Last post for this but I was reffering to the stock 88
injection setup would not handle over 350 hp without
any modifications. If it where modified it should but
not with the stock injectors, throttle body, etc. I
should have been more specific.
--- Jon <stkcode@yahoo.com> wrote:
> 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
> http://www.laserproplus.com
> http://www.computerpowersolutions.com
> Yahoo! Games - play chess, backgammon, pool and more
> http://games.yahoo.com/
>
=====
Jon
1953 3100 Deluxe Cab (Project)
http://home.pacbell.net/tbzone/index.htm
http://www.laserproplus.com
http://www.computerpowersolutions.com
Yahoo! Games - play chess, backgammon, pool and more
http://games.yahoo.com/
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
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