timg

I thought I'd post asking about differences in turbine wheels/housings.

How do these compare in flow, SPOOL, and power potential (given the same compressor wheel)?

It looks like the T4 P trim is larger physically than the GT35R turbine wheel, but smaller than the GT40R turbine wheel.

GT35R 0.82 a/r T4 flanged undivided housing - 62.3 mm exducer, 68 mm inducer

T4 P trim turbine with 0.68 a/r tangential undivided housing - 64.6 mm exducer, 74.2 mm inducer

GT40R 0.95 or 0.85 a/r T4 flanged divided housing - 68mm exducer, 77 mm inducer

Tim

Justin Olson

The GT35R turbine wheel will support flow levels similar to the P Trim turbine wheel.

Regards,
Justin

boostedeg22

i would like to know about this too

Arturbo

who has a turbine map of a p-trim to compare it to a GT35 turbine? Ive only seen the turbine map off of the gt35, but never a P-trim to claim it flows more. Not saying it does or doesnt, just dont have proof. I can say that by going from a GT35R T4 .68AR to a PT67R .68AR T4 I gained 120whp, but there are other stuf that changed other than the turbo for me to make that power.

Axel Foley

did it spool much slower? did you gain that power on the same boost?

Flr Power

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Arturbo &raquo;</TD></TR><TR><TD CLASS="quote">who has a turbine map of a p-trim to compare it to a GT35 turbine? Ive only seen the turbine map off of the gt35, but never a P-trim to claim it flows more. Not saying it does or doesnt, just dont have proof. I can say that by going from a GT35R T4 .68AR to a PT67R .68AR T4 I gained 120whp, but there are other stuf that changed other than the turbo for me to make that power. </TD></TR></TABLE>

Turbine can be made to flow more but it's efficiency in terms of mechanical energy transfer is what really matters.

Arturbo

Right, but what proof of a P-trim do we have?

Justin Olson

GT35R Turbine Wheel specs:
Turbine Major: 68.00mm
Turbine Minor: 61.58mm
Turbine Trim: 82

P trim Turbine Wheel specs:
Turbine Major: 74.17mm
Turbine Minor: 64.57mm
Turbine Trim: 76

GT40R Turbine Wheel Specs:
Turbine Major: 77.00mm
Turbine Minor: 68.00mm
Turbine Trim: 78

Justin Olson

GT4088R:


GT3582R:

Axel Foley

Arturbo-did it spool a lot slower with the pt67r, care to elaborate more?

Arturbo

spooled the same.

Justin, where are you getting at with the demensions of the wheels. I know what they are too but not sure what you are trying to get across. Have anything for the p-trim in print?

timg

Based on wheel size alone (ignoring design and efficiency), this is what I gather.

Spool:
GT35R&gt;P trim&gt;GT40R
Power:
GT40R&gt;P trim&gt;GT35R

The big question for me, I know the GT35R turbine would spool faster than the P trim and I've heard it flows about the same, but how does the P trim compare to the GT40R with spool (given the same compressor side- I know the GT40R would flow more and it is slightly larger- it appears to be about the same size as a Q trim T4 wheel)?

Tim

timg

Justin

Are you hinting that if the turbine map shows similar flow, spool will be very similar between a GT35R (large 1.06 a/r turbine housing) and GT40R (small 0.85 a/r turbine housing)?

Tim

B18c1turboedEK

iTrader: (1)

What about the GT3567R?

Justin Olson

I'm just trying to show as much info as I can find. From reading more last night, I found this about the P-trim vs gt35R:

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tony1 &raquo;</TD></TR><TR><TD CLASS="quote">
Basically, the 35R wheel will flow similar to the P trim wheel with the right combination of housings.</TD></TR></TABLE>

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Full-Race Geoff &raquo;</TD></TR><TR><TD CLASS="quote">
and it does so with a much smaller polar moment of inertia </TD></TR></TABLE>

https://honda-tech.com/zero...age=3