ect.

150 hp on a 600 pound motorcycle/rider is gong to feel like a rocket ship when compared to a 40,000# dump truck with 1,400 ft lbs of torque.

cheeRS,

Greg
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Old 09-30-2004, 10:52 PM   #13
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Nobody mentions the difference in gearing between the 2 cars.......

hmmmmm....

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Old 10-01-2004, 02:14 PM   #14
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THey are different cars.

Whats the point?

You could make them as simular as possible, but then the comparison that the thread is taking, becomes moot. It would not longer be a WRX and an RS it would be hybrid drive trains that we would be comparing.

Though gear ratios would change acceleration.

cheeRS,

Greg
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Old 10-01-2004, 11:14 PM   #15
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My RS was on n2o for a while and it put you back in your seat HARD if used in 2nd or 3rd gear. When I had the nitrous on, I would pull on mild modified WRX's all the way until I shifted into 5th gear.
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Old 10-02-2004, 07:55 AM   #16
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Is there a safe way to use nitrous, w/ out blowing the motor?
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Old 10-02-2004, 11:53 AM   #17
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Quote:
Originally Posted by kevin2.5rs
Is there a safe way to use nitrous, w/ out blowing the motor?


of course there is, but it won't yeild much power. with bigger injectors and a 50-70 shot you should be fine.
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Old 10-02-2004, 03:36 PM   #18
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it should yield decent gains if set up properly.
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Old 10-02-2004, 05:28 PM   #19
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Nitrous can be very safe as long as you set it up right. (Air, Fuel, spark plugs, etc.....) The only bad thing when I was using it was the trip to go re-fill the nitrous bottle. Also it costed me $28.50 plus tax every time I filled it up. That can definently add up to a large chunk of change after a while.
Though, the best thing I noticed about it was when you race someone who's car seems to be very close to your own. Then while you are racing side by side, hit the nitrous and watch the guys face when all the sudden you start pulling hard on him. Its great.
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Old 10-02-2004, 05:34 PM   #20
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My 2.5RS ran a 15.6 when it was stock. Then I did Injen Intake, Borla Headers, Apexi' N1 catback exaust, WRX fuel pump, Weapon-R adjustable fuel pressure regulator, and a 75 shot ZEX Nitrous kit and it ran a 13.8. BIG difference.

Its good to have an air/fuel ratio, Fuel pressure, Nitrous pressure, and oil pressure gauge while running nitrous. All four of those gauges helped me a lot.
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