[Diy_efi] TPI Air Intake Temp Sensor Location

[Mike Frels]

In the bottom back of the Plenum is where GM located the IAT Sensor on TPI engines. I have seen many threads on different lists on the pros and cons of relocating the sensor to the airbox but nothing conclusive on benefits. The most recent discussions of the last few years have been about using later model non-tpi plastic bodied sensors that don't have the suffering of heat soak like the brass bodied ones in the original tpi setup. Sorry but I can't supply any part numbers for you. I bought one several years back to try but I have since misplaced it while sorting out problems with a 305/350 swap.

Being closet mopar freak from the 60s and 70s I am interested in what you have done also.

Mike



-----Original Message-----
>From: David Allen <davida1 at hiwaay.net>
>Sent: Sep 3, 2006 8:18 AM
>To: diy_efi at diy-efi.org
>Subject: Re: [Diy_efi] TPI Air Intake Temp Sensor Location
>
>  Clair, in the air filter base exactly where you describe is where the factory intended, on a TBI setup on a 305. The MPFI system from a 2.8 V6 it was also in the airbox, pushed into a rubber grommet.
>  As far as I know all the fuel-injected GM cars with an IAT sensor have this mounted on the air intake before the throttle.  Wouldn't the fact that the air in the manifold has gone through a pressure drop at the throttle, lead to a lower reading than the ECM is wanting?
>  How did you put a tuned port setup on a Mopar engine?  This has got to be interesting! Do you have pictures? Good luck firing this beast up!
>  Hope this helps!
>David
>
>----- Original Message ----- 
>From: "Clair Davis" <clair.davis at charter.net>
>To: "diy_efi" <diy_efi at diy-efi.org>
>Sent: Saturday, September 02, 2006 10:33 PM
>Subject: [Diy_efi] TPI Air Intake Temp Sensor Location
>
>
>> OK, I'm THIS >< CLOSE to firing up my 2-year EFI conversion on my 69
>> Plymouth Valiant.  I'm using a 7730 ECM, and I've got 99.44% of the wiring
>> done now, so probably over the next couple of days, I'll be asking some
>> seemingly goofy questions.
>> 
>> The first, I'll keep simple... does the air temp sensor care where it's
>> mounted?  Currently, I've got it mounted in the air cleaner assembly I'm
>> using, a reproduction of the old Mopar "unsilenced" air cleaner that you put
>> the engine callout plate on back in the day.  Basically, I drilled a hole in
>> the air cleaner base and mounted the sensor with a short piece of heater
>> hose.  It's a very tight fit, so the sensor is not about to come out of
>> place, and there won't be any unfiltered air leaks at this location.
>> However, I just "re-discovered" a hole in the back of my intake manifold
>> that might be the right size for the air temp sensor.
>> 
>> Is one of these locations superior to the other from a functionality
>> standpoint?  It's nothing to plug the hole in the intake, but it might
>> provide a tidier install and allow me to remove the air cleaner without
>> having to remember it's hard-wired to the car...
>> 
>> Any advice greatly appreciated,
>> 
>> Clair
>> FTWTX