The "tunnel" was support to be "tuned"...typo. Sorry,
I've had a long day and I misread Mike's original
post. I somehow missed the part with the 88 Firebird
TPI...sorry about that...my mistake.
Bill, I disagree about the production intakes handling
a lot of horsepower. I had a diagram (I'll try to
find it) that stated that those intakes where not to
exceed somewhere around 350 - 375 horsepower. They
where never designed to take that. It makes sense
to...since production vehicles (especially the newer
ones) are designed just enough to get the job done.
Most are not like the old days where thing where
typically over designed.
The 88 firebird was around 230 - 245 horepower on the
larger 5.7L V8 with 330 - 345 torque (numbers may not
be exact but should be close). The HP and torque
didn't jump big until the LT4 engine in 1996 on the
Corvette at 330 HP and 340 lb ft torque but that was
Sequential Port Injection not TPI.
This link talks all about this:
http://www.jimsperformance.com/portinj.html
TPI and MPFI are not the same..the concept is tha
same, but the flow design is different.
--- Bill Broadway <bcubed@vanhalen-irc.com> wrote:
> Well Jon, if you read Mike's post he said he already
> has an engine with
> TPI (which actually stands for Tuned Port Injection,
> which *is* a multi
> port injection as it has an injector for each
> cylinder). Not sure where
> you get that they won't handle much horsepower, as
> they originally came
> on very high performance cars such as the IROC
> Camaro.
>
> Mike I say go for it! Sounds like you have what you
> need, the wiring
> harness from painless is under $300. Lots of people
> run these systems
> and are completely happy, and it sure beats buying
> an aftermarket system
> in the $2,000-5,000 range.
>
> Bill
>
> > I'm going to be putting one on my 350 which is
> going
> > to be stroked to a 383 but not quite yet.
> Actually,
> > I'm going with MPFI (MultiPort Fuel Injection) for
> > best performance. I think you should go with TBI
> > (Throttle Body Injection) and not TPI (Tunnel Port
> > Injection). TPI will be more expensive but will
> get
> > better performance. However...this would require
> the
> > entire intake to be replaced...along with the
> > distributor and possibly even the cam depending on
> > your setup.
> >
> > With TBI, all that you should need is the throttle
> > body...which is really just a carb with two fuel
> > injectors on it, the computer to control it, and
> an
> > electric fuel pump with regulator. Also, with
> TBI, I
> > u just need the minimal amount of sensors (which
> their
> > would be 3 of them). You only need 3 sensors to
> run
> > fuel injection but all 7 would be best. Better
> fuel
> > injection systems like MPFI, have a MAP computer
> with
> > 7 sensors. You also might need to replace or add
> a
> > section on your exhaust manifold or headers for
> the O2
> > sensor.
> >
> > Both TPI and TBI cannot handle a lot of horse
> power
> > and torque. If your 350 is over 350 horsepower, I
> > suggest not going with either one if you get them
> off
> > a production vehicle (i.e. late 80's Camaro). I'm
> > looking at running 450 + HP and around 600 pounds
> of
> > torque. Thats why I'm going to MPFI, which can
> handle
> > up to 500 HP for small blocks.
> >
> > Sorry to say but it probably wont be that cheap.
> If
> > you get an existing setup off another vehicle
> you'll
> > still probably have to reprogram the computer for
> your
> > engine setup. Running an already carb
> engine...I'd
> > say stay with the carb until you decide to rebuild
> it.
> > They maybe jump to the injection setup so that
> > everything works right together. It will probably
> > save you a lot of time and agravation.
> >
> > Just my 2 cents...
> >
> > --- laurie <lauriecorbett@ns.sympatico.ca> wrote:
> > > has anyone put tuned port on there old trucks?
> > > i have a 55 second and i have a tpi system from
> a 88
> > > firebird
> > > it has a 350 with a 400 tranny i need to buy a
> carb
> > > anyway so i thought this
> > > would be just as cheep and look different too
> > > any ideas on wiring?
> > > or any other helpful info or pros/cons
> > > thanks
> > > mike
> oletrucks is devoted to Chevy and GM trucks built
> between 1941 and 1959
=====
Jon
1953 3100 Deluxe Cab (Project)
http://home.pacbell.net/tbzone/index.htm
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