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GT Motorsports: 370Z Supercharger system development

Yeah, once I post why, we are all experts and knew all along, but before then no one could give me a specific answer as to why.

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Old 02-19-2010, 09:51 AM   #1096 (permalink)
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Yeah, once I post why, we are all experts and knew all along, but before then no one could give me a specific answer as to why.
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Old 02-19-2010, 10:05 AM   #1097 (permalink)
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Ya know what I just realized...There is no easy way out......I just need to pick a HP goal for my car....If the SC can do it then I should get it...If the SC can't do it then I should buy the TT kit...
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Old 02-19-2010, 10:26 AM   #1098 (permalink)
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Quote:
Originally Posted by RCZ View Post
Alright so after reading a bit from reputable sources. AKA Garrett from the stuff that Silo showed us.

Bigger turbos make more power per the same psi for two main reasons:

1) Bigger turbo will put less heat into the air and therefore the air is denser. More air = more power

2) The actual CFM of the turbo is meaningless. What matters is how much of that air is actually going into the engine and being used. There are restrictions that keep all the air from getting to the combustion chamber, the main one being backpressure from the exhaust housing of the turbo. The smaller it is the more backpressure, the less air that can flow through the engine, the less air that can flow INTO it in the first place and therefore less power. So bigger exhaust housing means less backpressure, meaning more air in, meaning more power.
The logic seems to be that it doesnt matter if the turbo can flow an infinite cfm, if the engine can't make use of it. The less backpressure, the more the engine can use, the more power it can make.

So how does this all apply to the SC vs TC dilemma?

I would say its the same thing, more flow through the engine means more power. So why do manufacturers recommend sticking with 2.5" piping rather than 3" piping on an SC? Because the sc doesnt flow enough in the first place to cause a 2.5" exhaust to become an obstruction??
This makes sense, with my 4 cyl turbo, when we just upgraded theintake and Down Pipe we saw huge gains as more air was flowing in and out. When I chipped the ECU I also went 3 in TBE and with the small turbo on the car I hit full boost @ 2500 rpms and actually had more TQ than HP on the car. I had over 300 TQ and about 260 HP on a 4 cyl FWD car, it was fun to feel all that TQ. Since the turbo does create its own back pressure we could go larger on the exhaust (to a point of no return of course) but I guess NA cars use the exhaust to create the back pressure.
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Old 02-19-2010, 10:50 AM   #1099 (permalink)
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tell me again how discuessing turbo's for the last 3 pages is on topic to this thread?
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Old 02-19-2010, 11:01 AM   #1100 (permalink)
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lol.. I was waiting for you to say something shumby! lol... Thanks for the education though guys... I'm definitely learnin' here. lol
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Old 02-19-2010, 11:06 AM   #1101 (permalink)
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MOds/admin. please move the turbo posts to there owen thread. There is useful info here but all these posts will take away from the point of this thread. (GTM's SC) makes it hard to search and find info in this topic
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Old 02-19-2010, 11:38 AM   #1102 (permalink)
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Quote:
Originally Posted by shumby View Post
tell me again how discuessing turbo's for the last 3 pages is on topic to this thread?
Because the compressor side of a turbo and a centrifugal supercharger are pretty much the same, unlike a roots-type/twin-screw supercharger. Understanding one will give you a greater understanding of the other.
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Old 02-19-2010, 12:37 PM   #1103 (permalink)
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to me the point is simple..... if you are making a small amount of boost(3-5lbs) the stock exhaust and cats can handle the amount that is trying to be pushed out. However, the more boost you make (8-10lbs) the more trouble the stock exhaust has . So by removing the restrictions in the exhaust you will see higher gains with higher boost levels.
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Old 02-19-2010, 01:03 PM   #1104 (permalink)
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Quote:
Originally Posted by shumby View Post
MOds/admin. please move the turbo posts to there owen thread. There is useful info here but all these posts will take away from the point of this thread. (GTM's SC) makes it hard to search and find info in this topic
I think it's all useful information for vets and noobs. Shoot 70 pages of this thread alone is just filled with us begging GTM for information on the SC kit. They should remove that before moving this useful information.
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Old 02-19-2010, 01:14 PM   #1105 (permalink)
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I think the little birdie may have lied about more information today.
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Old 02-19-2010, 01:28 PM   #1106 (permalink)
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Quote:
Originally Posted by budakai View Post
I think it's all useful information for vets and noobs. Shoot 70 pages of this thread alone is just filled with us begging GTM for information on the SC kit. They should remove that before moving this useful information.
Haha, agreed. Also, complaining about turbo/centrifugal sc info on this thread yet not about the random fat guy pics here makes no sense to me, lol.
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Old 02-19-2010, 01:29 PM   #1107 (permalink)
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Quote:
Originally Posted by Zsteve View Post
This makes sense, with my 4 cyl turbo, when we just upgraded theintake and Down Pipe we saw huge gains as more air was flowing in and out. When I chipped the ECU I also went 3 in TBE and with the small turbo on the car I hit full boost @ 2500 rpms and actually had more TQ than HP on the car. I had over 300 TQ and about 260 HP on a 4 cyl FWD car, it was fun to feel all that TQ. Since the turbo does create its own back pressure we could go larger on the exhaust (to a point of no return of course) but I guess NA cars use the exhaust to create the back pressure.
That is the same result that I saw when upgrading the intake and exhaust on my S13 Fastback (CA18DET). It seemed as if I was at full boost sooner, but I had no way of really telling for sure. I also installed a Power FC the next day and spent like 2.5 weeks and 5 50 liter fillups (sucked) tuning it (mostly DD efficiency). When I upgraded from the T-2-Small to 2871, all I could say was WOW. And it was a bolt on affair.

Quote:
Originally Posted by shumby View Post
MOds/admin. please move the turbo posts to there owen thread. There is useful info here but all these posts will take away from the point of this thread. (GTM's SC) makes it hard to search and find info in this topic
The next quote pretty much sums it up, but everyone is entitled to their take on things.

Quote:
Originally Posted by Buddy Revell View Post
Because the compressor side of a turbo and a centrifugal supercharger are pretty much the same, unlike a roots-type/twin-screw supercharger. Understanding one will give you a greater understanding of the other.
Well put.

Quote:
Originally Posted by BRUSSO View Post
to me the point is simple..... if you are making a small amount of boost(3-5lbs) the stock exhaust and cats can handle the amount that is trying to be pushed out. However, the more boost you make (8-10lbs) the more trouble the stock exhaust has . So by removing the restrictions in the exhaust you will see higher gains with higher boost levels.
Sounds like something that I can agree with, but I have never increased boost pressure in my setups. I have only swapped out turbos for more efficiency for my application and driving habits.
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Old 02-19-2010, 01:43 PM   #1108 (permalink)
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Sounds like something that I can agree with, but I have never increased boost pressure in my setups. I have only swapped out turbos for more efficiency for my application and driving habits.[/QUOTE]

You didnt get the car tuned after swaping the turbo to a bigger one?
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Old 02-19-2010, 01:47 PM   #1109 (permalink)
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Quote:
Originally Posted by Zsteve View Post
You didnt get the car tuned after swaping the turbo to a bigger one?
Possibly a MAF equipped car.
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Old 02-19-2010, 01:50 PM   #1110 (permalink)
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still a tune would put it in its real effiecency range as all turbos have their own sweet spot. On my stock turbo once it was tuned I gained power of course but I also gain a couple of MPG as it was in its sweet spot.
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