Driving my brother's tuned 3.5 twin turbo F-150 makes me jealous.That engine is a TJ would be dangerous. The throttle response from a dead stop is amazing even with 35s.
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Currently my main vehicle is a 3.5 ecoboost, I’ve owned newer GM 5.3, 6.2, Ford 2.7 and 3.5 in the last 5 or so years. Seat of the pants the 3.5 feels slower/less responsive than the 2.7 ecoboost. Cool thing is the 2.7 is cheaper lol. Try power braking off the line for really impressive throttle response
6.2 off the line with the 10 speed is amazing but I’d prefer towing with an ecoboost. Hated the 5.3 with the 6 speed (don’t kill me LS guys haha)
Edit: I missed the part about your brothers being tuned. Never messed with running an ecoboost so no experience
