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[TWOLOUDnPROUD]

I have two turbo's one is a T04B H-3 and the other is TO4B V-Trim so which one should i use? Here the maps for both turbo's tell me what you think.

T04B H-3



T04B V-Trim

[dvst8r]

I say they are so close, it will make very little difference.

[reddevil]

Pictures please,

[TWOLOUDnPROUD]

Pictures please,

They look the same the only difference is the T04B H-3 has a bigger compressor wheel Inducer2.298  Exducer2.750 and the T04B V-Trim is Inducer2.160  Exducer2.750

[BoostForLife]

I would use the H-3 if you're not going to push any more boost than 15psi. .138 of an inch isn't much difference, but at 15psi it should show some gain.

[TWOLOUDnPROUD]

I would use the H-3 if you're not going to push any more boost than 15psi. .138 of an inch isn't much difference, but at 15psi it should show some gain.

I think i am going to use the V-Trim im doing a two stage boost control 8 psi low and 15 psi for high boost and the V-Trim maps looks good for that. The V-Trim flow rate is 48 lbs/min and the H-3 is 49 lbs/min not that much of a difference so i will use the V-Trim for now and try the H-3 later down the road.

[hotrex]

i used a t04b s trim on my build d series and it made 259 at 15 psi  back in the day.

the v trim is the one id use

[Joseph Davis]

I would use the H-3 if you're not going to push any more boost than 15psi. .138 of an inch isn't much difference, but at 15psi it should show some gain.

Uh, it's not .138 of an inch difference.  It's .48 in² difference, basically 12% bigger. 

[HiProfile]

For power, H-trim. Otherwise the V-trim will get very close, but have a larger powerband. H-trims are less common for a reason.

FYI you guys also have to factor in speed - radians/sec is the same, but inches/sec is higher on the H-trim, given the same shaft speed.