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Posted by ranxerox
 - February 26, 2025, 10:03:56 AM

Hello,

Old-ish subject, but I must admit confusion.

Reading this post - https://www.vulcandrifterriders.com/forum/index.php?topic=56209.0 - I had my curiosity peaked.  I began doing research on ALL 1500 cylinder heads, cams for the above mentioned 1500 models. Turns out from 1999 to 2006 all the 1500 models have the identical cylinder head, camshaft, manifold, injector and throttle body part numbers.

So, I question how the ECM/ECU's for them are different?  I mean if the mechanicals, gear ratios, etc. are identical (except for the Meanie, as I understand it, they have closer ratio gearing), then how is the computers mapping different?

Also, I've modified the hell out of my Drifter and the ECU seems unaffected, I've also read people who've changed piston/cylinders, cams and so on and left the ECU relatively untouched.

If there's no difference in the mechanicals, gearing and so on, why does everyone say the ECU's are different?

Scratchin' my head over here...

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