The first three TB's took approx. 8 hours to modify but this included
tooling to hold them in the mill and lathe. All three are in different
stages of modifications.
The one that Bruce has is offset bored (three steps to the modifications).
This was just the first step and we upped the flow by 13%. The second has
larger bores
for larger throttle plates (straight bores with an 8 degree air horn). The
second will be flowed before I install it this weekend. The third is very
similar to the first
that Bruce has but is an earlier TB (1995), and will be tried on Brian's Dak
(1993 5.2L). Were taking this in steps and hopefully as we work through this
we will
know what we can get away with (ECM problems). Hopefully we can come up with
one or two configurations that will work for all without ugly side effects
like a
loss of low end torque or high end lean conditions. I think that the last
step in this process will be to mill off the air horns and see what type of
flow numbers we
get. Once were happy with our modifications, then the work will be performed
on an CNC mill and should only take approx. 15 minutes for the TB. I'll make
up
the throttle shafts in a conventional mill and should take less than 30
minutes per shaft. Right now were still in the prototype phase and we don't
know what the
final configuration will be (I tend to be very conservative in my approach
and do not want a check engine light). I also want to keep the mods as
conventional
looking as possible and as clean as possible so we don't have any smog
problems. After installation on my truck this weekend, I will be running my
truck on a
dyno to quantify the changes. The dyno that I will be using is a true dyno
(Clayton Engineering with full data logging), and I will be looking at the
exhaust before
the CAT so we will know what the fuel/air ratios are throughout the pull. If
we should go too far with the larger plate throttle body, we plan on working
with Jet
to get a custom chip to match the air flow. Actually the time spent
prototyping is what takes the longest. Shipping UPS 3 day is actually pretty
cheap. The good
thing about this process is that the first (stock plates), according to
Bruce is working great with no side-effects so if we go to far with the
larger plates, we can
always fall back to the first mod.
Frank
> -----Original Message-----
> From: Boog318@aol.com [SMTP:Boog318@aol.com]
> Sent: Tuesday, September 01, 1998 6:55 PM
> To: dakota-truck@buffnet.net
> Subject: Re: DML: RE: RE: franks TB!!RE: Magnum Performance Throttle
> Body?
>
> Frank,
> How long does it take you to do this? I live in MD. Shipping would kill
> me,
> but it may be worth-while.
> Boog
> 92 318 4x4
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