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Old 04-13-2004, 10:01 PM   #1
Kripski
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Default Will it BLOW UP?!!

Now I nervous...here's the set-up:

MY02 25RS
Ludespeed Stage 3
Exedy Flywheel
ACT clutch
Sti 550's
TMIC
Link+ ECU
4.5psi
Stock everything else...

WILL I EXPLODE?
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Old 04-13-2004, 10:13 PM   #2
IllNastyImpreza
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Default boom

just adding parts doesnt determain if your engine will detonate itsself into oblivion.

but tuning your A/F ratio correctly, adjusting timing and making sure you dont have super high EGT....etc etc....does help make sure it doesnt

but with 4.5 lbs of boost? I wouldnt worry about it. once u get up to 24.5 then u should worry about it
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Old 04-13-2004, 10:14 PM   #3
Andursun0013
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Does the Ludespeed kit come with a fuel pump? its not necessary for only 4.5 psi but with that setup I don't see why you couldn't run a little more, maybe 8 psi or so. But I would get a fuel pump...it can't hurt and they are only like 100 bucks...those 550's are big injectors


Kyle
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Old 04-13-2004, 10:16 PM   #4
Andursun0013
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Default Re: boom

Quote:
Originally posted by IllNastyImpreza
just adding parts doesnt determain if your engine will detonate itsself into oblivion.

but tuning your A/F ratio correctly, adjusting timing and making sure you dont have super high EGT....etc etc....does help make sure it doesnt

but with 4.5 lbs of boost? I wouldnt worry about it. once u get up to 24.5 then u should worry about it
he makes a very good point...its really all boils down to tuning the car. Which with your LINK+ that shouldn't be much of a problem
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Old 04-13-2004, 10:37 PM   #5
ilmaestro
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That is quite a setup for 4.5 psi. I appreciate your not wanting to be boost greedy though. If you really want to stay at 4.5 psi, you most likely wouldn't need the 550 injectors. Just get the Link tuned correctly and you won't explode. The same can be said for running higher levels of boost.

j
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Old 04-13-2004, 11:30 PM   #6
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At 4.5psi I was very happy with the power my setup made.

There has been speculation that the more recent 2.5L NA engines had a more brittle pistons, which could indeed fragment more easily. I've never tested this, nor have I seen any official testing on it, though, so take it with a grain of salt.

And IllNasty has it exactly right... it's not the parts, it is the tune. If you're conservative and not pushing your internals to the limits, your engine will live a long and prosperous life.
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Old 04-14-2004, 01:16 PM   #7
squirrelmasta
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BOOM!!!!!












No, just kidding. i have heard of people running 10 psi on stock everything. I wouldn't recommend it but. Like stated above though. should be safe as long as you're smart. Peace.
-Eli
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Old 04-14-2004, 02:37 PM   #8
Kripski
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Yes, I have a Fuel pump upgrade also.
The kit came with a 6.6 psi spring, but after I spoke with Forced Air Technologies they said running 6.6 on the 2002's 10:1 compresion will be a disaster. First the pistons would go then the tranny. Another guy with the 02 said he blew up his tranny in 2 weeks after installing this kit, now he's on his 3rd tranny! He was at 12psi and tuned properly. How he was driving at the time I don't know. 8Complex, do you know your 0-60 or 1/14 times?
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Old 04-14-2004, 03:24 PM   #9
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With tuning aside, that won't blow up... actually it sounds pretty nice. And it seems like your able to control your boost monkey because its the monkey that blows cars up not the turbo...

But about the tranny's i've always been curious about this issue. i just don't know why people are blowing up thier trannys with 7-8 psi (250 torque if lucky?). think people should revise the driving style if the tranny blows up too often... not the tranny. But i always look at the nut behind the wheel (me).

Now if you ask me how many clutches hehe
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Old 04-14-2004, 07:44 PM   #10
Kripski
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That's the 1st positive news I've heard in a while, thanks. If it blows what would be the smartest next move?

If I read "buy a WRX" I will lose my SH!^.
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Old 04-14-2004, 11:47 PM   #11
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correct me if im wrong.. but doesnt the RS have the same tranny as the WRX with different gearing? if so i would think the tranny should be able to withstand what the WRX's do..
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Old 04-14-2004, 11:51 PM   #12
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Everyting will hold up as long as you tune CORRECTLY and keep the boost low. I fried some pistons at 10psi w/ a forced air tech stage III. I did not have engine management as wonderful as the Link, so if you tune CORRECTLY you should be good to go.. I also blew out my tranny.. whats funny is I was city driving shifting into secon gear at 3000 rpm's when it blew up. hmmmm.. weird.. anyway. don't "rape" shift and drop the clutch and you should be good to go..
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Old 04-15-2004, 12:01 AM   #13
milkman
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(Now I nervous...)

You'll get over it. Your in for 5g's already Take it up to Godspeed have hime tune it for 8psi or more, start blowing up stuff and build your beast.

I'm running just under 10psi and every day I drive it like it's, it's last day. Because you never know when it's your time.
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Old 04-15-2004, 12:07 AM   #14
White 2.5rs
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hella encouraging lol
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Old 04-15-2004, 12:53 AM   #15
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Everyone is missing the main point: IT'S A 2002 2.5 MOTOR! The late generation 2.5 motors are NOTORIOUS for having weak bottom ends. Period. It's been gone over and over and over again and again and again.

