More effective: mod VGT exducer or inducer?
7 blade billet wheel.. clipped turbine wheel, extrude and honed hot side... on a GT2 turbo... Or you can do it on a 997 turbo... but the GT2 turbine wheel is bigger...
There is no magic... bottom line... what are they putting out in the 1/4... (mph)... Just like on 996s a handful of turbos on paper aught to blow the doors off of smaller wheels yet they do not.. thus its not always( and hardly is) about the (lbs./minute compressor wheel size...)
just my opinion... not pointing out anything in particular...
markski
There is no magic... bottom line... what are they putting out in the 1/4... (mph)... Just like on 996s a handful of turbos on paper aught to blow the doors off of smaller wheels yet they do not.. thus its not always( and hardly is) about the (lbs./minute compressor wheel size...)
just my opinion... not pointing out anything in particular...
markski
__________________
2001 996TT 3.6L and stock ECU
9.66 seconds @ 147.76 mph 1/4 mile click to view
160 mph @ 9.77 seconds in 1/4 mile click to view
50% OFF ON PORSCHE ECU TUNING BLACK FRIDAY SPECIAL
2001 996TT 3.6L and stock ECU
9.66 seconds @ 147.76 mph 1/4 mile click to view
160 mph @ 9.77 seconds in 1/4 mile click to view
50% OFF ON PORSCHE ECU TUNING BLACK FRIDAY SPECIAL
Last edited by markski@markskituning; Sep 4, 2010 at 12:23 PM.
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how does one get upgraded vtg, do you send them your turbos and they modify it or do you get brand new ones, how much do they go for?
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You typically exchange them. Since I only had a couple of thousand miles on mine, I wanted my turbos upgraded and not exchanged for another set that were already modified. So my car sat in the shop for couple of weeks waiting for the turbos.
7 blade billet wheel.. clipped turbine wheel, extrude and honed hot side... on a GT2 turbo... Or you can do it on a 997 turbo... but the GT2 turbine wheel is bigger...
There is no magic... bottom line... what are they putting out in the 1/4... (mph)... Just like on 996s a handful of turbos on paper aught to blow the doors off of smaller wheels yet they do not.. thus its not always( and hardly is) about the (lbs./minute compressor wheel size...)
just my opinion... not pointing out anything in particular...
markski
There is no magic... bottom line... what are they putting out in the 1/4... (mph)... Just like on 996s a handful of turbos on paper aught to blow the doors off of smaller wheels yet they do not.. thus its not always( and hardly is) about the (lbs./minute compressor wheel size...)
just my opinion... not pointing out anything in particular...
markski
You've got a good point Markski. It's important to remember that the turbos are just one part of the overall package. In order for them to work their best, there are several other components that need to be well-matched....i.e. intake, intercoolers**, exhaust, and a good set of manifolds. Then there has to be some good ECU tuning to make sure all the parts speak to each other.
Simply bolting on the bigger turbos will not always get you more power, it's the total package that does that.
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Joined: Jun 2008
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the biggest issue of vtg's is high back pressure........
You've got a good point Markski. It's important to remember that the turbos are just one part of the overall package. In order for them to work their best, there are several other components that need to be well-matched....i.e. intake, intercoolers**, exhaust, and a good set of manifolds. Then there has to be some good ECU tuning to make sure all the parts speak to each other.
Simply bolting on the bigger turbos will not always get you more power, it's the total package that does that.
Simply bolting on the bigger turbos will not always get you more power, it's the total package that does that.
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Joined: Jun 2008
Posts: 1,041
From: Warsaw
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you forgot to add cam shafts to your list.....
You've got a good point Markski. It's important to remember that the turbos are just one part of the overall package. In order for them to work their best, there are several other components that need to be well-matched....i.e. intake, intercoolers**, exhaust, and a good set of manifolds. Then there has to be some good ECU tuning to make sure all the parts speak to each other.
Simply bolting on the bigger turbos will not always get you more power, it's the total package that does that.
Simply bolting on the bigger turbos will not always get you more power, it's the total package that does that.
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^^while perfecting the entire system is the end goal, learning about the individual components is a necessary step. therefore, specific discussion regarding each important component is helpful and not short sighted or incomplete.
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Sorry I'm late to the party everybody!
I'm going to keep this post as simple as I can so everyone will be able to understand. I am not trying to get into an engineering debate. I just want to provide a little info to those who are looking!
There are a lot of fantastic VTG upgrades on the market currently! At TPC, we feel that upgrading the factory VTGs is the best way to better performance for many reasons. First and foremost, retention of the VTG's "Variable Turbine Geometry" ability as it pertains to the vehicle's performance.
For those not familiar with how conventional turbochargers/VTGs work, here is a quick explanation. A turbocharger functions just like a hydro-electric damn. Except, instead of water driving the "turbine", you have the engine's exhaust gases. On the other side of things; instead of spinning an electrical generator, the exhaust gases spin an air compressor; thus creating boost!
The size of the turbine has a great effect on the turbocharger's efficiency. A smaller turbine comes up to speed very quickly, however it will suffer reduced top end performance. On the other end of the spectrum, a larger turbocharger will allow for tremendous top end performance, but will suffer in it's low-mid range performance. The VTG technology allows the turbocharger to essentially automatically configure its turbine to operate most efficiently, no matter what RPM it is spinning! This allows it to function with the characteristics of both large and small turbines, providing the driver with violent, neck snapping acceleration off the line, and tremendous top end that feels like it will never quit!
