The differences between turbo's, and how to choose - Page 2 - Team-2G Mitsubishi Forum

SCR · 08-11-2006, 01:07 PM

Quote:

Originally Posted by DSM_ South West

I don't see where you get 3 out 125 from. Knowing myself, I'm gonna quit while I'm ahead. I really hope you newbs out there really take heed to some of the wiser DSMrs on here. Ignorance is what causes problems, ask question, Intelligent ones might I add. The greatest way of understanding something is to find out on your own, meaning do some research and really get to know your vehicle. Ok...........enough of my belligerent ranting.

you praise the 14b so much...and yet you do not run one....why?

Attack Eagle · 08-11-2006, 03:30 PM

Because he went to a 16g on the 2g FWD. 14b hit too hard and too fast.

However he has ridden in my 2g when it was on the t25-t28-14b and the evoIII. I liked the 14b best, and think he agrees. We live about 2 blocks from each other so he's seen me throw the car sideways at 50 on a dirt road under boost, throw it sideways in the rain, and basically drive that car like makinen. And he helped me do the t25 to BIG28 swap, the BIG28 to 14b, and 14b to 16g swap when I sold the car. Which means he's seen what the same car will do on all 4 turbos within 10k miles and one year.

SCR · 08-11-2006, 04:03 PM

Quote:

Originally Posted by Attack Eagle

Because he went to a 16g on the 2g FWD. 14b hit too hard and too fast.

However he has ridden in my 2g when it was on the t25-t28-14b and the evoIII. I liked the 14b best, and think he agrees. We live about 2 blocks from each other so he's seen me throw the car sideways at 50 on a dirt road under boost, throw it sideways in the rain, and basically drive that car like makinen. And he helped me do the t25 to BIG28 swap, the BIG28 to 14b, and 14b to 16g swap when I sold the car. Which means he's seen what the same car will do on all 4 turbos within 10k miles and one year.

so because the 16g has a better efficiency for his setup he chose it over the 14b...

Now please go back to my original post and read what I wrote about the 14b...what kind of turbo did I call it?

djsrs98 · 01-11-2007, 06:43 AM

Could you talk about internal and external wastegates, or maybe point me in the direction of a previous thread. I was just wondering, for a daily driver that won't be pushing the car real hard very much. What would be ideal. And I'm looking at 16g's, so actually I am pretty noob, so I don't even know if the 16g comes with a internal, so info would help.

Thanks alot

Attack Eagle · 01-11-2007, 08:56 AM

Wastegate: device that regulates turbine speed by diverting exhaust flow around the turbine

internal: a flapper in the turbine housing allows some of the exhaust to pass around the more restrictive turbine directly to the exhaust itself.

PRO:easy to use, convenient, requires no extra plumbing, tight packaging. Also isolates the actuator from exhaust heat.
CON: Under High exhaust flow conditions (think large displacement, or highboost high rpm scenarios) with low back pressure exhaust, the size of the internal wastegate, as well as the bends required to make it fit may not bypass enough exhaust around the turbine to prevent continued acceleration of the turbine. aka Boost creep. Also having a flapper that is too large may make regulating boost difficult.

External: a wastegate that is not inside the turbine housing. generally diverts either from a single runner, or from the collector, and may be external dump (ie to atmosphere) or returned to the exhaust downstream of the turbine.
NOTE: there are some who run an external after the normal internal opening by removing the flapper, but this seems pointless to me personally.

PRO: very accurate and efficient.
CON: packaging concerns, cost, and general complexity. Also generally less maintenace free than an internal would be.

MOST 16gs are internal wastegate, just stay away from the evo 3 GT (ie non MItsu, aka clone)if you ever want to run high boost. The oversized flapper can blow open due to being a bigger size than what the wastegate actuator's internal spring is designed to manage.

SCR · 01-11-2007, 01:10 PM

you generally don't need an external gate unless you are running a 20g or larger...and even then some people prefer internally gated 20g's.