That being said... Krip, if you make it a while with your setup, kudos and I'm happy for you. You would be the first to do so (I know there has to be someone else out there that has one that hasn't exploded yet). I was all set to go that route and then I got discouraged by all the blown 2002/2003 motors from turbo/SC setups... That's why I did the ultimate swap.



P.S.: 4.5 psi is probably pushing the envelope with your motor, so I would not increase it if I were you...

Last edited by Kreeger; 04-15-2004 at 11:21 AM.
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Old 04-15-2004, 12:32 PM   #16
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Where is this undeniable proof that 2002 2.5 EJ's bottom end is prone to failure.... as far as i know all EJ series cranks are forged and havn't seen rods thrown with less then 5 psi of boost...

link me the threads that again and again
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Old 04-15-2004, 01:28 PM   #17
Pi7467mp
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The rods and crank are fine.. In fact If the motor is properly tuned they can each handle quite a bit of power. The pistons are the weak point. They get toasted with small amounts off boost. I know from personal experience.
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Old 04-15-2004, 03:13 PM   #18
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weak is a very relative term... i actually don't think the pistons are weak... its the high compression and combined with the boost that makes it a very high strung motor... I don't think weak is the word... its design (design of motor, turbo kit, EMS/electronics. Knowledge is also much more related to cars blowing up then the actual engine. I qualify this statement by the fact that if you know, your EGTs, A/F and all that tuning whiz bang it doesn't matter if you don't know what to do in if; then situations.

I had a RS-T since early 99, I know what those pistons are like... i have some experience too... :P
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Old 04-15-2004, 05:01 PM   #19
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Thanks, mr pimp...

That's actually what I was getting at was the pistons and not the crank and rods. HOK, look up 'new supercharger with pics' and read about their experience with a couple of `02 motors. It's just what Hamfist says about his experiences, not actual pics of the disaster. I have seen it before, but I forget where the pics are. Be my guest and boost a stock `02/`03 motor, but don't say I didn't tell you it would blow.


EDIT: here is the link...
http://forums.nasioc.com/forums/show...t=supercharger

ANOTHER EDIT:

This is straight from HamFist's piehole...

(I don't mean to sound like an ass saying any of this.) Exploding 2002's helped crash the aftermarket turbo biz for Subarus, IMO. If someone can prove me wrong with a turbo'd example of a 2002 or later Subie, then go ahead. As far as I know, it was a piston change in May of 2002. I've just never actually seen a turbo 2002 or 2003 2.5 engine with my own eyes that runs. I'm not gonna argue with anybody about it....it's quite pointless. We're telling you not to do it on 2002's, but if you do it anyway, it's your business. If we know you have a 2002, we won't sell it to you, because we know ahead of time it's a liability issue. I've heard of 6 2002 cars that have exploded under just low boost. One 2002 Legacy at PDM's old shop that blew up twice. 3 2002-Ludespeed equipped cars exploded, a 2002 car Kent tested his previous supercharger kit on, and a few 2002's I've read about here....all were 2002 and later cars that exploded under boost. Check the piston part numbers between a 2001 and 2002...their different! That's my side of the argument, basically. I also read more than I wrench at the moment, so just take that for what it's worth. We wouldn't lie about something like this. What political motivation could it really serve???? We're honestly trying to save you trouble, not battle any ego's on an internet forum....

As a friendly jest, you'll never get me, Larry Ganz, and 8complex to agree on much of anything. But, they have moderator power and more money than I do, so I have to watch what I say . I don't view myself as god, and my word is not golden or infallible. We're all just doing our thing. We don't want to make this difficult.

Think for a sec about someone more profit motivated. Anyone else more profit minded would tell you do it, buy it, then run and hide when things went bad. I'm telling you ahead of time to not do it on those cars....

Last edited by Kreeger; 04-15-2004 at 05:16 PM.
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Old 04-15-2004, 06:02 PM   #20
HOK
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My whole point is that its all relative... you guys with 2002 and higher engines think they are weak because there are 6 or 8 that you know of have blown up... for ever 6 to 8 2002 and over EJ25 blow ups I can tell you 30 (1999) and thats in Canada ALONE. you have to realize we are talking an extremely large variance in sample size here. In 1998 to 1999 there was under 4000 RS units sold. in 2002 and over the "Subie" hype started and every honda guy bought one. i remember the the units went to 10 to 12K in 2002 thats more then double the size of people and more then likely the size of people modding it. Just because you hear it on this board doesn't mean there aren't other people blowing up thier motors somewhere else.

There are many people that won't admit to blowing thier engines up, but many more will point to the machinery before they think to blame themselves first. Do you know how many people were blowing up thier forged pistons built up motors BEFORE they even got into serious power? more then 6 I can tell you. search back about two years into nasion if it still there... I can tell you 3 off the top of my head.

Last edited by HOK; 04-15-2004 at 08:33 PM.
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Old 04-15-2004, 06:11 PM   #21
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btw that link you posted is far from irrefutable proof.... before you can provide proof of your statements then i will not take anything as gospel...

ps.. And DATS RIGHT! I'm a pimp hehehe..
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Old 05-03-2004, 05:46 AM   #22
benjaminetanyahoo
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please keep me informed about this 2002+ RS Link Plus problem and yeah I've got a ej22t hybrid so the bottom end shouldn't be a problem
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