Hiboost

iTrader: (9)

Very interesting compressor map there, gets me thinking about my upgrade options.

mike@synapse

i was talking about the turbine housings not the compressor housings. atp sells the turbo with the compressor cover without the turbine housing, Forced performance sells a DSM flanged turbine housing that will bolt up to the GTX3076r. the turbine housings for the gtx but not the compressor housings.

ScorpionT

iTrader: (1)

A standard DSM turbine housing wont fit the X manifold, if thats what you are saying.

Garrett builds GT series turbos with custom turbine and compressor housings to bolt up to the stock manifold, but these compressor housings arent available for the GTX just yet.

stokEd

iTrader: (3)

Any more updates on this turbo?

spdracerut

iTrader: (2)

Some dynos popping up with the GTX3076:

STI:
http://forums.nasioc.com/forums/show...2110277&page=4

S2000:
http://www.s2ki.com/forums/index.php...=788561&st=875

The difference between a GTX and regular GT on an Evo might be more pronounced because both the STI and S2k run less boost to make the same power. And one of the advantages of the new aero of the GTX wheel is higher pressure ratio capability.

Hiboost, I remember your car having the boost drop off with the regular GT as I'm guessing you were running into the choke flow of the wheel, ~55-57 lbs/min. So the GTX wheel will let you hold the boost and flow level up. On the STI comparison by Perrin, they didn't max out the GT wheel as it was still able to hold boost, so I'd guess you'd see a bigger WHP gain. Maybe 35-40whp?

Fractur3

iTrader: (12)

GTX all the way.

Hiboost

iTrader: (9)

yeah definitely the flow is starting to taper beyond 7k rpm, and If I do cams it and free up the engine it will taper even more as it reaches the flow limits of the turbo earlier. Upgrading to the GTX3076R would certainly give me more headroom with at most a 100-200 rpm spool penalty.

I'm considering this turbo as an upgrade option but also have to be realistic about the engine holding together with all these HP upgrades. My fuel system is being worked over shortly at STM and we'll decide on what direction to take within the next few weeks. Check out this overlay with the GT35 and GT30 series turbos on the same chart:



I'm thinking that at a pressure ration of close to 3.0 (~29 psi?) the GTX3076R will really shine. It will still do pretty good at around 26 psi which is a more road course friendly boost level. Either way I think it will raise the corrected airflow from 55 Lbs/min up to around 63 Lbs/min... maybe even 65 Lbs/min at 33 psi and almost match the efficiency of a GT35r.

If I try this new turbo it will likely be a GTX3076r with a Tial housing and v-band. I'll keep you guys updated once we figure out more!

Fractur3

iTrader: (12)

anyone care to explain how to convert the pressure ratio to psi?

UT_EvoX

Boost Pressure = Pressure Ratio * Atmospheric Pressure - Atmospheric Pressure

Conversely, Pressure Ratio = (Boost Pressure + Atmospheric Pressure) / Atmospheric Pressure

So, for a 3.0 Pressure Ratio at sea level (with an Atmospheric Pressure of approximately 14.7 psi), Boost Pressure would be 29.4 psi (3.0 * 14.7 - 14.7 = 29.4).

To calculate Pressure Ratio for a given boost pressure: for 25 psi at 4500 ft (12.5 psi Atmospheric Pressure), Pressure Ratio is 3.0 ( (25 + 12.5) / 12.5 = 3.0 ).

Fractur3

iTrader: (12)

sweetness. Thanks!

BADABING

If you want to be very accurate, the rule of thumb is to add an additional 1psi per 10psi boost, to account for pressure drop accross the intercooler. So on a 30psi car, you'll use 33psi as your 'boost pressure' value in the above equation.

Anthony Leung

i can't wait for a housing to come out since i don't want to go T3 for the sake of loosing spool + response on the track. Part of me just wants to give in and get the ETS kit but i'm trying to wait. Very curious what this will make a on 4b11T stock block and stock block w/cams ...

omarnasser

dude did u have the GTX or GT??? there is a huge diff!!!!!!!!!!!!!11

LapDance

This thread makes no sense to me what turbos's are we trying to compare?
FP black VS bolt on garret or t3/t4/vband gt/gtx3076? I mean if we're comparing the garret bolt on to the black then black wins hands down. If we're comparing the black to lets say and ets or ams kit or custom kit with a t3 gt/gtx3076r then the t3's will be superior along with a $5000 difference in cost. Oh and with that being said if the bolt on garret turbos were now being made with the gtx turbine it may be another story =P

01CBR929

iTrader: (8)

I started the thread to compare a full turbo kit wth the GTX in relation the a fp black. I have been tempted to do both but I tihnk I'm going to get the ets kit with the gtx after I sell a car. In time for spring :-)