Thanks and a bit abotu me. Was:Re: [Diy_efi] TBI or TPI?
Ashley Evans
hoshy
Wed Sep 14 16:05:26 UTC 2005
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 <hoshy at hoshy.co.uk> 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" <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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