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2005 chevy trailblazer_ls
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If you want the plugs go for it

If you want the plugs go for it. I had Nology hot wires on my old car every plug had to be grounded. It did give more hp and a little mpg but it's just as it is with modifying anything on a car. Once you change something it causes something else to go bad quicker for the most part. Anyone that has ever modded a car should know that.
I also had those ground wires for the battery that got grounded 8 diff times. I swore i saw an increase in throttle response and mpg from that.
 

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2006 chevy trailblazer_lt
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100 Posts
CAI is beneficial if you have a highly modified engine. There is a reason why they don't come out of the factory with one. You can pump all the cold air you want into ECM/PCM based motors and its going to run at the programmed fuel ratio mapping. More air goes in the ECU see's a lean issue and pumps more fuel in. Too much air and it flips a code or your truck runs in limp mode or even better burn out O2 sensors. The only thing I see in getting better gas mileage is reducing weight. The motor is only going to do what the computer tells it. Try lighter tires and wheels. Lighter composite body parts or if you don't use your back seat take it out.Hey maybe go on a diet and lose 20 pounds! Combustion chamber motors have a slim margin for that extra performance and better gas mileage. Its a challenge just to get 40% efficiency at full load. I average 19mpg on the highway with a load. Sometimes with a good tail wind I can put out 22mpg without a load. No mods just regular GM specified maintenance (Not dealership advised) yes there is a difference. Course other major factor include driving habits,methods and region or terrain.
 

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2003 chevy trailblazer_ls
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1,236 Posts
tb2006, good post. Well said. Only thing I'd add is that any additional increases could only come from an increase in volumetric efficiency. That typically comes only with modifications to hard parts, like camshafts, cylinder heads, piston domes, valve sizes, and carefully port-matched intake and exhaust.

Some gains are to be had in airflow management -- smoothing (or in some cases not) the air flow in and out makes horsepower, but in a stoiometric A/F ratio (14.7:1 for gasoline), the X amount of fuel is added for X amount of air, and that cannot change much and stay within physically practical parameters.
 

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2005 chevy trailblazer_ls
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CAI is beneficial if you have a highly modified engine. There is a reason why they don't come out of the factory with one. You can pump all the cold air you want into ECM/PCM based motors and its going to run at the programmed fuel ratio mapping. More air goes in the ECU see's a lean issue and pumps more fuel in. Too much air and it flips a code or your truck runs in limp mode or even better burn out O2 sensors. The only thing I see in getting better gas mileage is reducing weight. The motor is only going to do what the computer tells it. Try lighter tires and wheels. Lighter composite body parts or if you don't use your back seat take it out.Hey maybe go on a diet and lose 20 pounds! Combustion chamber motors have a slim margin for that extra performance and better gas mileage. Its a challenge just to get 40% efficiency at full load. I average 19mpg on the highway with a load. Sometimes with a good tail wind I can put out 22mpg without a load. No mods just regular GM specified maintenance (Not dealership advised) yes there is a difference. Course other major factor include driving habits,methods and region or terrain.
Wouldn't the CAI w/ the K&N or equivalent save gas in that it would take load off of the cylinders, because air is drawn in by way of vacuum as a result of the piston action and if the filter lets in more air that would save gas by reducing the strain on the engine thats produced by the normal aspiration process...Its the same idea of turbos squeezing economy and power out of some cars. Which it seems like glfredrick was getting at with the air management he mentioned in his last post, now that i read it :)
 

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2002 gmc envoy_slt
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If horsepower gains are what is wanted why are you leaving the Clutch fan attached to the engine and not converting over to twin electrics?

I would have thought this would have been #1 or #2 on the list.

Also of course getting All Terrain tires off the vehicle if equipped!
 

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Basic Vendor- Skid Plates
2007 chevy trailblazer_ls
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3,700 Posts
Wouldn't the CAI w/ the K&N or equivalent save gas in that it would take load off of the cylinders, because air is drawn in by way of vacuum as a result of the piston action and if the filter lets in more air that would save gas by reducing the strain on the engine thats produced by the normal aspiration process...Its the same idea of turbos squeezing economy and power out of some cars. Which it seems like glfredrick was getting at with the air management he mentioned in his last post, now that i read it :)
Not really... There is so much vacuum being generated between the valves and throttle, and so little airflow when you are talking about driving for gas mileage, that it really doesn't have a perceptible difference in economy.

