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Old 02-14-2003, 12:08 PM   #1
alfriedesq
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Default Does anyone know the red line on the 2.5 US STI motor?

Is it 8,000 like the 2.0 STI or something lower ?

I am having major lanceritis of the brain and need to make a decision soon
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Old 02-14-2003, 12:14 PM   #2
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I think redline is 7K, not 8 like the old STI 2 liter. I expect this engine will be running less boost and may not be engineered for high revs like the old motor. Whether it is safe to rev to 8K I don't know, but I wouldn't assume valve springs will tolerate that for long in the 2.5. There is a lot nobody really knows about this motor, including whether it is as mod friendly as the 2 liter STI.
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Old 02-14-2003, 12:41 PM   #3
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From what ive seen its 7... but thats not to say it cant be reved to 8... Now making power at 8 when your max power is at 6 is a different story.
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Old 02-14-2003, 03:20 PM   #4
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Quote:
Originally posted by totoherbs
From what ive seen its 7... but thats not to say it cant be reved to 8... Now making power at 8 when your max power is at 6 is a different story.
Exactly. The point is, you don't need to spin to 8 grand if your max power is available at 6.
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Old 02-22-2003, 06:27 PM   #5
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Redline is 8000 as per the "intro" on the canadian sti website.
http://www.wrx-sti.ca/

Last edited by martiandl; 02-22-2003 at 07:09 PM.
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Old 02-22-2003, 10:29 PM   #6
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And the EcuTek folks can, most likely, change it to whatever you require.
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Old 02-23-2003, 02:54 AM   #7
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Quote:
Redline is 8000 as per the "intro" on the canadian sti website.
I would not accept the intro movie of a Subaru web site as the definitive statement of the redline.

Glenn
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Old 02-23-2003, 08:35 AM   #8
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Default Actual redline............

At the Baltimore Auto Show, My District sales rep and service manager connected the battery and turned the key just enough to watch the electronic dash(the tach only displays redline with key in the on position or running) sweep around to the redline of
7000 RPM. He also turned the Zenon HID lights on, and played with the adjustable headlight knobs.

Redline is 7000 rpm.....not what I think, not what a website told me,..but what I saw.

Stop and think about it,..the N/a 2.5 fell on its face above 5500 rpm, even though it had a 6400 rpm redline. The 2.5 motor we are getting has a big-ass crank in it,..big cranks DO NOT LIKE TO REV HIGH,.. so they make alot of torque. With variable valve timing we are lucky to even get a 7000 rpm redline.

Any of us who have or had a 2.5 know, the best part of the rev band is from 1500 to 3500,...now imagine 14lbs of boost ciming in taking that feeling to the next level along with the variable valve timing,.........OH YEAH BABY !!!

Subaru gave the US STI taller 5th and 6th gears cause we have ..
A) lower redline and B) tons of midrange torque on the 300/300 STI.

944 turbo guy
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Old 02-23-2003, 10:01 AM   #9
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Quote:
Subaru gave the US STI taller 5th and 6th gears
To give the car better fuel economy.
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Old 02-23-2003, 03:35 PM   #10
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The JDM 5 th and 6th gears were crazy low man - it was very annoying on the highway
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Old 02-23-2003, 10:15 PM   #11
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Default 5th and 6th gears......

Quote:
Originally posted by alfriedesq
The JDM 5 th and 6th gears were crazy low man - it was very annoying on the highway
Gotta' admit havin' that monster torque also means we Americans wont mind the taller 5th and 6th ,..right??
I means it's not like the engine will push a theoretical 6th gear to 187 mph, or even the J-spec 6th gear to 179 mph at 6800 rpms.
I think 400hp US STI should be capable of 170 mph without any cheating,( downhill or backwind).

How about this,..forget the speculation,..We'll find out right?

944 tg
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Old 02-24-2003, 12:55 AM   #12
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944 Tubro Guy. The big crank don't like to rev thought is completely wrong. I know folks that rev their ls-1 well past 7K rpms. My 514ci stroker motor will spin easely to 6.8K rpms (that were I set the rev limiter). The S2000 .1 liter smaller than the USDM STi rev all the way to 9K rpms. And, there are other examples. What is a factor is air flow and design of the over all motor. As long as you have the air flow all that matters from there is the quality of the part used and how they hold up to the stress of high rpms, i.e: valve control, oil flow, vibration and the strenght of the parts used.
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Old 02-24-2003, 01:38 AM   #13
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I think he means Big crank = longer stroke = higher piston speed = more heat = safe redline lower. I could be wrong, but when you compare the EJ20 in the Euro/Jap STi, the 8,000 redline is partly due to the shorted stroke, anyone confirm this?
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Old 02-24-2003, 07:33 AM   #14
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The Redline is 7000, I would think the fuel cut off would be around 7500.
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Old 02-24-2003, 12:35 PM   #15
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Quote:
Originally posted by shoracer
944 Tubro Guy. The big crank don't like to rev thought is completely wrong. I know folks that rev their ls-1 well past 7K rpms. My 514ci stroker motor will spin easely to 6.8K rpms (that were I set the rev limiter). The S2000 .1 liter smaller than the USDM STi rev all the way to 9K rpms. And, there are other examples. What is a factor is air flow and design of the over all motor. As long as you have the air flow all that matters from there is the quality of the part used and how they hold up to the stress of high rpms, i.e: valve control, oil flow, vibration and the strenght of the parts used.

