<< By the time you add economy of scale, the home made supercharger kit will
have less power and be more expensive than a turbo kit as well as less
powerful.>>
Oh, and by the way this isn't a homemade kit I am talking about.
Also, can you say less power one more time?
lol,
Tom
----- Original Message -----
From: "Mike Kojima" <[EMAIL PROTECTED]>
To: "Sentra Mailing List" <[EMAIL PROTECTED]>
Sent: Thursday, October 26, 2000 1:05 PM
Subject: Re: SML: Boost/Turbo/Stock internals
>
> "Joe" wrote:
> >>The idea is to make a semi-high horsepower engine mod for the everyday
> >>driver that wouldn't require changing the stock internals. At roughtly
> >>180-190hp (with IMMEDIATE boost) this would make our car fun to drive,
> >>and much cheaper than the turbo.
>
> Then "Dick" wrote:
>
> >Correct me if Im wrong, but isn't a turbocharged engine more thermally
> >efficient than a supercharged engine. This would mean that a turbo
> >converts
> >your chemical energy, (gas), into work, (hp) at a better rate than a
> >supercharger.The plus side being you would use less gas to achieve the
same
> >level of power output in a turbocharged engine compared to that of a
> >supercharged engine. The negative side being that you would have to wait
> >for
> >the power since it is not (IMMEDIATE boost). They are many other pro's
and
> >con's to consider too. just throwing in my $.02
>
> Jaivier is totaly correct in the fact the turbo's are more efficent and
can
> produce more power. Turbo kits are fully reliable if they are engineered
> and made correctly. Superchargers are inferior from a power standpoint.
> Centrifugal superchargers like Vortech are even more laggy than
> turbochargers unless they are overdriven with a top end by pass valve in
> which case they are totlay inefficent. Positive displacement
superchargers
> like the Eaton used in JR kits have poor adiabatic efficency but have a
nice
> fat powerband and are very pleasent to drive, feeling like a bigger stock
> engine. The power potential is limited to perhaps 30-50 more hp with
these
> kits.
>
> Making a positive displacement supercharger kit is difficult because you
> need to either cast or heavily modify a stock manifold as well as machine
> drive pulleys and devise a off throttle bypass valve. You must bypass all
> light throttle boost or the motor will soon blow up.
>
> A centrifugal supercharger kit is easier because it packages better with
the
> stock manifold but you still need to make brackets and drive pulleys., you
> still need to bypass off boost presure. The centrifugal blower is easer
to
> intercool also. The main issue will be it's lag, it is like bad turbo lag
> without the power that the turbo can produce.
>
> I have a lot of resourses avalible to me after being in the racing
industry
> for many years, but I still won't do a supercharger kit. I would rather
> leave it up to JR and Vortec who would do it better, if you can convince
> them that there is a market.
>
> By the time you add economy of scale, the home made supercharger kit will
> have less power and be more expensive than a turbo kit as well as less
> powerful.
>
> Mike
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