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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 1 of 3

#1 of 25 Increasing HP/TQ/MPG by illicit_hunter

Aug 17, 2005 (6:39 am)

I own a 1998 Dakota Club Cab with a 318 (5.2) in it. It is a 4WD truck. So far I have put straight pipes on it (back from the cat), a K&N FIPK Intake, and a new serpentine belt that routs underneath the A.C. Compressor. Is their anything else that I can do to increase HP, TQ, and MPG??????? I have heard that punching out that cat and just welding it back up their for "apperance for the coppers" will increase all of these.

#2 of 25 Re: Increasing HP/TQ/MPG [illicit_hunter] by Mr_Shiftright HOST

Aug 17, 2005 (7:41 am)

Replying to: illicit_hunter (Aug 17, 2005 6:39 am)
Not a good idea.
 
You can probably find a freer-flowing catalytic for the car and that might give you something like 8 HP. For fuel mileage you can run harder tire pressures and not use your AC as much, and you might try synthetic oil as well. As for more HP and torque, you're going to have to go into more exotic modifications and that can get expensive...you might investigate custom throttle bodies, custom intake system and finally internal engine modifications.

#3 of 25 Re: Increasing HP/TQ/MPG [Mr_Shiftright] by illicit_hunter

Aug 18, 2005 (4:54 am)

Replying to: Mr_Shiftright (Aug 17, 2005 7:41 am)
Thanks, I already eliminated the temptation of using the A.C. by getting a routing a new belt totally bypassing the compressor, i will look for a high flow cat

#4 of 25 Re: Increasing HP/TQ/MPG [illicit_hunter] by dakota0

Dec 30, 2005 (11:51 am)

Replying to: illicit_hunter (Aug 17, 2005 6:39 am)
have you tried to get a chip for it..i heard in the 5.2 and the 5.9's you can get a stage two chip and its suppose to wake it up..you can also get headers and a low restriction cat for it too.

#5 of 25 4.7 monster by dakota0

Dec 30, 2005 (11:54 am)

i have a standard 2000 4.7 dakota sport. its a lil quick for what it is. ive put on it gibson headers with the racing gibson duels high flow cat k&n tube with filter a throtal body spacer and a tornado can you estimate the power it has now...i can stay with 4.6 mustang gt's now

#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?

Messages Page 1 of 3

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