392's or long tubes?

crash68 · Jun 28, 2017

3.55 are available, it is standard gearing for the EcoDiesel.

MIKE-HKS · Jun 28, 2017

shane1981 said:
they do have 3.55 for the 9.25 zf

tuned by jay greene

nice to know , may look into them , 3:21's are to low for me to pull the boat , but 3:92's which is what i have now kill me on the fuel economy

West27 · Jun 28, 2017

MIKE-HKS said:
nice to know , may look into them , 3:21's are to low for me to pull the boat , but 3:92's which is what i have now kill me on the fuel economy

What are you getting for mpg? I have 3:92 and I get 16-18 in town and over 20 on the highway.

shane1981 · Jun 28, 2017

West27 said:
What are you getting for mpg? I have 3:92 and I get 16-18 in town and over 20 on the highway.

i get the same

tuned by jay greene

West27 · Jun 28, 2017

And you aren't happy with that? From past trucks and talking to others with Silverado 6.2 and F150, we are getting just as good or better than those trucks. You drive a truck man not a Prius.

bchap05 · Jun 28, 2017

MIKE-HKS said:
nice to know , may look into them , 3:21's are to low for me to pull the boat , but 3:92's which is what i have now kill me on the fuel economy

How big is your boat? My 3.21's pull my 19ft Four Winns perfectly fine including up hill

MIKE-HKS · Jun 28, 2017

West27 said:
What are you getting for mpg? I have 3:92 and I get 16-18 in town and over 20 on the highway.

i dont know how you guys are getting that
i was getting 8 in the city then i was getting 10
now i removed the tune and cold air intake and left the truck bone stock 12.5 average , 87 octane no sense in using anything better
now if i do a long trip strictly highway ill see 21 22mpg

shane1981 · Jun 28, 2017

MIKE-HKS said:
i dont know how you guys are getting that
i was getting 8 in the city then i was getting 10
now i removed the tune and cold air intake and left the truck bone stock 12.5 average , 87 octane no sense in using anything better
now if i do a long trip strictly highway ill see 21 22mpg

im getting it with full bolt on's and a jay greene 93 tune with mds off

tuned by jay greene

shane1981 · Jun 28, 2017

higher timing and more air going out makes any motor more efficient

tuned by jay greene

MIKE-HKS · Jun 28, 2017

bchap05 said:
How big is your boat? My 3.21's pull my 19ft Four Winns perfectly fine including up hill

24 footer center console , the problem with towing with 3:21 is the passing power and above 50mph , big difference between the 3:21 and 3:92 while towing 6500 pounds

West27 · Jun 28, 2017

MIKE-HKS said:
i dont know how you guys are getting that
i was getting 8 in the city then i was getting 10
now i removed the tune and cold air intake and left the truck bone stock 12.5 average , 87 octane no sense in using anything better
now if i do a long trip strictly highway ill see 21 22mpg

Here are my mods and that is hand calculated.

Robocop_9 · Jun 28, 2017

I see 18-19 in town now with bolt ons and 89 hemifever tune. I'm running 33x12.50 on some heavy xd rockstars.

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MIKE-HKS · Jun 28, 2017

i just fueled up to take a trip tomorrow
this past tank it averaged 10.75 mpg hand calculated computer said 11.70mpg
:suicide:

HammerHead · Jun 29, 2017

If I had the 8 speed I would go LT headers.

RLJ10X · Jun 30, 2017

I will tell you how to get good gas mileage......

Drive slow.

Thats it. No more complicated than that.

BadRam14 · Jun 30, 2017

HammerHead said:
If I had the 8 speed I would go LT headers.

That is what I have decided. Thank you for keeping your response to the topic. I have already received my JBA long tubes and Y-pipe. I will be installing them in the morning.

shane1981 · Jun 30, 2017

BadRam14 said:
That is what I have decided. Thank you for keeping your response to the topic. I have already received my JBA long tubes and Y-pipe. I will be installing them in the morning.

use oem style gaskets the gaskets provided are junk

tuned by jay greene

BadRam14 · Jun 30, 2017

Will do. Thanks guys

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Robocop_9 · Jun 30, 2017

shane1981 said:
use oem style gaskets the gaskets provided are junk

tuned by jay greene

Yes they are JUNK! Use the oem ones. I found out firsthand and trust me you don't want to install then headers twice back to back. Lol

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RLJ10X · Jun 30, 2017

Good luck, BadRam!

Let us know how it went!

392's or long tubes?

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