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RSRROB,
Your right about the power loss amounts...the rate of power loss when =
gaining elevation is about 4.5% per thousand once above 3500 or so (up =
to about 14,000 then it gets worse), I don't remember the exact =
amount... Insert "but" here.
The reasoning for my question of FZR headers on the GTS was simply to =
find-out if it was possible, or if anyone knew of a better =
set-up/upgrade path for the GTS, with pipes or a better fuel mapping =
via a chip upgrade? I agree with you that in higher elevations the power =
loss is due to thinner atmosphere, less air in the combustion chamber =
means less power. So yes, a turbo is one answer, or as someone else =
pointed out I could just crack the throttle open a bit further to gain =
more power.=20
I would still like to hear any feedback on the header/Exhaust thingy? =
Has anyone done anything here? I might be wrong but it seems that if =
your engine breathes better at any altitude it will have more power. As =
far as re-chipping the engine goes, I'm not sure what would happen to =
the drivability at higher altitudes but if I could gain an additional =
15-20 + horsepower with a better air filter, chip upgrade and exhaust =
system that would be fine with me. Lugging a 615 lbs ++ bike and my 215 =
lbs up some of those steep roads with the stock bike is not to bad until =
you try and pass a slow moving truck and its usual cars in tow. Then it =
feels like an older, overloaded 500cc bike! Uuuggggg. Experiencing this =
major lag in power, especially above 8500' was enough for me to ask the =
group if there are any upgrade paths.=20
So are there?
Charlie D
94GTS1K-A
----- Original Message -----=20
From: [EMAIL PROTECTED]=20
To: Multiple recipients of list=20
Sent: Tuesday, September 19, 2000 6:01 PM
Subject: Re: GTS to FZR stuff
In a message dated 9/19/00 5:17:52 PM Eastern Daylight Time,=20
[EMAIL PROTECTED] writes:
<< I take my bike into the Mountains
frequently and once above 6000ft or so it starts to lose a =
significant
amount of power. It seems an exhaust would help this, I'm also =
looking into
re-chipping the bike if any one has any experience with that. >>
>From watercraft racing, and taking boats from Fl to denver, it is not =
the=20
exhaust that is killing you. It is lack of compression. In thinner =
air, you=20
are just not getting as big a bang inside the cylinders that you do at =
lower=20
altitudes. The problem is not evacuating the cylinder, it is getting a =
more=20
powerful explosion. The watercraft race engines run the same exhaust, =
but=20
higher compressions to compensate for the altitude. There is some rule =
of=20
thumb formula that escapes me now, mainly because I live in Florida =
and it=20
doesn't apply, but something to the effect of 10~15% decrease in HP =
per 3000=20
ft. Your stock exhaust still flows fine at altitude, it just doesnt =
have=20
enough to flow through it. This gets back to the engine flow balance =
theory.=20
You can have an exhaust that flows 200 CFM, but if the head or intake =
only=20
flows 100 CFM, that will be your bottle neck. Increasing the exhaust =
to 300=20
CFM will not produce anymore horsepower because it was not the =
limiting=20
factor.
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<BODY bgColor=3D#ffffff>
<DIV><FONT face=3DArial size=3D2>RSRROB,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Your right about the power loss =
amounts...the rate=20
of power loss when gaining elevation is about 4.5% per thousand once =
above 3500=20
or so (up to about 14,000 then it gets worse), I don't remember the =
exact=20
amount... Insert "but" here.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>The reasoning for my question of FZR =
headers on the=20
GTS was simply to find-out if it was possible, or if anyone knew of a =
better=20
set-up/upgrade path for the GTS, with pipes or a better =
fuel=20
mapping via a chip upgrade? I agree with you that in higher elevations =
the power=20
loss is due to thinner atmosphere, less air in the combustion chamber =
means less=20
power. So yes, a turbo is one answer, or as someone else pointed =
out I=20
could just crack the throttle open a bit further to gain more power.=20
</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>I would still like to hear any feedback =
on the=20
header/Exhaust thingy? Has anyone done anything here? I might be wrong =
but it=20
seems that if your engine breathes better at any altitude it will have =
more=20
power. As far as re-chipping the engine goes, I'm not sure what would =
happen to=20
the drivability at higher altitudes but if I could gain an additional =
15-20 +=20
horsepower with a better air filter, chip upgrade and exhaust system =
that would=20
be fine with me. Lugging a 615 lbs ++ bike and my 215 lbs up some of =
those steep=20
roads with the stock bike is not to bad until you try and pass a slow =
moving=20
truck and its usual cars in tow. Then it feels like an=20
older, overloaded 500cc bike! Uuuggggg. Experiencing this =
major lag in=20
power, especially above 8500' was enough for me to ask the group =
if there=20
are any upgrade paths. </FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>So are there?</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Charlie D<BR>94GTS1K-A</FONT><BR></DIV>
<BLOCKQUOTE=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A [EMAIL PROTECTED] =
href=3D"mailto:[EMAIL PROTECTED]">[EMAIL PROTECTED]</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
[EMAIL PROTECTED]=20
href=3D"mailto:[EMAIL PROTECTED]">Multiple recipients of =
list</A>=20
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Tuesday, September 19, =
2000 6:01=20
PM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: GTS to FZR =
stuff</DIV>
<DIV><BR></DIV>In a message dated 9/19/00 5:17:52 PM Eastern Daylight =
Time,=20
<BR><A href=3D"mailto:[EMAIL PROTECTED]">[EMAIL PROTECTED]</A>=20
writes:<BR><BR><< I take my bike into the =
Mountains<BR> frequently=20
and once above 6000ft or so it starts to lose a =
significant<BR> amount of=20
power. It seems an exhaust would help this, I'm also looking=20
into<BR> re-chipping the bike if any one has any experience with =
that.=20
>><BR>>From watercraft racing, and taking boats from Fl to =
denver, it=20
is not the <BR>exhaust that is killing you. It is lack of compression. =
In=20
thinner air, you <BR>are just not getting as big a bang inside the =
cylinders=20
that you do at lower <BR>altitudes. The problem is not evacuating the=20
cylinder, it is getting a more <BR>powerful explosion. The watercraft =
race=20
engines run the same exhaust, but <BR>higher compressions to =
compensate for=20
the altitude. There is some rule of <BR>thumb formula that escapes me =
now,=20
mainly because I live in Florida and it <BR>doesn't apply, but =
something to=20
the effect of 10~15% decrease in HP per 3000 <BR>ft. Your stock =
exhaust still=20
flows fine at altitude, it just doesnt have <BR>enough to flow through =
it.=20
This gets back to the engine flow balance theory. <BR>You can have an =
exhaust=20
that flows 200 CFM, but if the head or intake only <BR>flows 100 CFM, =
that=20
will be your bottle neck. Increasing the exhaust to 300 <BR>CFM will =
not=20
produce anymore horsepower because it was not the limiting=20
<BR>factor.<BR></BLOCKQUOTE></BODY></HTML>
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