Garrett GT series nomenclature
10-23-2007, 07:04 PM
#1
Garrett GT series nomenclature I've been trying to choose a turbo for my Sea-Doo and am having trouble with their new GT series nomenclature.
Everyone else in the world designates turbo's by the compressor inducer diameter since that determines the ultimate hp limit due to choke.
Not only does Garrett not use this, they don't even list it for them.
I've read many times that the "trim" is the size of the minor diameter as a percent of the major diameter. However, with the Garrett GT42 for instance, they list it as a 94 mm compressor wheel with a 56 trim. That would make it a 53 mm inducer, which clearly isn't correct.
Specifically, I am looking in the GT22 - GT32 range. I want to normally make around 300 hp with the capability to go over 425.
Mike
Everyone else in the world designates turbo's by the compressor inducer diameter since that determines the ultimate hp limit due to choke.
Not only does Garrett not use this, they don't even list it for them.
I've read many times that the "trim" is the size of the minor diameter as a percent of the major diameter. However, with the Garrett GT42 for instance, they list it as a 94 mm compressor wheel with a 56 trim. That would make it a 53 mm inducer, which clearly isn't correct.
Specifically, I am looking in the GT22 - GT32 range. I want to normally make around 300 hp with the capability to go over 425.
Mike
10-23-2007, 07:44 PM
#3
I got it figured out. Garrett is using the trim to designate area ratio rather than diameter ratio.
So, the GT42 example above would be a 70 mm.
It looks like the GT32 is a perfect match to my needs.
It's a 1500 cc motor that makes peak power between 8100 and 8500 rpm. NA it makes around 160 hp. At 2/1 Pr (15 psi), it should be around 310 hp. At 28 lb/min and 2/1, the GT32 is 76% efficient.
Turn the wick up to 20 psi and I should be around 365 hp, where the GT32 is still 76% efficient.
Turn it up to 25 psi and it should make 420 hp and efficiency starts dropping but is still a respectable 73%.
Mike
So, the GT42 example above would be a 70 mm.
It looks like the GT32 is a perfect match to my needs.
It's a 1500 cc motor that makes peak power between 8100 and 8500 rpm. NA it makes around 160 hp. At 2/1 Pr (15 psi), it should be around 310 hp. At 28 lb/min and 2/1, the GT32 is 76% efficient.
Turn the wick up to 20 psi and I should be around 365 hp, where the GT32 is still 76% efficient.
Turn it up to 25 psi and it should make 420 hp and efficiency starts dropping but is still a respectable 73%.
Mike
10-23-2007, 07:53 PM
#4
Talk to Jose, we have alot of motorcycle customers and 4 wheeler guys going turbo. He can probably tell you what they use. I know they use GT stuff since they are the only ones making stuff that small.
10-23-2007, 07:58 PM
#5
DrTurbo, can you give me a price on a GT32, internal wastegate, along with a T3 flange, 6 bolt exhaust flange, oil inlet fittings, and oil outlet fittings?
BTW, I've worked with Jose on a few things before. He's kinda' hard to get in touch these days, though.
Thanks,
Mike
BTW, I've worked with Jose on a few things before. He's kinda' hard to get in touch these days, though.
Thanks,
Mike
10-23-2007, 08:45 PM
#7
DrTurbo, can you give me a price on a GT32, internal wastegate, along with a T3 flange, 6 bolt exhaust flange, oil inlet fittings, and oil outlet fittings?
BTW, I've worked with Jose on a few things before. He's kinda' hard to get in touch these days, though.
Thanks,
Mike
BTW, I've worked with Jose on a few things before. He's kinda' hard to get in touch these days, though.
Thanks,
Mike
Yeah he's tough to get ahold of nowadays. Everybody is always wanting to talk to him about turbos. Plus they are busy designing new units now for the "Big 3" manufactures....so that takes a toll as well. I will get with you tomm.
