performance /fuel economy/free horsepower

[Customization]

i have a 1995 gmc yukon with a flowmaster mulfler. i was wondering what i could do to make this thing more fuel efficeint. specially free is better.
headers
Air intake
Full exhaust
Mild cam
E3 spark plugs
throttle body spacer


would upping the fuel pressure would help any???

[bobfig]

im assuming you have a 350. but usually the tbi mod and getting a good tune.

[nick613]

Headers, high flow cats, TB mods, TB spacer maybe, tune for sure but they are a little harder to do on the TBI trucks.

[94_c/1500]

There's alOt of TBI threads already, read through the sticky threads. But here's my advice:
-Jegs air tube or GM equivalent
-Hypertech Powercharger or home made equivalent
-pod spacer
-throttle body spacer
-ported throttle body
-long tube headers
-better y pipe or dual exhaust
-high flow cats, such as Thunderbolts
-high flow mufflers- such as turbo style or Spintech mufflers
-custom chip burned
-complete tune up, use quality parts and only AC Delco spark plugs
-change all fluids, synthetic is a good idea. I use Royal Purple
-dropping weight will help too

You can try playing with fuel pressure. And balanced injectors may help. I haven't gotten around to do that yet.

What is the axle gear ratio? Tire size? Engine?

[chucksrt]

put the truck on the dyno and see where it stands right now , make sure to have a/f readings and then do a couple mods at a time and see where your a/f is then and then get a tune based on your dyno results to get your a/f back.

[BlacK20]

Search, this has been covered thousands of times!

[phoebeisis]

Modifying your driving style is free-costs maybe 1-2% extra time in city driving usually not even that. Usually Pulse and gliding will get you 15-20% better fuel economy in city driving. Setting the cc at 62mph will get a 95 2wd 18 mpg 4x4 maybe 17mpg- staying under 70 mph is a good idea-they are really thirsty over 70 mph.
45- psi tires vs 32 psi is worth maybe .3mpg
Usually bolt ons don't help much-
Custom tune- I just don't know-GM engineers know how to tune for FE,so ...
Save your $$-modify your driving style

[Customization]

How about an intake mod to the breather

[Customization]

How about using 5.3L headers

[bobfig]

How about using 5.3L headers

http://i698.photobucket.com/albums/vv344/bobfig/godzilla_facepalm_godzilla_facepalm_Facepalm_colle ction-s640x387-82177-580.jpg

[Customization]

Why not ls header no good? And for the intake mod i mean like change the plastic piece to a straight through one and why use ac delco plugs instead of e3

[BlacK20]

Why not ls header no good? And for the intake mod i mean like change the plastic piece to a straight through one and why use ac delco plugs instead of e3
they wont even come close to working.

[nick613]

Why not ls header no good? And for the intake mod i mean like change the plastic piece to a straight through one and why use ac delco plugs instead of e3

LS exhaust manifolds are physically a different size and wont bolt up, wouldn't imagine they would flow any better either... e3 plugs are a gimmick. You can change the intake tube but it really wont help you out that much...

[nick613]

http://i698.photobucket.com/albums/vv344/bobfig/godzilla_facepalm_godzilla_facepalm_Facepalm_colle ction-s640x387-82177-580.jpg

yup

[Customization]

Ok I'm a bit of a newb seeing its my first truck its a 95 gmc yukon with a tbi 350 3 73 gearing. And a 4 speed auto

[bobfig]

Get something like these and get them ether ceramic coated somewhere or strip them and use some high heat paint and paint them yourself as the paint they come with is crap and burns off on the first heat cycle. You could step up and find some stainless steel header as your up in canada and rust would be my first consern.

www.summitracing.com/parts/PSM-70-2260/

You would also need a shop to fab up a y pipe and the rest of the exhaust.

