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Old 02-07-2020, 02:27 PM   #21
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Originally Posted by Smokem View Post
In this particular instance, the GT50 in a smaller housing than shown. Generally speaking the GT50, S400, and HX60 are all close in power production in most cases.
Kinda makes you wonder why some people spend $5k on an HX60 when $2500-$3000 on a S400 does close to the same job
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Old 02-07-2020, 06:42 PM   #22
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Originally Posted by bigstacks95 View Post
Kinda makes you wonder why some people spend $5k on an HX60 when $2500-$3000 on a S400 does close to the same job
Why would you spend that on a Hx60?

Go buy a box HX60 for $11-1300 and have a compressor wheel put in it of your choice.
 
Old 02-07-2020, 06:50 PM   #23
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Why would you spend that on a Hx60?



Go buy a box HX60 for $11-1300 and have a compressor wheel put in it of your choice.
Im talking about in the pulling world. Call around for a price on a 3.0 smooth inlet charger and let me know what you come up with!

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Old 02-07-2020, 08:49 PM   #24
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Im talking about in the pulling world. Call around for a price on a 3.0 smooth inlet charger and let me know what you come up with!

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That’s cause pullers are dumb when it comes to latest and greatest, when all that really changes is the cover and compressor wheel.
 
Old 02-07-2020, 09:06 PM   #25
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That’s cause pullers are dumb when it comes to latest and greatest, when all that really changes is the cover and compressor wheel.
I've never been the guy who absolutely has to have the latest and greatest, but I can see situations where people want the latest and greatest. If you're in a super competitive league with horsepower tracks, you're going to want every last single HP you can get. I agree, the pullers buying 3 different chargers every spring, dynoing them, then selling 2 of them is probably a silly idea.

A lot of it really does seem like a money grab, For example, back in the 2.6 class the HX60 was the hot ticket, then next was the GT40 or something when we went to 3.0 smooth. I remember asking turbo builders "why can't I just put a 3.0 cover on my HX60?" Well the drive pressuere, turbine, blah blah blah, not suited for the 3.0 aplication. So everyone bought a new turbo and sold the 2.6 chargers for pennies or turned them into paperweights. Fast forward a couple years here we are running the HX60's, GT55's, even S400's that we were running back then, but everyone had to buy new ones.

But us pullers keep falling for it so what the hell? Exploit it while the business is there!
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Old 02-07-2020, 09:09 PM   #26
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That’s cause pullers are dumb when it comes to latest and greatest, when all that really changes is the cover and compressor wheel.


Not entirely true, like most turbo shops they probably took the the OEM tag off and rivet a “Kustom” one on to justify the price.
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Flipping your mirrors up when you don't tow? That serves no purpose other than to let me know that you are a douche, from a distance.
 
Old 02-08-2020, 03:25 AM   #27
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Originally Posted by Smokem View Post
In this particular instance, the GT50 in a smaller housing than shown. Generally speaking the GT50, S400, and HX60 are all close in power production in most cases.
Was there HX60 with the smaller housing ?
 
Old 02-08-2020, 11:32 AM   #28
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Was there HX60 with the smaller housing ?
Yes.
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Old 02-08-2020, 12:09 PM   #29
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Again very different turbine designs yet similar results.

DPC2.jpg
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Old 02-08-2020, 03:59 PM   #30
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Again very different turbine designs yet similar results.

Attachment 73903
Was boost always same, or fueling, or how the comparison was done ? Similar compressor wheel or only same inducer size ?
 
Old 02-09-2020, 09:23 AM   #31
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Was boost always same, or fueling, or how the comparison was done ? Similar compressor wheel or only same inducer size ?
Boost comparison below, all compressors were similar design using the same inducer size, the GT50 and HX60 were the same design. Testing is done in a climate controlled surrounding on a negative sweep, no changes in fuel setting or timing advance, we look at both observed and corrected data and power between the three was within 3% overall.

BPC.jpg
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Last edited by Smokem; 02-09-2020 at 09:24 AM.
 
Old 02-09-2020, 11:46 AM   #32
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Boost comparison below, all compressors were similar design using the same inducer size, the GT50 and HX60 were the same design. Testing is done in a climate controlled surrounding on a negative sweep, no changes in fuel setting or timing advance, we look at both observed and corrected data and power between the three was within 3% overall.

Attachment 73907
boost/emp ratio between GT50 and HX60 is about the same, slightly better for GT50. At 4200 rpm. Did Holset make more power at lower rpm ?
 
Old 02-09-2020, 11:50 AM   #33
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boost/emp ratio between GT50 and HX60 is about the same, slightly better for GT50. At 4200 rpm. Did Holset make more power at lower rpm ?
No. And in this particular instance I will not be surprised if in the end the S400 isn't the best option.
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Old 02-09-2020, 12:13 PM   #34
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Personally I'm not a big fan of the HX60, but you cannot deny they are hard to beat in the drive pressure vs boost category. Be aware that even though it had the lowest drive, it did not make the most power.
Why am I not surprised?
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Old 02-09-2020, 01:04 PM   #35
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No. And in this particular instance I will not be surprised if in the end the S400 isn't the best option.
Is that some limited turbo class pulling engine ? Pressures are not very high and boost/emp ratio quite bad.
 
Old 02-09-2020, 11:57 PM   #36
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Just heard a rumor that FI is coming out with a turbine that fits the 88/96 dimensions but is way lighter and flows more.
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Old 02-10-2020, 01:48 PM   #37
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As usual, CompD for the win! Some great info in this thread
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Old 02-11-2020, 12:30 AM   #38
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Major vertical grid lines are 10hp.

THC.jpg
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Old 02-11-2020, 01:32 AM   #39
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Major vertical grid lines are 10hp.

Attachment 73913
It would be different if there was enough fuel to max them out. Or maybe compressor was maxed out so bigger turbine side does not help. But still these kind of tests are interesting.
 
Old 02-11-2020, 11:57 AM   #40
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It would be different if there was enough fuel to max them out. Or maybe compressor was maxed out so bigger turbine side does not help. But still these kind of tests are interesting.
Fuel quantity/rate certainly was not an issue. The point being as long as the turbine has sufficient power to run the compressor, altering the turbine flow by going to a different turbine housing had less than a 1% impact on power.
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