Re: I-5 10v NA power?

["Wm. Josiah Erikson" <werikson@hampshire.edu>]

WHY isn't it tunable? That's odd. Seems strange to me that the VW 1.8 I-4 is easily
tunable to beyond the stock horsepower of a JT. Throw a euro dist, header and good
exhaust, mild (g-grind) cam on and machine the head down to 10:1, and presto! you
have 120bhp from a JH I-4. What's the difference? I'd think you'd be able to get
150bhp from the JT. Why not?
    Maybe I'm just being silly.
    Thanks for putting up with me : )
    -Josiah


Ken Keith wrote:

> Andrew Duane USG <duane@hunch.zk3.dec.com> wrote:
> >
> > Put in a new low-restriction exhaust, and a Schrick cam, and
> > a K&N filtercharger, that will be good for about 20 more HP,
> > but at a cost of drivability and idling and low-end torque.
> > Cost is about $1500 total.
> >
> > The 10V NA motor is not really tunable, I have one myself.
>
> I would think that those mods would result in less than a 20 HP increase.
>
> Which Schrick do you mean?  I had a 268/272, K&N, and exhaust, and I'm not sure
> it was all that much better.  But then again, my butt is not a finely
> calibrated dyno, either.  I don't know that I know what 20 extra horses feels
> like.
>
> No idle problems either, hence my wondering which duration cam.  Didn't lose
> much low end torque.  Gee, I guess I disagree with everything!  Except that the
> 10V NA is not really tunable.  Great motor though.
>
> Ken