Felt obligated to report on the road trip up to Newark, de this past weekend I noticed engine load on the quad readout was down to 9-12% with wiretap turned on at 5% tps, versus 12-15% with wiretap off (set to come on at 45% tps). I was crusing on flat roads at sea level at 60mph much of the trip when I noticed this. It's the only variable I changed, and I did it on the fly whilst driving. Torque on tap is way up, I notice less smoke while accelerating up to speed from lights (unless I over-pedal), but it is a little more jolty if I let out of the gas too quickly. These findings could be related to my setup perhaps.

Edited September 8, 20186 yr by rogerash0
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If your running on CANBus tune I doubt the wire tap means much. But if you tune has the wiretap starting at zero boost then maybe.

Wiretap isn't considered by the ECM in the engine load calculation. That's why the load number was down. Also, the reported instant mpg number is just a 'best guess' when wiretap is on. I discovered this same thing last year. Crusing at 85 mph with wiretap on, screen was reporting 23+ mpg. I was thrilled until I almost ran out of fuel in Nowhere, Nebraska and discovered my hand calculated mileage was 15.  

Haha, ya good call there Treed. I haven't actually used the instant mpg at all, ever, but I must say that every time I hand calc my mileage (which isn't much bc my speedo is off by as much as 10mph at crusing) that my outcome lands right around 15mpg. Ofcourse I'm talking about hand calcing exact distances & fuel consumption based off google maps, since I know my speedo is bad. I've been looking at engine load % all along.

 

It does strike me as ironic that the truck seems to burn cleaner with wiretap on while crusing and accelerating; I don't know if that's a function of having semi-large injectors (see 220hp). Here's to wishing the vp44 was more stout.

 

At this point it makes me realize/feel like more fuel and more pump helps the compound turbos function properly, spool properly, and in fact create a cleaner burn. With 125hp injectors and 50hp injectors the truck only seemed to smoke more due to turbos coming online later.

Edited September 9, 20186 yr by rogerash0
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