PTUNING S2000 Turbo System (Pics, Dyno, Pricing)
Joined: Jun 2008
Posts: 1,593
Likes: 75
Making some very rough estimates, a stock s2000 makes 200whp. If you want to double that to 400whp, you need to double the air density, so a pressue ratio of 2.0. Using the rough guideline of 10whp per 1 lb/min of mass flow, 400whp = 40 lbs/min of mass flow.
Looking at the GT3076 map, that's around 74%-75% efficiency. On the GTX3076, it's 77%-78%. A GTX3071 is 75%.
If we want 500whp, ~50 lbs/min, 2.5 PR (~22psi at the turbo outlet, ~18-19psi at the manifold). GT3076 = ~68%, GTX3076 = 75%, GTX3071 = ~71%. So this is where the big gains are. And the GTX3071 is still better than the regular 3076.
The really really big gains for the GTX3076 over the regular GT will be in the 55+ lbs/min range.
Looking at the GT3076 map, that's around 74%-75% efficiency. On the GTX3076, it's 77%-78%. A GTX3071 is 75%.
If we want 500whp, ~50 lbs/min, 2.5 PR (~22psi at the turbo outlet, ~18-19psi at the manifold). GT3076 = ~68%, GTX3076 = 75%, GTX3071 = ~71%. So this is where the big gains are. And the GTX3071 is still better than the regular 3076.
The really really big gains for the GTX3076 over the regular GT will be in the 55+ lbs/min range.
Joined: Feb 2008
Posts: 3,964
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From: USA
Originally Posted by spdracerut,Nov 18 2010, 11:44 AM
Making some very rough estimates, a stock s2000 makes 200whp. If you want to double that to 400whp, you need to double the air density, so a pressue ratio of 2.0. Using the rough guideline of 10whp per 1 lb/min of mass flow, 400whp = 40 lbs/min of mass flow.
Looking at the GT3076 map, that's around 74%-75% efficiency. On the GTX3076, it's 77%-78%. A GTX3071 is 75%.
If we want 500whp, ~50 lbs/min, 2.5 PR (~22psi at the turbo outlet, ~18-19psi at the manifold). GT3076 = ~68%, GTX3076 = 75%, GTX3071 = ~71%. So this is where the big gains are. And the GTX3071 is still better than the regular 3076.
The really really big gains for the GTX3076 over the regular GT will be in the 55+ lbs/min range.
Looking at the GT3076 map, that's around 74%-75% efficiency. On the GTX3076, it's 77%-78%. A GTX3071 is 75%.
If we want 500whp, ~50 lbs/min, 2.5 PR (~22psi at the turbo outlet, ~18-19psi at the manifold). GT3076 = ~68%, GTX3076 = 75%, GTX3071 = ~71%. So this is where the big gains are. And the GTX3071 is still better than the regular 3076.
The really really big gains for the GTX3076 over the regular GT will be in the 55+ lbs/min range.
You Got It
Registered User
Joined: Jul 2006
Posts: 3,504
Likes: 1
From: Bergen County, NJ
Originally Posted by dsddcd,Nov 17 2010, 01:54 PM
Okay, lets all just wait and see if we can hold the boost we want with the kit. If it does become a problem then we can start a new thread, until then it is only speculation so please lets move on.
Lets move on SlowTeg
Joined: Jul 2007
Posts: 28,386
Likes: 107
From: Right Here.
Originally Posted by SlowTeg,Nov 18 2010, 07:18 PM
"Control over power? That`s what the throttle is for. "
Have you ever tried to regulate boost with your right foot from 7-12psi while focusing on racing? The reality is that your suggestion of "that's what the throttle is for" is very silly.
metros,
I think the inability to run a kit due to the manifold not being able to run lower boost is in fact a "flaw" with the kit, and I can understand why some would be a little disappointed in this fact. As others said, some of us looking at a kit are looking for something between a greddy and a Mase kit. Perhaps with a slightly smaller turbo though it would help lessen the creeping problem. We'll have to see..
Have you ever tried to regulate boost with your right foot from 7-12psi while focusing on racing? The reality is that your suggestion of "that's what the throttle is for" is very silly.
metros,
I think the inability to run a kit due to the manifold not being able to run lower boost is in fact a "flaw" with the kit, and I can understand why some would be a little disappointed in this fact. As others said, some of us looking at a kit are looking for something between a greddy and a Mase kit. Perhaps with a slightly smaller turbo though it would help lessen the creeping problem. We'll have to see..
