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Old 05-07-2017, 02:40 AM   #26
forcefedfour
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Originally Posted by svynx View Post
I'd recommend talking to a different tuner. I realize that some tuners are uncomfortable using certain software, or are unsure what an engine can take safely. Everyone posts up the failures and no one posts the successes (minus a few of them). That's why you only read about the bad experiences, which plays into peoples opinions on things. If you want to do a hybrid, do it. There is nothing wrong with a hybrid if it was built correctly i.e. don't skimp on the important parts. Use the hybrid pistons, or get the heads machined to match the bore of the 2.5 block. I'm finishing my hybrid build over the next two weekends. Even the shop is excited to see how much it makes because of all the little things that have been done.
I agree with what you are saying. I was surprised that a tuner in my area, that was recommended on this board, would say to NOT go this route.
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Old 05-07-2017, 10:58 AM   #27
cueball89
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I have over 100k miles on my hybrid setup. OEM sti short block and ASF chamber matched heads with sti cams. ~20k miles on a td04 230hp and 280 ft lbs of tq and the rest of the miles with an 18g xtr with ~300hp and 335 ft lbs of tq. All airboy road dyno numbers.
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Old 05-07-2017, 02:16 PM   #28
forcefedfour
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I have over 100k miles on my hybrid setup. OEM sti short block and ASF chamber matched heads with sti cams. ~20k miles on a td04 230hp and 280 ft lbs of tq and the rest of the miles with an 18g xtr with ~300hp and 335 ft lbs of tq. All airboy road dyno numbers.
That is what I like to hear. Of course people jump on the internet to complain but you almost never hear of the person that is having no trouble, because well.... they are out driving and enjoying life.

I am still torn on the proper route to go when making a hybrid. Machine the head or hybrid pistons. Is there some kind of clear cut winner?
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Old 05-08-2017, 07:10 AM   #29
Samurai Jack
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People do it both ways. If it was me, I'd have the chambers properly machined but that's me. Others prefer the hybrid piston route because it's less expensive.

More importantly,
Which way does the builder prefer? That is how you will get a better motor in the long run, presuming the builder knows what they are doing in the first place
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Old 05-08-2017, 07:58 AM   #30
svynx
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Originally Posted by forcefedfour View Post
That is what I like to hear. Of course people jump on the internet to complain but you almost never hear of the person that is having no trouble, because well.... they are out driving and enjoying life.

I am still torn on the proper route to go when making a hybrid. Machine the head or hybrid pistons. Is there some kind of clear cut winner?
The reason I went with the hybrid pistons over machining the heads: I wanted to put forged pistons in anyway. By going with the JE hybrid pistons, this fixed the quench area problem, and gave me the forged pistons, all in one shot. Down side of this: you are stuck with pretty much this piston only. Up side: No head work. If you decide to machine the heads, you have more options on pistons...stock if you wish, or anything that would work in a standard 2.5 engine.
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Old 05-08-2017, 12:20 PM   #31
horsePOOGAS
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I've never heard of hybrid piston. Is it pretty well straight forward drop in and use stock 2.0 heads?
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Old 05-08-2017, 01:09 PM   #32
svynx
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Old 05-08-2017, 01:55 PM   #33
forcefedfour
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The pistons were cool and I thought about going that way because I wanted forged internals anyways. But I was worried that the quench would be wrong, but it appears to fix all of this.
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Old 05-08-2017, 02:20 PM   #34
Samurai Jack
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Originally Posted by horsePOOGAS View Post
I've never heard of hybrid piston. Is it pretty well straight forward drop in and use stock 2.0 heads?
JE came up w/the hybrid piston so one would not have to have the 2.0L heads machined to match the 2.5L block.

People have been using them and have said they have no issues.

I personally like the idea of matching the head to the block
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Old 07-29-2017, 11:31 PM   #35
Ride4
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Default Update hybrid build

My hybrid build is still running very strong. It now makes 414whp and 420tq on airboy dyno. I took it out to Sacramento race park on a very hot day 98 degree. I ran a 12.5 with a 2.2 60ft and trapped 118.2 mph. Now who say ej251 block cant hold power?
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Old 05-18-2019, 01:40 AM   #36
Darksol503
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Originally Posted by Ride4 View Post
My hybrid build is still running very strong. It now makes 414whp and 420tq on airboy dyno. I took it out to Sacramento race park on a very hot day 98 degree. I ran a 12.5 with a 2.2 60ft and trapped 118.2 mph. Now who say ej251 block cant hold power?
Hey! Older thread but wondered if you'd share your parts list as I'm about to go down the route of a complete rebuild of my 2.0/2.5 hybrid Bugeye that I purchased last summer.
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Old 05-18-2019, 12:05 PM   #37
Nguyener2
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Hey! Older thread but wondered if you'd share your parts list as I'm about to go down the route of a complete rebuild of my 2.0/2.5 hybrid Bugeye that I purchased last summer.
Im in the process of building one too, can I pm you?
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Old 07-24-2019, 04:15 PM   #38
grangepack2
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How did this build go?
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Old 09-06-2019, 01:47 AM   #39
Boobaru05WRX
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Curious about this build also in 2019 lol. Iím trying to do a hybrid build by getting an IAG 2.5 short block+chamber matching the 2.0 Heads.
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