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Old 04-20-2005, 08:54 PM   #1
WRX_02_227
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Default How much power should I expect when tuned with my mods??

I have a 2002 WRX 4EAT and I have the following installed. BPM TT turboback (1 hi-flo cat in midpipe), APS uppipe, Perrin short ram, TurboXS TMIC. A UTEC or ECUtek flash is probably the route I will end up taking.

My "goal" is 300 CRANK horsepower. Is that possible to do on the stock turbo? Changing the turbo is something I do not really want to do and if I could meet my goal with the stock turbo that would be great.

Thanks, Rob
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Old 04-20-2005, 09:45 PM   #2
Capt Crunch
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crank hp is almost meaningless because you can't measure it.

however, if you want to compare your car against other 300 hp cars, such as the sti, you will not be as fast with those mods, even with the tune.
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Old 04-20-2005, 10:10 PM   #3
WRX_02_227
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It really isn't the issue of being "as fast" it's so I can say "I have 300hp" when talking to someone. Most normal everyday people don't know, nor understand WHP and crank HP.

So I would need to make 210 WHP to equal 300 HP at the crank if using a 30% drivetrain loss... is that correct?
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Old 04-20-2005, 11:20 PM   #4
jaxscuby
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that is close to turboxs stage 3.
the cars tuned at the shop are seeing
around 230~240whp..so very close to 300hp
maybe even a tad bit over 300..
the stage 2 cars don't have tmic and
we usually get 210~220whp..
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Old 04-20-2005, 11:20 PM   #5
ebeck
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Aw man. Drivetrain loss depends on the dyno. Some read high some read low. some use 28% some use the correct 38%. Generally up pipe, TBE and good ECU-Tek tune will get you 220-230whp or so. That is right about 300-310 crank hp.
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Old 04-21-2005, 12:45 AM   #6
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You should also consider IC Y hoses, and maybe even an underdrive pulley. Should take you to roughly 300-310 at the crank, more or less, on 93 octane. Vishnu advertises 300 crank horsepower with their stage one kit, which is up-pipe, underdrive pulley, turbo-back exhaust, and EcuTek reflash (stock turbo, intake on the Vishnu setup).

If you are looking for other mods to make you faster, you should think about a TC with a high stall speed.
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Old 04-21-2005, 02:05 AM   #7
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Are there more than one pulley available for WRX to be upgraded with? I've often heard the term "power pulley", "main pulley", "underdrive pulley".... are they the same thing with different name?
On the other hand, on Cobb's website, they claim their pulley's diameter is exactly the same as stock so not to underdrives the accessories.... Well, what bad things happen if I underdrive the accessories? Lost in synchronization with something?
Lastly, what HP/Torque do I expect to gain with lightweight pulley, and it only affects low-end performance, correct?
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Old 04-21-2005, 07:50 AM   #8
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A lighter pulley will improve torque as you spin the tires not the heavy pulley - underdriving accessories can be an issue but in subie case i think the water pump is inside so its not an issue - the alternator and power stering pump on th eother hand....
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Old 04-21-2005, 04:39 PM   #9
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Quote:
Originally Posted by scooterforever
You should also consider IC Y hoses, and maybe even an underdrive pulley. Should take you to roughly 300-310 at the crank, more or less, on 93 octane. Vishnu advertises 300 crank horsepower with their stage one kit, which is up-pipe, underdrive pulley, turbo-back exhaust, and EcuTek reflash (stock turbo, intake on the Vishnu setup).

If you are looking for other mods to make you faster, you should think about a TC with a high stall speed.
The TurboXS TMIC came with a nice Y pipe for the IC so I am good there. I am not comfortable with underdrive pulleys ever since I had one on my Eclipse. It seemed to hurt more then help.

The tranny will be done later. I want to get the engine how I want if first then same up some money for the TC upgrade.

Thanks for the help everyone!!
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Old 04-21-2005, 05:34 PM   #10
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Quote:
Originally Posted by dcwrx2
Are there more than one pulley available for WRX to be upgraded with? I've often heard the term "power pulley", "main pulley", "underdrive pulley".... are they the same thing with different name?
On the other hand, on Cobb's website, they claim their pulley's diameter is exactly the same as stock so not to underdrives the accessories.... Well, what bad things happen if I underdrive the accessories? Lost in synchronization with something?
Lastly, what HP/Torque do I expect to gain with lightweight pulley, and it only affects low-end performance, correct?
Yo. I had the same questions and then spent QT with Unabomber's pulley FAQ. That guy is craaaaaaaazy detailed. You'll find the answers to all of your questions here:

http://forums.nasioc.com/forums/show...hreadid=444518
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Old 04-21-2005, 05:40 PM   #11
dcwrx2
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Thx man, didn't even know pulley has a FAQ section! WTG, Unabomber~~
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