Could someone clearify what an "A-B" Test is??
--- finspeed <[log in to unmask]> wrote:
> >> I suggest you check with Marc Haibeck this coming weekend in Vegas
> >> verify the accuracy of the below statement.
> > Have you verified and confirmed Marc's presence in Vegas this
> Mr. Haibeck did arrive in Nevada late last night.
> He was present at the "techie coffee break" at the Santa Fe Station
> hotel/casino this morning. A good part of that was taken-up by a
> discussion of removal of secondary port throttles and their ancillary
> parts. Marc led the discussion but additional input came from a
> number of
> people in the group of 20 or so who were present.
> I'll leave it to Marc to repeat his comments in detail but the
> summary is:
> 1) SPT removal can cause noticeable but modest changes in drivability
> between idle and 2000-2500 rpm.
> 2) Above 2000-2500 rpm there are no drivability issues with SPT
> 3) He is aware of two "A-B" tests of engines which have had SPTs
> and neither showed any change in performance. Interestingly, one of
> tests was conducted by "peter" who uses the address
> <[log in to unmask]>
> 4) There is little reason to remove the system as it's, generally,
> problematic and, even when it is, it's not difficult to diagnose or
> 5) A few engines have broken SPT shafts but, to date, they've only
> large displacement engines built by Lingenfelter with SPT shafts
> were "streamlined" or "knife-edged".
> 6) In the future, if SPT parts either get too expensive or are
> discontinued, there may be good reason for widespread SPT removal as
> cost saving strategy.
> 7) Marc detailed the full, SPT removal procedure, which is a bit more
> complicagted than what I've posted here previously. Perhaps, at some
> in the future, Marc may post to the list and correct my
> version of the task.
> I should add that the most revealing part of Marc's discussion was
> #3. I
> was under the mistaken impression that SPT removal would increase
> performance, however, with two different A-B tests refuting that
> theory... clearly, I was wrong.
> I'd like to compliment Col. Ron Hanselman and his Organizing
> who have put on this ZR-1 Net Registry "Las Vegas West Gathering".
> They've all worked very hard and the event shows it.
> Lastly, even if the event didn't live-up to its billing, Denise
> Hanselman's yummy chili dogs were worth the trip to Nevada!
> Hib Halverson
> Problems? Contact Dave Bright at: [log in to unmask]
> TOPICS: TECH: or NONTECH:
Problems? Contact Dave Bright at: [log in to unmask]
TOPICS: TECH: or NONTECH: