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Increasing Horsepower/Torque/MPG

25 messages,  Last post on Mar 23, 2010 at 4:42 PM

You are in the Speed Shop Tuning and Modification Forum.

What is this discussion about? Performance Mods

Messages Page 2 of 3

#6 of 25 ESTIMATED HORSEPOWER?? by chevyguy5

Mar 29, 2006 (11:39 am)

I HAVE A 327 11:5-1 COMPRESSION 2.02 INTAKE VALVES ON THE DUMPLE HUMP FUELLEE HEADS LUNATI 2-6OOORPM RACE CAM WITH VICTOR JR INTAKE AND MIGHT DEMON 650CFM CARB ON TOP
BOTTEM END IS BRAND NEW AND WAS BALANCED WHEN IT WAS BUILT
IGNITION IS HEI SUPERCOIL AND I RUN HOLLEY ELECTRIC FUEL PUMP. THIS SET UP IS INSIDE A 81Z28 AND I AM WONDERING WHAT KIND OF HORSEPOWER CAN I EXPECT THIS THING TO MAKE
BEFORE THE VICTOR JR INTAKE AND DEMON CARB IT RAN A SAD 14.2 IN THE 1/4 MILE AND I WONDER WHAT KIND OF POWER IT MAKES NOW WITH THE NEW TOP END. ANY ESTIMATES WOULD BE WELCOME AND IM JUST LOOKING FOR A GUESS UNTIL I CAN GET IT ON A DYNO. THANKS ALOT AND KEEP MAKIN THAT POWER

#8 of 25 K&N filter assy. by mtrialsm

Apr 03, 2006 (4:43 pm)

Just installed a K&N air filter assy. on my 4.7 Quad.
Very neat installation, the hardest part was putting the
rubber seal around the new air box.
At normal acceleration and speeds, sounds is almost the
same as stock, but under hard throttle the noise is high.
A dyno print out was in package, at 4400 rpm they showed
an 8 HP gain. I doubt that I've ever had the rpms over 4000
anyway.
I'll monitor mpg. Power seems smoother and a little more responsive?

#9 of 25 Re: K&N filter assy. [mtrialsm] by Mr_Shiftright HOST

Apr 04, 2006 (10:30 am)

Replying to: mtrialsm (Apr 03, 2006 4:43 pm)
Generally any HP gains with a free flow air filter will come at very high RPM and will favor larger engines over smaller ones.

#10 of 25 K&N and check engine liight? by mtrialsm

Apr 17, 2006 (8:09 am)

Drove to Fla. last week, maybe a slight increase in MPG?
Coming back home and after putting 400 miles on truck
with new K&N intake, the engine stumbled and sputtered a couple of times at a red light. Then the check engine light came on.
Engine smoothed back out and ran flawless for the next 100 miles back home. Checked the mal. engine code and it was
"O2 sensor, lean". I reset the code and will monitor for a repeat.
Has anyone esle seen this after going to a high flow intake system?

#11 of 25 Re: K&N and check engine liight? [mtrialsm] by cydd420

Jul 27, 2006 (8:57 pm)

Replying to: mtrialsm (Apr 17, 2006 8:09 am)
99 S-10 K&N replacement filter in stock air box. First 100 miles ran like crap. Asked a mechanic friend and he said to get the K&N cleaner kit do a really light cleaning on it. Do not follow the directions when reappling the red oil. He said to just spray it on with one quick swipe. Too much oil on it from the factory was clogging one of the senors.

#12 of 25 Re: K&N and check engine liight? [cydd420] by the_big_al

Jun 27, 2008 (4:16 pm)

Replying to: cydd420 (Jul 27, 2006 8:57 pm)
I ran a K&N in an '01 4.3 in the stock air box. Took it out after a few months and went back to cheap paper... I noticed a slight drop in MPG with the K&N and no real increase in HP - at least not noticable...
 
With out doing serious engine modification, I don't know that there is a real effective way to really make a factory tuned engine "perform". You can do chips and ECM programs, exhaust systems, K&N filters and such, but do they really make a difference?
 
Would I really see a difference in the performance of a 4.3 chevy motor with a cold air intake, a ECM reprogram, and a free flowing exhaust system? I have done cat-back to dual 2 1/4's, but it is mostly sound. If it would make a difference I would be willing to do a full exhaust system including new headers, a free flow cat and new mufflers. The truck has 104K on and so no worry's about the exhaust warranty. Also reprograming ther ECM and doing a full cold air intake, but only if it would make a noticable difference. Not just some measly 10 HP. If not than I'll just stick with the stock until it needs to be rebuilt and then either rebuild it and bore it out and stick a super charger on it, or completely replace with a LT-1 crate motor.....

#13 of 25 Re: K&N and check engine liight? [thebigal] by xtec

Aug 21, 2006 (12:42 pm)

Replying to: the_big_al (Jun 27, 2008 4:16 pm)
I put in a K&N replacement filter on my 06 Charger 3.5 and I had less power and lost 2 mpg with it.I think the K&N is a waste of money.I heard of others who say they don't feel any differance with a K&N.I was thinking about a Jet chip,
but read some customers reaction ,and some say they work and some say its a waste of money.It must depend on the vehicle you put them in.I did have a dual Borla cat back system put on and feel a little more power and MPGs.

#15 of 25 Re: Increasing HP/TQ/MPG [illicit_hunter] by 97bandit

Oct 09, 2006 (3:56 pm)

Replying to: illicit_hunter (Aug 18, 2005 4:54 am)
did you find a high-flow cat yet?

Messages Page 2 of 3

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