Ahh....so it was a .02 sensor causing the lean condition and
not just the larger bores in the stage II TB. I know its a very
complicated process, researching and modifying the TB's to work in
certain power bands on specific engines. I thought with the mods he
had and with a larger TB, it might have been running a little lean.
Obviously there is more to it than just trying to richen the mixture
with the IAT. Still curious about it tho.
GS -
Frank.T.Holloway@KP.ORG wrote:
>
> GS,
>
> The lean condition that I was experiencing with my truck was the result of
> an O2 sensor stuck on the rich side. When the O2 was replaced, the problem
> went away. The problem with TB modifications, is that you need to keep the
> velocity up to get accurate MAP signals to the computer. The larger bores
> can be made to work, but it requires computer mods to get it right (alter
> MAP variables to the computer). Larger bores are needed when you clean up
> the intake track (port work on the heads and intake) but these require
> computer mods anyway. Any work on the TB's really does require the
> assistance of a flow bench. Its not just a matter of removing the venturi
> above the plates. The shrouding was placed in there for a purpose and the
> computer was programmed with this in mind. The shrouding serves and is a
> part of the total power band. Removing it does give the feeling of more
> power (just above idle) but you need to look at the total power band,
> because power is lost. The shaft even plays an important part of the total
> equation. Any change in velocity is read by the computer. With the bigger
> bore TB's we have been playing with, the torque and HP figures along the
> whole powerband are variable, at certain RPM's they are higher and at
> others, they are lower than stock.......
>
> Frank
>
> > -----Original Message-----
> > From: GS- [SMTP:GSWillhite@ualr.edu]
> > Sent: Friday, August 27, 1999 7:43 AM
> > To: DML
> > Subject: DML: Re: Dyno Check RD 52mm TB vs Stock
> >
> > >
> > > I did a HP check with JBA headers, JBA down tubes, K & N Gen II, ASP
> > > crank-pulley,
> > > Bullet 3" by 24" muffler and 3" piping cat back to the rear axle. The TB
> > > is stock
> > > HP 222.3. I lost HP with the RD 52mm TB. That dyno check had 209 HP. BTW
> > > the 52 mm TB makes a excellent paper weight.
> > >
> > > --
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