Check out this link for an even better explanation of VTG technology directly from Porsche: PORSCHE VTG TECHNOLOGY
Now, as I'm sure many of you can understand, I can't get into the specifics of what we do to our VTGs to increase their performance. But, to properly modify them to perform to a higher standard, attention must be paid to BOTH sides of the VTG. If you made the compressor wheel larger to move more air, then you would want to modify the turbine to accommodate the compressor's increase in weight and flow characteristics. On the other hand, If you modified the turbine section to improve exhaust flow, you would most certainly want to modify the compressor section as well in order to fully take advantage of the improved spooling across the revs.
But outright performance is not the only reason we focus on the factory VTGs. Another of the VTG's advantages over conventional turbochargers, is it's ability to improve fuel efficiency. Who would ever think a 500+HP Porsche could also get well over 20MPG!
Also, by using the VTG, we have not had to modify any of the turbo's oil lines, inlets, wastegates, or any other major components. This allows you to maintain that low key, stock look. The only visible modification to our 775BLITZKRIEG is our TPC Special EUROPIPE Exhaust.
When tuned properly, cars with the VTGs also maintain an absolutely wonderful drivability that simply cannot be matched by conventional turbochargers.
By combining the correct, PROPERLY modified components, you can achieve monumental performance with the very few parts. That's why our 775 BLITZKRIEG we can produce 775HP with just a set of our BLITZKRIEG 5" Intercoolers, BLITZKRIEG Modified VTGs, EUROPIPE(TPC Special), a BLITZKRIEG tune, and a set of spark plugs.
Check out this performance on our "low power" setup. Stock weight, pump fuel, AWD, and 6-speed(not Tip).
http://www.youtube.com/watch?v=cIPwtaYUkxY
The potential of VTG Turbochargers is enormous, and with such huge competition between tuners, we are continually challenged to refine our designs, in search of even greater performance!
If you have any questions, I am always more than happy to help!
Josh B
TPC Racing
I'm going to keep this post as simple as I can so everyone will be able to understand. I am not trying to get into an engineering debate. I just want to provide a little info to those who are looking!
There are a lot of fantastic VTG upgrades on the market currently! At TPC, we feel that upgrading the factory VTGs is the best way to better performance for many reasons. First and foremost, retention of the VTG's "Variable Turbine Geometry" ability as it pertains to the vehicle's performance.
For those not familiar with how conventional turbochargers/VTGs work, here is a quick explanation. A turbocharger functions just like a hydro-electric damn. Except, instead of water driving the "turbine", you have the engine's exhaust gases. On the other side of things; instead of spinning an electrical generator, the exhaust gases spin an air compressor; thus creating boost!
The size of the turbine has a great effect on the turbocharger's efficiency. A smaller turbine comes up to speed very quickly, however it will suffer reduced top end performance. On the other end of the spectrum, a larger turbocharger will allow for tremendous top end performance, but will suffer in it's low-mid range performance. The VTG technology allows the turbocharger to essentially automatically configure its turbine to operate most efficiently, no matter what RPM it is spinning! This allows it to function with the characteristics of both large and small turbines, providing the driver with violent, neck snapping acceleration off the line, and tremendous top end that feels like it will never quit!
Check out this link for an even better explanation of VTG technology directly from Porsche: PORSCHE VTG TECHNOLOGY
Now, as I'm sure many of you can understand, I can't get into the specifics of what we do to our VTGs to increase their performance. But, to properly modify them to perform to a higher standard, attention must be paid to BOTH sides of the VTG. If you made the compressor wheel larger to move more air, then you would want to modify the turbine to accommodate the compressor's increase in weight and flow characteristics. On the other hand, If you modified the turbine section to improve exhaust flow, you would most certainly want to modify the compressor section as well in order to fully take advantage of the improved spooling across the revs.
But outright performance is not the only reason we focus on the factory VTGs. Another of the VTG's advantages over conventional turbochargers, is it's ability to improve fuel efficiency. Who would ever think a 500+HP Porsche could also get well over 20MPG!
Also, by using the VTG, we have not had to modify any of the turbo's oil lines, inlets, wastegates, or any other major components. This allows you to maintain that low key, stock look. The only visible modification to our 775BLITZKRIEG is our TPC Special EUROPIPE Exhaust.
When tuned properly, cars with the VTGs also maintain an absolutely wonderful drivability that simply cannot be matched by conventional turbochargers.
By combining the correct, PROPERLY modified components, you can achieve monumental performance with the very few parts. That's why our 775 BLITZKRIEG we can produce 775HP with just a set of our BLITZKRIEG 5" Intercoolers, BLITZKRIEG Modified VTGs, EUROPIPE(TPC Special), a BLITZKRIEG tune, and a set of spark plugs.
Check out this performance on our "low power" setup. Stock weight, pump fuel, AWD, and 6-speed(not Tip).
http://www.youtube.com/watch?v=cIPwtaYUkxY
The potential of VTG Turbochargers is enormous, and with such huge competition between tuners, we are continually challenged to refine our designs, in search of even greater performance!
If you have any questions, I am always more than happy to help!
Josh B
TPC Racing
this question really is for all of the dealers/tuners: is there a difference in the lifespan of a modded vtg and stock? does anyone offer a warranty?
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Joined: Sep 2009
Posts: 299
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We offer / honor the Porshe warranty on all of our power packages and components. This ensures a piece of mind for any 997. turbo owner.
Our warranty, unlike any other tuner I'm aware of, also covers your vehicle as long as your original Porsche warranty (or extended) is intact.
The warranty, of course, is quite detailed, but the bottom line is that we stand behind our components and packages 110%. If you have questions, or want some more detailed info on our warranty, please feel free to give us a call. We'd be happy to cover it in greater detail for you.
