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08-05-2008, 05:59 PM | #1 |
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Location: Essex-England-United Kingdom
Vehicle:2002 V7 STi Prodrive Edition... Black! |
Help frayz with his build please. (Few questions for the pro's)
Hey guys.
A few questions As some of you may know, im building a new motor for my bugeye. Im swapping out my 2ltr for a forged 2.5 that im building myself. I'll be using my 2ltr heads, but before i fit them i will be having the combustion chambers modified to fit the 2.5's 99.5mm bore. What i want to know is, what will i gain more from? Head porting or cams? How much extra power will porting add to stock heads if nothing else is changed? If i decide on cams will the Brian Crower BC0621 kit work in my 2ltr heads and will my AVCS still opperate correctly? What sort of power can i expect from this setup and what other mods will net me the most gains? As some of you know. Im from the UK and parts here are ridiculously expensive, so anyone that can help me out by shipping me some parts would also be greatly appreciated. I will be using the following parts. New EJ257 block New EJ257 sti crank Wiseco pistons Piston rings Carrillo rods ACL big end bearings ACL main bearings OEM head gaskets ARP 11mm head stud kit RCM oil pump New oem water pump PE kevlar timing belt NGK racing 8s Phenolic spacers Machined 2ltr STI heads with AVCS JDM Spec C inlet manifold Ceramic coated GTSpec Gen 2 headers 800cc injectors Hyperflow top mounted Oil cooler Turbocharger exhaust housing (8cm for my FP green) Exedy hyper Compe-R twin plate clutch, billet lightened f/wheel Breather/Oil separator Converted an fuel rails Parallel fuel system, hose fittings etc Fuelab fuel filter Cheers for reading, i hope you can answer my questions
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Last edited by frayz; 08-05-2008 at 06:06 PM. |
08-06-2008, 10:59 AM | #2 |
Scooby Specialist
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Nobody?
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08-06-2008, 01:28 PM | #3 |
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which version STi version heads do you have (big port v7 spec C or just the normal version 7)?
what parts do you already have and what do you need shipped? |
08-06-2008, 03:08 PM | #4 | |
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Quote:
I have everything that i have currently listed. However im wanting cams and springs/retainers. Valves too at a good price but i think at my level the stock valves will cope okay. What i want to know is, what will i gain more from? Head porting or cams? How much extra power will porting add to stock heads if nothing else is changed? If i decide on cams will the Brian Crower BC0621 kit work in my 2ltr heads and will my AVCS still opperate correctly? What sort of power can i expect from this setup and what other mods will net me the most gains? What are your thoughts buddy? |
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08-06-2008, 04:13 PM | #5 |
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I know the JDM heads use different sensors to pick up the cam position and can't recall off hand if they'll work (I still haven't played with JDM heads). Just to let you know, those cams are sold out as well.
I'd get cams and valves (address the seat throat too) before cams and port work... I wouldn't open up the combustion chamber. Maybe do some deshrouding but I wouldn't bowl it out. What kind of power are you trying to make? what turbo will you be running? You don't need port work unless you want some seriously big power, at which point I'd hope to see sleeves in the build Last edited by Homemade WRX; 08-06-2008 at 04:21 PM. |
08-06-2008, 04:17 PM | #6 | |
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Quote:
Gonna be on an 8cm 3" FP green minimum. Maximum of GT30 mate. I meant de-shroud, not bowl out. Sorry. Whats wrong with the seat throat as they are dude? |
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08-06-2008, 04:17 PM | #7 |
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Looking for a solid 450/450 at least
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08-06-2008, 04:22 PM | #8 |
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that'll be PLENTY of head work for a 450/450...30R it though. The 2.5 will spool the green to fast to be happy supplying air for 450...unless its a high reading dyno
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08-06-2008, 04:50 PM | #9 |
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Id do a GT30 in an instant mate however i have a problem
They only guys that make the rotated up/downpipes for RHD are RCM. They charge $1700 for them without a turbo or wastgate. If i could get some from the states to fit id be okay but as yet, i cant afford to do it |
08-07-2008, 10:53 AM | #10 |
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Why not do a stock mount GT30?
