More 2.5 STI short block info...
which head flows more? WRX or STI? i would assume it is the sti head correct? If so do you have any CFM numbers to compare it with?
Also if u were to port the wrx heads would they be comparable to the STI' heads? as far as flow.
Also if u were to port the wrx heads would they be comparable to the STI' heads? as far as flow.
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well, with your stock WRX heads, all else being equal, the STi "headed" engine will have higher performance. I think the main point of this upgrade is to have a relatively inexpensive way to use your current goodies and get the benefit of 25% more displacement to boot.
I'm interested, as well, Chris, especially if it can be for under $3000.
I'm interested, as well, Chris, especially if it can be for under $3000.
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Good news. I spent my whole holiday weekend with Crawford Performance. I know I didn't get any vacation but I think you will all appreciate the outcome of our endless nights and countless hours of labor.
Needless to say we will be dynoing some interesting things in the next week or so.
I will keep you all posted
Chris
I-Speed USA
cescanmilla@i-speedusa.com
Needless to say we will be dynoing some interesting things in the next week or so.
I will keep you all posted
Chris
I-Speed USA
cescanmilla@i-speedusa.com
Last edited by I-Speed USA; Sep 7, 2003 at 12:22 PM.
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Here are two dyno plots/comparison people have been waiting for:
RED Graph is with a 2.0 WRX with these mods:
Helix up pipe
Samco IC hoses
NGK Platinum 7’s
I-Speed USA tuned ECUtek
Running 16psi
Blue Graph is a 2002 WRX with a 2004 STi 2.5 short block with STi shortblock stock internals:
Helix up pipe
Samco IC hoses
NGK Platinum 7’s
I-Speed USA tuned ECUtek (which was the same map for the RED graph)
3” turbo back exhaust
VF30
Running 16psi
Next we will be Dynoing Crawford Performance wrx rebuilt heads. These will mate perfectly with our STi setup.
Chris
I-Speed USA
cescamilla@i-speedusa.com
RED Graph is with a 2.0 WRX with these mods:
Helix up pipe
Samco IC hoses
NGK Platinum 7’s
I-Speed USA tuned ECUtek
Running 16psi
Blue Graph is a 2002 WRX with a 2004 STi 2.5 short block with STi shortblock stock internals:
Helix up pipe
Samco IC hoses
NGK Platinum 7’s
I-Speed USA tuned ECUtek (which was the same map for the RED graph)
3” turbo back exhaust
VF30
Running 16psi
Next we will be Dynoing Crawford Performance wrx rebuilt heads. These will mate perfectly with our STi setup.
Chris
I-Speed USA
cescamilla@i-speedusa.com
Last edited by I-Speed USA; Sep 10, 2003 at 04:35 PM.
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It would be nice to see one more graph. Same as red, but with VF30 instead of the stocker.
My question is, what is the point to run a bigger motor with bigger turbo and still use 2.0L stock turbo map?
My question is, what is the point to run a bigger motor with bigger turbo and still use 2.0L stock turbo map?
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About flow difference of heads.
I do not know how much more the USDM STi head flows versus the USDM WRX head, but I do know, that any JDM AVCS head has muuuuuuuuch larger intake and exhaust ports than the non-AVCS heads (WRX USDM). Also, the valves on the JDM STi AVCS heads are .5-1.0mm larger than the standard AVCS head valves.
Knowing that, I can safely guess, that USDM STi heads flow more than the non-STi USDM WRX heads.
I do not know how much more the USDM STi head flows versus the USDM WRX head, but I do know, that any JDM AVCS head has muuuuuuuuch larger intake and exhaust ports than the non-AVCS heads (WRX USDM). Also, the valves on the JDM STi AVCS heads are .5-1.0mm larger than the standard AVCS head valves.
Knowing that, I can safely guess, that USDM STi heads flow more than the non-STi USDM WRX heads.
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Alex - "My question is, what is the point to run a bigger motor with bigger turbo and still use 2.0L stock turbo map?"
We decided to load a map that we thought would be a reasonably safe to start tuning the "new set-up" with . The map seemed to work fairly well, (with a little more fuel of course).
I agree it would be nice to see another map to see a better comparison. I will look through some files tomorrow and see what I can dig up.
Chris
We decided to load a map that we thought would be a reasonably safe to start tuning the "new set-up" with . The map seemed to work fairly well, (with a little more fuel of course).
I agree it would be nice to see another map to see a better comparison. I will look through some files tomorrow and see what I can dig up.
Chris
Originally posted by Imprezer
About flow difference of heads.
I do not know how much more the USDM STi head flows versus the USDM WRX head, but I do know, that any JDM AVCS head has muuuuuuuuch larger intake and exhaust ports than the non-AVCS heads (WRX USDM). Also, the valves on the JDM STi AVCS heads are .5-1.0mm larger than the standard AVCS head valves.
Knowing that, I can safely guess, that USDM STi heads flow more than the non-STi USDM WRX heads.
About flow difference of heads.
I do not know how much more the USDM STi head flows versus the USDM WRX head, but I do know, that any JDM AVCS head has muuuuuuuuch larger intake and exhaust ports than the non-AVCS heads (WRX USDM). Also, the valves on the JDM STi AVCS heads are .5-1.0mm larger than the standard AVCS head valves.
Knowing that, I can safely guess, that USDM STi heads flow more than the non-STi USDM WRX heads.
Cost?
-Gagan
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From: keep santa cruz weird
Car Info: 2003 blue EVO
Originally posted by I-Speed USA
Good news. I spent my whole holiday weekend with Crawford Performance. I know I didn't get any vacation but I think you will all appreciate the outcome of our endless nights and countless hours of labor.
Needless to say we will be dynoing some interesting things in the next week or so.
I will keep you all posted
Chris
I-Speed USA
cescanmilla@i-speedusa.com
Good news. I spent my whole holiday weekend with Crawford Performance. I know I didn't get any vacation but I think you will all appreciate the outcome of our endless nights and countless hours of labor.
Needless to say we will be dynoing some interesting things in the next week or so.
I will keep you all posted
Chris
I-Speed USA
cescanmilla@i-speedusa.com
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