[Gmecm] TBI conversion

[Jared Ryan]

A Chevy V-8 has two coolant sensors.  There is one on the intake manifold, 
in or near the thermostat housing.  That is for the ECM.  There is another 
one in the driver-side cylinder head.  That is for the gauge in the 
dashboard.  They are totally separate.

On Thu, 30 Nov 2006, Steve Ravet wrote:

>
>
>> -----Original Message-----
>> From: gmecm-bounces at diy-efi.org
>> [mailto:gmecm-bounces at diy-efi.org] On Behalf Of Rick McLeod
>> Sent: Thursday, November 30, 2006 10:59 AM
>> To: gmecm at diy-efi.org
>> Subject: Re: [Gmecm] TBI conversion
>
> www.jagsthatrun.com has a lot of EFI conversion parts like VSS, also
> various mechanical bits, and plumbing elbows and straights for MAF
> sensors.
>
>>
>>
>> Currently uses a 1226865, target using a 1227747/1228747 ECM
>> (very common unit) Painless Harness 60101 (they engineered
>> wiring based on a 90 Chevy P/U for the 1227747 as well as
>> other similar ECMs) Holley TBI adapter 17-41 or (Painless
>> 60118) (solves the bolt pattern match issue) Painless VSS
>> Adapter 60115 (gets 2PPM from mechanical speedo cable), car
>> may have an acceptable feed already since CCC may require one
>> ThrottleBody from same size engine or modify cal on PROM to
>> change inj size PROM from same size engine (I can modify to suit)
>> Sensors/inputs: Knock, TPS, Temp, MAP, Spark, Speed
>>    I would intend to make a plate to mount fuses, relays,
>> MAP, etc onto to make installation clean
>>    * Knock sensor exists
>>    * TPS should be part of the TBI
>>    * Coolant sensor (this is still an outstanding question,
>> will the existing one suffice - I think so, if not acquire
>> correct one)
>
> The computer and dash cannot share a sensor, so you'll probably need
> two.
>
>>    * MAP sensor (this is still an outstanding question, will
>> probabally have to acquire correct one) My sources show a
>> valid 90 TBI 305 P/U part # as  OEM to be 16137939 but the
>> parts houses show it to be 16137039, so am a little puzzled here
>
> MAFs for TBI and TPI normally aspirated are all the same, although they
> come in different packages.  Any one of them would work for you.
>
> Get the factory service manual that corresponds to the donor ECM and its
> calibration.
>
> --steve
>
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