I was just thinking about somthing......I used to have a 305 but now I have a stroker

Is the ESC (on the driverside firewall by the relays) the same for a 305 and a 350?
Should I change mine? Im sitll running the 305 module., would that cause some kind of problem with the spark? timing? anything?

 

hmm? anyone know? have I stumped you guys?

 

If its working, dont fix it.

 

You will need to switch the Knock Sensor and the ESC module. They are 2 different part numbers from the 305 to 350 and need to sync together to operate properly. My car acted a bit weird until I changed them

Good Luck!

 

ive got a 305 knock sensor and ESC module. I was told or read somewhere that I needed to 305 KS cause of something about the volts or ohms some crap like that ....that the ECM reads...

does that make some kind of problem seeing that im a 385 now?

 

When I converted from carbeuration to fuel injection, I used a 1991 ESC module and a 1991 350 knock sensor for my Minirammed 385. If you are using your original EFI sysem, and stick with your original ESC module, you probably should stick to the 305 knock sensor. The ESC module is essentially a "go-no/go" gage that filters the signal from the knock sensor. That sensor is in essence a microphone with a tuned frequency response, and the ESC module filters the signal to look for a specific frequency of vibration that is characteristic of detonation. When detonation is sensed, the ESC module outputs a TTL level HIGH (5 volt) signal to the ECM, and the fuel injection computer backs off the timing in response to eliminate the detonation.

Will you have trouble, Wishmaster? I'm not honestly sure. The 305, having a smaller bore than a 350 or 385, might have a different frequency content from the "ping"of detonation, since the flame front doesn't have as far to travel before it hits a wall or ring land. Therefore, I think it's theoretically possible that the 305 detonation could sound different than detonation in a 385/350. If you are at all unsure, do what I did and upgrade. You can buy a new knock sensor rather cheaply, and you can probably get the appropriate ESC module from Hawks third-gen, or one of the other F-body boneyards. It's a drop-in solution and easy to swap out.

 

ok I did some searching my old posts. I have an 87 350 KS in my build. So should I be using an 87 350 ESC with the setup? to make everything work together?

 

Yes,

The ESC & Knock Sensor need to be compatible with the engine size.

Good Luck!

 

well damn!....i guess I need to get me a 350 ESC..

hey, how was your acting weird? what did you notice when you changed them?

 

It had a bit of rattle under hard acceleration for the longest time, but ever since I changed both parts it has gone away and the motor feels a bit stronger.

 

I bit of a rattle? hmmm? I dont see how that could be the ESC. but yeah I guess I'll have to find the money and change it. One thing I noticed when data logging I would watch the spark advance@TDC and the spark would sometimes jump to 47* or more. That why im wondering if it could be the ESC. I dont get any knocks though.

 

The job of ESC is to detect preignition, then tell the ECM to retard timing to make it go away. The ESC is not what causes timing to advance or retard. It's only there to raise a red flag when it detects knock. The ECM does all timing control functions. However, If you have no ESC signal, there will be no timing retard when preignition occurs.