$100T2

iTrader: (1)

There are TONS of turbos out there, and there is no definitive thread on just basic information. If somebody who is super knowledgeable about turbos could just chip in a bit here, it would totally help me (and others) out:

What is A/R, really? What does this ratio actually mean?

There are all sorts of sizes and designations of turbo, i.e., T-76, T-88, T-04, GT35/40... What do all these numbers, letters, etc really mean? I have seen some guys here running T-78s, others with GT28/35s, etc, etc, and other than it being a collection of letters and numbers, I don't understand what it really means. Same goes for T-04 turbos... What's the difference between T-04e, -04b, 04s?

Any other common questions that can be answered in one thread would be awesome. I know alot of this seems to be common knowledge, but it would just be great to have everything in one thread.

Thanks in advance
-$100

13BNUT

iTrader: (8)

Check out this thread
Lots of great info
This is what made me decide on the 60-1.

https://www.rx7club.com/showthread.p...ght=60-1+specs

$100T2

iTrader: (1)

I also want to know what the hell a 360 thrust bearing is, why a ball bearing turbo is better (or worse) than a non ball bearing turbo, etc..

Anybody???

razorback

ok i pretty sure ball bearing is better because of less force needed to turn the turbines. and its more efficient, less friction, etc.

rotorbrain

the ball bearing types allow for faster spool due to lower amounts of drag. the 360 deg thrust bearing is a safety measure for people boosting more than 15psi. im not exactly sure what exactly it looks like, but i can figure that it has bearing reinforcement at 360 degrees so that when the throttle is let off, the pulses in the exhaust and intake have protected ability to move against the blades. pushing the shaft back and forth and such. the forces applied at higher boost levels can be very destructive and a 360 deg thrust bearing is recommended at that level. . . however, its noted that if your BOV vents well enough to not give you compressor surge a 360deg thrust bearing isnt really needed.

paul

Zero R

iTrader: (1)

A/r is the cross sectional area of scroll, or volute,(inside the snail) divided by the radius of the housing. In general this means a smaller A/r will have better low speed response but not be able to hold the power level up high. For a larger A/r the opposite is true. Meaning it wont have as great low speed response(spool as most refer to it) but it will allow more power (due to greater flow) at the top end.

thedguy

http://www.beesandgoats.com/boostfaq/g2icturbo.html

It's geared twards integra's. But very informative, I've read thru the corky bell book and many other sites, and still learned something from this site.

I would like to see more on how the trim effects performance, and also how different compressor's work in different housings and same with the Turbines. Also glossary of terms that pretty much explains what all the terms in turbo terminology are and how they effect performance.