STILLEN 370Z Supercharger System - Announcement!!!

RCZ · 03-19-2010, 01:51 PM

Which car for the race car? a GTR?

Phimosis · 03-19-2010, 03:15 PM

RE: noise made by vortech V3 blower; On Youtube there are quite a few extended user videos of V3 blowers on G35's. In car, out of car, stock exhaust, aftermarket exhaust. It's a good starting point. I'm sure Stillen wants to get videos up on Youtube for promotional purposes just as badly as we want to see them.

RE: Parasitic drag of S/C and revving of engine; Revving of engine is based on (net torque) / (moment of inertia). For those that are not familiar with moment of interia, it is the rotational mass and how far from the rotational center the mass is placed. increasing the distance from center increases the torque needed to accelerate the object. In the case of a SC engine, the bulk of the rotational mass is the crank, pistons and rods. The moment of inertia, though is heavily influenced by the flyheel because of its large diameter. The moment of inertia of the supercharger is low because of it's small diameter, so the supercharger's biggest imapact is on net torque, which is (torque made by engine) - (parasitic loss). With all of this said, off idle the SC is not making boost so net torque is lower than stock and decrease the rate of revving. by 2,000 rpm or so the blower will make some boost and net torque will be higher than stock and boost will build to redline, so the increase in net torque over stock will increase to the redline as well. The end result: near stock revability from idle to about 2,500 rpm, then explosive increase in rate of rpms gained all the way to redline. The sensation of bog is not really "bog." That implies that when you open the throttle, net torque decreases. That does not happen. Torque will increase, but increases at low rpm will not be impressive. You think it's bogging because you're expecting 350 lb/ft of torque and 8psi of boost at 2,000 rpm like you get at 5,000 rpm.

stormcrow · 03-19-2010, 03:33 PM

Quote:

Originally Posted by Phimosis

RE: noise made by vortech V3 blower; On Youtube there are quite a few extended user videos of V3 blowers on G35's. In car, out of car, stock exhaust, aftermarket exhaust. It's a good starting point. I'm sure Stillen wants to get videos up on Youtube for promotional purposes just as badly as we want to see them.

RE: Parasitic drag of S/C and revving of engine; Revving of engine is based on (net torque) / (moment of inertia). For those that are not familiar with moment of interia, it is the rotational mass and how far from the rotational center the mass is placed. increasing the distance from center increases the torque needed to accelerate the object. In the case of a SC engine, the bulk of the rotational mass is the crank, pistons and rods. The moment of inertia, though is heavily influenced by the flyheel because of its large diameter. The moment of inertia of the supercharger is low because of it's small diameter, so the supercharger's biggest imapact is on net torque, which is (torque made by engine) - (parasitic loss). With all of this said, off idle the SC is not making boost so net torque is lower than stock and decrease the rate of revving. by 2,000 rpm or so the blower will make some boost and net torque will be higher than stock and boost will build to redline, so the increase in net torque over stock will increase to the redline as well. The end result: near stock revability from idle to about 2,500 rpm, then explosive increase in rate of rpms gained all the way to redline. The sensation of bog is not really "bog." That implies that when you open the throttle, net torque decreases. That does not happen. Torque will increase, but increases at low rpm will not be impressive. You think it's bogging because you're expecting 350 lb/ft of torque and 8psi of boost at 2,000 rpm like you get at 5,000 rpm.

Checking for YouTube videos now. Thanks for the idea. May hit up RedTube while i'm looking at tube sites.

The "bog" (maybe not the best usage of the word, but was trying to portray a mental image) is from when the throttle plate opens until the RPMs start to build. The difference in an N/A car vs the centrifugal SC car is noticable (at least it was on my Vortech'd G35) in this moment as the parasitic drag is at its pinnacle due to no boost.

Chris@FsP · 03-19-2010, 05:05 PM

Quote:

Originally Posted by stormcrow

Checking for YouTube videos now. Thanks for the idea. May hit up RedTube while i'm looking at tube sites.

The "bog" (maybe not the best usage of the word, but was trying to portray a mental image) is from when the throttle plate opens until the RPMs start to build. The difference in an N/A car vs the centrifugal SC car is noticable (at least it was on my Vortech'd G35) in this moment as the parasitic drag is at its pinnacle due to no boost.

stormcrow · 03-19-2010, 07:43 PM

Quote:

Originally Posted by FailsafePerf

Wow at the results when searching that site for "blower."

SeeyaBud86 · 03-19-2010, 08:46 PM

Found this on Motortrend:

515 Horsepower Stillen Supercharger Kit for 2010 Infiniti G37 and Nissan 370Z - Wide Open Throttle - Motor Trend Magazine

nuTinmuch · 03-19-2010, 08:58 PM

Quote:

Originally Posted by SeeyaBud86

Found this on Motortrend:

515 Horsepower Stillen Supercharger Kit for 2010 Infiniti G37 and Nissan 370Z - Wide Open Throttle - Motor Trend Magazine

Iiiiiiinteereessting.

RCZ · 03-19-2010, 04:56 PM

Quote:

Originally Posted by Phimosis

RE: noise made by vortech V3 blower; On Youtube there are quite a few extended user videos of V3 blowers on G35's. In car, out of car, stock exhaust, aftermarket exhaust. It's a good starting point. I'm sure Stillen wants to get videos up on Youtube for promotional purposes just as badly as we want to see them.

