Garrett turbo

[redlined67]

Is Garrett a good turbo? The model is the T25BB. I havent heard of this name before so I thought Id try to find out if it is a good turbo.

and, How do you adjust the boost on a turbe. If the manufacturer sais it does 6 psi can that be adjusted. Is this done through the blow off valve or on the trubo itself.

Thanks for the info.

[contrapunk]

Yes Garett is a fine turbo. The same turbo's that were used on stock Mitsubishi Eclipse GS-T's and AWD GSX's(I recently sold my GSX), and Car & Driver called the DSM Garett turbo's "a decade ahead of other manufacturers".

Every turbochargers boost is controlled in the same way, boost pressure, usually from the manifold, is sent through a signal line, where it reaches the wastegate actuator and overcomes the spring load to open the wastegate. So if your actuator spring load is 5 pounds, it will take 5 pounds of boost in order to open the wastegate. There is usuall a screw with a spring around it on the wastegate actuator itself, by adjusting the screw you can manually tune the boost required to open the actuator valve.

In order to run higher boost pressure, a boost controller will create a controlled leak in the signal line. This way, the wastegate only ever sees the regular 5 psi, regardless of boost pressure. So if your wastegates spring load is 5 pounds, and your boost controller was set at 7 psi, your boost controller would bleed off 2 psi from the signal line. This doesn't change the amount of pressure it takes to open the wastegate, but instead sends 5 psi to the wastegate instead of the 7 that is in your manifold. So if you wanted to run 14 psi, and the wastegate opened at 5, the boost controller would bleed off 9 psi before it reaches the wastegate. Basically, boost controllers work by hiding the extra boost from your wastegate. Manual and electronic boost controllers work the same way, by bleeding off boost in the signal line.

[redlined67]

Thanks for the info. and good description. Im lookin at getting a turbo but im not real shure how all the components work for them, or how to control a turbo. Thanks for explaining.

[grandizzle]

Originally posted by redlined67
Thanks for the info. and good description. Im lookin at getting a turbo but im not real shure how all the components work for them, or how to control a turbo. Thanks for explaining.

i suggest you first read up on turbo setups and all the things that go in conjunction with them.....

realize you have to majorly upgrade fuel management, you have to run 93 octane or better ALL THE TIME if you have moderate/high boost, and turbo engines require mroe "care", by that i mean more frequent check ups to make sure all is in order.....something as tiny as a miniscule fuel leak could be the end ofr the entire motor.

its alos a lot of money, its not just the turbo kit, its fuel management, guages, installations, etc....just find smoe good articles on it and read read read.

[contrapunk]

Originally posted by redlined67
Thanks for the info. and good description. Im lookin at getting a turbo but im not real shure how all the components work for them, or how to control a turbo. Thanks for explaining.

No problem, I'm just happy I could offer some sound advice! But grandizzle was right, it's going to be a lot of effort and a lot of maintenance. A turbo kit is a good start but that's all it is, a start.

You will more than likely need bigger fuel injectors, higher flowing fuel pump, maybe even lower compression pistons, 93+ octane gas ALL of the time, more frequent oil changes (that model Garett turbo requires an oil line to be run to it straight from your oil pan for lubrication, I believe it has its own mechanical pump to get the flow moving - I know this because a lot of N/A Eclipse owners in my former club were putting the Garett's on), constant engine monitoring via an elaborate gauge setup and then some.

That may seem excessive and it just might be for what you're looking for. If you're planning on staying between 5 - 8 psi I think you'll probably be fine with just higher octane gas and a better fuel system, but if it were me, I'd go all out, sticking a turbo on an engine not designed for one is just a scary thought for me. In my day, I had seen 2 Eagle Talon ESi's and 3 Eclipse GS's need major engine work after bolting on a turbo kit and not making sure everything else is in order first.

Good luck though, and I hope everything works out!

[redlined67]

Do you have any ideas were I might find some articles or info to read up on. I know it is a high maintainance item. The car already requires 93 octane so Im not worried about that. Im looking to build a car so all the parts that go with is fine. I built a couple chevellesalready and would like to try the sport compact scene and I wasnt shure how the turbo setup would work. Thanks.

[contrapunk]

Back when I was buying all my parts for my GSX I pretty much bought everything from http://www.dsm-performance.com/ - great site with good prices, and even though it says "DSM Performance", turbo's are pretty universal.

As far as stuff to read for research and understanding, well here's the site that helped me bolt on an ETA12 turbo, and figure out EVERYTHING that I needed to do in order to make it work right. - http://www.dsm.org/

It's all based around Mitsubishi Eclipse's with the 4g63 engine, however, the knowledge about turbo's, turbo components, and other engine modification requirements is why I'm pointing you there.

Again, good luck!