This is more or less what I meant, and I havent seen the MAF mod before, and will look into that more once I start on a 411 swap
5.7 vortec mpg
- Thread starter CRF450R
- Start date
Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.
CRF450R
Truckin'
I also removed that honeycomb thing aswell once I get my injectors and new fuel regulator done I'm sure with these mods and new injectors it'll feel like a new truck again I hope cause as it sits is so gutless I'd probley loose to a gutless 6.2 diesel
Mark Gilbert
I'm Awesome
I've never agreed with removing the honeycomb. The amount of air that it restricts doesn't seem that substantial, but the fact that it regulates the airflow across the sensor poses an advantage.
If the restriction is that big of a deal I would do the 0411 swap and then run speed density and eliminate the MAF altogether...
If the restriction is that big of a deal I would do the 0411 swap and then run speed density and eliminate the MAF altogether...
L31MaxExpress
I'm Awesome
Not a fan of eliminating the MAF myself. Newer vehicles and non GM vehicles do not have a screen.
Trenton
Just a Texan transplanted in the Rockies
A tune will help IMMENSELY. I have a blackbear tune on my '98 K3500 5.7 CCLB SRW on 33s and got my truck calibrated for premium octane fuel, the larger tires, aftermarket intake and exhaust, cat delete, and rear 02 delete. I can see this 7000 pound truck get 1-2 mpg better now than it did before all the mods. Even with stock tires I only got maybe 12 mpg on the highway. Now, i can get 13.4ish and I've seen as high as 16.8 mpg on flat roads in western Colorado (mile high elevation helped).
That's about what I get too on my 1998 Sierra pick up truck 4X4 5.7L
Racer X from MKE
Newbie
I have a 1997 5.7 Silverado and I installed the Borg Warner MPFI unit on it. It cost under $300 and a much noticeable improvement.
L31MaxExpress
I'm Awesome
I had the GM one in mine from 2006 until I upgraded to the marine intake.
With the GM spider I found the pressure substantially lower than the factory spider. Factory spider was 66 psi. The MFI spider was 60. I removed the upper plenum, hooked the fuel lines back to the spider. Connected power to the pump and adjusted the MFI spider to 66 psi.
I bought my ‘98 K1500 new and it has 218,000 miles on it. I check my mileage on every fill up and never got better than 13mpg since I can remember. My motor is all stock. It has a few oil leaks and is burning some particularly on start up. I always felt it should get at least 16-18 anyway. I still wouldn’t trade it because of that.
You won't get through to him haha