RE: Parasitic drag of S/C and revving of engine; Revving of engine is based on (net torque) / (moment of inertia). For those that are not familiar with moment of interia, it is the rotational mass and how far from the rotational center the mass is placed. increasing the distance from center increases the torque needed to accelerate the object. In the case of a SC engine, the bulk of the rotational mass is the crank, pistons and rods. The moment of inertia, though is heavily influenced by the flyheel because of its large diameter. The moment of inertia of the supercharger is low because of it's small diameter, so the supercharger's biggest imapact is on net torque, which is (torque made by engine) - (parasitic loss). With all of this said, off idle the SC is not making boost so net torque is lower than stock and decrease the rate of revving. by 2,000 rpm or so the blower will make some boost and net torque will be higher than stock and boost will build to redline, so the increase in net torque over stock will increase to the redline as well. The end result: near stock revability from idle to about 2,500 rpm, then explosive increase in rate of rpms gained all the way to redline. The sensation of bog is not really "bog." That implies that when you open the throttle, net torque decreases. That does not happen. Torque will increase, but increases at low rpm will not be impressive. You think it's bogging because you're expecting 350 lb/ft of torque and 8psi of boost at 2,000 rpm like you get at 5,000 rpm.

Phi: Very informative reply and well explained! +1 for you sir. Its not so much that I was expecting 350lb/ft at 2kRPM. My question was more geared towards rev matching and rpm drop between gears. I wanted to know if the fact that there is an extra belt/sc added to the system would cause some parasitic drag, kinda like the A/C system does. I know its definitely not the same, but I guess with the boost being made either way it makes sense that it would shoot to redline explosively. I have lots to learn about superchargers and I'm loving this whole thing. Your answer covered it all and more. Also good call on the youtube, I will check those out. Thanks again.

Kyle@STILLEN · 03-22-2010, 12:54 PM

Quote:

Originally Posted by RCZ

Which car for the race car? a GTR?

It's a 370.

RCZ · 03-22-2010, 02:38 PM

Quote:

Originally Posted by Kyle@STILLEN

It's a 370.

Awesome news. That means new parts and lots more R&D on this car. I was hoping it was a 370z! I'm really looking forward to the results of that, more than likely some of the stuff you have to come up for the race car will trickle down to us common folk.

370Zsteve · 03-24-2010, 09:03 AM

Quote:
Originally Posted by RCZ

Which car for the race car? a GTR?

Quote:

Originally Posted by Kyle@STILLEN

It's a 370.

Well now that will come in handy as R&D for the rest of us!

03-19-2010, 08:46 PM	#6 (permalink)
SeeyaBud86 Enthusiast Member Join Date: Jun 2009 Location: Naples, FL Posts: 480 Drives: 09 PW 370z 6MT Rep Power: 17	Found this on Motortrend: 515 Horsepower Stillen Supercharger Kit for 2010 Infiniti G37 and Nissan 370Z - Wide Open Throttle - Motor Trend Magazine __________________ My Z:http://www.the370z.com/members-370z-...l-finally.html 1969 MGB for sale: http://www.the370z.com/other-vehicle...ml#post1238143

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03-19-2010, 01:51 PM	#1 (permalink)
RCZ A True Z Fanatic Join Date: Nov 2008 Location: Miami Posts: 6,403 Drives: '09 370Z Rep Power: 1119	Which car for the race car? a GTR?

03-19-2010, 03:15 PM	#2 (permalink)
Phimosis Enthusiast Member Join Date: May 2009 Location: Oildale, CA Posts: 412 Drives: 2013 911 4S Rep Power: 417	RE: noise made by vortech V3 blower; On Youtube there are quite a few extended user videos of V3 blowers on G35's. In car, out of car, stock exhaust, aftermarket exhaust. It's a good starting point. I'm sure Stillen wants to get videos up on Youtube for promotional purposes just as badly as we want to see them. RE: Parasitic drag of S/C and revving of engine; Revving of engine is based on (net torque) / (moment of inertia). For those that are not familiar with moment of interia, it is the rotational mass and how far from the rotational center the mass is placed. increasing the distance from center increases the torque needed to accelerate the object. In the case of a SC engine, the bulk of the rotational mass is the crank, pistons and rods. The moment of inertia, though is heavily influenced by the flyheel because of its large diameter. The moment of inertia of the supercharger is low because of it's small diameter, so the supercharger's biggest imapact is on net torque, which is (torque made by engine) - (parasitic loss). With all of this said, off idle the SC is not making boost so net torque is lower than stock and decrease the rate of revving. by 2,000 rpm or so the blower will make some boost and net torque will be higher than stock and boost will build to redline, so the increase in net torque over stock will increase to the redline as well. The end result: near stock revability from idle to about 2,500 rpm, then explosive increase in rate of rpms gained all the way to redline. The sensation of bog is not really "bog." That implies that when you open the throttle, net torque decreases. That does not happen. Torque will increase, but increases at low rpm will not be impressive. You think it's bogging because you're expecting 350 lb/ft of torque and 8psi of boost at 2,000 rpm like you get at 5,000 rpm.