OBD2 solutions
Curtis Mittong
poohbear at twd.net
Thu Jun 3 05:35:53 GMT 1999
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Thanks all for your inputs.
>I dont thing the stock
>ECM runs into limits, rather the sides of the injectors required to
>fuel things make the idle bad.
This is good. I didn't know that larger injectors made potentially rough
idles. Its stuff like this that I need to know.
>Now maybe if you went with solid lifters and raised the
>rev limiter to 7k+ you could get that kind of hp, but I don't think
>most people class solid lifters as streetable, and the engine life
>with that stroke and high rpms would be severly limited.
>Now there are a few people getting over 600hp on a streetable Lt1 but
>they are all using large blowers (close to 20psi or more), or large
>N2O shots.
Do you think that maybe 4-valve heads could support alot more accurate flow
with hydraulic lifters? I agree that solid lifters aren't the answer. I
built a 455 pontiac with solids and the 3000 mile adjustments started
getting to me. (it had 522 at the rears, but the constant 104 octane bills
hurt too) As far as the RPMs, I couldn't take it over 6500 and feel good
about the longevity of the package. I guess what I'm thinking is that if
592 is possible with hydraulic lifters, maybe 600+ is possible. I need to
find that writeup and give you all the specs on that LT1 that CHP mag built.
I'm still trying to find the final verdict on the cylinder walls. I thought
they were too thin to even go 30-over, but I read about a kit for LT1s that
was a 414 ci stroker kit that called for a 60-over. They also have 4.125"
stroke cranks, but I thought for sure you would be into the jackets
clearancing that. Whooda thunk it?
>idled beautifully... BLM at 128 and INT bouncing between 127 and 129.
>WOT was very pleasant as well with the injectors only about 60% duty cycle.
Ummm.... BLM? INT? Big Loud Motor? Impressive New Trailer?
Curtis Mittong
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<DIV><FONT color=3D#000000 size=3D2>Thanks all for your inputs. =
</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT> </DIV>
<DIV><FONT color=3D#000000 size=3D2>>I dont thing the =
stock<BR>>ECM runs into=20
limits, rather the sides </FONT><FONT color=3D#000000 size=3D2>of the =
injectors=20
required to<BR>>fuel things make the idle bad. =
</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT> </DIV>
<DIV><FONT color=3D#000000 size=3D2>This is good. I didn't know =
that larger=20
injectors made potentially rough idles. Its stuff like this that I =
need to=20
know.</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT> </DIV>
<DIV><FONT color=3D#000000 size=3D2>>Now maybe if you went with solid =
lifters and=20
raised the<BR>>rev limiter to 7k+ you could get that kind of hp, but =
I don't=20
think<BR>>most people class solid lifters as streetable, and the =
engine=20
life<BR>>with that stroke and high rpms would be severly =
limited.<BR>>Now=20
there are a few people getting over 600hp on a streetable Lt1 =
but<BR>>they=20
are all using large blowers (close to 20psi or more), or =
large<BR>>N2O=20
shots.<BR></FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT> </DIV>
<DIV><FONT color=3D#000000 size=3D2>Do you think that maybe 4-valve =
heads could=20
support alot more accurate flow with hydraulic lifters? I agree =
that solid=20
lifters aren't the answer. I built a 455 pontiac with solids and =
the 3000=20
mile adjustments started getting to me. (it had 522 at the rears, =
but the=20
constant 104 octane bills hurt too) As far as the RPMs, I couldn't =
take it=20
over 6500 and feel good about the longevity of the package. I =
guess what=20
I'm thinking is that if 592 is possible with hydraulic lifters, maybe =
600+ is=20
possible. I need to find that writeup and give you all the specs =
on that=20
LT1 that CHP mag built. I'm still trying to find the final verdict =
on the=20
cylinder walls. I thought they were too thin to even go 30-over, =
but I=20
read about a kit for LT1s that was a 414 ci stroker kit that called for =
a=20
60-over. They also have 4.125" stroke cranks, but I thought =
for sure=20
you would be into the jackets clearancing that. Whooda thunk=20
it?</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT> </DIV>
<DIV><FONT color=3D#000000 size=3D2>>idled beautifully... BLM at 128 =
and INT=20
bouncing between 127 and 129.<BR>>WOT was very pleasant as well with =
the=20
injectors only about 60% duty cycle.</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT> </DIV>
<DIV><FONT color=3D#000000 size=3D2>Ummm.... BLM? INT? Big =
Loud=20
Motor? Impressive New Trailer?</FONT></DIV>
<DIV><FONT color=3D#000000 size=3D2></FONT> </DIV>
<DIV><FONT color=3D#000000 size=3D2>Curtis =
Mittong</FONT></DIV></BODY></HTML>
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