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View Poll Results: Will a 87 350 TPI comp. work in my 86 trans am? Will a 86 corvete 350tpi comp work?
Corvete computer will work. 1 33.33%
87 Trans am computer will work. 2 66.67%
Neither...... 0 0%
Voters: 3. You may not vote on this poll

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Old 05-01-2005, 02:10 PM
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305tpi-350tpi Conversion computer??HELP???

I own a 1986 trans am 305 tpi. I am in the process of installing a 350tpi in it. The problem i am coming across is that everyone i have asked doesn't seem know the answer to:what prom or computer do i use? Will a 1987 350tpi computer work in my 86 trans am? Pontiac didn't produce 350tpi in the trans am's til 1987. I am also curious if a 1986 corvete 350 tpi computer could possibly work? I know i am not the first or last person to do this coversion. If anyone could help me out I would be forever grateful. Thanks for the help. The engine in the car is a blown 305 with a connecting rod through my oil pan. The new engine is a remanufactured 350 with my tpi components installed on it linked up to a stock 4sp automatic transmission(for now). So no I do not have the factory computer, however I can get one for $75 out of a 87 trans am 350tpi for 75, or just the prom for $25 from www.tacreationsusa.com thanks for everyones responses and help.


Last edited by dahornic; 05-03-2005 at 06:11 PM.
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Old 05-01-2005, 02:18 PM
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When I went to a 350 from a 305 carbed motor I called these guys
http://www.sdpc2000.com/ and they sold me the right chip and
gave me the info on what ECMs I could use. I got the ECM from a salvage yard http://www.gmsports.com/.
BTW why a poll
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Old 05-01-2005, 04:03 PM
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Doc here,

I'm a bit confused on what computers you have for what engines,

However, The BEST way is to marry the 350 Engine, Computer and harness into the project vehicle as a unit..

The Engine and computer are designed to run together, and then you would only have to isolate power and grounds from the car to make it play, No prom update would be required (unless your going for a performance chip...)

I'm pretty sure the Corvette Computer won't work without extensive modification, since that computer had other signal sources external to the engine, such as BCM (body control module) and I think 84 and up were VATS So I would take a pass on that one...

Get a Manual For your Body, and One from the Donor Car, sit down and draw a schematic for any differences between the new harness and your body at the computer's,
.....Stock body..............New Engine harness
Pin #........Color wire......Pin #.......Color wire

.....A...........Pink............A.............Bro wn
.....B...........Blue............B.............yel low
.....C...........orange........C..............blac k

And so on...Use that to graft the harness into the car..you should come out alright.

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Old 05-03-2005, 08:28 AM
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I'm with Doc on the confusion. Please clarify three things -
1. Is the 350 TPI engine stock and from what make, model and year?
2. What type of transmission is in the 1986 Trans Am that will receive the 350?
3. Do you have access to the computer that the 350 came from?

If the 350 is from an 86'-89' MAF car, you do not need to change the computer or harness in your 1986 Trans Am since you are swapping a MAF TPI system, regardless of engine size; and whether or not it was a Firebird/Trans Am, Camaro or Corvette.

All 86'-89' are MAF and since they all use the #1227165 ECM and are TPI, there is no need to change the harness. You can use your 86' computer, but you need to install the MEMCAL from a vehicle that supported that 350 and was MAF. 86'-89' F-body and Corvettes use a service #1227165 ECM (computer), but the mask and binary files will be different, depending upon the year and engine/transmission combination.

The MEMCAL is the blue "chip" that can be popped out and simply reinstalled.

Give us some more information as requested above. Ed
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