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Old 06-26-2008, 01:17 PM   #1
25rsti
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Default Complicated Hybrid Question

Im planning on doing an sti shortblock with built wrx heads.

i just ordered my sti intake manifold but now im wondering if i can use my wrx tgvs. If not do they make tgv deletes for my top feed? i can only find tgv deletes for sti sidefeed.

I already have my new top feed injectors and would hate to find out i must go sidefeed now after purchasing an sti intake mani.

Need help, thanks
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Old 06-26-2008, 02:31 PM   #2
Rasmusson14
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delete the WRX tgv's yourself. It really is simple and free (minus the purchase of dremel tools if you don't have any)!
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Old 06-26-2008, 08:46 PM   #3
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will my tgvs connect to a sti intake manifold?
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Old 06-27-2008, 02:27 PM   #4
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If its a USDM STi intake manifold, there is no difference between it and the WRX unit. One of the JDM manifolds is a one piece unit without TGV's. Which one do you have? There is no performance difference between the USDM STi and WRX manifold.
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Old 06-27-2008, 05:55 PM   #5
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That flaking red paints gotta be worth 10 hp.
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Old 06-27-2008, 05:55 PM   #6
25rsti
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i just got my sti intake manifold in today. it bolts and fits fine with the wrx tgvs. thanks everyone for the info.

i was doing more research and found out i could use my 2.5rs n/a intake manifold with no tgvs ..."what to do what to do"

What do you guys think?????
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Old 06-27-2008, 06:26 PM   #7
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Quote:
Originally Posted by 25rsti View Post
i just got my sti intake manifold in today. it bolts and fits fine with the wrx tgvs. thanks everyone for the info.

i was doing more research and found out i could use my 2.5rs n/a intake manifold with no tgvs ..."what to do what to do"

What do you guys think?????
A reliable source told me some of the Puerto Rican cats run that manifold with dyno proven results. Do you want to sell it?
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Old 06-28-2008, 12:06 AM   #8
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Quote:
Originally Posted by kellygnsd View Post
A reliable source told me some of the Puerto Rican cats run that manifold with dyno proven results. Do you want to sell it?
good thing im puerto rican
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Old 06-28-2008, 12:09 AM   #9
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is it the dohc 2.5 or sohc 2.5? or both?
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Old 06-30-2008, 11:33 AM   #10
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i have options.....i have both sohc and dohc n/a 2.5rs intake manifold and a brand new sti intake manifold. which should i use and what mods need to be done to make it work? thanks
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Old 06-30-2008, 01:57 PM   #11
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I haven't personally talked to anyone running the N/A manifold so I can't help you there but I do recomend you sell me your DOHC 2.5.L N/A manifold and research the rest and get back to us.
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Old 06-30-2008, 05:58 PM   #12
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to my knowledge the intake manifold you want is the best subaru has made ...though money talks
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Old 06-30-2008, 09:17 PM   #13
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The USDM STi manifold will only work with the USDM Drive By Wire (DBW) throttle body.
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Old 07-01-2008, 12:25 PM   #14
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so how would that work in mycase? sti shortblock built wrx heads sti intake mani...what needs to be done?
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Old 07-02-2008, 09:17 PM   #15
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anybody?
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Old 07-02-2008, 09:27 PM   #16
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Quote:
Originally Posted by 25rsti View Post
so how would that work in mycase? sti shortblock built wrx heads sti intake mani...what needs to be done?
Wire in a DBW throttle and ECU?
Drill and tap the manifold for the cable throttle body?
Use a WRX/RS manifold?
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Old 07-02-2008, 10:08 PM   #17
69subaru360
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Will a 98 2.5 dohc N/A manifold bolt to 02 WRX heads? If so I am set, I have 2 of those manifolds in my garage.
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Old 07-02-2008, 10:16 PM   #18
25rsti
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i have 03wrx intake mani, 04-07 sti intake mani, and a 99 dohc n/a mani, and if u want to count my 02rs sohc n/a intake mani



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Old 07-02-2008, 10:20 PM   #19
69subaru360
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Does the bolt pattern on the N/A 2.5 manifold match the wrx heads? If so I'm going to swap my N/A manifold onto my WRX for an easy TGV delete.
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Old 07-03-2008, 06:11 AM   #20
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wont this throw a bunch of cel's
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Old 07-03-2008, 08:17 AM   #21
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Quote:
Originally Posted by 25rsti View Post
wont this throw a bunch of cel's
Yes, you just turn off all the codes when you retune for TGV deletes.
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Old 07-03-2008, 10:35 PM   #22
25rsti
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so after my whole build is complete im most likely going to have cel codes all over and then when i get my car tuned ill be alright and pass inspection????
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Old 07-03-2008, 10:52 PM   #23
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Quote:
Originally Posted by 25rsti View Post
so after my whole build is complete im most likely going to have cel codes all over and then when i get my car tuned ill be alright and pass inspection????
Your break-in tune is one of the most important things and should be considered part of the build. Don't try and break in your new motor without at least a rough tune and at that time you can have the cels turned off.
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Old 07-03-2008, 11:29 PM   #24
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im really confused when it comes to this. if i get the motor built and then installed, will i be able to drive to a tuner?
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Old 07-04-2008, 12:18 AM   #25
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Quote:
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im really confused when it comes to this. if i get the motor built and then installed, will i be able to drive to a tuner?
Most guys that tune cars will send you a startup map to flash so you can run it until you get it to them. If you don't know what you are doing, just don't be stupid with it until somebody who does know what they are doing looks at it for you.
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