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Forum: General Efficiency Discussion

06-12-2018, 02:35 PM

Replies: 163

Is America ready for 4-cylinder full-size pickup trucks? Because they're here (GM)

Views: 19,013

Posted By joemac

Even non-hybrid Camry's now use cooled EGR. The...

Even non-hybrid Camry's now use cooled EGR. The base 2.5L in the 2018 Camry has cooled EGR. 2.0L in the 2019 Corolla has it, too. Also, the Mazda CX-9 SKYACTIV-G Turbo has cooled EGR. Chrysler...

Forum: General Efficiency Discussion

06-12-2018, 02:32 PM

Replies: 163

Is America ready for 4-cylinder full-size pickup trucks? Because they're here (GM)

Views: 19,013

Posted By joemac

That's becoming more common in boosted gasoline...

That's becoming more common in boosted gasoline engines. Also, the exhaust manifold is integral to the head and has a coolant passage. Not sure if GM is doing this, but in some cases the coolant...

Forum: EcoModding Central

01-23-2018, 04:16 PM

Replies: 9

Any Petrol Chemist on here?

Views: 1,376

Posted By joemac

U.S. pumps report octane as AKI, which is...

U.S. pumps report octane as AKI, which is (RON+MON)/2. Light naphtha has an AKI of 71, while heavy has AKI of 62. RON and MON are close for both naphthas (i.e., low sensitivity). For diesels, I...

Forum: EcoModding Central

11-01-2017, 11:59 AM

Replies: 432

"MPGiata" modding thread: aiming for 50 MPG with a 1990 Miata. Update: success, 55 MPG!

Views: 81,720

Posted By joemac

That depends on the emissions test. My guess is...

That depends on the emissions test. My guess is that we aren't talking about $5000 per day FTP75 testing on an electric dyno. IM240 testing on an inertia dyno is like a go/no-go gage when it comes...

Forum: EcoModding Central

10-24-2017, 05:28 PM

Replies: 37

Mazda Sky Active X! (HCCI gas engine: compression & spark ignition)

Views: 6,362

Posted By joemac

EPA 5-cycle testing goes all the way up to 85 mph...

EPA 5-cycle testing goes all the way up to 85 mph (US06 cycle). The 5-cycle test is used for the window sticker. The 2-cycle test (FTP75+HwFET) is used for GHG and CAFE compliance and the highest...

Forum: Hybrids

07-24-2017, 01:01 PM

Replies: 107

Unit-02 Red Honda Insight

Views: 19,810

Posted By joemac

Ideally, you want to test in both directions on a...

Ideally, you want to test in both directions on a flat road and coast down from a high speed. Auto manufacturers do their track coast downs from 80 mph, but 60 to 20 mph should be fine. I'm not...

Forum: EcoModding Central

07-24-2017, 12:33 PM

Replies: 60

SuperGeek Pictures, what do you all think?

Views: 19,920

Posted By joemac

I'm not that familiar with the 250 Ninja. Is...

I'm not that familiar with the 250 Ninja. Is that EFI or carbureted? MPG in the 70's might be due in part to enrichment. I think one of the later Megasquirt incarnations or something similar...

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