Holset HX35 944 turbine
02-23-2017, 09:46 PM
#46
Drifting
Street car primarily with frequent road course outings. I have all the supporting mods, just trying to figure out a turbo. I'd like to hit 450RWHP with good responsiveness. I'll have to make sure it's a t3 flange... it maybe a T4. I'll measure and photograph.
02-23-2017, 11:13 PM
#47
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Yea, shoot a couple pics. And put a tape measure next to it.
Honestly the whole point of the HX turbos is spool. The hx turbine wheels are a different breed. Most of the aftermarket turbos for the 944's are wheels that were made in the 80's. Yes, the hx wheel have been here for a wile too. The T31 ( stage 3 T3) has been around forever. A great wheel but older technology. The Stage 5 was a wheel designed for Johndeeer around the 80's. It a 61mm exducer. Good wheel but can be laggy under 400hp and 2.5L. And then the P trim. That sucker has been around for ever. Again all great wheels. The p trim is a 65mm compared to the hx40 64mm. The hx40 will out spool the P trim all day long and keep decent back pressure low. People get hung up on exducer numbers. In reality, The larger the inducer of the turbine wheel the more driving force it has to work on the compressor. So better spool and drive.
Honestly the whole point of the HX turbos is spool. The hx turbine wheels are a different breed. Most of the aftermarket turbos for the 944's are wheels that were made in the 80's. Yes, the hx wheel have been here for a wile too. The T31 ( stage 3 T3) has been around forever. A great wheel but older technology. The Stage 5 was a wheel designed for Johndeeer around the 80's. It a 61mm exducer. Good wheel but can be laggy under 400hp and 2.5L. And then the P trim. That sucker has been around for ever. Again all great wheels. The p trim is a 65mm compared to the hx40 64mm. The hx40 will out spool the P trim all day long and keep decent back pressure low. People get hung up on exducer numbers. In reality, The larger the inducer of the turbine wheel the more driving force it has to work on the compressor. So better spool and drive.
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02-24-2017, 06:18 PM
#52
Burning Brakes
Yea, shoot a couple pics. And put a tape measure next to it.
Honestly the whole point of the HX turbos is spool. The hx turbine wheels are a different breed. Most of the aftermarket turbos for the 944's are wheels that were made in the 80's. Yes, the hx wheel have been here for a wile too. The T31 ( stage 3 T3) has been around forever. A great wheel but older technology. The Stage 5 was a wheel designed for Johndeeer around the 80's. It a 61mm exducer. Good wheel but can be laggy under 400hp and 2.5L. And then the P trim. That sucker has been around for ever. Again all great wheels. The p trim is a 65mm compared to the hx40 64mm. The hx40 will out spool the P trim all day long and keep decent back pressure low. People get hung up on exducer numbers. In reality, The larger the inducer of the turbine wheel the more driving force it has to work on the compressor. So better spool and drive.
Honestly the whole point of the HX turbos is spool. The hx turbine wheels are a different breed. Most of the aftermarket turbos for the 944's are wheels that were made in the 80's. Yes, the hx wheel have been here for a wile too. The T31 ( stage 3 T3) has been around forever. A great wheel but older technology. The Stage 5 was a wheel designed for Johndeeer around the 80's. It a 61mm exducer. Good wheel but can be laggy under 400hp and 2.5L. And then the P trim. That sucker has been around for ever. Again all great wheels. The p trim is a 65mm compared to the hx40 64mm. The hx40 will out spool the P trim all day long and keep decent back pressure low. People get hung up on exducer numbers. In reality, The larger the inducer of the turbine wheel the more driving force it has to work on the compressor. So better spool and drive.