Do 500hp+ Z06 corvettes and vipers have a boost by gear option on the race track? I'm not so savvy in this.
From what I've been told, you can only regulate the power with the throttle, please correct me if i'm wrong...thanks!
Joined: Jul 2007
Posts: 28,386
Likes: 107
From: Right Here.
Originally Posted by spdracerut,Nov 17 2010, 11:05 PM
I just think people need to be very clear on what to expect. I'd hate for someone to buy a GTX3076 instead of a regular GT3076 expecting some huge power gain if all the turbo will ever see is 11-12psi (flow rate of very roughly 40lbs/min).
However, it's very clear if you start plotting out to 18+psi (flow rate of 50+ lbs/min), the GTX will definitely make more power than the regular GT because it will be more efficient.
However, it's very clear if you start plotting out to 18+psi (flow rate of 50+ lbs/min), the GTX will definitely make more power than the regular GT because it will be more efficient.
Joined: Jul 2007
Posts: 28,386
Likes: 107
From: Right Here.
Originally Posted by spdracerut,Nov 18 2010, 12:44 PM
Making some very rough estimates, a stock s2000 makes 200whp. If you want to double that to 400whp, you need to double the air density, so a pressue ratio of 2.0. Using the rough guideline of 10whp per 1 lb/min of mass flow, 400whp = 40 lbs/min of mass flow.
Looking at the GT3076 map, that's around 74%-75% efficiency. On the GTX3076, it's 77%-78%. A GTX3071 is 75%.
If we want 500whp, ~50 lbs/min, 2.5 PR (~22psi at the turbo outlet, ~18-19psi at the manifold). GT3076 = ~68%, GTX3076 = 75%, GTX3071 = ~71%. So this is where the big gains are. And the GTX3071 is still better than the regular 3076.
The really really big gains for the GTX3076 over the regular GT will be in the 55+ lbs/min range.
Looking at the GT3076 map, that's around 74%-75% efficiency. On the GTX3076, it's 77%-78%. A GTX3071 is 75%.
If we want 500whp, ~50 lbs/min, 2.5 PR (~22psi at the turbo outlet, ~18-19psi at the manifold). GT3076 = ~68%, GTX3076 = 75%, GTX3071 = ~71%. So this is where the big gains are. And the GTX3071 is still better than the regular 3076.
The really really big gains for the GTX3076 over the regular GT will be in the 55+ lbs/min range.
This is an example of a discussion that is very beneficial in this thread.
Thanks for applying this knowledge.
Joined: Sep 2008
Posts: 2,104
Likes: 4
From: NoVA
Originally Posted by SlowTeg,Nov 18 2010, 03:18 PM
"Control over power? That`s what the throttle is for. "
Have you ever tried to regulate boost with your right foot from 7-12psi while focusing on racing? The reality is that your suggestion of "that's what the throttle is for" is very silly.
metros,
I think the inability to run a kit due to the manifold not being able to run lower boost is in fact a "flaw" with the kit, and I can understand why some would be a little disappointed in this fact. As others said, some of us looking at a kit are looking for something between a greddy and a Mase kit. Perhaps with a slightly smaller turbo though it would help lessen the creeping problem. We'll have to see..
Have you ever tried to regulate boost with your right foot from 7-12psi while focusing on racing? The reality is that your suggestion of "that's what the throttle is for" is very silly.
metros,
I think the inability to run a kit due to the manifold not being able to run lower boost is in fact a "flaw" with the kit, and I can understand why some would be a little disappointed in this fact. As others said, some of us looking at a kit are looking for something between a greddy and a Mase kit. Perhaps with a slightly smaller turbo though it would help lessen the creeping problem. We'll have to see..
#2 From what you said it still sounds like this kit isn't a good fit for you. Unless you build your own kit from the ground up to do exactly what you want there isn't a kit available that will fit every potential customers goals. PTuning has been very clear on what to expect for boost response, horsepower, trackability, and potential of the kit. Stop complaining in their thread that the kit isn't a good fit for you.
