There’s no chance a full size Torque converter auto tranny equipped truck loses only 15% through drivetrain. No way- that’s similar for a manual tranny equipped vette w/ a short ass torque tube/drive shaft.
I’ve had a lot of experience getting both auto & manual tranny vehicles dyno’d- before & after mods, bone stock, back to back w/ other similar vehicles as a barometer etc. G8 GT, Camaro SS, GTO, Z06 vette, ‘07 Silverado 5.3, Merc Marauder w/ a stall & termi blower (friends car)etc etc.
No way, no chance, no how will a truck retain 85% of its crank HP en route to the rear wheels.
Rule of thumb would be closer to 25%- I’ll believe w/ the tighter modern 10 speed in these trucks there could be some efficiency gained there, but you also realize the big heavy wheels/tires will negatively impact the Raptors dyno #s too right? I’ve seen drag guys showing 10+ hp difference going down 10 lbs per corner.
Then there’s the 4.10s which ALSO will add to drivetrain loss & lower dyno readings.
So besides having a TC auto & a long driveshaft/wheelbase + heavier moving drivetrain components in general that cause ALL trucks to dyno lower than a car running the same engine, the raptors also have the tires & gears working against them on the dyno.
The dyno #s for the other vehicles tested in that article all seem reasonable - & that’s especially why I’m so impressed/dumbfounded by these results.
For comparison on K2 gen GM trucks (14-19) w/ a 6.2 like I had previously the typical stock dyno readings (usually on a dynojet) were 320-340whp against 420bhp - so 20-25%, super common. See attached.
Either they screwed up on the TQ numbers - or maybe these trucks really are well underrated from the factory. Clearly, the HP must be, & regardless - there’s no debate the best cheapest “first mod” for performance on these gen 2 raptors is filling em up w/ 36 gallons of 93+ for a solid 20whp bump.
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