Thanks and a bit abotu me. Was:Re: [Diy_efi] TBI or TPI?

Wed Sep 14 19:35:25 UTC 2005

Hey Rick, what did you say the name of that book by Lingenfelter was? I got delete happy before I finished reading. Thanks, Ski

Rick McLeod <dunvegan at sbcglobal.net> wrote:Now for me to learn, what is AFM?

BTW, from what I've experienced, forced induction
manages easier w/ MAF than MAP as MAP is a calculation
of air mas based on pressure and temp where MAF
measures true air flow. I have cars w/ turbos both
ways, and the more easily managed and more driveable
seems to be the MAF based, but there are definite
differences beyond that due to manufacturer, etc.
I know little about supers so don't know how different
that may be from turbos.

And, btw, I'm a uk'r at heart, well sort of, if you
consider you're northern neighbors in Scottland :-)
and a linux fan also, so would be interested in see
the results of your final project, hopefully you'll
hang around and post them upon completion. Good luck

--- Ashley Evans wrote:

> Ah, I see. Thanks for the info. I'll look up that
> book. I'm not 
> actually doing any conversion myself just interested
> in how it all works.
> 
> For anyone who's interested i'm running an '89 BMW
> 318i (m40 engine) 
> it's a simple 8v sohc 4pot not great at the bottom
> end but quite nice 
> above 4k.
> 
> I'm going to be installing a unichip piggyback
> management system to 
> allow me to map it properly and facilitate a move
> from AFM to either MAP 
> of MAF. The community I'm part of
> (www.e30zone.co.uk) rates the MAF 
> conversion quite highly but I'm going to be
> installing an eaton m45 
> (mini cooper S) supercharger so I may go down the
> MAP route from the 
> beginning.
> 
> I do computer science at uni and for my final
> project I'm hoping to 
> create my own fuel (maybe igniton) computer based on
> real time linux 
> (I'm a huge linux fan!) that's really the reason
> i'm here, and I just 
> enjoy reading the various discussions... and flames
> :)
> 
> Oh, I'm based in the London, UK btw.
> 
> Ashley.
> 
> Rick McLeod wrote:
> > The late John Lingenfelter was one of the most
> highly
> > respected SBC authorities, he wrote a book
> detailing
> > modifying the SBC in many fashions, TBI, TPI,
> RAM-Jet,
> > LT/S versions, etc, including bolstering oil
> systems,
> > fuel, etc. I recommend getting a copy or borrowing
> one
> > from the library if doing any SBC work, it saved
> me
> > many headaches building both my TPI's.
> >
> > BTW, TPI is Tuned Port Injection, a form of
> multi-port
> > injection using a long runner design that was
> > originally optimized to the 305, but adapted to
> the
> > 350 with good sucess. It falls apart at high RPM,
> mine
> > virtually quits at about 4500, but at 1000 rpm it
> will
> > put a moderate hill without downshifting, and
> cruises
> > at 75 to 80 at 30MPG at about 2400 RPM. This is
> torque
> > at it's finest!
> >
> > To make your choice, it depends on your needs, are
> you
> > going to drive it much, if not don't spend the
> > time/money on TPI, but you'll really like what it
> > brings if you go that route.
> >
> > BTW, I run a 700 trans w/ a 2400 stall converter,
> > really comes off the line hard and strong since it
> is
> > well on top of the torque curve at launch, but w/
> the
> > lockup converter it doesn't impact MPG (read claim
> > above).
> >
> > Hope this helps. 
> >
> > --- Ashley Evans wrote:
> >
> > 
> >> Thanks, I even fully understood your description.
> >>
> >> So what is TPI? is that direct injection?
> >>
> >> The discussion on low end torque being better on
> >> TPI, is that related to
> >> the manifold length?
> >>
> >> Does anybody have links to the equations and
> theory
> >> etc related to
> >> manifold design, volume, length etc. And info on
> >> the resonance flap
> >> used by some manufacturers?
> >>
> >> I'm sorry to hijack the thread with so many
> >> questions :-/ Feel free to
> >> ignore me.
> >>
> >> Regards,
> >> Ashley Evans
> >>
> >> On 14/9/2005, "Rick McLeod"
> 
> >> wrote:
> >>
> >> 
> >>> you're correct, TBI is Throttle Body Injection,
> >>> 
> >> which
> >> 
> >>> usually is the use of a carburetor body w/
> >>> 
> >> injectors
> >> 
> >>> to replace the atomization function under
> computer
> >>> control (other primitive means are used also).
> >>> Therefore, most all intake manifolds are
> relatively
> >>> easy to conver to TBI, and I believe companies
> such
> >>> 
> >> as
> >> 
> >>> Holly and Edelbrock and others make simple kits
> for
> >>> this.
> >>>
> >>> --- Ashley Evans wrote:
> >>>
> >>> 
> >>>> Sorry for the n00b. question. I mostly lurk
> >>>> 
> >> here
> >> 
> >>>> to read and learn.
> >>>>
> >>>> TBI and TPI mean what??
> >>>>
> >>>> I thought that TBI means Throttle Body
> Injection,
> >>>> 
> >> or
> >> 
> >>>> am I sorly mistaken?
> >>>>
> >>>> Regards,
> >>>> Ashley Evans
> >>>>
> >>>> On 14/9/2005, "Rick McLeod"
> >>>> 
> >> 
> >> 
> >>>> wrote:
> >>>>
> >>>> 
> >>>>> Clearly TBI would be an easy swap, replace the
> >>>>> 
> >>>> carby
> >>>> 
> >>>>> w/ a TBI unit, add some computer, wiring, and
> a
> >>>>> 
> >> few
> >> 
> >>>>> sensors and you're off and running.
> >>>>>
> >>>>> TPI is a much nicer solution, hence why GM
> went
> >>>>> 
> >> to
> >> 
> >>>> it.
> >>>> 
> >>>>> It's long runner design lends to very good low
> >>>>> 
> >> end
> >> 
> >>>>> torque, but in stock form has limited top end
> >>>>> 
> >> RPM
> >> 
> >>>> and
> >>>> 
> >>>>> HP drops off toward the top end. That
> shouldn't
> >>>>> 
> >> be
> >> 
> >>>> a
> >>>> 
> >>>>> factor in your application, actually TPI would
> >>>>> 
> >> be a
> >> 
> 
=== message truncated ===

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