[silverado_lover]

I went through the whole "ima maik dis tbi hur fst" phase...








not worth it IMO

[BlacK20]

I went through the whole "ima maik dis tbi hur fst" phase...








not worth it IMO

:word:

[nick613]

I went through the whole "ima maik dis tbi hur fst" phase...








not worth it IMO

x2

If you're really going to dig into the engine it is possible to make a pretty mean TBI small block but all the basic mods and bolt ons don't ammount to much.

[Pedl]

what would you guys say for a 94 suburban with the 454?
what should be the first things I do when thinking about more performance?
air intake?
tbi spacer?
I also need a new fuel pump, so should I also get a fuel pressure regulator?
headers/exhaust system? 2,5" Y-pipe? which headers would you recommend?

thanks

[gmctrucks]

I have underdrive pulleys if anything it woke up my engine I also have the whole MSD set up on my truck a free flowing Cat is good.

[Snowboi]

FYI, e3 plugs suck, same as that crap about tornado fuel saver and that zmax crap.

A tune (ac delco plugs, fuel filter, plug wires,.air filter), GMPP intake, TBI mods, long tube headers, high flow cat, a decent straight muffler (flowmasters are chambered, also, not the best flowing mufflers, but sound nice). Run a can of SeaFoam through the gas and a can of SeaFoam through the intake.

Sent from my HTC Incredible 2 using Tapatalk.

[Customization]

So on a budget new y pipe i can make or buy and it has a flow pro muffler looks like cat back that was on itwhen i bought it. How much for sea foam.pribably goint to do my own exhaust header back aee how im apprenticin at being a welder ... Lots of cool tools i can use .




Fpr right now ilk do y pipe and see foam after this summer tbi spacer and full exhaust along with high fliw cat so i can be legal. Wokd it be pissible to make a tbi spacer seeing how i am in a wwelding shop

[Customization]

Plug wires i have some in the ahop iff a truck cause my dad crushes cars they are blue appear to be afermarket qillvon form u tonight what they are ahouldvi change em.. Also how about power supply for distributer goodbor bad i dea

[BlacK20]

Plug wires i have some in the ahop iff a truck cause my dad crushes cars they are blue appear to be afermarket qillvon form u tonight what they are ahouldvi change em.. Also how about power supply for distributer goodbor bad i dea

i honestly cant figure out what the heck your saying here? :think:

[GreenVortec]

lmfao

[Snowboi]

Plug wires i have some in the ahop iff a truck cause my dad crushes cars they are blue appear to be afermarket qillvon form u tonight what they are ahouldvi change em.. Also how about power supply for distributer goodbor bad i dea

What the?? So your dad crushes cars that are blue, how..... Nevermind, I get it.

My truck is green, so by the color being a dark green, I have an extra 100hp.....

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[Customization]

sorry spelling mistake as i was in class one of the truck s had blue plug wire would the help if they in good conditions

[silverado_lover]

http://2.bp.blogspot.com/_l2VT7bYUEaY/TNcKapTvWrI/AAAAAAAALKQ/up8q0FjIdog/s320/do-i-be-posting-in-a-troll-thread.jpg

[GreenVortec]

what the f***... buddy i think you should pay more attention in class LMFAO

[Snowboi]

So, blue wires give you 50hp? It doesn't matter what color they are, MSD has some great wires, same for accel.

The best and the cheapest/free way to get mpg/fuel economy is to have a light foot, keep a steady foot on the gas when comic.g from a stop. Check bad vacuum lines.

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[Customization]

what i ment is that they where blue didnt know what brand and they wernt stock if they are any think after market would it be benifitial

[Customization]

and what are underdrive pulleys

[Customization]

ok so i looked into the numbers ....im going to redo the engine so i have a fresh plater then im going to to do the heads to some edlebrock ones with a cam that will increase low end torqu full exhaust 3 inch single frol headers back and. tbi spacer, balanced injectors anything else

[Customization]

ok i i think i need a new engine. so this summer i wil rebuild her up with new aluminum better flowing heads from edlebrock, a torquy cam what should i go with here? headers, tbi spacer, and that sit i think