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Old 04-11-2004, 02:59 PM   #1
WRC 555
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Impreza GC8 MY99 2.5RS-T 294WHP / 317lbs.ft torque

Well I finally got a chance to dyno tune my car after all this time of boosting. Thanks to Mark from Turbotrix for giving me this opportunity. I spent around 1 hour tuning the Link Plus myself. My setup is as follows:

Ludespeed Stage II (Turbonetics T3/T4)
Link Plus EMS
2.5" turbo back exhaust (no cats)
565cc STi injectors
Warlboro Fuel Pump
ACT Street Clutch Setup
Fidanaza 9lbs. flywheel
STOCK motor
STOCK tranny

I was initially running 12psi and my numbers were 264WHP : 270lbs/ft torque.

After seeing all the Evo's pull unbelievable numbers this weekend with the help of AEM EMS and great tuners, I got a little greedy and upped the boost to 16psi. I wanted to see if the stock heads do indeed suffer with that much boost up top. The results were pretty amazing to me. I was using a TurboXS manual boost controllrer for this setup. I was not pleased with its ability to hold boost up top as you will see from the graph ( too wiggly!) I'm sure the boost controller can be made to hold boost very steady by adjusting the coarse settings but after several tries things were not looking any better and I didnt want to waste too much time with that. The turbo itself is pretty nice though, hits 16psi by 3600RPM, not bad in my book.

Anyways here are the results. I will go on the dyno again soon to fix the small unsteady boost up top. I may switch to a Hallman MBC, I saw great results with them this weekend on the EVO's. If that doesnt work I will go back and use the Link Plus to control it even though its a PITA to get wastegate controls excatly right at those boost levels.


3rd gear pull at 16psi: 294WHP : 317 lbs/ft torque




For comparison, an EVO put out up 353WHP 330 lbs/ft torque with the following setup the same day on the same dyno:

AEM EMS tuned by Jason from AEM and Mark from Turbotrix Racing(both EXPERT tuners)
3" turbo back exhaust (no cats)
272 HKS Cams
HKS cam gears
18-19psi on stock turbo
stock motor
stock tranny/clutch

As for street results, I am speechless, the cars PULLS HARD and its sick fast in 2nd, 3rd AND 4th gear. Its only a matter of time before a rod gives out or even the head gaskets but we'll see. EGTS are safe as well
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Last edited by WRC 555; 10-06-2004 at 10:26 PM.
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Old 04-11-2004, 10:20 PM   #2
Graham
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VERY nice number man!!

I'm quite impressed you did that yourself, and are still on the stock block. I guess that higher comperssion ratio helps quite a bit. If you blow the motor, what are you going to go to? STi block?

Is the turbo a T3/T4 B or E?

Very nice....those are are some of the highest numbers I have seen for a stock N/A 2.5L motor.


Graham
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Old 04-12-2004, 11:33 AM   #3
WRC 555
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Thanks!

Its a T04B. As for a motor, not sure yet. Most likely a built 2.5 or ones offered by i-speed / axis. Def with nice head work and 272 cams.
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Old 04-12-2004, 02:10 PM   #4
Graham
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Get a larger turbo too, less boost you will make more power.



Graham
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Old 04-12-2004, 10:10 PM   #5
WRC 555
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Thats for sure! The GT35 series are looking to be on top of my list so far. The only downside to getting that turbo is that the stock gearing isnt good for a large turbo along with the short redline. An STi 6-speed seems to be the best option for what I'm trying to do which is mostly tracking it (road coarse) and not dragging. I will go to the strip soon though just to get a trap speed, gonna baby 1st, 2nd gear shifts

I'l tell you one thing, the EJ25 motors peak torque looks to be around 3500-4000RPM range and at 16psi it doesnt like more than 3 degs of advance there or else it starts knocking! But in there upper revs it def. likes more advance (more than 10 deg)

Cool thing was I got to meet Adam from Z1 there while I was dynoing and heard the crazy stuff he did with his GC8 and that was with piggy backs! Its crazy how things have evolved so much in the past 5 years
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Old 04-13-2004, 12:57 AM   #6
Graham
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GT35 would work brillianlty on the 2.5L, and make some huge power.

