HKS Supercharger

[wcbjr]

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.

That's why transmissions have gears. Put it in the right gear and lag is a non-issue.

[Don@Accelerated]

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.

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

[Beardo]

I agree but everyone seems to relating lag to building boost which is something different.

However after saying all of that i'm not a driving god that's for sure so a solid thud from either way of forced induction will give me a bigger smile I expect than a very quickly delivered fart into a crisp packet that the standard car seems to deliver!

[knapper]

Originally Posted by Don@Accelerated

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

Nail on head.:happy0180:

[EvoFanatic]

Originally Posted by Don@Accelerated

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

This is also true of turbochargers but to a lessened degree since they do not derive their power directly from the drive train. However, they act as an orifice to the exhaust line at lower RPM, potentially causing the same type of loss.

[thebear21]

we all want something NOW! but if we just relax a bit. a lot better and CHEAPER things will come. (roots!)

[Don@Accelerated]

Originally Posted by thebear21

we all want something NOW! but if we just relax a bit. a lot better and CHEAPER things will come. (roots!)

A roots on this engine is most likely A. Not going to fit or B. will make to much heat

[Don@Accelerated]

Originally Posted by Beardo

I agree but everyone seems to relating lag to building boost which is something different.

However after saying all of that i'm not a driving god that's for sure so a solid thud from either way of forced induction will give me a bigger smile I expect than a very quickly delivered fart into a crisp packet that the standard car seems to deliver!

So when your supercharger has netted a loss @ 2800rpm and my turbo has picked up 30hp @ 2800rpm. Your considering that to be laggy and with less power?

If we were discussing a much larger turbo, the story would be different.

[Don@Accelerated]

Originally Posted by EvoFanatic

This is also true of turbochargers but to a lessened degree since they do not derive their power directly from the drive train. However, they act as an orifice to the exhaust line at lower RPM, potentially causing the same type of loss.

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

[d1ck]

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

I wouldn't recommend doing that unless you want to damage the turbo. I can't imagine what speed that poor little turbine would hit with no load and the wastegate sealed shut. (As it would be without any pressure being sensed by the wastegate actuator.)

[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)

[Silverdub]

I was looking at ghat kit long time ago and i am waiting for more info and pricing beforetaking any descisions. This is my first choice and then it would be turbo

[uspspro]

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

[HKS Australia]

Originally Posted by sw20kosh

That statement is misleading. To compress air a supercharger needs power. It gets its power from the crankshaft. Plain and simple. The power needed t turn the compressor wheel doesn't just come out of nowhere.

In regards to "down low" are you talking about the supercharger being on a clutch system where the supercharger is not engaged during low load low rpm driving? If so, roots type superchargers have been developed with the same system. Reduces the parasitic drag on the engine when boost/power is not needed. :happy0180:

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