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Old 02-08-2005, 08:53 AM   #1
Unabomber
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OMGHi2U Unabomber's first dyno run

I finally went to the dyno. I have mixed feelings about the run as it's not what I expected, yet very very good for what it is.

Final numbers were 224HP/224TQ

Observations: This dyno (Dynojet) normally sees a stock WRX putting down 160-170HP. This run was the best of three with each getting slightly better. Max PSI seen according to the dyno operator was 13 PSI. While 224HP is really good for a Cobb Stage 2, I'd love to see what numbers would show up if I was running 16 PSI. Considering my mods are WAY out of Stage 2 specs, I am not at all surpised I wasn't seeing stock boost or Cobb's target Stage 2 boost. I will rectify that this summer when I got to get a custom tune in Salt Lake City. My goal is to meet/beat the stock turbo record.

Power mods:
2004 Subaru WRX Sports Wagon
Perrin Pulley
Vishnu non-flex uppipe
TurboXS Stealthback no cat version
Prodrive axle back muffler
Cobb AccessECU Stage 2 (using HWG 93 octane map)
Cobb AccessPort upgrade
Borla Headers
JDM Ver. 7 STi Intercooler (with associated scoop, spray, shroud, etc)
Monster P&P & Internal P&P of stock turbo
Turbo wrap on the exhaust housing by ThermoTec
Throttle body bypass mod
Crucial Racing Thermostat



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Last edited by Unabomber; 02-18-2005 at 03:27 PM.
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Old 02-08-2005, 08:57 AM   #2
HUnterD
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go big ron lay down the powa!
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Old 02-08-2005, 09:52 AM   #3
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that is pretty for an AP2 WRX. how come the boost is so low.
of course things would look better w/ higher boost.
i would think ur numbers would be better also w/ the work done to ur stock turbo.
do u still have the same comressor wheel too?
where is there an AWD dyno in va bch or did u go out of state?
definitely need a good custom tune.
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Old 02-08-2005, 10:02 AM   #4
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Cobb Stage 2 is a TBE. I added a pulley, bigger TMIC, headers, uppipe, and P&P turbo. I am 100% sure there are no leaks, so I assume the added mods cause a PSI loss somewhere in the mix. I ain't no tuner, so I really don't know what is causing the loss.
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Old 02-08-2005, 10:03 AM   #5
scoobyimprza
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PIAA WINDSHIELD WIPERS!!!!!!!!!!!!!!!!!!!!!!!!!1!!!*jogging suit*!!!!!!!!
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Old 02-08-2005, 10:22 AM   #6
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not knocking your car at all, but man thats alot of mods for the power level.
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Old 02-08-2005, 10:48 AM   #7
MINO
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Your header is causing improved volumetric efficiency. The lower boost is normal for an aftermarket header. My HKS Header (wrapped), my buddy's GPmoto(coated) and anothers borla, all did the same.

I had to get my ecutek remapped to hold the higher boost.

I removed my pulley after AZscoobie reported ignition problems when tuning with them.

What are your AFRs?
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Old 02-08-2005, 10:53 AM   #8
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With all your FAQ's you would think you would have better luck?

~v6
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Old 02-08-2005, 10:54 AM   #9
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Curious, what was the "sample time" for the dyno run (how long did the dyno pull last)?

Many dyno operators fear destroying a customerís vehicle, so they perform very quick dyno pulls and never allow the engine to fully load itself. This might be what is causing the low boost on the dyno... especially if you are seeing more boost on the street in a high gear. However, 224 whp is still nothing to balk at.

Good numbers.
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Old 02-08-2005, 10:55 AM   #10
V6TurboTA
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Quote:
Originally Posted by Bayley
Curious, what was the "sample time" for the dyno run (how long did the dyno pull last)?

Many dyno operators fear destroying a customerís vehicle, so they perform very quick dyno pulls and never allow the engine to fully load itself. This might be what is causing the low boost on the dyno... especially if you are seeing more boost on the street in a high gear. However, 224 whp is still nothing to balk at.

Good numbers.
That or it could be the custom port job... thats the reason for lost boost about 85.9% of the time.

~v6
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Old 02-08-2005, 10:58 AM   #11
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What is the RPM scale?

I'm guessing the ends are 2K and 8K.
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Old 02-08-2005, 11:57 AM   #12
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If it's a dynojet just get them to give you the dyno file ... something like DYNORUN.002. You can then download the free dynojet viewer and analyze the run yourself.

t
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Old 02-08-2005, 12:19 PM   #13
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STI springs reduce boost.
Good job Ron.
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Old 02-08-2005, 12:43 PM   #14
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Glad to have you back. Get that boost up and boy she'll scream. Hope all is well in the land of the HR.

James
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Old 02-08-2005, 03:24 PM   #15
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Ron, just curious, where was it dynoed at?
Don't be too concerned with your power output. Those are great numbers for running nearly 2 lbs under 1 bar. You will see a huge jump once you push your boost to the 16lb. (1.1 bar) range. 60 whp beyond stock w/o any boost gain is very impressive! That's also a nice flat torque curve you've got working there, not to mention your power peaks overlap perfectly. So don't let anyone tell you your car is weak. I suspect you will see another 25-30 whp/ftlbs on a good tune at 16-17psi.
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Old 02-08-2005, 04:23 PM   #16
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doesn't the ap have a boost gauge on it? what does that read?
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Old 02-08-2005, 04:44 PM   #17
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What gear was the dyno run done in? My stage one AP WRX would only get 12psi in third, but would do 14.5 in fourth and fifth. The dyno operator didn't want to do the run in 4th though, they only wanted to do 3rd gear.
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Old 02-08-2005, 05:11 PM   #18
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DYNO FAQ, MAKE sure you look at your boost gauge before you hit the rollers.
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Old 02-08-2005, 05:12 PM   #19
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Can you repost the pic but show the rpm's?
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Old 02-08-2005, 05:24 PM   #20
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Nah, you were making more boost. Anyhow, at this point you are at the limit of that stock fuel pump. Still very nice number for the limited mods man. Congrats. I am happy for you. That is 300 honest crank hp. And the ECU is not pulling timing at 4500rpm. Oh to have 93 octane. I can only imagine. Just add 4.44 and enjoy! I have seen stock turbo cars with stock manifolds with your level of mods make 225-230whp with 91 octane so you are close. The custom Dyno tune will make the difference.

Get rid of the pulley and put the torsional dampner back on.
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Old 02-08-2005, 06:05 PM   #21
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nice numbers ron. looking to head your directions modwise.
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Old 02-08-2005, 06:18 PM   #22
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Got a better pic of the dyno plot.. w/RPM?
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Old 02-08-2005, 06:38 PM   #23
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I ran the cobb stage 2 for about 3 months. I first ran uppipe/downpipe and cobb stage 2 93 oct map I was only boosting 14.2- 14.5 so I put the HWG (or whatever its called I forgot) anyway I then only saw boost of 13.5-13.8 I switched maps because I wanted to get the most out of my car, well turned out the map switch didnt help. Then when I got my catback I left the HWG map on and I was only seeing full boost of 11.8-12.4. When I saw that I was like WOW something is wrong here!!! so I switch back to the stage 2 93 oct regular map and bam I was boosting 15.8. Im not trying to start anything just telling you what happen in my case.
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Old 02-08-2005, 07:06 PM   #24
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Unabomber, how about helper spring, do you've got a black hole service?
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Old 02-08-2005, 07:23 PM   #25
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Isn't Stg supposed to put you at 280/285? Those are probably the right numbers with the power train loss. You really need a custome tune.
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