Im wondering what I would like better a 530rwhp NA 402 or a 600-630rwhp D1SC procharger on a forged 347. Now I dont have the money for the cubes and the D1. Its one or the other...for now atleast.
Im just curious those of you that have had a big powered NA motor and a high HP FI setup...which do you like the best? Which is more fun on the street? which was faster overall?
Cubic inch to cubic inch FI almost always produces more horsepower and torque and, on the street, is often faster and hence more "fun" as well.
That said, I too prefer NA and will take a NA car over a FI car, especially on the track, any day. NA engines are usually more reliable, have more predictable throttle response and other characteristics that lend themselves to racing in more than a straight line.
Adding to what Gimpy said, I agree that on the street a FI engine is certainly more streetable than a NA engine with a big cam and on/off clutch. FI engines can also make more H.P. & Tq. given the same cubic inch displacement. They stand a better chance of passing emissions as well.
However, their drawback is the heat generated as well as their complexity and potential for over boost, etc. Combine that with the often somewhat more unpredictable and/or sudden nature of their throttle response and they are not as suitable for the track.
That said one can certainly make a NA car fast and still drivable, both on the street and the track but there is a point where it becomes virtually undrivable. For example, you really wouldn't want to drive a World Challenge cammed car on the street, especially with a small diameter carbon/carbon clutch. Ask Short Throw on the other forum about that. Of course most everyone here already knows/knew that and is what Gimpy was alluding to.
This brings up a point I stated the other day: the current LS7 is possibly the endpoint as far as production NA engines are concerned and future engines which produce more H.P and Tq. may very well be FI. The "Blue Devil" project, assuming it comes to market, may very well be a sort of test case for this design philosophy.
Think of the 04" Z06 with its carbon fiber hood. GM determined they were able to produce a carbon fiber body panel that allowed a Class A finish. That may be one of the reasons they were produced in relatively low numbers, just as the BD will be. Call it a public beta test of sorts. Then, lo and behold, carbon fiber was used in several places on the C6 Z06.
Historically speaking there is precedent within the various GM engineering and design divisions for this. There have been developments that were first seen on various vehicles, first in limited quantity and then later mass-produced. As most suspect there will likely be even more use of carbon fiber on the "Blue Devil". It seems GM likes to start small, sort of test the waters if you will, before committing to more mass production usage. I can't say I blame them.
Yes indeed, at one time or another we've all been GM guinea pigs. I don't mind though. I've been a professional guinea pig for many years.
Nothing drives like positive displacement (with small throttled volume)
I was na with h/c/e and it couldn't get out of its own way down low.
Turbos and centris are weak down low and unless you're not making any real power , they come on all at once which is not ideal (IMO)
Long intake tracts tend to feel a little spongy.
Roots blowers are heat pumps, so.....
twin screw it..no other option makes sense (to me)
A/W setups are misunderstood by most. A little common sense and heat soak is a non issue.
If you do go FI, DO NOT under any circumstance put an IC or heat exchanger in front of the rad..that has to be one of the dumbest ideas anyone ever came up with (on any car)
I have driven just about any combo someone could have come up with and have personally owned blower cars, stock cube head and cam cars, a twin turbo car and 2 big cube N/A engines so I feel I have the experience to make some good comparisions. It boils down to what your personal preferance is and what you do with the car. They all have their positives. Road racing we just do N/A stuff. Drag racing can do either one. Show cars we prefer the blowers because they are pretty Forced induction is a lot easier to drive and will make a lot more power than an N/A engine with much smoother street manors. The more power you want N/A the more aggressive the car becomes. Some people are not willing to put up with that. Anyone has any questions, just let me know..
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Forced induction is a lot easier to drive and will make a lot more power than an N/A engine with much smoother street manors. The more power you want N/A the more aggressive the car becomes. Some people are not willing to put up with that. Anyone has any questions, just let me know..
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