bobafett

arent the DSM turbos both water and air cooled?

i am leaning towards the 14b for now, but t25 may be nice too. my redline is 6200, so even after a rebuild i cant see revving over 6500 to be a common ocurance, and i assume that when people bitch about the crappy high end of a t25 that its not that bad at 6200-6500 rpm, which is the highest i will be revving...

then again it was mentioned that maybe even the 14b was too small for my motor, since its 2.0L, but i figure it came out of a 2.0 that made 200hp, and if i can make 200hp i will be really really happy!

whatcha think?

btw, this is terrible, but can you gimme a link to a SIMPLIFIED diagram about how the whole system works... i mean, i know how a turbo works, but i was told by SOMEONE, that you can use a cold air intake with a turbo setup, which didnt make sense, since doesnt the air that goes into the TB come from the exhaust side of the turbo? i guess i am still a little hazy on how the system works as a whole...i just need to see like an MSpaint version of where all the air comes from and goes! since even after all my reasearch some parts are still fuzzy to me!

guido_kp

i would go for the 14B, but they are both oil/water cooled. the 14B flows alot more cfm than the T25. i think somebody is blowing smoke up your *** about using a cai cuz the exhaust side is feeding the TB. the turbo is an exhaust driven pump. it has a "hot" exhaust side and a "cold" intake side. exhaust from your engine (heat+pressure) spin the turbine of the "hot" side, which is directly coupled to the compressor of the "cold" side. so the compressor does just that, it draws in fresh air and compresses it into a denser form that ends up in the TB. that air is heated up in the process, and the intercooler reduces its temperature before it enters the TB. what i meant was chopping up the cai and using it as charge piping. a cai on a turbo is kinda pointless cuz its getting heated and compressed by the compressor, and thats what intercoolers are for, anyway

bobafett

phew, thats kind of what i thought! ok now that i am a little more clear on that!

is there anything special about charge pipes? or could a generic CAI type pipe work fine? if so then i might as well go ahead with the CAI, since i can just take off the filter, and rig it up to the intercooler...

ok if air from the exhaust of the engine powers the turbo (from the manifold obviously) i guess that only "some" of the exhaust is passed into the turbo, and whatever cant be crammed in there goes into the collector, and down the downpipe, and out the back? am i on the right track, if that how it works then i have been thinking of it properly all along!

guido_kp

be creative with the charge pipes, keep in mind it needs to be able to withstand everything under your hood: heat, gas, oil, dust, etc. the cai piping will be a very good start, ive got a few stainless steel "U" bends from JC Whitney that ill be utilizing. the charge pipes from a stock turbocharged car will also work fine, youll want to stay around 2 inch diam with the amount of boost you are speaking of, and also radiator hose will work. but yeah youre on the right track by just removing the filter off of a cai and plumbing to an intercooler. now, all the exhaust goes thru the turbo, its the only place for it to go once it leaves the manifold(unless you got an external wastegate, but lets say you use the internal gate on your 14B). the turbo is a positive feedback device, as it controls how much boost it produces with the wastegate. the wastegate opens to relieve the turbo of exhaust that will not be used to spin the turbine. then it goes out thru the dp or is vented to atmosphere

bobafett

ok well that does make sense, but if i am understanding you properly, and the extra exhaust is vented into the atmosphere, whats the point of having an exhaust system!?! lol// i know i am missing some fundamental element here, but thanks for being patient with me! i appreciate it!

damn, CAI plumbing will prolly be 2.5" at that SMALLEST, maybe i will just get some JCwhitney ubends as well.. i am gonna by making my exhaust system out of mandrel bends from them, so i might as well order charge pipe stuff as well! now i just need to add it up and see if stainless exhuast is worth it or not! i guess it depends on how vain i am ! lol

guido_kp

naw, what i meant was you can either plumb the wastegate gases back into your downpipe or you can vent them to atmosphere. kinda noizy sounds like ----- some folks dig it tho. you need exhaust to prevent boost creep is the popular theory at the moment. and 2.5 inch cai/charge would prolly be cool, man. just be creative. it is a homemade turbo, its not gonna be perfect lol

Semnos

Yup..Damnn this post looks like a damn book.
"Boost for dummies"
hahahaha
I'm just joking man.
I know you're a noob.
Yeah the old honda map will only allow between 9 and 10 psi boost the newer maps will alow 10 psi or even 11 as I was told. Although there is an exception from a member on this forum that ran well to 20 psi without getting a CEL(Check Engine Light) so I don't know how he got away with it.
Blew up his engine though..it was all stock internals D-series engine.
turboing a car ain't that difficult just read a lot and don't forget components you need, like a BOV(Blow of valve). If you're handy with tools and working on cars than it's a snap.
Damnnn i have everything and ready to go, but still no turbo .

Gooed luck with yourr setup.
Post some pics if you done

bobafett

thx for you help, and believe me, i WILL post lots of pics when i am done..

right now here is the plan is getting pretty solid in my head, its just time to start saving for all these parts!