As for raising redline, I just did this on my car. Currently my redline is set at 7000 RPM. I have 2.5L SOHC heads from an RS, with upgraded TWE ti springs and retainers...thats it. No cam or anything of the sort. I am also quite suprised at how well these guys are flowing. I am only running 14 psi through a SC-34 Precision Turbo (T3/T04S), and the car is making very nice power, even up top (although adding just a cam would net about 20 WHP at this point).

The EJ25 is much more inclined to knock in the midrange than it is up top...thats where we really have to watch the knock sensor. What are you using for knock detection? The stock sensor for the Link?

Graham
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Old 04-13-2004, 12:36 PM   #7
WRC 555
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Yeah if I had more time I was gonna keep raising the rev limit and that way I could determine valve float from a crazy loss of power in that range.

As for knock I am using a Knock Link (set to high sensitivity) with a separate sensor and also have the Link Plus controling knock from the stock sensor.

Have you dyno'd yet at 14psi? Your numbers should look jst as nice if not better!

Right now my EGT's are begging for water injection!
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Old 04-13-2004, 12:50 PM   #8
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I'm glad to see that someone else has pushed the envelope. Now post this over at the RS site so everyone will know 6psi is NOT the limit for these motors.
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Old 04-13-2004, 12:53 PM   #9
WRC 555
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haha will do
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Old 04-13-2004, 03:08 PM   #10
Boostup!
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You're only running ~10 deg advance up top? Wow, that's VERY conservative....I guess you have to, 12 psi on a stock RS motor w/o water injection is pretty dangerous. I was running 19-20 deg advance at 6000 rpm, ~14.5 psi, and ~8 deg at peak torque.

Water injection will definitely help with lowering your EGTs and you can run more timing too. FWIW, I tried a few different nozzle sizes and ended up with 2 nozzles, 1mm and 0.8mm.

Toon
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Old 04-13-2004, 04:25 PM   #11
WRC 555
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Quote:
Originally posted by Boostup!
You're only running ~10 deg advance up top? Wow, that's VERY conservative....I guess you have to, 12 psi on a stock RS motor w/o water injection is pretty dangerous.
Toon
Its 16psi on pump gas (93 octane)

Also I'm running a little more advance than 10 deg up top, I was just saying you can run above 10. Like you I used to run close to 19deg when running around 10psi. Every pound of boost raised I ended up pulling around a degree.

Thanks for the tip on the nozzle choices for WI.

Last edited by WRC 555; 04-13-2004 at 04:35 PM.
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Old 07-19-2004, 01:36 PM   #12
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Any results from the track yet? How's the motor holding up?
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Old 10-03-2004, 09:24 PM   #13
WRC 555
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Sorry for the delay in response. Motor is still fine. Pushing near 18psi now with the Link Plus controlling boost instead of the MBC. Have spent lots of time fine tuning my car along with some other RS-T's. No drag times yet. I will go soon to get trap speeds. Need to make it back home Will post here with results.
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Old 10-04-2004, 06:41 PM   #14
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i have the avo kit on my car, and i want to run more boost, probably like 10-12 psi, do i need to get a different computer and a front mount? cause doesnt the avo computer cut the fuel after 6psi? will the top mount be enough for that much boost?
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Old 10-04-2004, 08:42 PM   #15
WRC 555
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What year is your car?