Having said that, it COULD have a difference in mileage going WOT up a mountain while towing a heavy trailer.

Mike
 

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The True FLow CAI dyno chart shows an improvement on torque and horsepower across the board. If there were no gains to be made no one would care a bit about cold air intakes, but just try and find any high performance vehicle that doesn't somehow manage intake are in this fashion.

Straightening, making laminar, and cooling intake charge air all work in concert to increase volumetric efficiency of the engine -- albeit a small amount (the True Flow makes about 8 hp over stock) worth it if you are looking for best performance.
 

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Not really... There is so much vacuum being generated between the valves and throttle, and so little airflow when you are talking about driving for gas mileage, that it really doesn't have a perceptible difference in economy.

Having said that, it COULD have a difference in mileage going WOT up a mountain while towing a heavy trailer.

Mike
Well i always noticed an increase in mileage everytime I put on a CAI and when I left my lead foot at home....
 

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I just got me a set of granatelli mpg plug wires they guarantee up to 15% better mileage and I picked up an average of 2 more mpg with them. They have a 30 day money back guarantee if you aren't happy with them. They were $93 shipped.
Where does that wire go
 

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Now big jet aircraft use nitrogen in landing gear because it is inert and will not aid in fanning any flames that might be present in an emergency situation. But in automobiles... it is just a rip. And there are actually people selling (and thus buying) nitrogen for their tires.
Some of the spiel for nitrogen is that the molecules are bigger (more complicated) and they don't 'escape' through the air barrier in the tire (tube or inner carcass).

That's really not a good argument since, like you said --- 78% of the air we breathe (except in California and Denver) and if you just allow the tires to get a little low and then refill them, you have more pure nitrogen in the tire since the oxygen left the party - slowly, mind you.

So --- adding more 78/22% Nitrogen/oxygen mix kinda ups the nitrogen level a tad bit.

Not enough to matter - but it goes up a bit.

I am pretty sure that the explosive value of oxygen in the tires isn't even in the equation.

BTW: gasses aren't rated as "inert' any more. "Nobel" is the correct term IIRC.

Sorry for reviving a zombie thread - but this just hit my eye.
 

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The True FLow CAI dyno chart shows an improvement on torque and horsepower across the board. If there were no gains to be made no one would care a bit about cold air intakes, but just try and find any high performance vehicle that doesn't somehow manage intake are in this fashion.

Straightening, making laminar, and cooling intake charge air all work in concert to increase volumetric efficiency of the engine -- albeit a small amount (the True Flow makes about 8 hp over stock) worth it if you are looking for best performance.
Once the air turns a corner or passes a butterfly plate or hits the runners in the intake or hits the backside of the intake valve - laminar flow has gone bye-bye!

I ran a dyno shop in Anaheim for years and secretly laughed all the way to the bank with wheelbarrows full of guys money from using no-resistance air filtration (multiple stock elements, stacked 3 or 4 tall) and as straight as could be created intake runners.

They meant nothing in the long run on the dyno (where the horses meet the ground) unless they had the cam set for the potential airflow difference and a different ignition advance/retard profile. Mill the heads to raise the compression - add more octane (in those days we had real gasoline) and polish both the intake and exhaust ports making them bigger at the same time.

All this was only really accessible at WOT - street driving negated all the snakeoil additions. Run at the dragstrips and change the plugs after every run and make sure the block was TOTALLY COLD before you fired up behind the lights - and MAYBE you'd get a horse or two more. Not worth it.

I ran a few cars at the drags almost all summer long - it was fun but once it became a factory slide rule operation (I blame Chrysler for the loss of interest by the 'run-what-you-brung' crowd) and cars were factory trick-rigged with secret factory unobtainium parts - it was over.

So today there's products like K&N - which is a pox on everything I've ever run into - even lawnmowers get dirty air - and I've seen the fresh air side of turbos eaten down to no-fins from impinging dirt and debris from K&Ns.

K&N isn't car-viagra.




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