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Old 10-22-2001, 12:45 AM   #1
kaos200
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Arrow DAMN 2.5s sound mean at 7,000 RPM!

especially with 1st gear whine!
so whats the highest anyone has taken their 2.5 without blowing it?
8,000? higher?
I cant imagine what it would be like to have 8,000rpm with headwork and boost!
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Old 10-22-2001, 12:49 AM   #2
Eric SS
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Location: 2013 335i, 2011 G37 coupe
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swap and N20. gone. : (

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Are you talking with stock valve springs? One of our fellow clubbers takes his (albeit a 2.2RS) to 7,600rpm's

Eric
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Old 10-22-2001, 12:55 AM   #3
kaos200
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Quote:
Originally posted by Imprezinator
Are you talking with stock valve springs? One of our fellow clubbers takes his (albeit a 2.2RS) to 7,600rpm's

Eric
yeah what i meant by headwork, cams, springs, retainers, valves, port/polish etc..
who's 2.2 RS would that be?
but still, 2.5 all the way man! Torque is definitely sweet, and I can feel it almost the whole way (starts to taper, still working on the top end fueling and timing parameters)
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Old 10-22-2001, 01:18 AM   #4
Eric SS
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Location: 2013 335i, 2011 G37 coupe
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swap and N20. gone. : (

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Yes 8,000 is do-able. I would rather not mention his name for fear of incrimination

Eric
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Old 10-22-2001, 03:06 AM   #5
8Complex

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Just get going about 60mph and drop it back into second. Now THAT would be an interesting sound.
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Old 10-22-2001, 03:10 AM   #6
Andrew
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kaboom.
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Old 10-22-2001, 04:12 AM   #7
bsquare
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You are beyond the limits of the bottom end at that point. I wouldn't recommend it, especially not frequently or for an extended period. Your bearings will be very dead.


Ben
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Old 10-22-2001, 10:25 AM   #8
kaos200
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Quote:
Originally posted by bsquare
You are beyond the limits of the bottom end at that point. I wouldn't recommend it, especially not frequently or for an extended period. Your bearings will be very dead.


Ben
cough*Built up*cough*
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Old 10-22-2001, 11:20 AM   #9
t.rod
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What have you done to get your 2.5 to 7k? Sounds interesting.
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Old 10-22-2001, 01:12 PM   #10
kaos200
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Quote:
Originally posted by bsquare
You are beyond the limits of the bottom end at that point. I wouldn't recommend it, especially not frequently or for an extended period. Your bearings will be very dead.


Ben
Wait a minute, why do you feel the bearings would be dead after running at 7,000rpm?
thats not alot, so this doesn't make sense to me, please explain
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Old 10-22-2001, 02:09 PM   #11
HndaTch627
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in a balanced and blue printed motor 7k isn't that high.

Jeremy
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Old 10-22-2001, 02:32 PM   #12
mastervic27
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Vishnu Turbo

Thumbs up

EJ25 is stronger than we think.
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Old 10-22-2001, 10:24 PM   #13
zaidallas
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Wink

I'll be finding out what an ej25 on +20 psi and +7000 rpm sounds like very shortly
zaidoun
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Old 10-23-2001, 02:22 AM   #14
kaos200
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Quote:
Originally posted by zaidallas
I'll be finding out what an ej25 on +20 psi and +7000 rpm sounds like very shortly
zaidoun
sweet hopefully the same here
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Old 10-23-2001, 02:37 AM   #15
scotty305
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(sept '01-jan '04)

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Kaos, could you post some sound clips please? I'm dying to hear what a EJ25 sounds like with turbo, and the 7K revving sounds like a lot of fun, too. If you need help with recording methods, and how to get your info on the 'net, just PM me...

-scott-
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Old 10-23-2001, 06:32 PM   #16
Fitz
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EJ25 at 7000rpm and 20+psi?? What size fuel injectors are you running?

Thanks,
Fitz
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Old 10-23-2001, 08:04 PM   #17
kaos200
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guys I took the turbo off to break in the new motor, as soon as my front mount and new wastegate are in, Ill be ready to have some fun
Kian
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Old 10-23-2001, 08:15 PM   #18
bsquare
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Please see the LENGTHY thread on ScoobyNet about bearing failures in EJ engines. An evil combination of weaknesses in the motors often conspire to cause catastriphic failures after driving at high RPMs. Great care should be taken when risking these RPMs.

I plan to tune for power below the factory redline, even with built internals.


Ben
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Old 10-23-2001, 08:28 PM   #19
kaos200
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Quote:
Originally posted by bsquare
Please see the LENGTHY thread on ScoobyNet about bearing failures in EJ engines. An evil combination of weaknesses in the motors often conspire to cause catastriphic failures after driving at high RPMs. Great care should be taken when risking these RPMs.

I plan to tune for power below the factory redline, even with built internals.


Ben
do they know if it is the dynamics of the motor, or the actual bearings themselves?
I have aftermarket bearings not Subaru so I hope it would be the later and that mine hold up
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Old 10-23-2001, 09:25 PM   #20
zaidallas
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Kaos200 : what kinda FMIC are you getting , and how built is the engine going to be , it sounds interesting . I've also been waiting for ever for my front mount to come in .
Actually I'll probably run high rpms only for testing and for the track but not on the street.
fitz; I got 8 injectors : four factory ones and four 550's which will be upgraded soon if the need comes up.
zaidoun
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Old 10-24-2001, 01:53 AM   #21
kaos200
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im getting a custom fmic, not a kit
the engine is built, just a little bit of work left to finish it off, but its running, and nicely at that
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Old 10-24-2001, 02:34 AM   #22
bsquare
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The problem is a combination of poor oil flow layout to some cylinders and detonation at high RPMs due to poor fuel rails or poor tuning. I don't believe afatermarket bearings (I didn't even know they existed for Subarus!) would help much with this. Extreme care in oil change procedure and proper tuning are the best defense if you simply have to rev that high.


Ben
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Old 10-24-2001, 10:36 AM   #23
adeck
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Default 8350 rpms

8350 rpms I reached one day by an accident. Stock motor, I had a borken shifter and it was a pain in the ass to get into gear. At 80mph I went from 3rd-2nd by an accident, my safc recorded it at 8350 rpms.
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Old 10-24-2001, 03:46 PM   #24
kaos200
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Default Re: 8350 rpms

Quote:
Originally posted by adeck
8350 rpms I reached one day by an accident. Stock motor, I had a borken shifter and it was a pain in the ass to get into gear. At 80mph I went from 3rd-2nd by an accident, my safc recorded it at 8350 rpms.
still running strong I presume?
also thatd be a little different than throttling up at that rpm I think
Kian
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Old 10-24-2001, 08:10 PM   #25
bsquare
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There is a vast difference in load between accidentally blipping that high and going WOT to that high and staying there.


Ben
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