I have a 91 4.3 S10, and an ECM from a 91 Camaro. I've looked at the full size 4.3 ECM's and the timing table only goes to 3600rpm, I'm confused as to what exactly happens after this point. Is it practical to swtich over to my Camaro's ecm and prom if I redo it, or should I just find an ecu to modify for this "91 - 92 4.3L S-10 & C/K Truck
$A0 16144288" I've already searched for an ecu and bin for my truck, and can't find the exact one, this is my first venture into attempting a cross program like this so any advice would be greatly appreciated. Thanks again everyone.

 

I used a 1227747 out of a 4.3L astro van. Plugged into the S-10 harness for my 1228062 with no re-pinning needed (I did check it, though). Above 3600, there's a ramp value where you set how much timing to add per 1000 rpm, and another value to set the max rpm for the ramp.

Teeleton

 

How do you go about setting and raising the ramp? I'm using Tuner Pro RT, is there a way to modify in this? I plan to pull my ECM and find out exactly what's in there tonight, thanks for the input Teelton

 

#2 & 3 in the constants.

Teeleton

 

Aah, Tuner Pro has more options for that ecm than the one I was working with. I'm most definetly going to attempt to swap over ECM's and burn a prom for the truck. I have 2 Camaro ECM's but neither of them is the 7747, one is a 1227783 and the other is a 1228746. I'm pretty sure either of these will accept my S10's factory memcal, the 8746 is a 91 ECM so hopefully this will swap directly in.