Coasting

[CantThinkOfAHandle]

This review in The Car Connection

https://www.thecarconnection.com/overview/jeep_wrangler_2018

says that the turbo will shut off during coasting, and let the vehicle remain powered by the 48V battery. Does anyone know if this is true? This must explain some of the remarkable mileage gains that are reported for mild hybrids.

Sponsored

 

[Bearded_Dragon]

When you're coasting the engine doesn't need fuel as the wheels are turning the engine. Older cars added some fuel to the mix but systems like Displacement on Demand (DOD) have been around for a while where the computer cuts fuel to x amount of cylinders if the load isn't large enough.

 

[Nate]

Turbos can’t “turn off” in th classic sense, they just don’t create boost....so the engine is still on acting as a normally aspirated one. When they spin up the do so from exhaust gasses going through the turbine blades signaled from the diverted valve.... That is directly related to throttle position and ecu fuel mapping software.

That same mapping also signals regenerative systems for the mild hybrid but it’s my understanding it’s used on acceleration to supplement engine output in launching from a stop only.

 

[BillyHW]

This review in The Car Connection

https://www.thecarconnection.com/overview/jeep_wrangler_2018

says that the turbo will shut off during coasting, and let the vehicle remain powered by the 48V battery. Does anyone know if this is true? This must explain some of the remarkable mileage gains that are reported for mild hybrids.

I would call it minimal, barely noticeable mileage gains, probably not even enough to make back the initial costs and continuing maintenance costs and battery replacement costs of the BSG system.

 

[badtux]

I would call it minimal, barely noticeable mileage gains, probably not even enough to make back the initial costs and continuing maintenance costs and battery replacement costs of the BSG system.

That depends on the initial cost and maintenance requirements. If the speculation that the I4/BSG/Auto will cost less than the V6/Auto combination is true, initial cost won't be an issue. As far as "barely noticable" mileage gains, previous vehicles that have used this system have seen improvements of about 10%. Granted, given how lousy the Wrangler's fuel economy is, that's not much of a gain....

 

[CantThinkOfAHandle]

That depends on the initial cost and maintenance requirements. If the speculation that the I4/BSG/Auto will cost less than the V6/Auto combination is true, initial cost won't be an issue. As far as "barely noticable" mileage gains, previous vehicles that have used this system have seen improvements of about 10%. Granted, given how lousy the Wrangler's fuel economy is, that's not much of a gain....

I hope you're right about turbo pricing.

A 10% improvement actually provides more benefit for lousy mileage vehicles, because they use more gas. So it's 10% of a larger number:

 

[Cov]

I really hope the turbo isn't the least expensive option, cause I'm getting worse fuel economy than I ever did on a v6, because it's so freaking hard to stay out of boost when it starts to spool at 2k!

I KNOW I'm going to get better mileage on the 3.6 than I will on my ecoboost. I'm currently getting worse than the Wrangler's city EPA

 

[Dynomite1371]

I really hope the turbo isn't the least expensive option, because I'm getting worse fuel economy than I ever did on a v6, because it's so freaking hard to stay out of boost when it starts to spool at 2k!

I KNOW I'm going to get better mileage on the 3.6 than I will on my ecoboost. I'm currently getting worse than the Wrangler's city EPA

Calm yourself down! Lol

Sponsored