Renix ECU Question

[tdtony]

I was at a junk yard yesterday and pulled 2 ECU's.

 

I've read about the 428 ECU's and their better performance so I pulled one.  I've read that about the 428 ECU's but its always mentioned that its from either an '89 or '90, but the Vin on the Cherokee was '88 and I believe that it has a manufacturing date is '88 based on the 8844 tag on it. Will I get the increase in horsepower and torque out of this ECU, or is it no better then my '87?

 

I also pulled an ECU ending in 078 out of a '90 Cherokee. based on the 9008 tag I assume it was made in '90. I've seen some mentions of the 078 ECU's on the forum, but I can't find consensus if they are similar to the 428 ECU's or not.

 

Thanks,

TDTony

[schardein]

I'm not a Renix expert, but my understanding is the 428 ECU gives a performance boost and was specific for 89 & 90.  My first thought would be that ECU was swapped into the 88.  But if the "8844" date means (year/week of the year) (like tires are dated), then it would be late Oct/early Nov production, and maybe that's when the 428 was introduced? Either way, good find.

[cruiser54]

Use the 428. 

[tdtony]

Alright, thanks cruiser!