turbo knowledge
Hey guys hows it going. I'm going to step up to the plate. My spelling is not the best but here goes.
The whole garret turbo explanations. First the different in the bearings as you stated was, what is a 270 or 360 race bearing or ball bearings?
Well inside of the center section of a turbo there are bronze bushings that the turbo shaft spins extremely fast with oil. In older and more common the bearings are 270 degrees they are not a full round bearing which can make shaft play more commom in turbos. In some of the newer turbos like say the precision 60-1 you can get a with 260 bearing which are completely a full circle allowing for longer lasting and faster spooling turbos. Next we have dual ball bearings which are found in turbos like the gt35r and gt30r as examples. Theses turbos have real ball bearing where the tolerances and perfect and deliever great spool time. I mean good. So there is the major differences in the turbo center section bearing types.
next question is what is a trim as many guys talk about around here.
Many garret turbos are sized in trim. Trim is nothing special expect a big math calculation of the inducer/exducer times and divided by more numbers that the average person will not have to worry about in there life time. As you read about these turbos usually a 60 trim is bigger than a 50 trim. A 50 trim TO4B will get you to that 400 hp mark or can you handle the 60 trim which pushes enough air to support the big number on the dyno. But can you handle or do you want bigger?
Next you ask why to port a turbo inlet out let both?
well here goes a shot at what I think. well on the exhaust housing of a turbo you need a certain amount of exhaust gas pressure to make your turbo spin fast enough to create boost which we all love so much. So us power driven peopletake our turbos apart and start to port them to get more exhaust gas in the inlet of that turbo to make it spin sooner because you are putting more gas in that area of that turbo. Then people port the outlet of the turbo to get that extra gas back out and into your big 3.0 inch exhaust I HOPE U Have. well next many people port the wastgate outlet to get the bypassed air out to your exhaust and not to spin that exhaust wheel any faster at high rpms and that right there explains the 16g boost creep, but why would you put a big bolt on, on or a garret on with out a nice shiny tail 38 or 44? now that makes sense in my would and I now money is the problem with many people. I now we dont have any.
Next you state what is a T3 turbo or t3/t4 or a straight monster t4?
Well a t3 garret turbo has been around for many many years. it can be found on a 84-86 Nissan 300zx with a .63a/r or even older saab turbos. A t/3 means the compressor size of the turbo.Most I say most t3 are too small for our cars. That is why you see many people running t3/t4 hybrids which combine a t3 exhaust housing which a big t4 compressor housing to flow some serious air to feed our monster motors we are trying build. a straight t4 usually a monster exhaust housing in lam-mans terms which are used on Supras and some DSM but they require more exhaust gas pressure to spin and 90 percent of us dont have this much gas to blow out on these things.
Next maybe one of the most important things is choosing a turbo which I'm only going to touch briefly on because my hands are getting very tried by now and no I'm not the best typer in the world, and I sit here looking at my DSM in the drive way and want to go get on that 60-1 that lurks under the hood of that beast.
This is where the whole A/R comes in to play and the amount of air a turbo can make, the surge limit of the turbo, make boost, flow charts and all of the other good things that us DSM fans need to now about. So hear goes my best shot at this and I wont get to complicated. Where first we look at the 14b stock for most an upgrade for other. Yes it does 20pounds of amazing boost, and the exhaust housing cracks due to the heat that is trapped due to the internal waste gate design. It has a 06 exhaust housing which means the exhaust size, while the more common upgrade is the 16g which flows alot more air will push over 20psi of oh so loving boost. But you have to remember that the for the most apart that the exhaust housing and the intake side of the turbo are in haromy. By which I mean is the the turbo pushes a certain amount of air into the motor and the exhaust housing is the right size to flow the exhaust gas back out. That is way a b16g have a 7cm exhaust housing, just porting a 6cm exhausting wont flow as much as a 6cm. Think of it as funnel. put more and more water in it but you only get so much out. Increase that bottom hole size and now the funnel breathes which means your motor can breath now.
Part 1 is over I need to go get food I will continue with this in a minute or so.
so just be patient it coming
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