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GMC 8.1 2500HD Random Upgrades


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I have a 2001 Sierra 2500HD EC LB 4x4 with 3.73 rear. I just bought it about a week ago. It has 115k miles. It's super clean. I has a small oil leak and probably burns oil just like any other 8.1L. I'm in the process of getting all fluids, plugs, and wires changed. It has a dual exhaust too.

 

Anyways, I'm super excited about this truck. I upgrades from a Dodge Dakota 5.9 V8 which was a gas hog. It didn't get much better mileage than this thing! (11-12 avg vs 10-11 avg) I'm super happy because this is much more of truck than my old one. I'm starting to get used to driving something bigger too. I've driven many military trucks in my time because I was in the Guard for 6 years. Anyways, let's continue.

 

Considering I want to take really good care of this truck, I want to get the best bang for my buck. I plan on getting a toy hauler in the next 1-2 years (God willing). They aren't light. It will probably max around 10k if I get a bumper pull. It will be more like 13k if I get a 5th wheel.

 

So, here's my thought process... I want to possibly do the following mods

 

Bigger tires & different wheels (Max 265/75r16 or 285/75r16 with torsion lift)

Chip (I'm thinking Black Bear because I haven't heard anything bad about them)

CAI (Not sure if it's worth the money)

Headers (Small possibility)

A few cosmetic items like Westin Bull Bar, Fenders, Lights, etc.

 

Anyways, let's tackle the tires issue. I used to make fun of these trucks with the little 245/75r16. After being on forums reading about the science behind these things, I learned about torque, hp, gear ratios, and tire sizes. These little tires unfortunately are how GM designed these trucks to run. Maybe for someone that isn't as superficial as myself wouldn't care. My thought is that I have waited a long time for a truck of my own (that is paid off btw), so I want it to look good! Lift kits (4 and 6 inch) are super spendy, so I'm willing to do a leveling kit and go up to 265/75r16s or 285/75r16s. Both would be on a 16x8 wheel. I'm thinking Dick Cepek DC-2s. I hopefully will post a pic of my rig shortly.

 

I'm wrestling with lost mpgs, lost power, lost whatever for the sake of having tires that actually look good and are probably more functional when it comes to clearing small obstacles. I'm not off road a lot, so I can't justify it like some people do. However, I want imput on lost power moving up to these sizes. 265 vs 285 is so minimal that I'd rather just go to 285 than 265. I do probably want a mud tire like Toyo MT or BFG AT because they look good and are good tires. They are just heavy so there is more mpg loss. Any imput would be great.

 

More pics. I will try to get one of my truck soon!

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Beatiful truck!!... all i can say is 'RAYLAR' and 'STAINLESS WORKS' all raylar does is 8.1,s and stainless works is the only company that makes long tubes for an 8.1.. the stainless works websites doesnt have any 8.1 trucks on there website.. so i talked with them and there goona install there headers for me and use my truck on there website for dyno results and audio/video..

these are proven numbers.. If you do the long tube headers and raylars 103 or 106 cam its a 90-100 HP difference.. if you look on you tube you can see the on truck being dynoed, and made 266 at the tires stock and after made 354!!! the headers are like $890 and the cam is around $450-460.. I cant wait..

Give me a call if you want, i did alot of reaserch.570-656-2466

The best thing to do would be start with the headers or both then do an in person tune with justin from black bear to fine tune everything.. Those HP numbers are with a professional custom tune.

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Awesome looking truck! If you like the 8.1 now, wait till you you do a BB tune, It will wake it up. I went to 285's with minimal MPG loss. Right now with all in town driving I see 10 to 10.5 Have seen 13.5 to 14 on highway trips. I haven't done any of the engine work Yukon^ is talking about but that sounds awesome, wish I had some money to blow. lol Keep us updated on the project!

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Yea i cant wait man..I was on the phone with the guy from raylar for like 30-35 mins.. and everything he said made sense..496 cubic inches..... is capable of so muvh more then they all put out stock,there set up and so detuned the wat they are for emissions/government, the cam is one of the biggest things. there cam designs make the 8.1 work the right way.. Just a cam swap is around 60 HP, with the long tube headers its close to 100 real HP.

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