S2000 is a 2.0L.

The 2.5RS fell on it's face because of the way the cam was ground, not because of the large crank. The RS can spin to 7200 before valve float.

[EDIT] I just had to add the dancing monkey.
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Old 02-24-2003, 12:50 PM   #16
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Quote:
Originally posted by GaryS


Exactly. The point is, you don't need to spin to 8 grand if your max power is available at 6.
But you can take advantage of reving to 8G so you land into max power after you shift

I shift my RSX-S at 8300 to keep it in the VTEC x-over.

I'm sure the STi will have the same charactersitics
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Old 02-25-2003, 12:17 AM   #17
m ben
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Quote:
Originally posted by Hanzo
The Redline is 7000, I would think the fuel cut off would be around 7500.
nope. the fuel cutoff is not too far beyond 7k. it's not a terribly hard cut-off, but it's there. not sure the exact rpm, it's hard to focus your eyes at that point.

the car is VERY fast & gets up thru the revs really quickly. so fast that even people with tons of seat time can be caught out by it & bump the limiter.

6,500 rpm is best for launches, but on snow tires, 5-5,500 gives you wheelspin thru almost all of 1st gear, but it's fun.

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Last edited by m ben; 02-26-2003 at 03:48 PM.
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Old 02-25-2003, 01:09 AM   #18
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Sadly the "long stroke" EJ25 has a shorter stroke than things like

The B18 in the Type-R.

Want to tell me now that the EJ25 can't rev???
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Old 02-25-2003, 01:17 AM   #19
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Default big crank theory......

Quote:
Originally posted by shoracer
944 Tubro Guy. The big crank don't like to rev thought is completely wrong. I know folks that rev their ls-1 well past 7K rpms. My 514ci stroker motor will spin easely to 6.8K rpms (that were I set the rev limiter). The S2000 .1 liter smaller than the USDM STi rev all the way to 9K rpms. And, there are other examples. What is a factor is air flow and design of the over all motor. As long as you have the air flow all that matters from there is the quality of the part used and how they hold up to the stress of high rpms, i.e: valve control, oil flow, vibration and the strenght of the parts used.
The point is this,..first the S2000 is a 2.0 liter, second yes the cam in the 2.5 rs was weak,.but ...NO MANURFACTURE IS GONNA MAKE A BIG DISPLACEMENT ENGINE THAT DOESNT HAVE BOTTOM END TORQUE BECAUSE THEY TRIED TO GIVE THE TOP END ALOT OF PULL,...NAME ONE LARGE DISPLACEMENT ENGINE WITH GREAT TOP END POWER( 4 CYLINDER) none,...the 2.5 rs was like the biggest thing out there then Nissan came along and could nt better it,..and has industry questionable power numbers.

So again,..larger displacement equals early hp and torque peaks,..small displacment equals rev off the face of the earth,...
for 2 reasons,..1) to pass emissions and 2) the average Joe isnt really trying to rev to 19,000 rpms just to go get his wife some tampons. H e wants good low end torque and short gears.

So be prepared for the STI to fall off around 6500 and nothin' at 7000 rpm, and without being able to do a manual boost controller we'll all be shiftin' at 6500 and the guys in the Uk will be half way to the store for their wives !!!

944 turbo guy.


Guys i do see your point though, i try to learn something when I come on here, thanks for your imput. 944tg.
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Old 02-25-2003, 01:38 AM   #20
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Me bad, I said S2000 was a 2.4L motor.
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Old 02-25-2003, 02:14 AM   #21
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Default Re: big crank theory......

Quote:
Originally posted by 944 turbo guy
So be prepared for the STI to fall off around 6500 and nothin' at 7000 rpm, and without being able to do a manual boost controller we'll all be shiftin' at 6500 and the guys in the Uk will be half way to the store for their wives !!!
Well, it kind of bangs against the 7000rpm limit, doesn't really fall off at 6500rpm.

I think the 2.5-litre is actually similar to the 2.0-litre as far as power band goes. The new 2.0 Sti is fairly good from 2200rpm or so till 7800rpm, while by all reports the 2.5 should be fairly brutal from about 1500rpm till 7000rpm. While the upper rpm range is a bit lower, the operating range is the same.

Which would also point at the AVCS/camshaft setup being a partial culprit.

Cheers,

Paul Hansen
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