I recently put some 30 inch all terrains on my blazer. At a dead stop, if i floor it, it sounds like its struggling to go. I put a k&n filter in last weekend to help add a lil more air in the engine cuz its over 100 degrees over here and this truck isnt use to this. I bought it in wyoming and it never seen 90 degrees over there so im thinking thats another issue i might be having. When i let my truck idle for about 30 mins the other day, anti freeze was coming out so i freaked and looked at my temp. It was about 230 degrees. I turned the heater on and it cooled off in 2 minutes. I got home and jacked it up but didnt find the leak or anything and i ran it while i looked and still nothing so my dad and uncle told me it probably just got a little hot. No big deal.

Is there something i can do so my blazer doesnt feel like its struggling to get up to speed?

 

Sorry, but adding extra weight to anything that needs to rotate is going to slow you down a bunch. Imagine trying to spin a merry-go-round to 50prm in 5 seconds, then you add people and try to spin it to 50rpm in 5 seconds. It takes a lot more work, which is what you are doing by adding larger/heavier wheels or tires.

If you do some searches, you could probably see how adding Xlb of unsprung weight(rotating) is equal to xxlb sprung weight(passerngers/cargo).

Here's something I found real quick.
http://www.audiworld.com/tech/wheel13.shtml

 

ok well now i want to know how i can get some more powet without spending alot of money. Hypertech programmer, throttle body spacer, under drive pulley, mass air flow sensor, k&n air intake, exhaust. Thats what i know but im sure some of you guys have some secrets. I'd like to know how to get some power out of my little v6.

And what exhaust is best? I heard flowmaster is good but i also heard gibson is better. What is a cheap exhaust i can put that gets me some good sound and power?

 

That should do some good. Looking at the exhaust though, it has small pipes off each manifold into some decent size, then through about 3" for the converter, then it reduces back down going into the muffler. At least that's the way it was on mine. I've got a home-made 2.5" catback now though.

You might want to throw up some specs on year/engine/etc.

 

I would get a custom tune. See if you can find a tuner shop close to you that can do the work that way you can have things changed if they are not to your liking. Places like PCMforLess.com, Wait4me, etc have mail order tunes that are better than hypertech.

You will want to read up on these things. The TB spacer doesn't really work on these engines. The underdrive pulleys can have some negative side effects. The MAF is good until you do major mods internal to the engine to improve flow.

In terms of mufflers, it all comes down to sound, not necessarily performance. Your 4.3L won't test the flow capabilities of an aftermarket muffler. Freeing up the exhaust by adding headers and/or a large y-pipe (don't go too large) will help as well. Some of the best stuff you can get comes from your local tube bending muffler shop. Make it custom.

And to reiterate, all of this stuff has been covered in other threads. Search and read.

 

I can get a custom tune from a few places around me but what they do is put my truck on a dyno. Ok now since they have a base to start at, they then mess with the timing chain and make a few more adjustments using a computer. There is a pro and con for this.. Pro: i can get probably twice the power from a custom tune vs. A programmer. Con: Everytime i want to add something to my engine, i have to re-tune. Its $500 which isnt bad but you will be spending more than that in the long run if you add bigger tires, more air flow, lift kit. Anything dealing with the performance of your vehicle, you habe to go back and re-tune to your adjustments.

With a programmer, i can tune my vehicle to my liking and when i decide to add something to my truck, all i have to do is plug in the programmer and make adjustments.

 

You cannot make adjustments with handheld tuners aside from speedometer corrections. If you want to make timing, fuel table, or just about any other adjustment possible, you have to get a program like EFILive or HPTuners.

 

your also forgetting shift points and tire size. But yes you are correct. About how much hp can you gain from the tunes you stated? And can i still use reg unleaded? And how easy is it to use? I read about them on the site you mentioned but didnt get that much info.