dieseldennis

I have a 87 Z28 with a 350 TPI motor. The stock motor was a 305 TPI. How can I tell if the chip swap has been done? Is it a big deal to have the 350 chip? will my engine blow or something?

Thanks all
Dennis

RBob

iTrader: (1)

Open the ECM cover (small plate with 2 screws) and get the 4 letter code from the MEMCAL (see sticky for pic ^^^). This code is known as the BCC. That code will allow us to find out which engine the chip is for.

Post is back here.

RBob.

dieseldennis

my BCC is "ABUN"

RBob

iTrader: (1)

Doesn't look like the chip has been changed:

87 5.0-F A/Trans(MD8) Fed, 2.73(GU2) 16068515 8517ABUN

Here is a link to additional MEMCALS and part numbers:

https://www.thirdgen.org/newdesign/faq/thirdgen.shtml

Typically the correct calibration will run better. If you do decide to change it please let us know if it is better or not.

RBob.

dieseldennis

Thanks RBob,
With the info you have supplied I guess I have 2.73 rear end. I couldnt find a stock chip on that list that took that ratio into account. Would you suggest I get one programmed to match my vehicle? Or could I safely use one on that list?
I am sure its obvious that I am a newbie to Camaro's and such. I hope this next question is a valid one; Can I get the chip I have now reprogrammed instead of buying a new one?

Thanks
Dennis

RBob

iTrader: (1)

It is possible to reprogram the current chip. The only problem would be getting an unadulterated stock bin.

One thing to consider is how the engine runs now. if it runs decent and there aren't any issues, it may be best to just stay with what is in there. If you are planning on modifing the engine then getting into doing the chips yourslef is a good thing.

The other thing, which may be more important then a chip, is to check that the proper injectors are installed. The 350 engine used a larger injector then the 305's.

Here are the numbers that may be found on the injectors body itself for the 5.7L engines (350's):

5235211, 5235302, 17086544 and 17086545.

It is also possible that aftermarket injectors such as Accel or SVO's have been installed. The '87 & '88 305 TPI used this injector: 5235301. If that one is found then getting the proper injectors would be advisable.

RBob.

dieseldennis

My Injector numbers are 5235047 Also I have one lone injector with the number d1570ba I dont know who makes it but it is definetly different. Any Ideas?

Thanks
Dennis

RBob

iTrader: (1)

Hmm, here is the info I have on those injectors:

"The part number for the 1985 and 1986 5.0 TPI's was 5235047."

Most likely this info came from TGO and for additional info may be found with a search.

Have you been able to verify that the current engine is a 350? Can check the driver side rear of engine on top portion of the bellhousing mounting flange. Will have either a large cast in 5.0L or 5.7L.

RBob.

dieseldennis

Yes the stamping says 5.7. I have a new engine (also a 5.7) going at this very moment. It is also a 5.7. I bought this car used a few days ago and then I blew a rod. And now I think I know why. Alot of mismatched parts!!!

Here is a off topic question.....When removing the blown engine I see that the flex plate has a counterweight on it. Is this right?

AAAARGH!! Somethimes these things can be very frustrating eh?!

Thanks
Dennis

RBob

iTrader: (1)

Yes, I am all too familar with 'frustrating' when is cames to cars.

As for the counterweight, it is possible, IIRC the one-piece rear main seal 350's ran a small counter weight. Although you may want to do a search or post on the general tech board on this.

Shame about blowing the engine. Off hand I would say that proper injectors and a new MEMCAL just may be in order.

If the engine going in is modified (heads, cam, etc), you may what to consider getting into programming your own chips. You can then go with newer code too. The '89 f-bodys ran the $6E code which is better then the early $32B code (maskid).

If thinking of this route this link can be helpful in getting started:

https://www.thirdgen.org/newdesign/tech/promintro.shtml

RBob.

dieseldennis

The new engine came out of a 87 IROC Z and was the stock high output 350. I just found out that the old motor was filled with regular 350 parts (cams, lifters, etc...) At least now I am sure what I have.
I will definetly get into the programming side of things I think, we'll see.

Thanks
Dennis

dieseldennis

There is alot of tech lingo that makes doing my own programming a little scary. Is it as hard as it may seem, or is it something that, with a little patience a regular "joe" can get the hang of?
I am the type of guy that takes risks (sometimes to my own peril though ) so Ill try it, but Id like a little reassurance that I can do this before buying the equipment.

:rockon:
Dennis