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Old 10-25-2011, 07:28 PM   #26
SPEEDWARE
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I have been running my stock block 06 STi anywhere from 360-400 hp and everything is good to go. I also religiously maintain my car, and generally baby it with the exception of my spirited drives/bad days. My go to map is the 360/360 one, and my car has never had an issue. Currently sitting at 32k miles, and have been driving it this way for the last 10k.
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Old 10-25-2011, 07:37 PM   #27
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Currently sitting at 348whp and 340torque at 19psi on a Dynapack. It's only been about 5k miles though. I agree with everyone that it's not if it's when will the engine blow. I could go get tuned for E85 but I'm going to work on suspension and start saving for a new engine.
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Old 10-26-2011, 12:41 PM   #28
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theres a thread called 'show me your 20g setups' or something similar. you might find some interesting information there.
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Old 10-26-2011, 03:03 PM   #29
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Been on "350whp" for over 50k on stock internals. No issues other than regular maintenance. I don't beat on the car but I do autocross it. Stay away from highway pulls and your ringlands will be fine.
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Old 10-26-2011, 05:18 PM   #30
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Quote:
Originally Posted by timeXlost View Post
I was at 352 for 40k, and have been at 375 for over 10k...stock internals. Invest in a very good tune.....

But, it's only a matter of time...I agree.
this.
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Old 10-26-2011, 05:57 PM   #31
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I had 370 WHP (Dynojet) for 90K miles, and the internals were all still fine when I pulled the engine. A broken oil pickup did it in.
Your car is my hero.
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Old 10-26-2011, 06:16 PM   #32
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Again, wtq kills car, not whp.
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Old 11-11-2011, 12:46 AM   #33
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Have an '09 STI Hatch w/Perrin intake & D-pipe, Magnaflow exhaust and Stage 2 tune. Have ran it for over 1.5 yrs and 30,000 mi with regular preventative maintenance and no problems whatsoever. But you never know...
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Old 11-11-2011, 01:23 AM   #34
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I put in an ATP 3076 about two years and 20k miles ago. So far so good.

It did 377whp a couple months ago while detuned to cope with what I later realized was a failing fuel pump. I forgot the dyno brand but I'm told it reads like a Dynojet. Got my pump replaced, AFRs back on track, and cooler weather () so I'm hoping maybe 400whp next time.
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Old 11-12-2011, 12:58 PM   #35
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350+ WHP reliable... easy, it's called a Mustang. I love Subaru's, but the next time I want a "performance" car it wont be from the 5 star.
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Old 11-13-2011, 10:55 PM   #36
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The subaru stock block is essentially the same between the WRX and STI. Boost should be kept below 20 psi on stock pistons for best longevity. With forged pistons boost should be kept below 25 psi for the longevity of the cylinder wall. The ringlands are the weakest point of the stock block, and when you're up to 350 wheel, any knock event will start causing serious problems. Can it be done? Sure, but not for long. A safe tune will help you greatly, but don't hold out too much hope.

The transmission is going to be perfectly fine. Only thing you really have to worry about are the pistons.
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Old 11-16-2011, 07:28 PM   #37
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LOL I love these threads. 350whp is nothing if the car is tuned properly. BTW, these "canned tunes" that the bulk of this community use are a starting point at best. There's still too much timing in them and if you try to datalog commanded AF ratio vs. what's actually coming out of your tailpipe you'll ***** your pants, especially in the 2500-3800rpm range when boost starts to roll in.

