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Old 03-13-2012, 11:19 PM   #1
wrxwagon0518
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Default hybrid motor good idea?to hybrid owners

I em considering doing a hybrid motor because i spun a bearing. So far I know I need the 2.5 sti block and I think I will use the oem sti head gaskets,bigger injections. i want to hear from some hybrid owners. Do you like it?Is it worth it?Have you had many problems with it?Also please tell your story and give me some advice.I read up on it and so far its either a good idea or a horrible one
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Old 03-13-2012, 11:29 PM   #2
NW2TONE
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its good if you do it properly and have the chambers on the heads opened up.
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Old 03-13-2012, 11:37 PM   #3
wrxwagon0518
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I have a trustworthy machanic that is going to be doing it. I want to know what i should do and what not to do so it doesnt get f***ed up
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Old 03-13-2012, 11:40 PM   #4
shilohb
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there is a lot that goes along with it
it is a good idea for the power but can be hard on the wallet
sti block weak spot is the pistons..
the wrx heads are fine but the cams are not close to the sti cams
so you need a more aggressive cams setup to even make sti power
the compression is the next issue you can do one of three things to lower the compression
1. thicker head gasket not the best way to do it
2. custom pistons better but not best
3. machine the heads for proper compression and it also removes any hot spots
from what I have heard from big named engine builders a few out there are not lowering the compression on crazy builds the real aggressive cams take care of any high compression issues because of the overlap
there are a lot of big hp hybrid builds out there with just a thick head gasket but it can be a gamble
you will need at least a vf39 to keep up with the 2.5... a 20g or dom 3 would be a great turbo for a mild cam hybrid
if you go any bigger than a vf39 you need 700 to 800+cc injectors and a bigger fuel pump
here read up
http://forums.nasioc.com/forums/show....php?t=1431376
Trying doing a little digging in the "Built Motor Discussion" forum:
http://forums.nasioc.com/forums/show....php?t=1085359
http://forums.nasioc.com/forums/showthread.php?t=903873
http://forums.nasioc.com/forums/show....php?t=1942615
http://forums.nasioc.com/forums/show....php?t=1356918
http://forums.nasioc.com/forums/show....php?t=2002598
http://forums.nasioc.com/forums/show....php?t=1038227
http://forums.nasioc.com/forums/show....php?t=1082001

Last edited by shilohb; 03-13-2012 at 11:48 PM.
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Old 03-13-2012, 11:43 PM   #5
WrXtaCy2003
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I had a hybrid with NON cut chambers and ~9.5:1 CR on 20-28 psi of boost for 35/40k with no problems (related to being a hybrid that is). I've also built many of them for others, and they have had no issues. Is it optimum to have your chambers cut, of course, have MANY (thousands) of builds been done with out it, also yes. It really comes down to money and convenience, I think at least. My .02c.

DK
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Old 03-13-2012, 11:50 PM   #6
wrxwagon0518
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I dont want to make huge power.I would like to keep the stock tranny.Untill I swap to a 6spd.I would like to be around 400-450 at the crank.That would be enough for me
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Old 03-14-2012, 12:00 AM   #7
shilohb
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Quote:
Originally Posted by wrxwagon0518
I dont want to make huge power.I would like to keep the stock tranny.Untill I swap to a 6spd.I would like to be around 400-450 at the crank.That would be enough for me
You will need a vf39 and e85 or dom 3 or a 20g on 92 higher
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Old 03-14-2012, 12:06 AM   #8
wrxwagon0518
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thats no problem because the turbo went with the motor too hahaha. i already have a walbro 255 fuel pump.most likely i will buy a used turbo from someone on this forum to save some money
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Old 03-14-2012, 12:24 AM   #9
shilohb
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I have a twinscroll 35r on my hybrid should be north of 550 whp
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Old 03-14-2012, 12:32 AM   #10
wrxwagon0518
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does this set up sound good sti block,oem sti head gaskets,650 injectors,VF39 or VF43,sti tmic,also a protune. em i missing anything?
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Old 03-14-2012, 12:34 AM   #11
shilohb
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Make sure you use a good tuner if you keep it 9.5 -1
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Old 03-14-2012, 12:39 AM   #12
wrxwagon0518
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ok thank you for the advice
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Old 03-14-2012, 01:16 AM   #13
NW2TONE
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relocate the IAT sensor and get some two step colder brisk racing plugs
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Old 03-14-2012, 09:07 AM   #14
jamesryan
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Default defanetly do your research.

my hybrid build will be close to $20k by the time its done. don't forget the stock 5-speed is only meant to manage the stock power. 450hp will be a bit much for it. anything you upgrade will affect something else, I'm finding this out the hard way.-James
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Old 03-14-2012, 10:34 AM   #15
wrxwagon0518
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that were i would like to be but i am trying to save as much money as i can.ill be fine with a VF39 or VF43 and the hybrid setup.That should be enough power for me.that should put me around 300whp correct?I was at 242 whp with the stock motor and turbo with stage 2

Last edited by wrxwagon0518; 03-14-2012 at 11:17 AM.
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