Hot housing A/R upgrade question
 

I am currently running a T04E 57 trim .84 a/r (divided) p wheel. My question what power/back pressure upgrade would achieved by upgrading the hot housing to a 1.00a/r (divided).

Exhaust backpressure should go down.
Power band shifts higher in the RPM band.


-Ted

Ted

Is this upgrade worth it? the motor has stock ports and I run a high flow cat? Or a better question, what hot side a/r is best balanced for a street/track car at 13psi with the aforementioned turbo.

This is all completely dependent on where you want your powerband. If you enjoy having a little quicker spool, then you might want to retain your current housing. If you want to push some bigger numbers, but are willing to live with a little more lag, then try out the 1.00.

Are you running a divided turbo exhaust manifold?
If so, the 1.00 should be fine.

How quick does the 0.84 spool now?

The T04E "57" is a bit small for a 13B, IMO, so it should still spool rather quick even stepping up one size on the turbine A/R.


-Ted

Yes the exhaust manifold id divided, and does spool quickly with the .84. Why do you feel the "57" is sized small, my target power was 350hp @13psi. What turbo's would you feel would be more efficent for those hp parameters.

If I remember correctly, the "57" top efficiency is about 300hp @ 15psi.
I would step up to at least the "60" trim, as that should get your power goals.
...unless we're talking BHP at the flywheel?
My numbers are at the rear wheels on a DynoJet. :)


-Ted

Per the Turbonetics Compressor maps, "57 Trim" is good for 49 lbs/min, "60 Trim" 50 lbs/min. I am not sure the upgrade would be worth it unless I upgraded the hotside to 1.00 ar

Yes, those are maximum flow numbers...
So they would be applicable if you're running...about 30psi?

T04E "57"
http://not2fast.wryday.com/turbo/maps/t04e-57.gif

T04E "60"
http://not2fast.wryday.com/turbo/maps/t04e-60.gif


-Ted

Are you implying, at lower boost levels, lets say a bar, the 60 trim flows much higher than the 57 trim?

That is the point of having a larger compressor.

Yes.
Look at where the middle of all the concentric rings fall...
On the "60", it right around 2.00 or about 15psi.
On the "57", it's slightly higher.
This is where the turbo is running at it's most efficient.

Now, go down vertical, and the "57" is pumping slightly under 30 lb/min, while the "60" is doing a solid 30 lb/min.


-Ted

Thanks Much !!

My friend got 379 on pump gas at 1bar on that same turbo

57 or 60?


-Ted

I don't know, why don't you consult hitmans website then assert your internet dominance.