Here is my current problem situation! I hope someone can give me some answers.
I have a T25 from a tgp which needed a rebuild. so I got my kit and proceeded with the process. When using my puller to remove my turbine the brim of the centersection decided to give before the shaft. "Bummer........I just broke my freakin turbo!" O well, after throwing some wrenches at people I calmed down and starting searching for some turbos. I found two (what I was Told) were two Garrett T25's from a 300zx. both in excellent condition. I met with the guy and compared my turbo to assure they would work. They looked the same other then the compressor and exhaust housings. "No big deal I say", "Im using my compressor and exhaust housings off my T25 anyway, all I need is the center section". either way even if they werent going to work, hell for a $100 I didnt care. So I bought them and proceeded to dismantle the turbos, rebuilt one of the centersections I planed on using. Decided that the turbines from the 300zx turbo where in better condition so I used them instead of the ones from my T25. cleaned off my housings and slapped it back together. I noticed one thing, the exhaust turbine wheel didnt look right in my exhaust housing, seemed too small and indeed it was! Crap.......I figure! soo I dismantled it again to see if the compressor turbine was the same size, it was. I did some research and come to my surprise I had purchased two garrett T2209. The only difference I can see from a T2 and A T25 is the compressor and exhuast housings allong with the exhaust turbine wheel. Which leads to my questions
1. Q:How much does the balance of the turbine wheels play in the performance of the turbo?
I really dont like my compressor wheel from my turbo and really would like to use the one from the T2.
Could I use the compressor wheel from the T2 in combination with the exhaust turbine from the T25? Would balance really be affected?
2. Q: Why is the oil drain so large on the T25? will reducing its size really make a difference in lubrication?
Some people might suggest I just use the exhaust housing from the T2 in stead of swapping the the turbine. I would except that I dont have the down pipe for the T2 exhaust housing, and Id rather have the larger exhaust turbine.
Let me know what you can fellas. Thanks
I am no expert on turbos. But I would have to say that the turbos that GM use seem to always have a large diameter oil inlet/outlet. I think this is because GM's usually have higher oil pressre rates. And you dont want the oil pressure to blow out the seals off the turbo, so better to have them flow better.
At least thats my opinion..
Well, I dont think it would blow out the seals, there all metal. Thanks tho.
Quote from: gtzberetta on February 18, 2007, 08:32:28 PM
Well, I dont think it would blow out the seals, there all metal. Thanks tho.
Turbo seals DO blow. ;)
Quote from: gtzberetta on February 18, 2007, 08:32:28 PM
Well, I dont think it would blow out the seals, there all metal. Thanks tho.
I coulda sworn there were some 0-rings or some other such thing in there..
1.) HUGE! You have to consider that the turbine and compressor wheels are spinning somewhere in the range of 110,000 and 125,000 RPM. Even .01 of a gram will reduce the life of the turbo seals.
2.) Most likely because most turbo manufacturers (not GM's design) are a big fan of gravity drain. If you have a pressureized system and a minor clog happens it will force feed oil into the exhaust. As we have seen numerous times that with just the slightest inner swelling of the drain line will cause smoke...imagine if it was a small orifice that was under full pressure. On a gasser it only results in smoke...on a diesel it results in a 5000RPM runaway that will completely consume the oil in the system until it is gone and the motor locks to stop it. :icon_eek:
Well I guess ill have to use my turbines, whats the best solution to use when trying to remove coked up oil from a turbine wheel.
im trying choke cleaner but doesnt seem to be strong enough