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12-22-2003, 07:42 PM | #1 |
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STi/WRX 20g dyno numbers
Greetings everyone,
Not quite sure where to put this...but lots of people in this forum (factory 2.0 and factory 2.5) have asked to see the data. That being said...please excuse the double post. Well we finally got around to posting our 20G sti/wrx dyno sheet. The dyno runs were taken a little more than one month ago. Of course the car is running a "little" stronger now Here is a list of the modifications done to the hybrid (Sti/WRX/20g Ver1). Modifications - USDM 2.5L STi Shortblock - USDM 2.0L WRX stock Heads - M2 Turboback Exhuast - Helix Uppipe - STi Injectors - Walbro Fuel Pump - 20G Turbo (15.5 PSI, yeah that is it) - I-Speed ECUtek These tests were conducted on only 15.5PSI becuse the tiny little STi injectors cannot handle any more work. FYI, the duty cycle on the injectors was about 90%. Chris I-Speed USA [email protected]
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12-22-2003, 09:08 PM | #2 |
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Very weak
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12-22-2003, 09:13 PM | #3 | |
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what kind of A/F are u running?? 90% duty cycle seems high |
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12-22-2003, 09:43 PM | #4 | |
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2.5L Block with stock 2.0L heads, far from a STi motor. |
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12-22-2003, 09:57 PM | #5 | |
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i just think the AF is off |
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12-22-2003, 11:00 PM | #6 |
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wow, my STI ran 245/260 on ATPs dyno with just a Greddy cat back, and my AF ratio sucked! What do you think the problem is??
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12-23-2003, 01:40 AM | #7 | |
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206.1whp/3=68.7 206.1+608.7= 274.8 crankhp which sounds reasonable before anyone says that I used a 33% loss, look again. I used 25% loss as an example in the math |
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12-23-2003, 02:01 AM | #8 | |
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12-23-2003, 03:03 AM | #9 | |
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Quote:
also I believe that is the stock WRX intake/intercooler setup. |
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12-23-2003, 03:21 AM | #10 |
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Was the 20g fully spooled by 3500?
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12-23-2003, 04:41 AM | #11 |
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"Was the 20g fully spooled by 3500?"
Remember, it's only pushing 15.5 psi so full spool probably wouldn't hit until closer to 4000, which imho is pretty good for a 20g. When the boost gets cranked to 20+ lbs then the 20g will start cranking right Chris? Btw what octane was this tuned on? good ol' 91? ~Evan |
12-23-2003, 08:35 AM | #12 |
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It looks good (nice flat torque curve).
Think of it this way. 280 hp only running 15psi. With a little more agreessive tune of 20psi, it should be pumping out 340hp. This is based upon 12hp per psi of additional boost. Keep the updates coming. |
12-23-2003, 10:10 AM | #13 |
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Yeah... whoever thinks that the stock WRX heads are in the same league as the STI heads are on crack! 280WHP at 15.5 PSI on bone stock heads is VERY respectable. Remember.. it's not the peak numbers that mean anything... it's the fact that this thing has such a WIDE powerband that matters.
That's the beauty of the 2.5... you can make the same power with much less effort. 280WHP on a stage 4 car is FMIC, 1820/SR40, and AGRESSIVE tuning and boost response, and even then, it's knock city, and tempermental. I'm VERY excited to finish build #4. I just got my heads, 3 angle valve job, port work, and CC work to reduce compression back to 8-8.1:1. Having 785's I'll have no problem supplying fuel to something like an SR50 or bolt on garrett, assuming the MAF holds out that far. Jorge (RiftsWRX) www.ProjectWRX.com |
12-23-2003, 10:20 AM | #14 |
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results look good, especially for the boost level. I have read a rumor that the "G" turbos don't really wake up until over 20psi, is that correct?
also, was that on the stock IC? |
12-23-2003, 11:19 AM | #15 |
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This isnt bad for such low boost. Id like to see a run with the turbo pushing all it can so the community will have a better idea about how factory wrx heads will perform with this block. My guess is that theres another 50whp available.
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12-23-2003, 11:35 AM | #16 | |
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Jorge (RiftsWRX) www.ProjectWRX.com |
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12-23-2003, 02:42 PM | #17 |
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Hi Guys,
The whole goal of this set-up is to provide reliable strong power. It seems that we have met those requirements. But...we always want more, dont we? Here are some answers to inquiries: - We have things in the mix (larger injectors and fuel rails) to run 20+psi - The car is tuned for good ol' CA 91 octane (everything from Arco to Union 76) - Oh yeah, we are using a Spearco TMIC Chris I-Speed USA [email protected] |
12-23-2003, 04:05 PM | #18 | |
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12-23-2003, 04:14 PM | #19 | |
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-st |
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12-23-2003, 09:14 PM | #20 | |
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Big thumbs up to Andy, Bill, Chris, and Adam who continue to provide for the subaru community. ~Evan |
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12-26-2003, 12:57 AM | #21 | |
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whats the a/f ratio?? why are u running the injectors at such a high %? |
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12-26-2003, 03:14 PM | #22 |
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The injectors are at a high duty cycle because the car/set-up is putting out quite a bit of power. We could run lower boost and then go to a lower duty cycle. But, that’s not what we want. We were trying to find the limits of that set-up and 15.5 psi and ~90% is what worked with the 20G and 565’s.
Chris I-Speed USA [email protected] |
12-26-2003, 03:48 PM | #23 |
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Chris,
Then a 20g on a sti with just a down pipe will probably pushing 100% idc near the top of the rmp range even on stock boost. |
12-26-2003, 06:25 PM | #24 |
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wrex03 - That is a possibility. However, there are currently too many tests and not enough time. Care to take on the 20g/sti/dp hypothesis and get back to us?
Chris I-Speed USA [email protected] |
12-26-2003, 07:34 PM | #25 |
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Do you know were I can get one? I have a delta dash so, everything else would be easy.
Dave |
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