I have an 09', I have an AMS 750R kit on it (precision 5857), coolingmist, 1000cc injectors, one of those aeromotive 340s and lots of other goodies but the longblock is untouched. I run 25-28psi daily and I run the piss out it. Highway WOT runs to redline and all. FFS and LC are enabled and I use them regularly. It's been like that for close to 7000km now and not a hitch with the stock long block and I'd bet my next paycheck that it makes a good bit more than 350whp... Maybe I have a good one, I dunno but fact of the matter is it sees quite a bit of power very regularly and has been like a swiss watch. Best DD I've ever had aside from the fuel economy lol.
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Old 11-16-2011, 08:05 PM   #38
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Quote:
Originally Posted by NMccann99 View Post
LOL I love these threads. 350whp is nothing if the car is tuned properly. BTW, these "canned tunes" that the bulk of this community use are a starting point at best. There's still too much timing in them and if you try to datalog commanded AF ratio vs. what's actually coming out of your tailpipe you'll ***** your pants, especially in the 2500-3800rpm range when boost starts to roll in.

I have an 09', I have an AMS 750R kit on it (precision 5857), coolingmist, 1000cc injectors, one of those aeromotive 340s and lots of other goodies but the longblock is untouched. I run 25-28psi daily and I run the piss out it. Highway WOT runs to redline and all. FFS and LC are enabled and I use them regularly. It's been like that for close to 7000km now and not a hitch with the stock long block and I'd bet my next paycheck that it makes a good bit more than 350whp... Maybe I have a good one, I dunno but fact of the matter is it sees quite a bit of power very regularly and has been like a swiss watch. Best DD I've ever had aside from the fuel economy lol.
Yes, and i hope you have plans for a new motor. That is not sustainable. Doesn't matter how safe the tune is, the ringlands will not last long.
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Old 11-16-2011, 08:27 PM   #39
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I haven't seen a couple thing mentioned

1.) Knock kills engines not boost / power. If you knock at a higher wtq, the consequences will be worse. You have less chance of getting away with it. Get a good tune.

2.) Timing increases cylinder pressure. If you're running 350whp with a 35r with low timing and a ewg, you'll be doing much better than a 350whp on some internally gated stock location unit that's running 5 deg more to make the same power
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Old 11-16-2011, 08:54 PM   #40
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our pistons are complete **** compared to the 4G63, our head flow is **** compared to the 4g63, our rods are about the same as the 4g63, our drivetrain is better than the 4g63, our rod ratio isnt as good as the 4g63, and our block is semi closed compared to the 4g63 which is why it can take higher boost levels. both cars/engines have tradeoffs i can go into specific detial about but i wont but they are about equal IMO. where money dosnt need to spent on an evo it does need to be spent on a subaru and vice versa.


subarus break because of cheap and stupid owners, NOT because they are un reliable.


a ROTATED GT3076 on low boost on a stock motor making 350-420WHP is going to be more reliable than a STOCK LOCATION 18g or 20g making the same power. of course on a conservative tune.
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Old 11-16-2011, 09:17 PM   #41
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So what about running e85 to make it to 350whp on a stock location turbo? Would you consider that safer since there is less chance of knock events (with a good tune that is).
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Old 11-16-2011, 09:31 PM   #42
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As of now my 07 sti is at 400whp, 21 psi tuned on a dynopack. I currently have a gt30r and supporting mods. All internals are stock and it's been on the tune for 4+ years. I still have plans in the spring to rebuild the block because I'm paranoid. No problems so far.
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Old 11-16-2011, 09:46 PM   #43
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Quote:
Originally Posted by NJsubbeye View Post
As of now my 07 sti is at 400whp, 21 psi tuned on a dynopack. I currently have a gt30r and supporting mods. All internals are stock and it's been on the tune for 4+ years. I still have plans in the spring to rebuild the block because I'm paranoid. No problems so far.
Please do a compression test first. Stock blocks are a lot more reliable than you think when not abused with a good tune.
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Old 11-16-2011, 09:49 PM   #44
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Thanks, I was going to soon. I went to do it myself but it just looked like a pita to get to the spark plugs and everything. Had a shop in town willing to help me out for $50. Might just take them up on that offer next week.
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Old 11-16-2011, 11:30 PM   #45
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I used to ask people with blow motors if they had logs showing that the motor was knocking or not. I got tired of it because nobody ever did. Everybody just trusts their tuner. Sometimes that works, sometimes not.

