Smpi ?

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jaxerson

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Might purchase this 15 Laramie limited, and the window sticker says 5.7 hemi MDS VVT. The vin check and print out shows 5.7 v8 SMPI. ? What the hell is this and is it the same thing
 

Kotta390

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Sequential Multi-Port Injection
 
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jaxerson

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So is it not correct? It's not MDS VVT, which is what I want. Or are they all SMPI also
 

TRCM

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They are all both

SMPI refers to the firing order & location of the injectors

MDS refers to the dropping of 4 cylinders for economy

VVT refers to the variable valve timing which gives the effect of a larger cam @ higher RPM

and every Hemi these days has all 3 features
 

TRCM

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They are all both

SMPI refers to the firing order & location of the injectors

MDS refers to the dropping of 4 cylinders for economy

VVT refers to the variable valve timing which gives the effect of a larger cam @ higher RPM

and every Hemi these days has all 3 features

Well, every 5.7 hemi these days...........I think the bigger hemis (6.1 & 6.4) have the SMPI & VVT but not the MDS, and the 6.2 in the hellcat, well, it's just bad to the bone.......................
 

MADDOG

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Well, every 5.7 hemi these days...........I think the bigger hemis (6.1 & 6.4) have the SMPI & VVT but not the MDS, and the 6.2 in the hellcat, well, it's just bad to the bone.......................

5.7L in the HD's and third gen MegaCabs didn't have MDS but the 1500's did.

6.1L car engines don't have MDS and I am glad of that.

Truck and car 6.4L engines have MDS.
 

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