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Old 06-30-2004, 08:55 PM   #1
blackbeast23
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Default Turbo Install Complete

Well, after two weeks of working on the install, the turbo is in! Everything seems to be running alright, except for one small problem. When I let the car idle for about a minute or so, the RPMs drop some, then the engine starts to stumble over itself... and sometimes the dash lights flash for a second (like the engine dies)... then the car goes back up to normal idle (about 500RPM). I am also running a UD pulley. Does anyone know what is causing this, or can anyone think of what I should check?

My stock clutch is also slipping due to too much horsepower. What brand of clutch would you all recommend for a 99' Impreza 2.5?

Thanks a million!
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Old 06-30-2004, 09:10 PM   #2
Derk1127
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try a spec stage 2 clutch, i have it and it works great. id stay away from ACT, had a bad expirence with them.
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Old 06-30-2004, 09:27 PM   #3
cRayZee
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you gotta provide some info about your set up for people to get an idea on what might be goin on.

What kit?
what engine mgmt, etc?
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Old 06-30-2004, 09:53 PM   #4
blackbeast23
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I am running a TSI Superior kit with a Garrett T25BB turbo. Currently, I am not running any engine management and no timing retard. I am also running at the stock 6psi.
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Old 06-30-2004, 10:32 PM   #5
PHATsuby
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to stock is a project too

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um, no timing retard at 6psi, and no fuel management? good luck with the new motor.

not to be rude but its the truth.

Ben
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Old 06-30-2004, 10:40 PM   #6
blackbeast23
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I appreciate your truthfulness... this is the kind of stuff I need to know. I'm not exactly sure on which fuel management system to buy, or which parts I need. Can you help me? Thanks.
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Old 06-30-2004, 11:06 PM   #7
PHATsuby
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to stock is a project too

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at the least i would recommend a RRFPR to increase fuel on boost.

actually the greddy emanage has worked well for lots of people and its only about 400 dollars which is very cheap engine management, and you can do fuel and timing.

Ben

Last edited by PHATsuby; 06-30-2004 at 11:46 PM.
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Old 06-30-2004, 11:37 PM   #8
kastle
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RRFPR, Walbro Fuel Pump, J&S Safeguard to start. Clutches ACT, Spec are good ones.
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Old 07-01-2004, 09:32 AM   #9
crk4
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Damn. I hope you're not driving the car like its a race car or anything!!! I can't believe you got a turbo kit, installed it and are running it now without even the slightest clue that you need to up the FUEL for the added air? That is common sense. Sorry to bash you but its true!

Since I haven't done my turbo yet, all the advice I can give you is TAKE it easy on your car and spend all your time researching what kind of EMS your gonna get. From what I've been researching since DECEMBER of last year, if you got the money...get that Spec clutch and something like a Link or Utec standalone computer. I'm guessing it should cost you approximately +-$2000 for the clutch, installation, utec and tuning.


GOOD LUCK!!!! Keep us posted on all your trials and tribulations!
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Old 07-01-2004, 09:46 AM   #10
blackbeast23
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crk4: This is really an ongoing project car. I did know about the need for the extra fuel, but from the people I had talked to, they were telling me that when running 6psi, I should've been ok. I was going to post a question on this to double check. I just got it fired up the first time yesterday, and I haven't driven it hard, and won't, until I get the proper parts to complete EVERYTHING. I'll be sure to keep you posted. Thanks for showing a newbie the ropes!
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Old 07-01-2004, 10:14 AM   #11
Unsung Boxer
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boost w/o more fuel? ... playing w/ fire buddy...

-Jake
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Old 07-01-2004, 12:22 PM   #12
Mariano
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Quote:
Originally posted by Derk1127
try a spec stage 2 clutch, i have it and it works great. id stay away from ACT, had a bad expirence with them.

WORD!!! But go straight to stage 3. It has the same pressure and feel as the stock one, it slips a bit (no rough engagement) and it holds power over 300hp

saludos,


Mariano
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Old 07-01-2004, 01:20 PM   #13
Hitokiri
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um, sorry to reiterate what people are saying here, but ..

(--- fire comes out of Hito's ears---)
stay OFF BOOST!!!!!! whatever you do. You are operating close to the limit and most likely have gone beyond it already!!!!!!

do you have the ability to lower the boost???? I am running and tuning at 4psi right now and the car is just getting to where I want it to be after many nights of road tuning my emanage!!

whoever told you that you should be fine has no dea what you are dealing with and should not be trusted with your car.

be extremely careful. You engine could blow quite easily at 4psi with a good detonation and you are running 6!


