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Discussion Starter #4
STi List for KC Area

How does this compare performance wise to the stock WRX turbo?

The reason behind the question is I'm trying to figure out how they only get 34 more HP out of the STi which has the different turbo and intercooler. If I had a regular WRX and only got 34 HP out of those upgrades, I'd be pissed!

Does this mean there is even more power to be tuned from the STi engine/turbo/IC combo compared to the stock WRX?
 

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Thats a good question. If I'm not mistaken, the STI also has variable valve timeing and still only 34 more HP. Something's not jiving. It seems like there would be way more tuning potential with the STI. just my .o2$
 

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Q About Limited Run STi

You guys are forgetting that the STi's advantages over the standard WRX are much more than just horsepower (which I think will be more like 50 hp more)...such as better brakes, better suspension...All the other factors add to horsepower in a sense too, because for every tenth of a second that you don't have to brake is another tenth of a second you're ahead of the guy that does; the same goes for cornering too. I can guarantee that if you only add a bigger turbo and intercooler to a standard WRX so that you have the same hp as the STi, but change nothing else, the STi will still win...easily.
 

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i agree totally snowboarder, my point was only HP figures. Theres no doubt the sum of all STI parts makes it better in all areas. I hope it is closer to 50 HP increase, but realistically with the fuel we have in the US 277-280 out of a 2 liter is boarder line with a factory tuned engine. You gotta think emmisions and reliability. My guess is between 260 and 270. Unless they decide to use to 2.2 liter. Which I hope they do.
 

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Grassroots Motorsports

I doubt that they'll make a 2.2 L, but you could always just stroke the engine to that. The reason is that the STi is supposed to pay homage to the WRC car so that means 2.0 L. I'm hoping that there will be a US version 22B but I kinda doubt that too.

Anyway, I first considered getting the RS since all I wanted was the AWD, add some snow tires so I wouldn't need chains. But the fact that I can beat alot of the cars out there is a nice bonus... :wink:
 

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Discussion Starter #9
Don't get me wrong, I know there is more to the STi than power. My point is that those two important areas of upgrade for the STi don't seem to offer much in power. Unless there is some unreal torque curve or that HP number is that high all the way through the power band, I don't see how they wouldn't easily get more power out of that engine.

That led to my question....is the STi severely detuned in factory form? I'd assume this is true given the ECU upgrades Prodrive can make and get 30% more torque.
 

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check out my post regarding the S202.

same engine, from what I can find very minor changes. The biggest changes are ecu upgrade, oil cooler, and some silicone. They got 315hp.

The sti may not be that more powerful than the wrx but I am sure we will see that it is a better base for modification with more untapped potential and less risk (forged pistons, better cams, stronger gearbox, reinforced block). There is more to the STI engine than just a different turbo and intercooler (which incidentally many say is still too small).

probably if you just got the ecu mapped for 99RON (94OCT), it would produce significant power gains with no other modifications - the car has been detuned.....
 

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Part of the reason we are only getting "34 more hp" or 50, or whatever is they cannot use the turbo to its upper limits b/c of the intercooler location. This is speculation, but I would imagine it to be true. Top intercoolers are also nicknames "interwarmers." I would imagine that a FMIC and changed computer parameters would get you to well over 300hp no problem. As far as the S202..although it uses the TMIC it also has the oil cooler which helps out. I'm sure the ecu retards timing quite a bit in less than optimal temperature conditions.
 

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I think he meant the S202 has a significantly upgraded oil cooler from the normal STi. And since the S202 is based on the Spec C, maybe even the Spec C has a different oil cooler than the standard STi.
 

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I can't think of a company that has made a turbocharged car recently that didn't have an oil cooler. In most cases, the oil cools and lubricates the turbo, so it is seeing much more severe duty. A cooler keeps it from breaking down quickly and requiring an oil change every 500 miles.

J.B.
WRXtra
 
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