If you're not logging, you don't know if you're knocking. If you don't know if you're knocking, you don't know how long your motor is going to last. That goes for any power level, from bone stock to 400+.

I think it's a mistake to blame the motor for blowing up when so few people (like, damn near none) actually know how much their motors were knocking before they blew up. Everybody knows that bad tunes will kill motors.

I don't mean to say that the motors are bulletproof, but I do think that they have an undeservedly bad reputation. I just think that if you keep an eye on your motor (and by that, I mean make logs and read them) then your odds of blowing the motor go way down.

Like I said, ATP 3076 here, for two years. Maxwell Power did a compression/leakdown test this summer, and pronounced it healthy. It later put down 377whp on their dyno, so it qualifies for this thread.
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Old 11-16-2011, 11:54 PM   #46
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Quote:
Originally Posted by Bad Noodle View Post
I haven't seen a couple thing mentioned

1.) Knock kills engines not boost / power. If you knock at a higher wtq, the consequences will be worse. You have less chance of getting away with it. Get a good tune.

2.) Timing increases cylinder pressure. If you're running 350whp with a 35r with low timing and a ewg, you'll be doing much better than a 350whp on some internally gated stock location unit that's running 5 deg more to make the same power
yep, knock (not the tune, verified logs) killed mine at just over 6k miles. I was at 350 wtq with a rotated 35r. I (and the tuner) didn't want to push the stock block too far past that because of my driving habits. Under wot high rpm it felt like it was pulling timing and falling on its face. Of course, I continued to put 18-20 psi to the factory block in hopes it would blow so I could justify rebuilding it.

air/oil separation is a good idea as well. Oil mixed with fuel in the combustion chamber doesn't do much for avoiding knock. And the factory CCV set up isn't the greatest. Especially for longer high rpm runs.

Personally I say a built short block is worth it. I was amazed at how my broken pistons looked exactly like all the other STi broken pistons on here...

Last edited by apexslider; 11-17-2011 at 12:02 AM.
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Old 11-17-2011, 03:15 AM   #47
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Mine (2011 STi) start to have head gasket failure after 18 kmiles. Stage 1 with 20 PSI. About 10 track days per years. I logged it quite oftenly and I never see it knocking, neither listening knock with detcan. I'm in the process of opening the engine so we will see.
A friend of mine with 2009 STi, stage 1, 25kmiles decided to rebuilt its engine whilst it was running fine with no oil or water consumption (he wanted to put 400+ reliable whp). When he extracted the pistons, he had the surprise to see 2 of them with ringland failure !
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Old 11-17-2011, 11:01 AM   #48
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Quote:
Originally Posted by NoGraffix View Post
So what about running e85 to make it to 350whp on a stock location turbo? Would you consider that safer since there is less chance of knock events (with a good tune that is).
yes, i was going to do this. but i dont want to deal with planning my trips or making so much torque my 5mt goes boom. so id rather keep a couple pails of race gas lying around to toss in with a tank when im going to be beating on her
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Old 11-17-2011, 03:10 PM   #49
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I just turned over 88,000. Ran the last 78,000 modded -- 55k on a VF39 (300/350, 18-14psi, tapered), 23K on my HTA68 (371/400, 20+ psi, no taper).

At about 85k got a #4 cylinder CEL and some blowby. Car still runs fine, but a new block with forged pistons is on order from Maxwell. As has already been said, I knew it would be if, not when after all of these miles.
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Old 11-20-2011, 10:39 PM   #50
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I think there's a grey area between max hp and how much the car is abused (to determine motor life). Not that i have personal experience with those hp numbers (I'm running Cobb stage 2+ supporting mods), but i've talked to enough people running 350+ whp as DD's that haven't had any motor problems to make me believe that you don't have to worry about the motor blowing up, as long as aggressive driving is moderate.. That's just my opinion..
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