(--- flames die down----)

I have the same car as you and have had to tune extensively in timing to correct the NA timing curve your ecu is running right now. Your cars runs ~12.1 - 12.3 AFRs stock and upwards of 35 degrees of timing at redline!!!!!!!!! - I datalogged mine before I put the turbo on.


be scared!!!! - and if you arn't - you can assure that we are all scared enough for you.

good luck -

a last word of advice - if you see the boost needle go beyond 0.. let off the throttle.


Todd


... poor car
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Old 07-01-2004, 02:20 PM   #14
Aphex
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yeah, 3-4psi with an S-AFC, I would constantly detonate (yeah, I didn't tune it ).

now I have two blown headgaskets, and my car has been on jackstands for a year and a half whilst I upgrade it with some goodies so that it will actually be safe to handle boost.

6psi with no fueling enrichment......... whoever told you that was safe, is indeed a complete moron, stop asking him car questions.
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Old 07-01-2004, 03:27 PM   #15
blackbeast23
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I AM scared... I better not drive this thing until I get the engine management on. ::drives home from work slower than a grandma:: It's a good thing I only need to drive about a mile to get home.

Also, is there a way to tell, audibly, if the engine is running too lean?
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Old 07-01-2004, 03:41 PM   #16
White 2.5rs
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yeah u run over about 2 lbs on a stock fuel system <if the computer even knows to add more fuel which i doubt it does> ur running lean
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Old 07-02-2004, 09:02 AM   #17
dennisla
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Hi
I have just put on a "Exedy hyper clutch" from RalliTek.com
It can handel 350lbs/ft and it work very well.

It's a complete Kit with all you need, for just 380$ + Shiping


Dennis
Denmark
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Old 07-03-2004, 08:37 AM   #18
Mariano
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2005 LGT LTD

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Ok!... After 30 months (2.5 years) with my setup as a daily driver (10-12 psis), being a long time member in NASIOC (#56), owning a MY 99RS (like yours) and after reading and documenting everything and anything on aftermarket forced induction I think I can give you some light in the matter...and correct some incomplete comments in the process.

Here we go: As some of you might recall, Mike Shields (one of the original gurus in Subaru, way long before NASIOC) has an article on his web page on the strengths and weaknesses of our engines (http://www.spdusa.com/engine.htm). You might see that the information in this page dates back to July 1999; most of the info is correct except for the fact that the EJ25 can produce up to 300hp with stock internals which means that the engine can handle moderate levels of boost... I am proof of that.

I've been running between 10 to 12 psis daily for the past 2.5 years. In that time the ONLY problem I've had was a broken/shaved 2nd gear and a worn out clutch. Two and a half years driving my car like if it was stolen, why hasn't my engine blown away??? One word TUNING

Before I started my TURBO project I read and read and read... Every day for a whole year I would do a search on the I-club (now NASIOC) on engine failures; the "what, why and how”. After reading all the disasters on broken engines, detonation, blown seals/gaskets, etc., I figured there had to be a common denominator... and yes there was: timing and fuel management & delivery.

I started by determining which components were necessary for the task. The result:

-GT-28 Ball Bearing turbo
-Spearco TMIC
-Greddy BOV (Type S)
-WRX injectors (420cc)
-Supra TT fuel pump
-Vortech FPR
-Apexi ITC
-Apexi S-AFC
-Apexi AVC-R

…plus other goodies that were not chosen at the beginning of the project although were necessary (UR underdrive pulley, custom 3" catless piping, HKS exhaust/muffler, SPEC Stage 3 clutch, STI Type RA 5sp gearset, etc..)

Tuning, over a period of weeks after the complete install, was necessary to achieve the level of performance and reliability that the car has today. I’m not going to lie to you by saying that tuning the car was a piece of cake… IT WASN’T. Over a couple of months the car was in perfect working order: no stalling, no detonation, no hesitation, no misfire, etc…

Once finished, I took it to a local racing strip and result at 11-12 psis was 12.52 @ 109.8 mph (with a broken 2nd gear). That result puts my car in the 300hp range.

You shouldn’t be afraid just careful. About a month ago, I tested the compression on all 4 cylinders of my car and the result was: PERFECT factory compression; no blown gaskets, no damaged pistons, etc…

I’ve never been so sure if I want to change all my “piggybacks” for a stand-alone programmable ECU, after all my setup has giving me more reliability and fun than most people with RS-Ts. Here in Puerto Rico I’m the ONLY RS-T that hasn’t blown the engine.

If you want to know a little bit more on my setup let me know… I would highly recommend you to get a used Apexi ITC, a Apexi SAFC, Fuel Pump of your choice & WRX or STI injectors….

saludos,


Mariano
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