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Old 04-18-2001, 05:56 PM   #1
Blindeye_03
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Post What does the 01 RS really put out at the crank?

Since it does 10:1 compared to the 98 that does 9.5:1.

Am I correct at all??, If so someone help me out...
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Old 04-18-2001, 10:20 PM   #2
DaveK
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Same max torque and HP, but the torque curve is flatter on the newer engines.
They both put about 95 to the wheels (all 4) or about 115 if you convert to RWD. If you do a search you'll find more info on the subject.
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Old 04-19-2001, 06:41 AM   #3
Blindeye_03
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Well, I can definately feel the engine stop pulling after about 5600 rpms (peak hp). So the only difference is torque?
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Old 04-19-2001, 06:51 AM   #4
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WOT torque really isn't all that different. The 99+ SOHC engine makes a lot more low and midrange PART throttle torque, that was the difference.

To fix your 5600 rpm problem, try a Ganz Flow or Cobb Tuning intake-- DON'T buy one that eliminates the black box on the throttle body unless you don't care about torque below 4000 rpm. (which you should.)

If that still isn't enough, you'll need a turbo or cams to give it more punch. I am happy with the cobb tuning street cams myself.
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Old 04-19-2001, 05:00 PM   #5
Matt Monson
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Question

Colin,
you just contradicted yourself, a Cobb CAI does remove the black box. But then Trey did a bit of research to minimize torque loss and turbulence and maximize air flow. I have noticed zero torque loss on mine(w/stromung cat back) below 4000 rpm. Below 2500 or 3000? yes, 4000 no.
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Old 04-19-2001, 05:38 PM   #6
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colin the peak torque for the DOHC engines was less aswell, 162 lb-ft opposed to 166 lb-ft. also ive heard many many many times that the SOHC engines only have about half the low end torque at WOT than the SOHC's. heard that part of the reason was that the SOHC's had more room for larger valve openings than the DOHC's, dont know if that last statement is true or not thou. also heard that the MY98ís have better top end acceleration that the SOHCís,. also i once say a post by a member who owns one of the newer SOHC engines and a friend of his had a MY98 and when he raced his freind from a stop he always killed him, but when they raced on the highway...vice versa. i know that doesnt mean much..but just thought id throw it in anyway.


also changed for the MY00 RS was the MAF sensor. changed to MAP. and once again ive heard many times that the whole intake was redesigned aswell and that the MY00ís and up are much more free flowing. so with the increased compression ratio and new intake many people claim that the power for the RS went up, but no one really knows by how much or how the curve changed or what. Subaru kept the specs the same, 165hp and 166lb-ft. most poeple who have driven both a MY99 and a MY00 and noticed any difference, have said that it felt like the power dropped off less in the MY00 than in the MY99ís . so maybe the flatter torque curve has something (like someone said) to do with it or maybe thereís more peak hp. i dunno. and i dont think anybody really does for sure. some needs to take like 5 engines from each model year and put that crap on a brake dyno.

o and before the MY00 RS the compression ratio was 9.7:1 not 9.5:1 from what i understand.

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Old 04-19-2001, 06:51 PM   #7
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Quote:
o and before the MY00 RS the compression ratio was 9.7:1 not 9.5:1 from what i understand.
Ok, and I do have a ganzflow...thats how I can 'feel' it stop pulling after the 5.6k mark. But I am still waiting on my amsoil filter to get here, (still using my paper one)...maybe thats why
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Old 04-19-2001, 07:19 PM   #8
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One of the major differences is that the SOHC have roller rockers, compared to the normal wiping pads of the DOHC. the difference is that SOHC can have a much higher liftearlier into the valve opening (hence giving it the abillity to flow more air at low lift (hence-low throttle). The increase in area over the entire lift curve also helps to smoothen the engine at wide open throttle, since it needs a lower net lift than the DOHC to flow the same amount of area (also enhanced by the short stroke nature of the engine - which has a relatively low piston speed and needs a lot of early valve movement to get air ramp speeds up).
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Old 04-20-2001, 01:06 PM   #9
Matt Monson
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Yes Scrappy,
But that is static compression, to my understanding the dynamic compression is 9.7:1. There were a few discussions about these differences last summer. Might check the Archives.
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Old 04-20-2001, 01:08 PM   #10
SubyRacer
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Scrappy,
ummmmmm....yea we know....dont think anyone was debating the compression ratio of the MY00's and up. unless im missing something. o and what does FYI stand for? still havent figured that one out.....

edit-matt snuck his post in before me. now im actaully a little lost...not very familiar with the static/dynamic compression ratio crap....as far as i knew the MY98's had 9.7:1 compression ratio and the MY00-02's had 10:1 compression ratio.....so thats staic or dynamic....? guess ill have to preform a 'search'




[This message has been edited by SubyRacer (edited April 20, 2001).]
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Old 04-20-2001, 01:18 PM   #11
Blindeye_03
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I am starting to get confused on the static compression ratio as well...didnt know that there was more that one ratio of compression...

And FYI = for your information
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Old 04-20-2001, 01:30 PM   #12
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Matt-- dynamic compression ratio is actually what's going on in the combustion chamber as a result of valve timing, rpm, etc. It's horribly complicated, but fortunately there are relatively inexpensive engine builder software suites available that can tell you what's going on.

Stephen gave an accurate number for the static compression ratio for a 00+ 2.5L SOHC. 98-99 are 9.7:1 and use sparkplugs one heat range hotter.
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Old 04-21-2001, 12:54 AM   #13
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FYI folks,

I checked my book the 2000-2001 had 10:1..

for what its worth

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