02-24-2017, 06:43 PM
#53
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Are you running the 8cm or 10cm. Just adding a larger turbine wheel will open up the flow alot. The t31 is going to choke up your top end. Its great on a 2.5L. But, to tight on a 3.0L
We can rebuild your turbocharger and add the T350 turbine wheel. Or I can machine it to an HX40. Both would still give good response. Also open up the top end power. Does your boost start to drop off in higher RPM? I bet that T31 wheel lights right up though,
We can rebuild your turbocharger and add the T350 turbine wheel. Or I can machine it to an HX40. Both would still give good response. Also open up the top end power. Does your boost start to drop off in higher RPM? I bet that T31 wheel lights right up though,
02-24-2017, 07:01 PM
#54
Burning Brakes
Are you running the 8cm or 10cm. Just adding a larger turbine wheel will open up the flow alot. The t31 is going to choke up your top end. Its great on a 2.5L. But, to tight on a 3.0L
We can rebuild your turbocharger and add the T350 turbine wheel. Or I can machine it to an HX40. Both would still give good response. Also open up the top end power. Does your boost start to drop off in higher RPM? I bet that T31 wheel lights right up though,
We can rebuild your turbocharger and add the T350 turbine wheel. Or I can machine it to an HX40. Both would still give good response. Also open up the top end power. Does your boost start to drop off in higher RPM? I bet that T31 wheel lights right up though,
I would rather sell my turbo complete and start fresh to be honest as I do not think the 60trim wheel is the best match for the 3.0 8v anyway.
Interested to see where you get to with this Holset bolt ons. I would trial fit the HX40 for you myself and dyno it but my car is having a full repaint at the moment so I do not have access to it for another month or two.
02-24-2017, 07:10 PM
#55
Drifting
02-26-2017, 05:26 PM
#57
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Tim how does the KKK style housing cope with these higher flowing turbine wheels? Do you machine it out for more flow so it is the same or similar to the volume of a Holset 12cm housing? I have a 3.0 8v and am interested in the type of turbo you are talking about i.e. bolt on but with a higher flowing hotside wheel but a relatively small compressor wheel. Currently running a t31 wheel with a T04e 60trim compressor but either the t31 wheel or the replica turbine housing (or both) is killing the top end. t350 wheel was one of the potential options but I felt the 61mm compressor wheel it is usually paired with was overkill for my power goals. Do you have any compressor maps for these Holset turbo options?
03-01-2017, 08:08 PM
#58
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03-02-2017, 12:42 PM
#59
Drifting
Here's the build thread:
http://straightpipe.ca/forums/showthread.php?t=2229
Turbos seem like an overwhelming subject area to me. I have the basic understanding, but I'm leaning heavily on the community to help me pick one. I'm still interested in the GTK we talked about if it becomes for sale.
The engine is:
Yet to be decided turbo
SFR front mount intercooler
Custom piping (yet to be built)
Some fat throttle body (maybe a 928, I can't identify it)
Hacked up customized 968 manifold
S2 cylinder head and cams
9:1 Arias pistons on Pauter rods
SFR stage 2 headers and crossover (T4 flange)
3" Lindsey downpipe (KKK flange)
Megasquirt 2
http://straightpipe.ca/forums/showthread.php?t=2229
Turbos seem like an overwhelming subject area to me. I have the basic understanding, but I'm leaning heavily on the community to help me pick one. I'm still interested in the GTK we talked about if it becomes for sale.
The engine is:
Yet to be decided turbo
SFR front mount intercooler
Custom piping (yet to be built)
Some fat throttle body (maybe a 928, I can't identify it)
Hacked up customized 968 manifold
S2 cylinder head and cams
9:1 Arias pistons on Pauter rods
SFR stage 2 headers and crossover (T4 flange)
3" Lindsey downpipe (KKK flange)
Megasquirt 2
03-02-2017, 10:59 PM
#60
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Well there are a couple way you can go. If you want a BorgWarner turbo, I would run and s200 with the T4 .83 hsg would run well on a 3.0L
The HX40 is also a goo choice. You could run that in a .68 to .81 T4 Vband.
The HX will still run water if you want it. The S200's usually don't have water.
If you want old school but good. A P trim in a .68 with a 60-1 or T04Z compressor. You can still get those in BB.
All of those turbos will do the 450whp. What boost are you trying to target. And what are you shifting at? The real question..... What budget are you shooting for????? all those turbos are top quality..
The HX40 is also a goo choice. You could run that in a .68 to .81 T4 Vband.
The HX will still run water if you want it. The S200's usually don't have water.
If you want old school but good. A P trim in a .68 with a 60-1 or T04Z compressor. You can still get those in BB.
All of those turbos will do the 450whp. What boost are you trying to target. And what are you shifting at? The real question..... What budget are you shooting for????? all those turbos are top quality..