Thanx for clearing most of my questions up...Now I will try to do rest f the basic
bolt-ons and then if I have any money left..I'll go for the headwork..
Thanx,
Greyson
>
>
> --- Greyson Crowe <[EMAIL PROTECTED]> wrote:
> > I remember reading a post saying that our GA16DE's
> > had cylinder heads meant for economy. Well I
> > thought I might pull my head off and have it
> > hot-tanked and replace the gasket, while at the same
> > time having it milled down and possibly ported an
> > polished. When done I might also add an SE-R
> > throttle bodie and fuel pressure regulator to help a
> > little.
>
> Unless a JWT ECU is used modifications to the throttle
> body are useless because the motor cannot rev to where
> the throttle body makes a difference.
>
> For a throttle body to help you need to do all of the
> basic bolt on's plus cams and ECU, otherwise the
> engine does not breath enough to use the extra flow.
> This has been proven through dyno testing.
>
> So don't bother with headwork untill you have all the
> basic bolt on mods plus cams, then TB work and head
> work are probably going to be benifical.
>
> I will say this again, a SE-R throttle body is useless
> untill you get to the 115 hp to the wheels mark, which
> is all bolt ons plus ecu and cams. All of the power
> gains that a throttle body gives is beyond the rev
> range of the stock ecu.
>
> You will feel better throttle response but put the car
> on a dyno and you will find zero power gain.
>
> A fuel pressure regulator is useless also on most MAF
> equipped cars, the GA16 included. The A/F ratio is
> slightly rich to begin with. Upping the fuel pressure
> will only reduce power. We proved this by testing with
> a Horiba broad band A/F ratio meter. In fact the JWT
> ECU is leaner than stock.
>
> See the stuff on engine performance under the
> technical section of sentra.net. The modifications
> listed are proven and dyno tested and the dyno chart
> is avalible to look at also. This should seperate the
> hype from the truth over what works for the GA and
> what does not.
>
> As for the thread on exhaust pipe diameter, 2.25 is
> TOO BIG for an all motor GA16 even if it is built to
> the limit of what is avalible now. A 205 HP SR20 lost
> power going to a 2.25 header collector and
> experimenting with a 2.5-2" cat back made no
> difference in top end power. Pipe diameter is dyn o
> proven by Mike Saiki and myself and Bob Legere, who
> probably knows the most about GA16 power.
>
> For those of you that insist that you have better top
> end with no loss in bottom end power, I challange you
> to produce a dyno chart that shows it.
>
> So beware of hype and of what people who call
> themselfs "experts" tell you unless they can show data
> and facts. I am no GA16 expert but I can show you
> data, it's all on sentra.net now.
>
> Mike
>
>
>
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