sciontc07

i saw someone selling a garrett 60/48 turbo....now im not purchasing it but my friend is and he asked me what the 60/48 is and i didnt know exactly....what is it? THANKS

Mightygnu

research!

Brett

you might want to double check and make sure that you have those numbers correct. i've never heard of that size turbo.

Mightygnu

I was thinking the same thing... but let him search around and figure out what his friend is really buying...

Syldrin

iTrader: (1)

ummmm might be selling 2 diffrent garrett turbos if he's giving thoes numbers

Syldrin

iTrader: (1)

i.e. a gt1548 and a gt2860

sciontc07

no seriously, i searched but there is nothing that says that; ive seen one site but i couldnt find information the person just typed that; ive found garrett 48/60 and garrett 60 & garrett 48; but this guy is selling him one turbo it clearly states Garrett 60/48 turbo (no shaft play) and what does the shaft play mean? THANKS

Syldrin

iTrader: (1)

the shaft is what the fins inside the housing are attacked to. if that move's left right up down that's shaft play and that is BAD

Syldrin

iTrader: (1)

after doing some digging this is all i've come up with.

http://cheapturbo.stores.yahoo.net/gat3w48ar.html

sciontc07

wow that may be it, i dont know....thanks alot...and thanks for explaining shaft play....well thats a good thing there is no shaft play....so is there any turbos that DO have shaft play, if its bad why do they have it?

Syldrin

iTrader: (1)

they're old and worn. and a 60-1 is WAY to big for a TC. you wouldn't get boost till like 9th gear with a 60-1

sciontc07

you've been really helpful...but the turbo is for a integra; thanks alot....but one last thing....what does the numbers mean and what does that mean....

i.e. 60 means 60mm whatever
60mm whatever means....it will move 60mm

sorry for the trouble im planning to boost my car and since my friend is getting it; i might be able to pick up some tips and terminology before hand;

thanks again!!!

Syldrin

iTrader: (1)

60 is the size of the turbo and a 60mm is to big for any 4 cylinder period.

sciontc07

haha thanks whats a good size...?whats the 48 mean?

dang sorry.....everytime i get an answer, a new question comes...

Syldrin

iTrader: (1)

i dunno what AR means. but it's the A/R.

a Gt3071 is a good turbo for a 4cylinder. or smaller

sciontc07

well thanks again, i think i should be done for now; you've been very helpful

Brett

im gonna have to dissagree with you there buddy.

sciontc07

why do you disagree; please explain i need as much info as i can retain

Brett

well first of all thats the turbo i have. secondly, people swear up and down that you need a turbo that reaches full boost at 3k rpm. this is BS. i had a zpi stage 1 kit, and yes it did spool very fast. so fast that i could not get my tires to catch untill late in 3rd gear. with a small turbo you do make alot of low end torque, but not as much top end hp. with a bigger turbo its reversed. you make more power up top. those that race there turbo tc's can tell you. once you launch you take your car to redline at 6250. then you shift to second. your rpm should not drop below 4500, if you can properly shift. then you shift into third. still your rpm should stay high...

i dont know about you but i would want my turbo to have its powerband in the rpm range that i stay in all the way down the track.

Brett

The exhaust and compressor housings on turbo chargers use a "scroll" design. For example, the exhaust housing's scroll is where the exhaust gasses enter the housing and are directed at the turbine. It's basically a smooth, tubular chamber that surrounds the turbine with a slot all the way around that acts as a nozzle to direct the exhaust gasses at the turbine. It's called a scroll because it slowly gets smaller in diameter as a goes around the turbine. This pressurizes the gasses, forcing them out of the slot/nozzle at a fast rate. In turbo-terms, the scroll is measured by the cross-sectional area of the scroll's "tube" (A) and the distance from the center of the "tube" to the turbine shaft (R). The values by themselves are not meaningful to the user and for the most part, R does not change much for different housings, but by dividing R into A, you get the A/R ratio. So, the A/R ratio of the exhaust housing refers to the size and shape of the scroll that is cast into the housing. It basically determines how restrictive the housing will be, versus how quickly the turbine will spin up. A lower A/R ratio (smaller scroll area, A) results in a more restrictive housing. This restriction speeds up the exhaust gasses and increases the amount that the gasses will expand. It's the speed and expansion of the gasses that causes the turbine to spin. So with a low A/R ratio, the turbine will spin up quicker, but as engine output and rpms increase, the restriction of the housing begins to build up too much back pressure on the engine, which reduces performance. A good rule of thumb for when there is too much back pressure is when the pressure in the exhaust manifold is more the half of the pressure in the cylinder. So basically, a larger A/R ratio will improve your engine's top end, while losing some mid range power and increasing turbo lag. A smaller A/R ratio will help the bottom and mid-range, but may effect the top end.