More TPI questions

[Jeffrey R Muehl]

I'm working with an 85' Corvette TPI.
I'm still looking for the "magic" hardware answer.
Can a stock 85' Corvette TPI be retrofitted with the 86'-89' ECM?
In other words, did GM change the TPI unit in any way
(besides the ECM and wiring harness) between 85' and '86.

Thanks in advance,
Jeff



>Anything I have to say is from my experience with the Corvette
>engines.  Much of it relates to all of the pre '90 TPIs;  but, you
correctly stated that some may be irrelevant to the >Camaro/Firebird.


>Many of the tuners don't really recognize the existence of the '85.
> The major difference is the use of a different ECU and harness and
>the addition of VATS with the '86 model year (from the '86-89).
 There
>are other changes; but, these one significant in that the ALDL data
>rate is 160 bpS rather than the 8192 of the later ECUs.  This may
>sound insignificant until you try to take real-time readings of the
>engine parameters for performance mapping >purposes.
>

>Sorry to jump in late with questions...  I've been following this
>thread of
>85 vs 86-89, and I was wondering if you guys are talking about a
>.particular
>motor or GM v8s in general.  I think the vette was the only car that
>had
>VATS that long ago, so are you talking about the vette motor (L98)
specifically?  TPI motors in general?  TBI motors >also?
>
>
>Many of the aftermarket people don't even treat the '85 as a TPI in
>their discussions.  To start with, it uses a computer (ECU) unique to
>the model year.  Trying to get information on that particular
>computer/assembly are largely fruitless.  From what I understand (and
>I am not certain that I understand everything I know about the
>subject), you start with a different ECU, no pre-cats, VATS added in
>'86, and different ALDL data rate.  There may (probably are) more
>changes;  but, this is all I have heard about.

>