wazzurp

Garrett T3/T60 hybrid turbo. .48 exhaust A/R, .72 intake A/R.

Would this turbo be any good for a mild setup on our cars.

AirborneS2K

no. Exhaust A/R is way too small, you'd be wasting your $$ with that turbo. Might as well go supercharger.

flitcrma

Why would you say this?

According to http://cheapturbo.stores.yahoo.net/gat3w48ar.html it can make 525 horsepower.

Soul Coughing

thats basically the same turbo i have, only my hotside is .82. I will let you know what i make on high boost when i get my car tuned!

flitcrma

If memory serves me correctly, doesn't the a/r's deal with how quickly the turbo will spool, with a minor loss in how many cfm's it will flow on the exhaust side?

Soul Coughing

thats the size of the exhaust housing. Which has an influence on how many CFM's are able to be made.

"The higher the number, the higher on the rev range the turbo will spool. Also the flow capacity of turbine is increased and less flow is wastegated, there is less engine backpressure, and engine volumetric efficiency is increased resulting in more overall power. The .48 A/R is able to create the pressure differential at a much lower engine rpm, giving the compressor ability to make its maximum rpm speed sooner. As the engine rpm climbs, the pressure differential is lowered due to the physical volume of the housing size becoming a restriction on the post turbine side. As the housing size is increased, it take greater engine rpm speed (greater exhaust energy) to spool up the turbine, but the pressure differential is less effected by the physical volume of the housing. If you are after maximum midrange gains smaller housings are essentially, if top end gains are essential larger housing are essential. Selecting the powerband of the engine is essentially dictacted through the housing size, and the turbine physical characterisitics."

taken from http://www.evans-tuning.com/techarticle_turbines.html

flitcrma

Exactly, which means that a smaller exhaust (turbine) a/r would do this at a slightly greater extent and the wastegate would dump the excess sooner.

I'm just trying to figure out why somebody is saying that the turbo is 'too small' without providing any reasoning other than maybe to toot their own horn.

AndyFloyd

it would spool fairly fast but would drop off after 7k since the .48 is just too restrictive. At least go with a .63 turbine.

Soul Coughing

what that paragraph was meant to explain was that a .48, in comparison to a .63 or .82 would spool much quicker (hit its rpm range efficiency) but would then hurt VE due to the large exhaust restriction of the smaller housing!

You can give it a shot, and have a quick spooling turbo that will definitely become a hindrance to power at the top end of the rev range. I would love to see the dyno of your setup!

AirborneS2K

I gave that advice b/c Inline Pro first started me out w/ a .63 a/r turbine and I made ~310whp @ 18 psi...straight shitty son, I could only imagine that a .48 would net you the same power. I have a .83 a/r now and just made over 450whp on 93 octane and 18 psi (check my thread). So that turbo would be a waste in my opinion, you'd be better off going supercharged.