Electric Motor Mounted Like Supercharger -- Electric assisted engine

[Ecky]

The extra fuel it takes to get up a hill I typically save with a longer glide with the engine off on the other side, due to more momentum. Ultimately you only "lose" from slightly higher rolling resistance, and when you have to use friction braking and waste the larger momentum you've turned that gasoline into.

[cRiPpLe_rOoStEr]

Originally Posted by dipstick

It is the "getting up to speed" and "hills" where that added weight should show up and cause losses... and then there is still the cost factor isn't there?

Sure, but if you can convert that weight disadvantage into some sort of power assistence while driving uphill and decrease the brake usage while downhill it might justify.

[kach22i]

Audi's version of an electric turbo/supercharger

Electric Turbo - Pelican Parts Technical BBS

........bypassed under most operating conditions...........

The energy required to drive the electric compressor is derived largely from recuperation under trialing throttle conditions, making it consumption neutral......

[Panther140]

Originally Posted by dipstick

It is the "getting up to speed" and "hills" where that added weight should show up and cause losses... and then there is still the cost factor isn't there?

Weight transfers into momentum, which isn't a major loss when that momentum is recoverable energy via regenerative braking.

[cRiPpLe_rOoStEr]

Found something that might inspire you at least.

Home | XLHybrids

http://www.xlhybrids.com/content/ass...11-0301-LR.pdf

[dwtaylorpdx]

FWIW ,, on another forum that specializes in the LS grandchildren engines from GM, the FIRST mod on the newer ones is to disable the Variable displacement system. Its been tagged with serious engine wear issues (Again... Remember Northstar?) The un-powered cylinders wear out rings too fast.. And have piston scuffing issues.. For about 800 bucks HPtuner would let you play all you wanted with how it runs..

[Ecky]

I wonder why that is? I would imagine those cylinders would still get lubricated, maybe they're just getting too cold?

[Panther140]

Originally Posted by dwtaylorpdx

FWIW ,, on another forum that specializes in the LS grandchildren engines from GM, the FIRST mod on the newer ones is to disable the Variable displacement system. Its been tagged with serious engine wear issues (Again... Remember Northstar?) The un-powered cylinders wear out rings too fast.. And have piston scuffing issues.. For about 800 bucks HPtuner would let you play all you wanted with how it runs..

For $800 I could just replace each of those pistons 3 or 4 times

The engine gets 20% better thermal efficiency when in V4 mode than it does in V8 mode doing the same amount of work.

[Panther140]

Originally Posted by Ecky

I wonder why that is? I would imagine those cylinders would still get lubricated, maybe they're just getting too cold?

Its one of those issues that only really exists in the forums. I don't know anybody who has actually had that issue. Many of my family and friends have chevy trucks and SUVs that have the 5.3L equipped with AFM.

My truck is at about 130k miles. I try to maximize my use of AFM. The compression and leakdown is the same between both cylinder banks last time I checked.

My dad has a 2012 silverado 1500 with the 5.3L engine and it has AFM. Neither of us have had a single problem with our trucks. My GF's dad has a 2016 silverado-- Also has AFM. Also has not had any problems.

I think these AFM horror stories get circulated because there are a couple melons out there that get all the attention. Then guys like dwtaylorpdx get on the forums and echo what they've read on other forums.

Or maybe certain driving habits bring on the issue more than others. My truck spends most of its time either damn near WOT, or cruising lightly because i'm trying to stay in V4 mode.