Chevrolet 8.1 Vortec advice

Tom Meyer · 01-03-2021, 06:11 PM

We tow with a 02 Suburban 3/4 ton 4l85E trans, 4.1 gears 265/65 /16 tires. We got about 7mpg. This last year got rid of the cats put in a balance tube up front and a flowmaster cat back system on. From there we went on a wheel dyno for the tuneup, picked up 50 lb of toque and 40 hp at 2300 rpm. It has great power towing but now gets 7mpg. We will be doing a intake mod [google 8.1 mod] have the intake done just need to install it. I just do not think these almost 500 ci motors are made to get mileage, but they pull great and are cheaper to maintain than a diesel. Tom

01-03-2021, 06:11 PM	#7
Tom Meyer Senior Member Join Date: Aug 2003 Location: Pierce NE Posts: 936 Likes: 78 Liked 354 Times in 120 Posts	Re: Chevrolet 8.1 Vortec advice We tow with a 02 Suburban 3/4 ton 4l85E trans, 4.1 gears 265/65 /16 tires. We got about 7mpg. This last year got rid of the cats put in a balance tube up front and a flowmaster cat back system on. From there we went on a wheel dyno for the tuneup, picked up 50 lb of toque and 40 hp at 2300 rpm. It has great power towing but now gets 7mpg. We will be doing a intake mod [google 8.1 mod] have the intake done just need to install it. I just do not think these almost 500 ci motors are made to get mileage, but they pull great and are cheaper to maintain than a diesel. Tom __________________ Tom Meyer 5240 SS Stock ??? Last edited by Tom Meyer; 01-03-2021 at 06:16 PM.