Hour Rule

[LooseonExit]

Sad stock '98 Dakota 5.2 Magnum/5spd dyno numbers for your time.

[CobraJoe]

@looseonexit Looks like a good place to start modifying to me.

[LooseonExit]

@cobrajoe

That torque curve (plateau) is nice, but pretty wheezy over 4k. I really liked the Dodge Magnum motors as they took to mods well. Of course I never modified this one and never dyno'd the one I modified (my '93). Priorities or something...

[winterlegacy]

I miss my mother's V6 Dakota. It was in the family for a decade, and then the engine spun a bearing while in the hands of an irresponsible driver (which thankfully was not me.)

[orneryduck]

@looseonexit that is impressively-lean, I'd love to know what the ignition timing is during the run. I'm guessing conservative timing to get away with the lean-burn at 4k. Usually as VE tapers off (as RPM goes up for most American V8's), you can run leaner -- this is tuned to the inverse. 12.5AFR would be a good starting point from 2k RPM to push timing to MBT then fine-tune from there.

[LooseonExit]

@orneryduck

It's crazy lean and the factory programming tune. And low mileage ~25-30k mi on it, so mechanically was fine. Just crazy unless the dyno O2 sensor is fritzing. They didn't seem surprised though(?).

My totally stock '98 Camaro LS1 (121k mi) dyno for comparison which is much more normal AFR.

[orneryduck]

@looseonexit cats don't do much at WOT so your AFR will still be pretty spot-on off a tailpipe wideband sensor, maybe .25/.5 off, but close enough to consider accurate.

Most Japanese cars have been wideband for 20 years, Ford went wideband with the Coyote/Ecoboost cars, but GM.... they still run narrowbands as stock, at lest in the LT1 cars, maybe the new Corvette finally discovered the magnificence of factory-installed wideband o2's.