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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain.


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Old 05-28-2012, 10:11 PM   #1
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Thumbs up Forced Induction

This thread will serve as a general topic for modifications involving any form of forced induction- supercharger, turbocharger, etc.

As turbo kits and superchargers come out i will be posting them here for everyones benefit as well as a way to keep reviews and questions/ comments all in one place.

I will start the thread with the benefits of forced induction for the FR-S/BRZ platform.

Many people love the twins and everything tthey have to offer; balance, center of geavity, weight distribution, and the overall pure sense of driving a true drivers car. Some of us however, wish this already amazingly engineered car had a bit more power under the hood. Forced induction is a great way to add that power without altering the engine internals for a clean modification. It should be noted that adding sizable power means other areas need to balanced for the best performance depending on the ddrivers needs and goals; clutch, brakes,suspension, fuel delivery, etc.

So, without ranting too much (more) lol, please post anything relating to forced induction on these amazing cars, i am excited for all the future products in this area, the tuning houses are going to be trying to out do eachother in this area especially!
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Old 05-28-2012, 10:26 PM   #2
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Got info on the HKS Supercharger yet?
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Old 05-28-2012, 10:39 PM   #3
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Are there going to be any factory options for forced induction?

Will the HKS supercharger leave the AC compressor intact or will it be in place of it like on their race car? Does anyone else have any forced induction in the works and when will it be released? What pressure boost are we going to be safe at without replacing internals of the engine and how much gain can we expect from this?
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Old 05-28-2012, 10:43 PM   #4
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Probaly help if you put this in the right section of the forums.
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Old 05-28-2012, 10:49 PM   #5
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Originally Posted by feldy View Post
Probaly help if you put this in the right section of the forums.
The locked thread section?
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Old 05-28-2012, 10:58 PM   #6
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Here is all of the current info on the HKS kit:

1- Compact Size
The GT Supercharger employs the unique Torque Response Traction Drive System to deliver unparalleled efficiency. This system makes the size compact and the supercharger more durable even under high load.

2- High Efficiency
Comparing to the conventional positive-displacement superchargers, the centrifugal supercharger has higher compression efficiency. Also, the Torque Response Traction Drive can improve the transfer efficiency and reduce friction comparing to the conventional centrifugal superchargers



3- Noise
Centrifugal compressor eliminates the pulsation noise of discharging air. ハAlso, the traction drive utilized with the HKS GT Supercharger does not make gear noise. Furthermore, "No Backlash System" in the transmission eliminates noise under the input torque fluctuation.


4- Durability and Fuel Economy
Torque Response System which eliminates unnecessary pushing force and restrain the stress amplitude, appropriate surface process, and material selection can extend its fatigue life. At low load the pushing force is proportionally low, resulting in less fuel burn than that of other traction drive supercharger designs, which improves fuel economy.



When the turning force is increased, the roller moves toward the wedge (narrower) side. The wedge action makes the pushing force corresponding to the turning force deliver the turning force from the input ring to the output axis

Some Images:


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Old 05-28-2012, 11:02 PM   #7
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Wow!! That was fast, HKS is the way!
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Old 05-28-2012, 11:59 PM   #8
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Quote:
Originally Posted by Alias View Post
Are there going to be any factory options for forced induction?

Will the HKS supercharger leave the AC compressor intact or will it be in place of it like on their race car? Does anyone else have any forced induction in the works and when will it be released? What pressure boost are we going to be safe at without replacing internals of the engine and how much gain can we expect from this?
These are all great questions...
As far as the AC compressor is concerned, i would assume in a race car of that level they installed an underdrive pulley system to reduce mechanical weight and to prevent power loss to creature comforts (air conditioning, etc.) This results in deleting the AC compressor/pulley and the AC matrix as well (to save weight.) If the power-steering is deleted then it is another sign this tactic was employed.

Also, HKS would not make a supercharger kit that requires removing the AC, they know this is something that street cars that are tracked on weekends need as they are used for commuting and transportation more then racing. maybe they have made race car supercharger kits, but that is something completely different then modifying a street car for more performance.

A lot of aftermarket companies will tell you it is safer to replace engine internals when adding a blower, but that is only true to a small group of people- those who are adding LARGE amounts of power. At the most many people will be fine just upgrading the head studs to an ARP kit (which I highly recommend. ) It is hard to tell what amount of boost will require building the motor/head at this stage- 99% of shops, companies, and actual owners don't have the car in their possession to research and test. with a high compression ratio of 12.5:1, it is safe to say that this car will not be akin to high boost levels without head/engine modification.

In my opinion, this car does not need BIG power to be an amazing car- it already is! It is the perfect platform to enjoy by its self- as many, (including myself,) will (for at least 6months to a year lol). I am just looking for a bit more power for a few reasons combined with the fact I love working on and modifying cars.

In my opinion, the HKS kit looks amazing, clean, simple, and powerful. Let's see what GReddy has to say with their upcoming turbo kit, as well as a few other big names, but I am extremely confident HKS will earn my money at the right time.
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Old 05-29-2012, 04:37 AM   #9
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In the images shown there is definitely no AC, it has been deleted.

This is a very difficult car to SC as can seen by the need to ditch the AC system
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Old 05-29-2012, 02:38 PM   #10
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Definitely not an easy SC job, but it appears from the top pic that HKS made it work, and retained the AC. If the engine hadn't been pushed lower and farther to the back. it may not have been possible.
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Old 05-29-2012, 08:46 PM   #11
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This grid is a general idea of compression ratio VS boost. It doesnt go up to 12.5, but it goes to 12 and its for getting an idea of some numbers only.



Final Compression Ratio Chart

This chart shows the final compression ratio combining the static compressionratio of an engine and the maximum blower boost from the blower system. It is to be used as a guideline in determining the proper maximum boost level for a specific application. Final compressionratios in excess of 12.4:1 are not recommended for use with "pump gas." The higher the final compression ratio, the higher the octane rating of the fuel must be in order to help prevent detonation and serious engine damage. The formula for calculating your exact final compression ratio is as follows:

Final Compression Ratio (FCR) = [ (Boost÷14.7) + 1 ] x CR

Boost = Maximum blower boost 14.7 = psi at sealevel CR = engine compression ratio

Altitude plays an important role in determining compression ratios. If the altitude in the area where you normally drive is significantly higher than sealevel, then your compression ratios will also vary. To determine the effects of the altitude on a calculated compression ratio, use the following formula:

Corrected Compression Ratio = FCR - [ (altitude÷1000) x 0.2 ] =Pump Gas = Good Gas
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Last edited by Primo86; 05-29-2012 at 08:57 PM. Reason: bad image link
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Old 05-29-2012, 08:50 PM   #12
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TONS TONS TONS of info here on the HKS GT Kit http://www.ft86club.com/forums/showt...s+supercharger
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