33 Coupe Adjusting and Tweaking 2
3/25/06
If you've been following along up to
this point, you'll know what I'm going to be talking about but if you've
just dropped in, let me catch you up on a thing or two.
When I finally got the car on the road back in
January, I had to find out how those big tires were going to work. The
only way to find that out was to take the car out to some remote area
and whack the throttle. The first thing I noticed was that those
16.5" wide tires spin real easy. The second thing is the car goes
pretty straight with two people in it but doesn't go very straight with
just me. I didn't know why the car was doing that so I talked with Gary
and he said that it sounded like suspension. Gary said to put the car on
a rack (I wish I had one) then adjust the 4-link bars so they're all
in a neutral position and then preload the
top-right bar (passenger side top) by shortening it by one half turn.
What you see below is a poor mans rack. It was
just high enough off the ground to work under it and to have the cars
weight on all four tires. With the car off the ground, I needed to get
all four bars in that neutral position. To me this sounded easy but
was much harder than I expected because I only have one end that can be
adjusted on each of my 4-link bars. That meant that I would have to
remove the bolt from one end of the bar, turn the rod-end (the adjusting
part) a few turns till I had all of them in there neutral position and
then replace the bolts. Now to do all this I had to use my floor jack
along with a soft-faced hammer to remove some of the bolts. This didn't work as planned because as I was
trying to adjust one bar after removing it's bolt, I couldn't get the
bolt back in after adjusting it. I tried removing both top bars and then
tried it again. This seemed to work so it was time to do both bottom
bars. After doing the same to the bottom two, the top were tight again.
I did this back-and-forth a few times only to find myself with my pinion
angle all wrong. I hade worked myself into a hole at this point.
What I ended up doing was adjusting the pinion
angle back to where it was right again and said good enough for now.
What I really need is a set of 4-link bars that adjust at both ends
(right-hand on one end and left-hand on the other end) so I wouldn't
have to remove any bolts. This might be something I'll do in the near
future if I can't get the car to go straight.
I took the car back out after all this and it went
a little straighter. This means I must have done something different, which is a
good thing, but it still wants to go left. It's much better when there's
someone else in the car still so I have more tweaking to do.
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3/26/06
After I was through testing the suspension out, I
let the car sit for about three weeks because of all the rain we had. It
rained two weekends in a row and I was gone on the next one so I didn't
get a chance to do any cruising in that time. I thought this would be a
good time to change the oil now that I have a few miles on it so back
onto the "rack" it went. When I tried to start the engine, the battery was
dead so out came the charger. That's the trouble with having modern
electronics in a car these days, the battery has to run two things in my
case. One is the radios presets and clock and the other is the computer
for the transmission. The settings for the transmission are of greater importance
to me than the presets on the radio but this is the price you pay to
have a street rod.
While I was charging the battery, I figured that I
would change the oil. I wanted to look at the old oil very carefully to
see if there was anything else in it other than just oil, so I cleaned
out my oil-drain-pan before I removed the drain plug on the car. After
the oil pan on the car was empty, I poured most of that oil from the
drain-pan into a five gallon container and then started my investigation
for anything foreign. This left me with a thin layer of oil in the
bottom of my oil-drain-pan to work with. I could see that there wasn't
anything large, which was a good thing, so then I used my fingers to root
around the remaining oil. I used my fingers to check out the remaining
oil because they can feel the smallest of items. Everything looked good
so the rest of the oil was drained into my five gallon container and I
was a happy guy. The only thing I didn't check was the oil filter but I
still have it and will check it very soon. By cutting open your used oil
filter, you can find out a lot about what's going on inside your engine.
If there were some kind of metal trapped inside it, this would be the
time to find out where it came from and then maybe tear the motor down
and find out what happened. If you were to let it go knowing that there
was a problem, you might be playing with fire so this is a good way to
see what's going on.
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One other tweak that needed to be addressed
was the carburetor. When I pressed hard on the throttle, it still had a
slight hesitation (bog) to it and that needed to be fixed. I had bought
two different sizes of accelerator pump discharge nozzles, or squirters
for short, which were # 35's and # 37's but they didn't fix it completely
so I was ready to change all that without buying any more.
To give you a little history about the sizes of
squirters, the # size refers to the diameter of the hole in the end of
the nozzle, not a drill # size. What I'm going to do is drill out the
nozzles in the squirters a little larger till I get the hesitation to go
away.
By using a pin-vise to hold your drill with, you
end up with a lot of control while your drilling. If you were to use a drill
motor to do this in place of a pin-vise, you could end up with a hole
that isn't very true (larger on the side that your drilling from). It
only takes a minute per nozzle so it's not a big deal using a pin-vice.
I had a few squirters hanging around so I used one of them to do my surgery
on. I started with a # 31 and drilled a .040" diameter hole through
both nozzles which would make my new one a # 40. After driving the car
around for a test drive, that made a big difference so now it's time to
drill out another to the next drill size which would be .041"
diameter. Why am I going to drill out another one when this one made the
car work better?
Well, if you want to find out where the limit is
when doing something like this, you have to go "over" the
limit to find it first, so I'll continue drilling out squirters till I
find the limit and then back off one notch and that should be the one to
use. It's not rocket surgery but it's one way to do it that will work.
The only thing you have to have while doing it this way is to have at
least two squirters to work with. Once you have the right size that
works on your on your engine, you should either write the numbers down
on paper and keep the paper in a safe place or scribe the number on the
squirter with something. I like to use a Dremel for a job like this
because I might lose the paper. This way I can use the Dremel to cross
out the original number and put the new one below the old number.
Whatever works is what I say!
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The last tweak that I did on the this test drive was adjust the transmission. The trans was shifting way too
soon for my liking (at low RPM it shifted too early) and way to soft
when I was up on the RPM so by playing with the Compushift electronics,
you can set it just about anywhere you want. There are two areas that
you can adjust: 1) when the engine is off and 2) when the engine is
running. I wanted to adjust the shift pressure and the throttle position that
the shift took place at. Lets say that you wanted the car to shift nice and
easy while driving around town. No problem. Just adjust the throttle
position so the trans shifts around 5% to 15% throttle and you
should have a nice smooth shift while cruising. Tell it when your into
the gas around 50% or more that you want a much firmer shift and it will
bark the tires for you. It's like having a shift-kit in your trans but
it only works when your on the gas hard and not all the time. After
pushing a few buttons, the car was closer to what I wanted so I'll try
it at these setting for a while and see if I like or not. If not, it's
easy to change again.
Drop back by in a week or two because I should
have another couple of things that need tweaking on, plus I'll find if
these changes worked or not.
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