Ok i want to upgrade from my ching chang chong turbo. It lasted 1 year, i was impressed.. it was a t3/t4 .48 hot .63 cold 57 trim i believe...

After looking at all the comressor maps the to4e 50 trim will keep me at 78% efficiency at 7200 at both 10psi and 20 psi, (my track setting for thsi summer)... And should hit20 psi by 4646 rpm give or take a few...

My question is with the smaller trim size compared to my ching chang will i be making less horsepower per lb of boost, or will it be simillar..

Or comparing the to4e 50 trim to the to4e 60 trim the 60 trim would produce 78% efficency for both 10 and 20 psi, but wont hit 20psi till 5913, rpm..

Dose the 60 trim make more more power per psi than the 50 trim??

Another question is: for the 50 trim i calculated efficancy at 3600 rpms at 10psi as 72% but at 20psi its to the left of the surge limit line... dose that just mean turbo lag, and that it can not hit 20psi untill where the psi grid line crosses the surge line..

Im actually trying to select a proper turbo this time. was just going to go with the to4e60 cause it was cheaper, but got in to looking at the compressor charts, and i think the 50 trim is a better choice..

 

you cannot estimate how fast the turbo will spool by just looking at the compressor chart because this is very dependent of the turbine side specs.
what is your engine and your HP goal?

 

thats true/ but it can give ya a guestament... The turbo is going on a ls b18b... Not shooting for a horsepower number, just what ever i can get with 20psi.. only have a 2.5 bar map sensor..

Im just trying to determine if the 50 trim will make more power per Psi.. on the garrett charts the 50 trim flows better than the 57 trim, so im assuming that it can be aplied to the ching chang turbo casue well they dont flow as good as the Garretts to begine with...

 

someone posted a little while ago that when they measured their egay "57 trim" it was actually smaller, I think 50 or 54 or something along those lines

 

Why would anyone absolutely want to boost 20 psi
Why not setting a POWER GOAL and who cares how much boost is necessary to meet it?

THen, good news, turbos won't push significantly more or less hp / psi unless they are used outside of their efficiency range. once you have decided your HP goal, use the flow charts to determine a compressor that'S able of that goal with good efficiency.

 

jagojon3 hit the nail on the head... I can only boost bout 22 psi on my map, so i just want to max it out and be happy with what i get with the hp..

but this all will depend if i can figure out what the ---- is going on with my engine... burning some oil/ even though compression is good... so i need to do a leak down test, and see if that tells me something, and then i guess take a look at the valve seals, see if that helps... the smoke out the ehaust sucks and i dont like it but its only noticable when i start the engine, and when i sit at a light it smokes when i go, then dies off..


Figures buy $1200 in new parts for the spring, and the car starts being a bitch....