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Old 12-22-2003, 07:42 PM   #1
Crawford/I-Speed
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Default 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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Old 12-22-2003, 09:08 PM   #2
wgknestrick
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Very weak
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Old 12-22-2003, 09:13 PM   #3
YaZahX
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Quote:
Originally posted by wgknestrick
Very weak

what kind of A/F are u running?? 90% duty cycle seems high
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Old 12-22-2003, 09:43 PM   #4
dsmperformance
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Quote:
Originally posted by wgknestrick
Very weak
Those numbers are not from a USDM STi car.
2.5L Block with stock 2.0L heads, far from a STi motor.
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Old 12-22-2003, 09:57 PM   #5
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Quote:
Originally posted by dsmperformance
Those numbers are not from a USDM STi car.
2.5L Block with stock 2.0L heads, far from a STi motor.
the only head difference is the variable intake and i think some sodium in some valves..

i just think the AF is off
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Old 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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Old 12-23-2003, 01:40 AM   #7
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Quote:
Originally posted by Invisiguard
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??
Your car wasn't dyno'd at MZM. Dyno's read different and dyno runs are done in different gears by different tuners. It is MZM's policy to always dyno in the gear that is closest to 1:1. In the STi, that would be 5th gear. If you assume a 25% loss to the wheels for a 300hp, that would be 225whp, which is what that particular car dyno'd stock on the same dyno. Look at the Evo on that site. It dyno'd 206.1whp. assuming the same loss....

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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Old 12-23-2003, 02:01 AM   #8
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Quote:
Originally posted by metoo
Your car wasn't dyno'd at MZM. Dyno's read different and dyno runs are done in different gears by different tuners. It is MZM's policy to always dyno in the gear that is closest to 1:1. In the STi, that would be 5th gear. If you assume a 25% loss to the wheels for a 300hp, that would be 225whp, which is what that particular car dyno'd stock on the same dyno. Look at the Evo on that site. It dyno'd 206.1whp. assuming the same loss....

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
Umm, Im not sure what your talking about, but that car was Dyno'ed at ATP, same as mine, look at the name on the Dyno chart.
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Old 12-23-2003, 03:03 AM   #9
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Quote:
Originally posted by YaZahX
the only head difference is the variable intake and i think some sodium in some valves..

i just think the AF is off
wrong the STi cams are more aggressive and the cylinder heads flow better.

also I believe that is the stock WRX intake/intercooler setup.
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Old 12-23-2003, 03:21 AM   #10
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Was the 20g fully spooled by 3500?
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Old 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
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Old 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.
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Old 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)
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Old 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?
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Old 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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Old 12-23-2003, 11:35 AM   #16
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Quote:
Originally posted by mlambert
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.
That's what I'm thinking, a comfy 330WHP on 93 octane gas.

Jorge (RiftsWRX)
www.ProjectWRX.com
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Old 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]
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Old 12-23-2003, 04:05 PM   #18
TypeC
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Quote:
Originally posted by GRoceryTurbo
also, was that on the stock IC?
People have made well over 330awhp on the stock WRX TMIC. It's a good piece for stock.
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Old 12-23-2003, 04:14 PM   #19
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Quote:
Originally posted by I-Speed USA
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]
91 octane and 15.5 PSI? Wow, nice work guys.

-st
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Old 12-23-2003, 09:14 PM   #20
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Quote:
Originally posted by singletrack
91 octane and 15.5 PSI? Wow, nice work guys.

-st
I-speed rocks! For conversions, tuning, etc in CA you can't beat their prices, service, attention to detail, and it is always a enjoyable time in their presence!

Big thumbs up to Andy, Bill, Chris, and Adam who continue to provide for the subaru community.

~Evan
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Old 12-26-2003, 12:57 AM   #21
YaZahX
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Quote:
Originally posted by I-Speed USA
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]
yawn-
whats the a/f ratio?? why are u running the injectors at such a high %?
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Old 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
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Old 12-26-2003, 03:48 PM   #23
wrex03
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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.
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Old 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
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Old 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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