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Speed Shop Tuning and Modification Increasing Horsepower/Torque/MPG
21 messages, Last post on Sep 27, 2007 at 5:36 AM
You are in the Speed Shop Tuning and Modification Forum. Your Host is steve_
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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?
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Replying to: mtrialsm (Apr 03, 2006 3:43 pm) |
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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? |
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Replying to: mtrialsm (Apr 17, 2006 7:09 am)
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Replying to: cydd420 (Jul 27, 2006 7:57 pm) 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.....
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Replying to: the_big_al (Jun 27, 2008 3:16 pm) 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. |
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Replying to: illicit_hunter (Aug 18, 2005 3:54 am) |
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most cars are factory tuned for mpg and moderate perfomance but mostly for reliability and driveability. there are no 50 dollar mods that your gonna feel. and when you start make changes that you can feel you give up some of the previously mentioned comforts. do your research some motors like back pressure and so when you releive them you actually go backwards. the quickest way to improve quarter mile times is by changing the gear ratio. this comes at a cost though and that is fuel. remember a v8 at 275-300hp in a stock application is maybe 20 hp from max out without internal mods 
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Replying to: okko1 (Aug 16, 2007 4:30 pm) -mike
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