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Old 02-19-2009, 04:14 AM   #1
CB7lx91
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piping diameter.

So for a turbo I purchased a used Evo III Big 16g. MHI Compressor and Cartridge, but eBay "Big 16g" turbine housing. Don't ask me why an eBay turbine housing...just came that way, and I feel it shouldn't make a difference.

I was looking at the turbo, and the thing is tiny tiny tiny compared to what I imagined. I understand we only have 4 cylinders and all, but still...this thing is the size of my puberty stricken genitalia.

I was originally wanting to run 3" charge piping, because it looked so much cleaner that way, but now that I see the compressor...there is absolutely no way 3" charge pipes off of this will be efficient. I purchased 2.5" charge pipes, but the difference is still grand.

I have and still am checking out what other tuners have to say (I have been reading primarily dsm forums for this) about mix matching the 16g with bigger housings, and what does/ doesn't need to be improved on this snail.

The turbine housing looks like its sufficient for my goals, but as stated earlier, I feel different towards the compressor.

I remember talking to some tuners over the months and have been referred to an 18g hybrid, some 20g parts, and porting the housings.

BTW, my goals are 10-12lbs max on the stock bottom, and once I am sick of this build I'm goin a bit bigger and better.

Any help is appreciated, thanks.

Andy.
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Old 02-19-2009, 11:07 AM   #2
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2.5'' is still very big. a guy that builds honda motors near me uses 1.75'' hot pipes and 2'' cold pipes and is making wonderful power that is efficient and reliable and his power is ranging from 250whp-375whp depending on what motor he is building.
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Old 02-19-2009, 01:11 PM   #3
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The get into the efficiency range of a 3 inch intercooler is high boost/cfm. You will be simply happier with smaller. Less lag. Less boost loss on a small turbo (there is always a little) so I would say 2-2.5 inches is where you will be happy... I run 2 inch on a small intercooler on most of my setups.. but the only time they get beat on is the track or races and I have a sprayer for that... it all just depends...
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Old 02-19-2009, 01:18 PM   #4
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will the stock bottom end hold that much psi? ive been wondering this b/c i thought i'd have to rebuild my whole motor so i could turbo it
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Old 02-19-2009, 02:34 PM   #5
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I would go 2-2.5 for the piping. Are you going to run a 3inch downpipe?

Quote:
Originally Posted by f22a1accord View Post
will the stock bottom end hold that much psi? ive been wondering this b/c i thought i'd have to rebuild my whole motor so i could turbo it
THe stock bottom end will do 10-12psi pretty good, Anything over 15psi is pushing it. I've seen them put 20psi on a stock bottom end but it didn't last long. As long as it's rebuilt, 10-12psi is fine.
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Old 02-19-2009, 02:53 PM   #6
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I would go 2-2.5 for the piping. Are you going to run a 3inch downpipe?



THe stock bottom end will do 10-12psi pretty good, Anything over 15psi is pushing it. I've seen them put 20psi on a stock bottom end but it didn't last long. As long as it's rebuilt, 10-12psi is fine.
rebuilt as in stock parts in the bottom end? i'm building my head either way.

edit: back on topic. my friend has been trying to get me to buy his evo III 16g b/c he dont wanna put it on his talon. and if im not mistaken he uses 2 1/2 inch piping.
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Old 02-19-2009, 03:21 PM   #7
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Quote:
Originally Posted by f22a1accord View Post
rebuilt as in stock parts in the bottom end? i'm building my head either way.

edit: back on topic. my friend has been trying to get me to buy his evo III 16g b/c he dont wanna put it on his talon. and if im not mistaken he uses 2 1/2 inch piping.
Yeah with stock/oem replacement parts. I want to go turbo I don't have the funds to right now. Why doesn't he want to put it on his Talon?
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Old 02-19-2009, 04:27 PM   #8
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2.5 will be fine thats what i run on my setup.


and a stock bottem will hold 20 psi fine from what i have been told i have ran 10-15 psi fine for about a year with no problems
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Old 02-19-2009, 04:31 PM   #9
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2.5"piping is a good size.

The e3b16g is not a huge turbo, but there is essentially no lag, it flows well, and dsm guys have gone 10's with them.

I ran 15 psi for a while with my motor, but 10-12 is a good amount to run on it if you have a good tune.
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Old 02-19-2009, 07:39 PM   #10
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i am rebuilding my motor right now and have the same turbo setup as u. and i plan to run 12 psi also. i have 2.5 piping for mine with a massive intercooler, and i was wondering the same thing cause i just didnt see how this little turbo could boost through all that pipeing and the intercooler and still be able to build boost. but i will let u know how mine works out
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Old 02-19-2009, 08:54 PM   #11
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wow, more replies than I imagined.

