1/4 mile means little, that's just the driver.... it can vary too much. Dyno is a little more objective, but still too much error either way.

Also keep in mind the area under the curve... there isn't any way that the supercharger can generate as fat of a curve as a turbo can due to the linear boost ramp. They can only make 5 psi at 3,000 rpm's if they make 10 psi at 6,000 rpm's. Therefore they have far less output capability at 3,000 rpm's than a turbo that can generate the full 10 psi from 3k all the way up. Some of the good small turbos can generate 5-8 psi down around 1500 to 2,000 rpm's as well which is pretty much as low as anyone will ever reach during any kind of acceleration.

Also, the centrifugal style compressor has no major efficiency advantage or improved outlet temperature over a turbo as it is the same compressor wheel, it picks up some ground by the fact that it spins about half the speed and that it isn't adjacent to the exhaust gases to heat the turbine housing. But again, the effect is somewhat minimal overall when you compared against a properly IC'ed turbo.

A super does typically have benefit in reliability and safety supposedly. And it is certainly a pretty decent system overall. But I'm just pointing out some of the aspects typically overlooked by people. Also, you can only add so much boost with a super, you can change out pulley's etc, but the more you do that the more you rob from the engine at the same time. Super's can rob nearly 20% of the engine power. They make it up and that's the numbers that you see... but it does still take power to turn that shaft, whereas a turbo uses natural exhaust exit and does little to nothing to hurt the engine as far as power output.

There are definitely good aspects of the super, and I think it is a good choice for some people, and not a great choice for others. Just make sure you understand the whole operation and function of the system. Yes you'll get no lag, but you'll also get "no" boost down low. Most properly sized turbo's have nearly 0 lag now. The G16 I run in my car is nearly instantaneous to positive pressure.

Later,

Steve

 

This sounds good to me - anyone have any objections to what steve has said?

also steve i have a question...

if i were to just "race" people form red light to red light wouldnt the supercharger be better?

 

If both vehicles had the same rated peak output power I"d probably put my money on the turbo car as it has more at the middle of the curve. The supercharger can be like putting on very large heavy rims or adding a heavier flywheel, there is more inertia for the engine to overcome to rev.

This is somewhat of mathematical paper racing though... I'd have to see two dynos to really have a solid idea. I'm very curious about the overall curve on the RIPP charger...

 

sdhotown---> Great posts man... subjective info like that is what makes the lancer get better and better every day.

 

I think you mean objective right?

I like cars... cars and boost... past that I don't care what it is or who makes it if it is fast and drives the way I like!

 

Exactly... right on both accounts, my grammer and the feeling of dependable speed!!

 

Either boe or steve, could u answer this little question...

which would be better for just going fast from like 0-60 or so, because im not down with the whole illegal street races and going to the track and so forth, just the little red light to red light races

 

Isn't the red light to red light type of racing nearly equivalent to the illegal street races? Or is it only illegal when it meets up to the strict Fast and the Furious standards?

Anyway, I'd guess they'll give you a rather ambiguous answer to your question. That's gonna depend on the area under the curve for the dyno graph and the driver. If the driver gets a good launch and keeps the car in the power band with either setup, he'll do well with the 0-60 times, regardless of whether its a super- or a turbo-charged engine.
-N

 

I suppose if you aren't exceeding the speed limit it's not illegal... that'd be about what I do on rare occasion and that it's... otherwise track time for me :0

Yes... neilscully has it exactly right. It's area under the curve and how good the driver is basically. In general you'd expect the turbo to have the fatter power curve so it'd be faster, but that's not always the case... so it's a toss up typically.. but if anything I'd lean toward the turbo on this one.

 

Thanks steve - ya well, i mean red light to red light in naperville is like everyone 50ft *not literally* so i mean, i would definatly not exceed 60, which is atmost 20 over anywhere, which isnt too bad, because i normally do 50, as well with everyone else in this town.

Im just not down with the whole, lets race to 100 on a crowded street thing, like when u see it on tv and movies and so forth.

 

its illegal in FL even if you deont exceed the speed limit. my friend got caught street racing and got a tix for it even tho he didnt exceed the speed limit.

 

damn thats harsh. Im sure cops here would be dicks about it too, its not that hard to miss a "street race"

i maen if u see two cars going to 45 or 55 whatever the limit may be in like 5 seconds u can pretty much assume what was goin down.

 

I just want the supercharger just to try it out, i am into trying new things out

 

thanks a lot sdhotwn...that's some really good information. i've never heard any of that before. and i've been looking into FI for months. about what you said about people not wanting to listen to the shortcomings though...I just don't think the information was out there. I think what you just put out will get a lot of people who just aren't as educated as someone like you to start thinking about what type of FI they want. I know i'm thinking about switching to the RRM turbo. do you know anything about why some of these people's engines blow up when they put on a turbo?? like can you pinpoint the reason for the blow? And also, do you know if RRM's turbo is one of those turbos with "0" lag? also, any info other than that that you may have will be GREATLY greatly appreciated. thanks.

 

people that have blown their engine are people that have raised their boost above the recommended limits without reinforcing their internals; mainly the pistons and rods. RRM is very clear as to what boost the engine can hold without bolstering, but some people just don't listen.