TURBO size arguement!

[sunnys14]

i just got into an arguement with my friend's roommate about turbo sizes. he is saying that my .50AR compressor .63AR turbine 57trim t04E turbo is totally INEFFICIENT! he was bitching and saying why am i so "stupid" and didnt swap in a .60AR compressor?? wouldnt swapping in a bigger compressor size make me spool even later? he said i will gain more HP and max HP matters most in street racing. this guy is a moron seriously ... making full boost near redline is just undriveable to me..

[SeVa-S13]

What matters most is trim. If anything you should get a 50 trim to replace that 57. You'd spool sooner and probly make more power to boot.

[sunnys14]

i plan on pushing that turbo to 1bar. is that out of its efficiency range?

[SeVa-S13]

Oh no, the 57 trim can actually flow a few more lb/min than the 50 trim, in my mind its only advantage. The reason I prefer the 50 trim better is that on our engines, it's a higher efficiency at most desirable boost levels than the 57 trim is, but 15psi is not even really near the choke point.

[hannibal]

I have a hard time understanding how comp AR affects spool. I kow exhaust AR has a much bigger effect. It seems like you'd want the smallest comp AR possible. Its not like it would choke the flow like the turbine housing could.

[SeVa-S13]

Both compressor and turbine are trying to flow air, and the more the room the easier it's going to be. Now of course a bigger housing is gunna mean later spool but too small and it's like trying to fill a pool through a straw, no matter the wheel trim.

[:: orion ::]

That guy's a moron.

(...and compressor A/R is almost meaningless).

The 50-trim IS a better choice (more efficient over a wider range of boost pressures), but the 57-trim is a good choice as well.

For 1bar, the 50-trim would land you in the 76% range at redline...and the 57 will put you at 70% at redline. So you can see the 50 is better, but not enough to swap turbos.

If you were to buy new, then buy a 50. But don't worry...I run a 57 and make good power...but I'll switch to a 50-trim when it's time to upgrade.

- Brian

[Pencil Shavings]

anyone have a good site to learn all these terms and what exactly they mean?

[SeVa-S13]

anyone have a good site to learn all these terms and what exactly they mean?

Honestly...try the 3rd thread from the top on this very forum...the one that says "LOOK HERE FIRST"

[sunnys14]

he keeps saying that trim size doesnt matter... he is now arguing that compressor AR is what matters most... what a retard!

[wild_maxx]

well kick him in the nuts and tell him to learn something about turbo's before he starts an argument. good luck

[SeVa-S13]

For those unaware, winning an argument with an idiot is very slim. Just stop. BTW, what does this turbo genius drive and can you make a mockery of it?

[sunnys14]

he said hes been building NA and turbo cars from 4cyl hondas to rotaries for the last 3 years. hes probably a 17year old first year college student... i wonder how much "building" hes been doing...
Modified by sunnys14 at 10:45 AM 9/15/2005

[nissanfanatic]

He's a moron. Plot a compressor map and see how he argues with that. Seriously.... Mr. Honda god is gonna save all of us KA-T guys from what we know to be true. He needs some time alone with about five books.

[hannibal]

anyone have a good site to learn all these terms and what exactly they mean?

Garrett's site has some good info.Turbo 101 is a good intro. Turbo 102 gets into wheel trim and housing A/R

[C-Kwik]

i just got into an arguement with my friend's roommate about turbo sizes. he is saying that my .50AR compressor .63AR turbine 57trim t04E turbo is totally INEFFICIENT! he was bitching and saying why am i so "stupid" and didnt swap in a .60AR compressor?? wouldnt swapping in a bigger compressor size make me spool even later? he said i will gain more HP and max HP matters most in street racing. this guy is a moron seriously ... making full boost near redline is just undriveable to me..

Orion touched on the points I would make so I'll just say this. Ask him why A/R is not even mentioned in a compressor map. He probably has no idea how to plot one and has spent little time actually looking at them. Secondly, max HP is not all that matters. The average HP in the most widely used portion of the powerband does.

[nissanfanatic]

Here is an exerpt from Maximum boost:-->Click here<--