HKS Supercharger

[HKS Australia]

Originally Posted by Don@Accelerated

You need to understand though that the supercharger at 2800rpm is not doing anything but causing parasitic losses.

Not correct Don. The HKS Supercharger is making an extra 20hp at the wheels by 2800rpm. This is on top of the driven losses.

I like your turbo kit by the way. Very nice packaging and innovative design.

Cheers
HKS Australia

[czar07]

Originally Posted by uspspro

This stuff has already been discussed several times....

That.

I think where most people are getting confused is the difference between turbo lag and throttle response lag.

Couple of simple explanations:
- Turbo lag is created when the engine needs a decent amount of RPM to spool the turbo
- Throttle response lag is the time it takes for the engine to respond after you have pressed the accelerator. Turbos sometimes have a tendency to increase this lag due to being a massive restriction on the exhaust. Superchargers generally have less throttle response lag than turbos.

[Don@Accelerated]

Originally Posted by SkullWorks

As Don can attest to I am sure,

The perceptible "lag" on a motor with a properly sized turbo and ridiculous compression ratio, is virtually non existent. There is so much exhaust energy with high comp motors it really is the perfect partner for a Turbo.

Don,
have you tried to Dyno in 5th or sixth to really load up the motor I'll bet there is better spool time in the higher gears, (not that there was an excess initially)

I have not. Only 4th on the dyno.

[Don@Accelerated]

Originally Posted by HKS Australia

It's not missleading and shows clearly by design it's not driving the compressor at low rpm to reduce crankshaft losses associated with other superchargers. We all know that any forced induction will have it's pro's and cons whichever course you follow. A supercharger in general compared to a similar sized turbo will make power sooner in the RPM range. This is a general statement as it can all change when stating specifics about particular turbo's or superchargers. This is why HKS chose this setup to make the engine feel larger in capacity in feel with the car's design.
Cheers
HKS Australia

So this is an oil driven Rotrax?

[Don@Accelerated]

Originally Posted by HKS Australia

Not correct Don. The HKS Supercharger is making an extra 20hp at the wheels by 2800rpm. This is on top of the driven losses.

I like your turbo kit by the way. Very nice packaging and innovative design.

Cheers
HKS Australia

Do you have a graph that we can overlay and compare to one another. Thus far I only have the turbo setup working at 3 creeping to 4. I'd imagine that once we can solve the ecu issues, I'll be able to pick up another 20-30 hp. Don't quote me on that yet until I do it.

Any idea what costs are going to be on the supercharger kit. I have a customer interested in supercharging. I've heard prices all over the place and as high as 8500 usd.

Don

[Coheed]

Originally Posted by Don@Accelerated

I'll dyno it with the hose off and see if it makes a difference. I'm curious as to that one as well.

Don

It will have a loss, and expect a little bit of oil to pass by the seals in the turbo, likely on the compressor side. At least from my experimentation, the engine does lose a little power from driving the turbine. Shaft speed gets a bit high, but I wouldn't expect any damage to the turbo if you plan on testing it.

We've blown couplers on even GT45r turbos on 50+psi boost and probably over spooled the snot out of the turbos and never had an issue with the turbo being damaged.

[Supermassive]

Originally Posted by Beardo

The GT86/BRZ is sold as being all about throttle response and "purity". Turbo lag is not about waiting till 2800rpms while it builds boost it's about how quickly the turbo delivers once you get back on the throttle.

My understanding (and experience from an Audi S4) is that Superchargers have throttle response. Turbocharged cars are getting better but without an anti lag system they are not on the same page.

I'm sorry but my FR-S doesnt really come alive until I've broken 4k RPM, it sucks so hard if I shift too soon and end up int the 3k - 4k dead zone on this motor. A turbo will have some lag but its not like its gonna break the way this car works...hell if you dont want to deal with boost I'm sure there will be some nitrous kits that use progressive injection to offset that lag for those that need it...I had a similar kit on my 98 Supra way back in the day when Venom nitrous was new

[Jesse]

bye bye a/c

[HKS Australia]

Originally Posted by Don@Accelerated

So this is an oil driven Rotrax?

No Don but similar. HKS had no success with the Rotrex so redisigned their own for better reliability.
Cheers
HKS Australia

[HKS Australia]

Originally Posted by Don@Accelerated

Do you have a graph that we can overlay and compare to one another. Thus far I only have the turbo setup working at 3 creeping to 4. I'd imagine that once we can solve the ecu issues, I'll be able to pick up another 20-30 hp. Don't quote me on that yet until I do it.

Any idea what costs are going to be on the supercharger kit. I have a customer interested in supercharging. I've heard prices all over the place and as high as 8500 usd.

Don

I do but only from testing 6 months ago. I'm also not able to post that up on here sorry. It made 251hp at 6500rpm but as you are probably finding out with your EcuTek there is issues (with more boost to make this power figure) trying to control the 2 injectors per cylinder. On a race car it doesn't matter and you can make up to 300hp without engine issue BUT retaining factory driveability with 8psi and the direct injection is not easy. So far HKS are only controlling the upstream injector and fitted a restrictor on the Supercharger intake to limit power because of this.
Cheers
HKS Australia

[HKS Australia]

Originally Posted by Jesse

bye bye a/c

Check out my picture of the kit again and you will see it's all ok with A/C.
Cheers
HKS Australia

[clayrush]

Whatever FI setup I go with, I am going to try to hold out for something that is CARB legal but is able to be possibly upgraded for off road use. Also I wonder what tings will be like with a complete stand alone computer like a Power FC

[Xenocide117]

Originally Posted by clayrush

Whatever FI setup I go with, I am going to try to hold out for something that is CARB legal

This. Especially when CARB standards are only going to spread in the coming years. Hopefully someone isn't only concerned with max gains and will make a legal kit. I know I would buy one.

[cruzinbill]

Originally Posted by HKS Australia

Check out my picture of the kit again and you will see it's all ok with A/C.
Cheers
HKS Australia

could you post a different pic of it, its hard to see anything behind the S/C due to the angle of the one.