[Diy_efi] TBI or TPI?

[Ashley Evans]

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" <dunvegan at sbcglobal.net> 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 <hoshy at hoshy.co.uk> 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" <dunvegan at sbcglobal.net>
>> 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
>> >great way to go. It is frequently dubbed a
>> tow-truck
>> >motor. There are a couple ways to even leverage it
>> >more but in stock form would be great. There are a
>> >couple aftermarket companies that have nice TPI
>> >packages, but with a little work salvage yard or
>> ebay
>> >should yield all the necessary parts and leave you
>> w/
>> >just wiring. The main issue is fuel lines, as
>> you'll
>> >need a return line and a high pressure pump which
>> are
>> >not requisite of a TBI, and I would suggest from
>> >experience to go w/ a Painless wiring harness
>> rather
>> >than fighting w/ a factory loom and making it work.
>> >You'll appreciate having spent the extra in
>> >elimination of frustrations and it being plug'n
>> play.
>> >
>> >Good luck
>> >
>> >
>> >
>> >--- Mike <sonoma at shaw.ca> wrote:
>> >
>> >> I was thinking of adding TBI or TPI fuel
>> injection
>> >> to my  83 Chev 350 (M) which is in a 11000 lb GVW
>> 1
>> >> ton chassis.
>> >>
>> >> Has anyone setup both types of fuel injection are
>> >> the costs for TPI a lot greater.
>> >>
>> >> What are the advantages and disadvantages of TBI
>> and
>> >> TPI
>> >>
>> >> I'm considering  going with FI because I'm hoping
>> to
>> >> get better fuel economy, better drivability, more
>> >> torque and horsepower if possible.
>> >>
>> >> I don't want to change the heads on the engine
>> just
>> >> the intake.
>> >>
>> >>
>> >> Any ideas or suggestions would be appreciated
>> >>
>> >> Thanks...>
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>> >>
>> >
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