Newbie needs explanation...

[Bruce Plecan]

-----Original Message-----
From: David A. Cooley <n5xmt at bellsouth.net>
Subject: Re: Newbie needs explanation...

Was just looking at a syclone run, and the only over 15 msec times I found
were at
like 2,700 rpm.  Not WOT, but was at 15 PSI
Bruce


>>Thanks for the reply; things are sort of like I figured.
>>
>>According to a GM spec sheet I got, BPW (Base Pulse Width) is the *result*
>>of a calculation w/ several multipliers.  Guess I don't understand this,
>>then.  When running a scan tool, I get BPW (units = milliseconds) readings
>>of from zero (on deceleration), to 19 @ WOT & hi rpm.  (I was wrong w/ the
>>15 figure on my last post).
>Sounds normal
>>Are these figures consistant w/ what you'd expect?  The 19 figure came @
>>4050rpm, the highest speed reached (this thing shifts @ too *low* an rpm -
>>gotta fix that!).  At this speed, we have 14.8msec/crank revolution - duty
>>cycle comes out to be *more* than 100%...?????  If we figure on two crank
>>revs per power cycle, 19msec / 29.6msec = 64% duty cycle - this makes more
>>sense to me.
>Yep... 64% is the correct figure.
>>Before I start playing w/ this thing, I've got to *understand* exactly
what
>>I'm doing and how it works in stock trim - lean mix on a turbo engine can
>>mean sudden death, and I *really* don't want that to happen!!
>Check over at the Syty web site for the addres of the Syty email list.  Web
>site is: http://www.syty.org/
>They've already hacked the code in the chip and have TONS of great info and
>know what works and what grenades motors!
>One thing you don't want to do on the STOCK (internally) Syty engine is
>raise the RPM's... it's a workhorse designed to be all done by 4500 RPM.
>Unless you change cam/lifters/valve springs and pistons (Stock pistons are
>very weak) you're limited to where your at now with RPM range, but HP &
>torque can be bumped tremendously in these ranges.
>Just don't be fooled into trying to think of this engine as a small block
>chevy and try the same patterns of things that make the SBC run harder...
>they don't work.  For the SYty (And buick GN motors too) to make them run
>right there is a combination of things that make them run right... leave
>out one item of the combo and you either see no improvement or actually
>reduce performance.
>Later,
>Dave
>
>
>===========================================================
>           David Cooley N5XMT           Internet: N5XMT at bellsouth.net
>     Packet: N5XMT at KQ4LO.#INT.NC.USA.NA   T.A.P.R. Member #7068
>       I am Pentium of Borg...division is futile...you will be
approximated.
>===========================================================
>