I am going to run a 3" downpipe to a 3" exhaust, with a cat and a resonator and muffler.

The intercooler I'm going to use is an evo8 one, which has 2.5" side exits.

So I guess there is more than meets the eye with this snail after all....good to hear, good to hear.


And like I said earlier, I plan on tuning this bitch myself, so the tune will be nice (hopefully lol).

Alright, so I just need to rebuild her then. The compressor fins are a little tweaked, so I might as well just buy a tdo5h cartridge right?
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Old 02-19-2009, 10:19 PM   #12
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Quote:
Originally Posted by CB7lx91 View Post

Alright, so I just need to rebuild her then. The compressor fins are a little tweaked, so I might as well just buy a tdo5h cartridge right?
you already have cartrige so all you need is 16g super back rebuild kit + turbine wheel and compressor wheel, make sure you get same compressor wheel to match your housing and turbine wheel are all same 14b, 16g, evo3 16g also it have to be td05h not td05

edit: When you buy new turbine wheel and compressor wheel make sure they are balanced.
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Old 02-20-2009, 09:03 AM   #13
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You can have it 1.75 or 2inches and still run out 400whp
Its all about the setup on the exhaust to 3 inches because it goes into the throttlebody.

After you make more boost with the right setup you dont need big pipes goin to the throttlebody jus traise the boost and make sure you get more flow goin out thats all.
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Old 02-20-2009, 09:53 AM   #14
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Can everyone seriously stop saying "xx psi". It's retarded and meaningless. The psi an engine can "hold" changes with each turbo.

Don't ever set your goals on psi, but rather set power goals.

2.5" is fine for charge piping up to about 400whp, then it starts being a restriction.
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Old 02-20-2009, 10:52 AM   #15
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Yeah with stock/oem replacement parts. I want to go turbo I don't have the funds to right now. Why doesn't he want to put it on his Talon?
haha my point exactly. he has his whole 4g63 build from top to bottom and he is still on the stock turbo(t25) but the way is spools in is sick. he's runnin a short route FMIC too.
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Old 02-20-2009, 04:27 PM   #16
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Quote:
Originally Posted by d112crzy View Post
Can everyone seriously stop saying "xx psi". It's retarded and meaningless. The psi an engine can "hold" changes with each turbo.

Don't ever set your goals on psi, but rather set power goals.

2.5" is fine for charge piping up to about 400whp, then it starts being a restriction.
well ya u will have whp goals but i can say i want 400 whp but will my stock bottem handle it? u can make 400whp in diffrent ways......

its all on ur setup tuning and PSI.... so psi dose make a diff
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back from basic.... off to ait.... CB still being worked on i have mad plans for it .. sorry cant tell its on the hush hush for now but all i can say in somewhere around 500 hp soon to come..
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Old 02-20-2009, 04:33 PM   #17
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Not really.

You can make 400whp on 12psi with a certain turbo, and make 400whp on 20psi on a different turbo. It doesn't matter how much psi, what matters is the final output.

It's not about the psi. It is about tuning.
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Old 02-20-2009, 10:20 PM   #18
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It's all about how well your engine flow with given turbo, how fast turbo can recover amount of air that motor needs to make power, in 3k rpm your pushing 12psi and at 7k rpm same 12psi, so when you past it's efficiency now your turbo becomes restriction. Thats why bigger turbo makes more power over small ones plus they wont make heat that cause det. down side they spool at higher rpm so your power band stars from 5k rpm to 7k rpm lol

as for charge pipes if you don't have extreame turns over 90' then 2.5" is more that you need.
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Old 02-21-2009, 09:31 AM   #19
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Quote:
Originally Posted by keycb7 View Post
you already have cartrige so all you need is 16g super back rebuild kit + turbine wheel and compressor wheel, make sure you get same compressor wheel to match your housing and turbine wheel are all same 14b, 16g, evo3 16g also it have to be td05h not td05

edit: When you buy new turbine wheel and compressor wheel make sure they are balanced.
Alright cool thanks man, after work I'll start checking out some rebuild kits with wheels.

And for the sake of not buying more piping, I'll just stick with the 2.5" because that's what is sitting int he back seat of my car right now.

Any specifics on rebuild brand? eBay compared to MHI, seems obvious, though.
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Old 02-21-2009, 05:26 PM   #20
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I'm running 2.25" on my setup, and now that I'm getting closer to the 400 mark I am considering a staggered setup. 2.5 on the hot side, and then 2.75 or 3" on the cold side. Havent made up my mind yet though, still doing research.

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