http://www.atpturbo.com/Merchant2/me...egory_Code=BCS That turbo is a GT30R with a custom turbine housing that is modelled after the garret housing. I'm suprised you don't want to buy from the states as the the US dollar is worthless over there... |
08-07-2008, 11:06 AM | #11 | |
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08-07-2008, 12:23 PM | #12 | |
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Quote:
Will that hybrid perform the same a a genuine GT30? |
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08-07-2008, 12:24 PM | #13 | |
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Quote:
Im taking £800- £1000 GBP!!! thats like $2000!!!!!!!! just for the pipes!! |
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08-07-2008, 12:46 PM | #14 |
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you beat me to it with the drop in 30R...
Frayz, it is completely bolt in and works with factory (or any other oem placed) uppipe and downpipe...as for the power limit because of the sizing, I'm not sure and have never run one. |
08-07-2008, 04:21 PM | #15 |
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Is it actualy going to offer me much more than an 3"/8cm green?
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08-07-2008, 06:52 PM | #16 |
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08-07-2008, 06:55 PM | #17 |
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Okay so the turbo is now under question... but back to my original questions guys....
What i want to know is, what will i gain more from? Head porting or cams? How much extra power will porting add to stock heads if nothing else is changed? If i decide on cams will the Brian Crower BC0621 kit work in my 2ltr heads and will my AVCS still opperate correctly? What sort of power can i expect from this setup and what other mods will net me the most gains? Cheers guys |
08-07-2008, 09:58 PM | #18 |
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Mark Remmick is making close to 9xx whp with stock heads. IE no porting. After talking with him, I think I am just going to go with cams for now, and maybe by a set of spare heads for later when I have the extra cash to have them worked. This way I can get a direct comparison.
Dustin |
08-08-2008, 03:10 AM | #19 |
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With cams, you add flow by opening the valves more/longer. With porting, you add flow at the existing lift/duration. Cams will add more power than porting alone because the longer duration gives the cylinders more time to pump. They also shift the powerband much more than porting alone would.
I can't answer whether or not the BC 272 cams will fit the 207, but assuming they do and based on dyno graphs I've seen, they should shift the powerband to the right 500-800 rpm and add 40hp or so. |
08-08-2008, 05:05 AM | #20 | |
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Quote:
So if the cams may add 40hp, any idea what porting might add on a stock motor for example? |
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08-08-2008, 08:28 AM | #21 |
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I would say cams over porting, cosworth and kelford does cams for the jdm avcs. Call kelford, very knowledgeable person! Ever thought of using the red instead of the green, that should give you what you are looking for and more.
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08-08-2008, 08:58 AM | #22 | |
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Quote:
Since yours is a hybrid build, you would be porting in an effort to get the 2.0 heads to flow enough air for the 2.5 motor. The cams are the main limiting factor there as you end up with a 2.5 STI motor with smaller than stock cams. Extensive port work on a flow bench could get you close to 40 hp. If you threw in larger valves you could probably exceed that. If I had to choose one or the other based on budget and time, I'd go with the cams. The fact that I can do my own port work means that I went with both plus .5mm oversized valves in my build. |
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08-09-2008, 04:55 AM | #23 |
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Any other input on wether the Brian Crower 2.5 ltr AVCS cams will work in my 2ltr AVCS heads?
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08-09-2008, 07:21 AM | #24 |
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08-09-2008, 09:09 AM | #25 | |
Scooby Specialist
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Join Date: Feb 2002
Chapter/Region:
MWSOC
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Vehicle:Not A Wagon! 2011 WRX - 285s on 18x9.5 |
Quote:
http://www.horsepowerfreaks.com/part...e_Sensor/12196 |
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