I'm still running a top mount. I dont know what the AVO comes with..are they piggy backs? You can get a Link Plus or Hydra Nemesis to control the engine but make sure your fuel system is up to par for what you want to run(pump, injectors, tune).. To run 12psi you want to use around 55lbs (~560cc/min) injectors to keep the duty cycle safe. For best results have it tuned on a load dyno such as a Dyno Dynamics, or Dynapack. I'm not too fond of Mustangs but they do the job too. I think DynoJet does have load dynos now but I guess it depends on where you live and who has what.
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Old 10-04-2004, 09:09 PM   #16
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i have a 2000 2.5rs. its a piggyback computer for the avo kit. but i think it has a fuel cut on it. so i think it may limit the amount of boost you can run, but tahts probably only because of the stock injectors. i think if i got bigger injectors i could just take the fuel cut out, since its like a seperate little computer spliced in. and there is like a junkyard with like wrx's sti's and evo's that has a dyno and tunes. its in new jersey, i think its like an hour away from where i am. which is near quakertown, pa. thanks for the info dude. oh yeah. i was also wondering, does it matter if the blow off valve isnt blowing back into the intake or not? cause i am using my friends from his turbo mustang. i could put it back into the intake cause his has a piece coming off that allows for it.
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Old 10-04-2004, 09:20 PM   #17
WRC 555
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It doesnt matter for the BOV, your car is MAP based, just make sure its not set too loose or too tight, for example you dont want it to to flutter when your running 6psi, it should release with ease and wise versa.

As far as EMS, I hightly recommend getting rid of the factory ecu along with every other piggy back that spliced in there. Go with stand alone, THEN you may go 10psi+ range.
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Old 10-05-2004, 07:52 AM   #18
X4 SRT
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Dude those are some really good numbers. I also an't beleive you're running so much boost. That's just amazing to me. I never thought the stock block would be able to handle that much. How long have you been driving around with your turbo set-up? What are you running for EMS? Are you running just the link plus with the stock ECU, or are you running a stand alone like you recomend for 10+psi. I'm very interested in this because I have the chance to buy a ludespeed III kit off a guy I know for only 1200. I'm thinking about it, but am not quite sure yet.
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Old 10-05-2004, 11:12 AM   #19
WRC 555
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Link Plus is a standalone EMS. I have been turbo'd for almost 3 years. Running 16-18psi for around 6 months now. But its been pushing above 10psi for about 2 years now. Compression is still fine and head gaskets seems to be holding up for now. After more careful tuning I have brought my EGTs to a safe value w/o water injection.
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Old 10-05-2004, 03:26 PM   #20
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Nice man, nice. I always wanted to turbo the RS... but then that little addition under it in my profile hindered that project.

- Scott
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Old 10-05-2004, 03:31 PM   #21
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even though 18psi is pushing the limits, this just further goes to show ITS ALL ABOUT TUNING

good job, i plan on upping my boost to 11psi very soon here, but with your results maybe ill go crazy and go to 14, LOL. jk, i dont have good luck.

keep us posted.

Ben
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Old 10-06-2004, 04:33 PM   #22
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Quote:
Originally Posted by X4 SRT
Dude those are some really good numbers. I also an't beleive you're running so much boost. That's just amazing to me. I never thought the stock block would be able to handle that much
That's because everyone spreads mis-information. The RS can only handle 5-6psi.
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Old 10-06-2004, 06:36 PM   #23
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Quote:
Originally Posted by ratt_finkel
That's because everyone spreads mis-information. The RS can only handle 5-6psi.
Agreed, mis-information is a amazing thing... I remember running about 16 PSI on mine though the small T3 turbo had would not make anything more than 250 wheel horsepower. The turbo was the lacking part. If tuned well the RS tuned well with good fuel and air flow can run easily into the 300 wheel horsepower range, of course with higher octane fuel.

Cheers,
Bill Knose
Lead Tuner
I-Speed USA
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Old 10-07-2004, 06:01 PM   #24
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blahhhhhh my 2nd gear exploded! guess ill have to wait a while for a new ems it wasnt even my fault, it was my friend who did it. so hes gonna pay half for an sti ra gearset. oh well. damn breakable stuff. i might end up selling my car this summer. then ill probably buy a worked wrx or sti about a year after that.
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Old 10-07-2004, 08:10 PM   #25
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18 psi... thats crazy.... you the man..
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