vettejoe

Hello again I am now looking for turbos to put on my 80 Corvette. What car or cars are best to steal the turbo's off of. I also need the flanges and brackets. Any help would be appreciated. and any thing to be aware of or to look for on the turbo's before i buy them would also be nice thank Guys. Joe

tranceminister

What engine do you have that you'll be turbo'ing? will it be a twin setup ( I assume)?

miss-piggy

twin .48/.60's. thats assuming you are running a 305 or bigger. if you want you can get .42/.48's but i think the .48/.60 might be a better choice.

vettejoe

yes it will be a twin turbo setup. The engine is a chevy 350 with dual 2 1/4 exhuast pipes. I am new to the turbo realm so really do not know what .48/.60 means and what type of cars they are on. So please any help would be nice. Thank you guys Joe

tranceminister

The .48/.60 turbo bigwig speaks of is a T3 turbo. It's the next largest size T3 asside from the Super 60. I beleibe that one can be found on Mustang SVO's (automatics I beleive). You can also find T3's on Thunderbirds, Nissan 300zx, and many more I'm sure.
I got my T3 .48/.60 on Ebay. It's pretty easy to find turbo's there if you don't know where to look in the junkyard. Just make sure that the turbo's your getting are in good shape.

vettejoe

Hey again what does .48/.60 means someone wrote em and said a/r ok what does that mean. not to be stupid but what does that mean. thanks again Joe

typert

I have most of the flanges you need including the LT1

PureCRXtasy

Here is a good description. This is from a website, but is quoted directly from Maximum Boost by Corky Bell (The Turbo Bible ) You want this book. Trust me.. get it soon.

A/R Ratio (Area/Radius Ratio)

" While basic turbine size reflects a measure of the turbine's flow capability, the A/R ratio is a method of fine tuning between basic sizes. To easily grasp the idea of an A/R ratio, imagine the turbine housing as nothing more than a cone wrapped around a shaft to look like a snail. Unwrap the cone and cut of the small end a short distance from the tip. The hole in the end of the cone is the discharge area. The area of this hole is the 'A' of the A/R ratio. The size of the hole is significant, as it determines the velocity with which exhaust gases exit the turbine scroll and enter the turbine blades. For any given rate of flow, a smaller exit will require that the gases flow faster. Thus, the area of the exit is important in controlling the velocity of the gases as they enter the turbine blades. This velocity has much to do with controlling the actual speed of the turbine. It is necessary to keep in mind that the area of the exit is the controlling factor in the bad side-effect of exhaust gas back pressure and, thus, reversion into the combustion chambers.

The 'R' of the A/R ratio is the distance from the center of the section area in the cone to the center of the turbine shaft. All 'A's divided by their respective 'R's will give the same dividend.

The 'R' also has a strong influence in controlling turbine speed. If one imagines the turbine blade tips will travel about as fast as the gas is moving when it enters the tip area, it is easy to see that a smaller 'R' will impart a higher rotating speed to the turbine."

In short, all other things being equal, the smaller the A/R the less lag there will be, but the turbo may not be able to produce power at higher RPMs. A larger A/R will produce more lag but have a lot of top end power.