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


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Old 05-29-2012, 02:42 PM   #183
86purity
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Originally Posted by uspspro View Post
The Rotrex has so many good points. Sure it won't make the mid-range punch of a properly sized turbo, or the off-idle torque of a roots/twin screw, but it has several things going for it. I had one on my MR2 Spyder for a good while, before I went with the 3.5L V6 swap.

1) It's quiet. They use planetry rollers with traction oil, instead of gears. So there is no gear whine like other superchargers. I view this as a plus, I like the sound of the engine not to be drowned out by the SC. It will make the engine quite a bit louder and more "serious", lots more induction sucking sound and louder exhaust. The sound is awesome, and this is a huge plus IMHO.

2) It is reliable. Self contained oiling system with oil cooler, reservoir and filter. Alll of the components are compact, and can be installed easily. Rotrex is also the OEM supercharger for the Koenigsegg ccx (although they use two of them)

3) The boost ramp is much better than typical centrifugal blowers. The planetary rollers, high gear ratio, and well designed compressor housings allow the boost to ramp up quickly.

4) The use of restrictors. You can place a restrictor on the compressor inlet, which allows a maximum air flow, thus limiting the maximum boost. This allows you to use smaller SC pulleys to spin the SC up to higher boost numbers at lower RPM, but not have some stratospheric max boost. For my build, I used forged 9.0:1 pistons, so I did not use a restrictor and boosted up to 17psi. However for a stock bottom end with high compression, the restrictor makes perfect sense. Imagine a pulley capable of delivering 15 psi at redline, but with a restrictor keeping it at 8psi instead. You will probably see that 8 psi pretty early in the mid-RPM range and then it will hold that boost level. HKS has information about restrictors.

5) Packaging and heat. The compact packaging allows for good placement in the engine bay, and makes it easy to install an intercooler. Also, the SC produces MUCH less heat than a turbocharger. This leads to a more reliable setup: Easier to keep temps in check, less "baking" of engine bay components, better intake air temperatures.

I think a 250 rwhp Rotrex kit would be perfect for this car, IMHO... And, if they so chose, power-mongers can change out the restrictor and pulley along with a built bottom end and go for 350+
Very informative! Just about what I was thinking! The SC seems to make more than I expexted (75whp) with the high compression. This would be plenty for street use. I'm a bit of a purist, and NA is so visceral, so I may go with a top end build from Cosworth when they have it available. I could do the SC myself though. Tempting!
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Old 05-31-2012, 09:07 AM   #184
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[ame="http://www.youtube.com/watch?v=t17hw2A8olw"]【HKS Racing Performer 86】 GT Supercharger spec test run - YouTube[/ame]
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Old 05-31-2012, 09:10 AM   #185
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10:50 mark for shots of the supercharger that we have already seen
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Old 05-31-2012, 12:29 PM   #186
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can someone translate if any good info is being shared? thanks
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Old 06-02-2012, 05:17 PM   #187
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Can customers have air conditioning and supercharger together? Can't bear the though of no A/C in this day and age
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Old 06-02-2012, 06:43 PM   #188
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Can customers have air conditioning and supercharger together? Can't bear the though of no A/C in this day and age
Yes, that vid cleared out that question.

In the vid SC is for public, stock engine SC kit... which equal to yes on AC.
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Old 06-02-2012, 08:28 PM   #189
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ive installed many turbo and SC kits, and in my opinion HKS is by far the best for many reasons. let me list the ways.
1. fitment is great. small amount or no molestation to the chassis and body parts. some kits require you to cut this, notch that, whole saw here..... who wants to cut up their brand new car. they also cast alot of intercooler piping pieces to fit into small areas. this reduces the number of intercooler pipe and silecone couplers you have to use (less chance of one poping off).
2. parts last very long. Most of the SC brackets are casted with supports in them to reduce vibration. this will in long term extend the life of bearings and belts.
3. although their bolt-on kits arent rated at high hp, the power band is very strong. so if your daily driving it feels like twice the ponies
4. all hardware included in their kits are top notch. fitting are usually steel, not brass pluming ones from the hardware store(that some companies use. rubber hoses and vacuum line have a thick wall thickness so they dont bind around tight spaces. oil feed and return lines are made specific for every application, some companies provide you with 2 fittings and 10ft of coolant hose and have you make them your self.
5. install is straight foward with good instructions(lots of pictures)
6. never have to remove AC or PS
7. quality control is great! never parts missing or broken.

all in all, if your looking for a FI kit to get with the least amount of headaches, HKS is the way to go. the extra money spent is worth it






here is an example of the HKS Nissan 350Z and Honda CRZ kit.
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Old 06-02-2012, 08:44 PM   #190
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This will be my biggest project to save up for!
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Old 06-02-2012, 09:32 PM   #191
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Has the SC kit for the 86/BRZ been tested for use at high temperatures, is it good for sustained operation in 90F + ambient temps?
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Old 06-03-2012, 06:38 PM   #192
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Has the SC kit for the 86/BRZ been tested for use at high temperatures, is it good for sustained operation in 90F + ambient temps?
if its intercooled it should be fine imo.
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Old 06-03-2012, 07:02 PM   #193
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So very tempting.. If Subaru and Toyota decide not to do anything with this chassis when I'm ready to trade in, this will likely be the route I go.
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Old 06-04-2012, 01:50 PM   #194
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I really can't see the kit making more than 250 crank HP due to the high compression of the stock motor unless the dyno run included a reworked exhaust. 250 is fine though. Probably just right for this car. If you want huge power just get an STi.
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Old 06-04-2012, 03:10 PM   #195
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drop the compression to 10:1, add in 7 psi, and you get exactly 250hp.
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Old 06-04-2012, 04:34 PM   #196
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I the issue here is the limitation of the DI system, not the compression. Can't see a budget way to make the DI work effeciently at higher boost!
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