Why Supercharged Instead of Turbo?

[Ganthrithor]

I haven't gone FI yet, partly because warranty, partly because I don't have the cash to do it properly (there are a few suspension and aero changes I want to make alongside FI if I go that route, so it's going to be expensive), but if/when I do, it will be with a supercharger (probably the Jackson Racing, CARB-approved kit).

The reason is the superior transient response of supercharged engines-- they just feel much more like a naturally-aspirated engine in that regard. Turbo cars can be a lot of fun, but the responsiveness of supercharged cars is really nice to have, especially in cars like these that were made to carve up corners. Balancing the car on the throttle mid-corner is so much easier when you're not having to think half a second or more ahead to predict what throttle inputs will get you x amount of boost in how long. Half a second doesn't sound like a long time, but when you're trying to time an application or reduction of torque to coincide with some mid-corner lump in the pavement ahead of you, it feels like a long time.

[TurboBRZ]

Originally Posted by LucidMomentum

Around 210 - 220 WHP and 190 FT/LB Torque with the OFT Tune and 91 Octane, for around $2K.

I'm just curious why you would be willing to spend so much money for such little hp gain?

[TurboBRZ]

Originally Posted by Dadhawk

If I were to add one, it would definitely be a Supercharger, primarily for simplicity and the bottom end (off the line) boost. I don't particularly care for the "turbo lag" boost at a certain RPM, I want my power off the line from the beginning.

Off the line would imply drag racing, in which case most drivers rev their engines up to 4-5k RPM's to make sure boost is there when they launch.

[TurboBRZ]

Originally Posted by xsnapshot

This isn't really true. Nothing is free. Your turbo runs off of back pressure. What generates back pressure? Your engine.

Your engine is having to work harder to expel the exhaust gas out vs NA motor.

This is only true if the turbo manifold runners and collector are smaller than the stock header, which they are not. The stock exhaust is 2" and I have a 2" outlet on the back wheel of my turbo. Plus my runners are slightly larger on the manifold.

[TurboBRZ]

Originally Posted by CSG Mike

Not quite.

Lets say your turbo kit spools at 3500 RPM.

Lets go to 6000 RPM in 3rd gear. Now, lift, and let the RPMs start dropping. When you're at 5000 RPMs, stomp on the gas pedal. How long is that delay between when you stop on the gas, and when you actually have full boost? You're in that "goldilocks zone", but you *still* have to wait for the turbo to spin up. Your power is always there with a SC or NA car.

You assume I ever let my foot off the gas to go from 6k to 5k rpm's... I don't. I've run many tracks, drifted with the pros on pro courses in Japan, and maintaining your throttle position is key to any type of performance driving. If you're letting your RPM's fall without keeping your foot on the accelerator then of course you're going to get lag in any situation. There is always a delayed response to your foot.

[Dadhawk]

Originally Posted by TurboBRZ

Off the line would imply drag racing, in which case most drivers rev their engines up to 4-5k RPM's to make sure boost is there when they launch.

Nope not drag racing, my application is daily driver. I want smooth accelerating power distribution off the line, meaning at stop lights and such.

[CSG Mike]

Originally Posted by TurboBRZ

You assume I ever let my foot off the gas to go from 6k to 5k rpm's... I don't. I've run many tracks, drifted with the pros on pro courses in Japan, and maintaining your throttle position is key to any type of performance driving. If you're letting your RPM's fall without keeping your foot on the accelerator then of course you're going to get lag in any situation. There is always a delayed response to your foot.

Not sure if srs, or just driving flat out.

I'm gonna assume that since you're technique is so superior to the average pro driver that, your turbo setup(s) also don't need any sort of recirc/blow-off.

[wparsons]

Originally Posted by TurboBRZ

This is only true if the turbo manifold runners and collector are smaller than the stock header, which they are not. The stock exhaust is 2" and I have a 2" outlet on the back wheel of my turbo. Plus my runners are slightly larger on the manifold.

That's not even remotely true.

Even the stock header with cat flows much better than the hot side of the turbo. A turbo is by far the biggest exhaust restriction most enthusiasts will run.

If a turbo flowed as well as a section of straight pipe, it wouldn't be able to build boost since the air would just be bypassing the turbine instead of spinning it.

[wparsons]

Originally Posted by TurboBRZ

You assume I ever let my foot off the gas to go from 6k to 5k rpm's... I don't. I've run many tracks, drifted with the pros on pro courses in Japan, and maintaining your throttle position is key to any type of performance driving. If you're letting your RPM's fall without keeping your foot on the accelerator then of course you're going to get lag in any situation. There is always a delayed response to your foot.

There are many situations where you don't want to be left foot braking with your right foot into the throttle enough to keep boost building. That is, unless you know more than actual pro drivers. I can only assume that since you're not being paid to race, you don't know better than they do.

Just give up already, you started a thread to ask for opinions and you're getting intelligent answers, just not the answers you wanted. It sure sounds like the only reason you started the whole thread was to try to make yourself sound smarter, but you're not. You're just coming off as an ass.

[CSG Mike]

Originally Posted by wparsons

There are many situations where you don't want to be left foot braking with your right foot into the throttle enough to keep boost building. That is, unless you know more than actual pro drivers. I can only assume that since you're not being paid to race, you don't know better than they do.

Just give up already, you started a thread to ask for opinions and you're getting intelligent answers, just not the answers you wanted. It sure sounds like the only reason you started the whole thread was to try to make yourself sound smarter, but you're not. You're just coming off as an ass.

Well, apparently the OP's turbo is always spooled up, like a supercharger, in which case there would be no disadvantage of being turbocharged.

I've not yet achieved this level of driving, and apparently neither have the F1 drivers, since they all also have to deal with turbo lag.

[JS + BRZ]

It wasn't a good idea for "TurboBRZ" to make a thread like this.

[Yoda]

Originally Posted by JS + BRZ

It wasn't a good idea for "TurboBRZ" to make a thread like this.

He already got his answer on the first page. The rest is just fluff

[LucidMomentum]

Originally Posted by TurboBRZ

I'm just curious why you would be willing to spend so much money for such little hp gain?

The main reason is that it's enough extra torque to really get rid of that dip. Also it's instant boost, it takes the motor milliseconds to spool up to full speed.

Also it requires very little work to install it. It's removable in less than a half hour for when you take it into the detailer, etc.

For reference though, what would you do with 2K to get similar performance? It's good for people to know their options.

[wparsons]

Originally Posted by CSG Mike

Well, apparently the OP's turbo is always spooled up, like a supercharger, in which case there would be no disadvantage of being turbocharged.

I've not yet achieved this level of driving, and apparently neither have the F1 drivers, since they all also have to deal with turbo lag.

Now that you've mentioned F1, I would totally take one the lag free turbos once they hit the market.