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Subaru WRX and STI meet at the dyno with interesting results


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#1 aekOne

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Posted 27 February 2014 - 09:03 PM

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Road and Track recently put the 2015 Subaru WRX and the 2015 WRX STI through a battery of dyno tests to find out not only how much difference there is between their two engines, but what kind of differences there are. The WRX gets the company's new FA20 2.0-liter boxer four-cylinder engine with features like a twin-scroll turbocharger, direct injection and variable valve timing on its two cams. The WRX STI stands pat with the older EJ-Series motor, meaning a 2.5-liter boxer four-cylinder with port fuel injection and carryover turbo lag. Subaru pegs the $26,295 WRX at 268 horsepower, 258 pound-feet of torque and an "extremely conservative" 0-60 mile per hour time of 5.4 seconds. The $34,495 STI clocks in at 305 hp and 290 lb-ft with a 0-60 mph time of 5.1 seconds. Ok, fight.

R&T's dyno runs sussed power numbers at the wheel of 223 hp and 245 lb-ft for the WRX, 247 hp and 243 lb-ft for the STI, then went on to demonstrate in numbers what everyone knew: that the WRX consistently puts out more of its torque earlier than the STI and achieves full boost almost three seconds quicker. On the other hand, on the track, the STI was also shown to have a conservative official 0-60 mph time, stopping the timer at 4.8 seconds compared to the WRX's 5.2 seconds.

The mag says it has comprehensive results coming from its "complete battery of tests," but for now, you can scrutinize their dyno charts and let the battle continue about which one you'd rather put your money down for.

*price in USD

This info and more can be found at: http://www.autoblog.com/

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#2 Barbbachello

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Posted 27 February 2014 - 09:23 PM

has an EJ?! U wot m8


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#3 Robert

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Posted 27 February 2014 - 10:26 PM

The ej motor would be easier and cheaper to make better power from, parts already exist.

#4 SAV84C

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Posted 28 February 2014 - 07:49 AM

Hopefully Subaru fix the boost issues and workmanship of the FA20T in the Foz before they release this...

 

The foresters have been having issues at WOT

 

http://ozfoz.com/for...p?f=110&t=42036



#5 Samwise

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Posted 01 March 2014 - 05:13 AM

Aren't the FA engines having trouble with boost though?

 

Or is that just the 86/BRZ owners playing silly buggers?


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#6 SAV84C

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Posted 02 March 2014 - 09:31 AM

Aren't the FA engines having trouble with boost though?
 
Or is that just the 86/BRZ owners playing silly buggers?


The FA in the 86/BRZ is NA from factory so I don't know what your talking about.

The FA in the new XT is the same engine that's going in the wrx...

The XT is running 19psi tapering down to 12psi.

A few of the Ozfoz boys reported going from cruising speed to WOT would cause the car to hesitate really bad then all of a sudden a bang/pop a big cloud of black smoke n accelerate off unexpectedly.

All of them reported this to subaru and none of them could replicate the problem n figure out wat was wrong. They suggested for the time being not to go WOT until further investigation.

So the boys took it into the own hands.

Went searching for the first thing u always do with hesitation problems, boost leaks...

And straight away they found the problem, ..every hose clamp that was on the bov, TMIC, intake n throttle body was loose... So everything was tightened to torque specs n straight away problems were fixed no hesitation no violent unexpected acceleration n big cloud of black smoke...

However this wasn't the end of the problem. Few weeks after tightening the clamps thwy became loose again??? Came down to shitty quality hose clamps.

This has been reported to Subaru Australia n they have since sent out an expert from Japan to come over n have a proper look into the problem coz no one from Subaru Australia knows wat to do about it

#7 Jimbo

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Posted 02 March 2014 - 09:34 AM

Surely the simple and obvious solution is for Subaru to come to the party, initiate a recall and put better hose clamps on??


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#8 SAV84C

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Posted 02 March 2014 - 11:54 AM

I'd say there probably hasn't been enough reports for Subaru or FHI to initiate a recall. Most SJ owners wouldn't be doing any WOT n hard acceleration

#9 TSG

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Posted 04 March 2014 - 06:19 PM

Did not know the STi was sporting the EJ still. I dunno.. the price and performance difference doesn't really make you want the STi these days. I'm not seeing what will be a $20k difference in price.






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