I run a tial 38mm with open atmosphere dump on my td-06 20g and I love it

mosh350 · 04-03-2007, 12:34 AM

hey silvermitsu I just read your post on the turbos (which was awesome by the way) ok I have a t-28 hks turbo (I finally found what the hell I have I called them!!!!!) ok now I have the voodoo manual boost controller and I cannot get more than a 15 pound spike and a 13 pound peak and the damn knob is almost all the way down!!!! could it be a bad spring in the controller or is there some computer sensor in the way from it doing over that or what???? my buddy has a 3000gt and he said when he changed my turbo he said there is 2 vacume hoses one for the outtake fan and one for for the intake fan and he said his 3000gt only has one, and the boost controller works perfect in his car wiht the factory turbo!! I was wondering do you guys bypass one of those hoses when you raise the boost?? like I said I am kinda new at this and and my buddy is a really good mechanic when it comes to like good with a wrench but he doesn't know a whole lot about turbo logic really...but anyway basically I can't figure out why the boost controller is not raising me at all!!! you said the t-28 should hit 19psi right?? also you mentioned a out 190 pump and 550cc injectors but do i need that for 15-16 psi of boost?? my air-fuel guage shows me really rich still on redline. thanks for your help!!!!!

Silk90 · 04-03-2007, 01:41 AM

as for the internal external debate, i was extenal but i went back to internal for a bit more of a sleeper look but grinded down the devider between the o2 dumo and exhaust outlet on the turbo housing and o2 housing aswell to eliminate boost creep along with a nice lil 38mm flapper.

as for itty bitty turbo's they do their job w/ a nice tune and a good driver and what not. theres this guy locally who raced a TT350Z and spanked it and i was talking about it being the ****tiest damn 350 i ever damn saw being as the guy was only running a 16g but the guy was depp into 11's on it which goes to show ya their very capeable. and this is a daily drivin full interior 140k original miles car stock everything internal except clutch i would consider it a bolt on car but at the same time it's not.

as for youre boost problem i wiuld say you need a stiffer spring in there. unless for some reason the turbo is not capeable of that much boost or u have massive boost leaks that are leaking it all off and what not.

mosh350 · 04-03-2007, 04:38 AM

yea I guess I will try a stiffer spring I shouldn't have any boost leaks. also what is a good logger/programmer that isn't too expensive that will be my next purchase.

Attack Eagle · 04-03-2007, 01:35 PM

did you take the T out and install the MBC in it's place? or did you try to install it where teh BCS was with a return to the intake pipe and with out removing the t?

mosh350 · 04-03-2007, 02:21 PM

the t is still there should bypass the t and hook up mbc straight
to the wastegate and plug up the t?? also hks is confusing me they said my damn turbo is on a t25 flange but I have a t28 compression wheel on something about a t3 what the hell is that supposed to mean I don't get it,I wish I would of never bought that damn thing!!!

Attack Eagle · 04-03-2007, 03:04 PM

remove the T

connect the pressure source nipple on the turbo to the nipple on the bottom of the MBC.

Connect the side nipple back to the wastegate.
Cap the intake snorkel where the old ebc line returned post maf.

DO NOT DICONNECT THE EBC FROM THE ELECTRICAL CONNECTOR.

mosh350 · 04-03-2007, 10:28 PM

ooooohhh ok that makes sense thanks alot!!! yea I wanted to at least peek 15-16 until I get a logger and the proper fuel mods. so pretty much i can keep my motor stock and still run 19 safely if I have 190 fuel pump and 550cc??? also will the logger and programmer module get rid of that damn speed limiter?

Attack Eagle · 04-03-2007, 10:41 PM

no.
You don't need to remove it.

eclipserevolution · 04-03-2007, 11:12 PM

Wow... alot of time went into proving everyone else wrong. However, I'm better learned from the reading! Thanks to everyone who participated on this one.