hi im corey i was wondering if i could take a prom chip from a corvette and put it im my 87 camaro z28 irocz 5.7tpi

 

1987 Vette and Camaro for 5.7 TPI both used 7165 ECU. But I recall Vette is aluminum heads and Camaro is iron. Is that correct? If so the timing in Vette chip may be too aggressive. You may be able to retard at distributor to get it closer to Camaro? Also the trans in chip must match.

 

If the 7165 ECM's are anything like the 7730's, there's probably a parameter in the cal similar to "Spark Latency Time Correction vs RPM". IIRC, This parameter deals with the different diameter distributor caps. For a given engine rpm, the tangential velocity of the large cap HEI rotor is faster than the small cap rotor (due to the larger diameter). The spark timing takes this into account within the ECM. The ANHT (90-91 Corvette) and the AUJP (90-92 Camaros) have different values. Not sure the impacts of neglecting to adjust this.

 

ok so any sudgestions of cheap performince mods?

 

To the engine or to the calibration?

 

It should work fine if you have VATS in the Camaro. All vettes had VATS in 1987 but not all Camaro's. I used to swap my Vette and Camaro chips back and forth before I started tuning my own chips and I never had a problem.

 

its tpi so any

 

Well, if you're running 2.73 axle ratio out back, I'd change it to at least 3.42. IMO, you'll get more bang for the buck than anything you do to the engine (for equivalent $ spent).

 

im running stock

 

Ronny,

Why would you want to retard at the distributor? For the 7427 (all i've been studying on for a while) your suppose to (Courtsey of Fast):

Next it is time to setup the timing table. For a mildy cammed engine I typically setup the distributor at 6* advance and set the corresponding initial timing setting in the ECM at 6*. This allows for quicker starting with a cold engine but does not put excessive drag on the starter at other times. The initial timing on the distributor and in the PROM MUST match or it will mess with the whole timing advance curve.

Isn't retarding the timing @ the distributor lying to the computer essentially negating any reason to do the above regardlessly?

Just curious, as I know YOU know more than me!

- B

 

I assumed he was not into burning his own chips. My first chip was a hyper and it suggested advancing SA at dist a couple degrees, maybe three. So, I believe hyper chip only did the fueling. Ideally he purchases correct GM chip or get into tuning and pull correct one of off Moates site.