Two TBI units, one ECM

[CSH-HQ]

Thanks, didn't realize it was 2/.5 P+Hs.

Are all the GM TPI P+Hs 2/.5, hmm are there others then the sunbird?.
WOuld the other TPIs be 2/.5?.
How would one tell a 2/.5 from a 4/1???
TIA
Grumpy


>Ummmm..............the "749"  houses two 4/1 Amp peak&hold injector current
>drivers, which were originally intended to drive two individual parallel
>sets of 2/.5 Amp peak&hold Rochester port injectors.  This particular box
>was expected to drive the the two pairs of injectors in either SSSF or SSDF
>port fuel mode.  Both electrically, and programatically, this is entirely
>different than what is required for dual channel TBI control, especially if
>you want to run "twin" TBI's.
>
>For "twin" TBI's, your best bet is to procure a TBI box, and add an external
>2-input to 4-output 4/1 Amp peak&hold injector driver box.  All of the other
>electrical and programatic options are serious compromises, no matter the
>cost savings.  Remember, each TBI injector expects to see 4/1 Amps for
>proper operation and control.
>
>
>Walt.
>
>
>
>
>
>>That might work, but I haven't tried it,
>>would also take building a calibration from scratch if it did.
>>Maybe copy something like AUJP into the values for the 749 but geez, that
>>seems like a lot of work..
>>Again it's one of those things that "might" work, but I don't know anyone
>>that's tried it
>>(Sounds like another job for Doc+Sneezy)
>>Grumpy
>>
>>
>>>If that is a problem, you could just set the MAP
>>>selection bit to one bar and use one bar MAP. (?)
>>>Mike V
>>>
>>>> Driver wise it could,
>>>>  But, it uses a 2 bar MAP so you lose resolution.  On high HP N/A I
>wouldn't
>>>>  even try.
>>>>  Could use 730 code as I have mentioned before.  But have to watch the
>>>gotcha'
>>>> s
>>>>  Injector firing differences pop up again.  I've run 730 code in a 749
>at
>>>>  about 300HP, but 400 is a big step.
>>>>  Some one with alot of talent, and software experience on thing, new
>guy,
>>>>  kinda a strech.
>>>>  Grumpy
>>>>
>>>>  >I wanted to expand on this the other night,
>>>>  >but didn't have time...
>>>>  >Why can't the 7749 run two 454 (two barrel) TBI units?
>>>>  >As used in the Turbo Sunbird, it has two drivers that
>>>>  >fire two P&H injectors each...
>>>>  >Inquiring CSH wearers wanna know
>>>>  >Mike V
>>>
>