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Old 10-14-2004, 01:36 PM   #1
speedypete
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Cobb stage 2

Default FXT Cobb stage 2 = STI performance?

Okay I was looking at the numbers over at the cobb website and according to their dyno charts the stage 2 FXT makes 224.3 hp and 264.7 ft. lbs. tourque.

Now the STOCK STI puts down 238 hp and 248 ft.lbs tourque.

Judging by those numbers I would think the stage 2 FXT would pretty much equal the 0-60 times and 1/4 times of the STI. Yes the STI makes 14 more hp but the FXT puts down 17 ft. lbs more of tourque. Add to that the very aggresive gearing in the FXT I would think the Forester is pretty damn close to the STI in acceleration numbers.

Am I way off in thinking that or would that 14 hp advantage the STI has just too much to overcome?

All I know is that my stage 2 FXT pulls like a sob
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Old 10-14-2004, 01:59 PM   #2
WSSBOARD18
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What is the weight difference and i believe that the sti's gearing is pretty aggresive too.
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Old 10-14-2004, 02:20 PM   #3
mbiker97
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Are those dyno numbers from the same dyno?

BTW the FXT = 3225 lbs and the STi = 3298 lbs (per subaru.com)
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Old 10-14-2004, 03:05 PM   #4
Mattr762
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Yes same dyno. I took each dyno and over layed them to compare.



You can see after 4300 RPM the STi makes more power. All the power below 4000 is not really used at the drag strip. Since 1/4 mile racing is done in the range of 4000 to 7000 RPM I would think the STi would still be faster.

The STi has at least a 25whp gain at 6600 RPM.

Last edited by Mattr762; 10-14-2004 at 05:56 PM.
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Old 10-14-2004, 03:26 PM   #5
pezman04wrx
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If you were to go by the numbers ... Yes, you'll probably be looking at the same times ... In all actuallity, maybe even a little better ... You may be down on HP -14, but your up on TQ +17 ... On top of that you're slightly lighter which will only help you ... Add to that, the fact that the gearing on the FXT will probably be a little taller, may allow less shifts (STI's are in fifth in the 1/4, 6spd-- WRX's are just crossing into 4th in the 1/4, 5spd) ... Not sure on specs for an FXT ratio wise, but I'm sure your running a 5spd vs a 6spd and that's gotta help alot ... You should throw that bad boy on a dyno and get some real world numbers ... Did you do any dyno plots before upgrading to get a baseline?
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Old 10-14-2004, 07:10 PM   #6
speedypete
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Stock FXT put down on cobb's dyno 192 hp and 219 tourque to the wheels. Running stage 2 (full turboback and a reflash) there's a +32 hp and +46 tourque to the wheels.

Not sure ratio wise the fxt is but we are well into 4th gear hitting the 1/4.
BTW I think the fxt is geared shorter than the sti.
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Old 10-14-2004, 07:29 PM   #7
DoctorNick
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FXT is a STI killer if the right mods are done...
Check out the forester forums.
Sounds like its only an ECU swap, turbo, uppipe, turbo back exaust and intercooler away from STI powerlevels and even shorter gearing (iirc).
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Old 10-14-2004, 07:34 PM   #8
speedypete
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here are the gear ratios and speeds:

Transmission: 5-speed manual
Final-drive ratio: 4.44:1, limited slip
Gear ... Ratio ... Mph/1000 rpm ... Max. test speed
I ... 3.45 ... 4.9 ... 32 mph (6500 rpm)
II ... 2.06 ... 8.3 ... 54 mph (6500 rpm)
III ... 1.45 ... 11.8 ... 76 mph (6500 rpm)
IV ... 1.09 ... 15.6 ... 102 mph (6500 rpm)
V ... 0.78 ... 21.8 ... 129 mph (5900 rpm)

as you see the fxt is very short geared...I would think shifting into 5th (or close to it) as we hit the 1/4 mile
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Old 10-14-2004, 07:34 PM   #9
V6TurboTA
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Forester might have more peak torque but that doesnt mean its faster.

The WRX makes about 75 more ft-lbs of torque than a Honda S2000... Yet its slower.

Dont believe the hype

~v6
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Old 10-14-2004, 11:45 PM   #10
maestro
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All that is required to convert an FXT motor to STi spec is the STi's turbo,ecu,up-pipe, and IC. Then the motors are identical (aside from the red intake manifold ) More aggressive gearing + fewer shifts + lighter weight + less parasitic drivetrain loss = FXT fastAR than STi

Maestro
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Old 10-15-2004, 12:04 AM   #11
XT6Wagon
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Problem is that the forester ECU is a flaming pile, and I don't think that the accessport does ANYTHING to remove the crippling that Subaru put in to make the EJ255 work with that stupidly small turbo. Just way way too many maps need to be changed to get it to work correctly for a performance setup.

So I'd go for a full featured reflash like the EcuTek, or swap in a 04 STi ecu + proper engine management of some kind.
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Old 11-03-2004, 09:59 PM   #12
4cylpwr
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Quote:
Originally Posted by speedypete
Okay I was looking at the numbers over at the cobb website and according to their dyno charts the stage 2 FXT makes 224.3 hp and 264.7 ft. lbs. tourque.

Now the STOCK STI puts down 238 hp and 248 ft.lbs tourque.

Judging by those numbers I would think the stage 2 FXT would pretty much equal the 0-60 times and 1/4 times of the STI. Yes the STI makes 14 more hp but the FXT puts down 17 ft. lbs more of tourque. Add to that the very aggresive gearing in the FXT I would think the Forester is pretty damn close to the STI in acceleration numbers.

Am I way off in thinking that or would that 14 hp advantage the STI has just too much to overcome?

All I know is that my stage 2 FXT pulls like a sob
my friend's xt with stg2(tbe) accessport pulls on sti's with catback.
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Old 11-04-2004, 11:02 AM   #13
LatentWagen
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in gear is different than from a dig... but i can believe that. in 3rd gear my semi-tuned stg 2 wrx would pull sti's. that is untill the wrex hit 4th and fell flat on its face

-ed
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Old 11-04-2004, 11:46 AM   #14
Abe Froman
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Quote:
Originally Posted by maestro
...More aggressive gearing + fewer shifts...Maestro
Maybe I'm crazy but how can you have more aggressive gearing plus fewer shifts...anyway not passing judgement either way...

The STI gearing is as follows(final drive 3.9):
1--3.636
2--2.375
3--1.761
4--1.346
5--0.971
6--0.756

Road speed wise the STI is shifting about the same place, I know 2nd won't reach 60, 3rd is good for about 75, and 4th is good for about 100. (Keep in mind redline in the STI is 7000)
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Old 11-06-2004, 02:00 PM   #15
4cylpwr
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just like the sti, you have to shift into 5th at the end of the 1/4 mile.
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Old 11-06-2004, 03:49 PM   #16
WinglessSTi
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STI =Teh win
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Old 11-06-2004, 08:26 PM   #17
AudiTTkiller
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Quote:
Originally Posted by V6TurboTA
Forester might have more peak torque but that doesnt mean its faster.

The WRX makes about 75 more ft-lbs of torque than a Honda S2000... Yet its slower.

Dont believe the hype

~v6
since when is the wrx slower
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Old 11-06-2004, 08:54 PM   #18
jaypine
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Quote:
Originally Posted by AudiTTkiller
since when is the wrx slower
Stock, the S2000 has a higher top speed and quicker 1/4 mile time.
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