Frank;
FWIW!!!
I have done a little something different on the throttle shaft. I have
removed 1/2 of the shaft, the side that the bolts go through, then you can
cut the back side just a little and use #10/32 round head machine screws and
bolt the plates to the shaft.
This seemed to wake up the engine a little.
colin
Holloway,Frank T wrote:
> Patrick,
>
> I started work on two throttle bodies today and I found some
> real interesting things. I was concerned about a dead spot off idle, and
> was thinking about
> re-clocking the TPS. I talked to one of my friends at Chrysler,
> it turns out that re-clocking will not work. The ECM on startup looks
> for the lowest voltage from
> the TPS and sets the voltage as baseline (no adjustments). I did
> flow one of the stock TB's at different throttle settings so I have a
> baseline for my work. One
> of the TB's will get 52MM plates (approx. 2.040 inch). The other
> will use the stock throttle plates ( just under 2.00 inch). The stock
> TB's are actually necked
> down just above the plates ( this is actually there to shroud
> the half of the plate(s) that swing up). Un-shrouding occurs at approx.
> 15 degrees throttle
> movement. On the TB that will receive stock plates, I opened the
> bore above the plates .040 inch, and then I took and additional .020
> off the bore on the
> back side (rear of the engine where the plates swing down). and
> blended the work to the actual bore where the plates are positioned. On
> the TB that gets the
> big plates, I just bored the TB to match the plates. The next
> step will be to place both TB's up in one the lathes (4 jaw chucks work
> nice to center the bores)
> and open up the air horn and remove the web between the bores.
> The shafts will be the next (mill flats above and below the plates. I'm
> hoping to finish both
> tomorrow and then off to the flow bench. I'll give you the flow
> numbers when I'm done. I do have your TB down at the shop. Tomorrow I'll
> take the IAC, MAP,
> and TPS off. It should be on its way to you either Monday or
> Tuesday.
> Frank
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