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Increasing Horsepower/Torque/MPG

21 messages,  Last post on Sep 27, 2007 at 5:36 AM

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#12 of 21 Re: K&N and check engine liight? [cydd420] by the_big_al Jun 27, 2008 (3:16 pm)
Replying to: cydd420 (Jul 27, 2006 7:57 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..... Replies to this message: xtec (Aug 21, 2006 11:42 am) tc07 (Sep 27, 2007 5:36 am)
#13 of 21 Re: K&N and check engine liight? [thebigal] by xtec Aug 21, 2006 (11:42 am)
Replying to: the_big_al (Jun 27, 2008 3:16 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 21 Re: Increasing HP/TQ/MPG [illicit_hunter] by 97bandit Oct 09, 2006 (2:56 pm)
Replying to: illicit_hunter (Aug 18, 2005 3:54 am) did you find a high-flow cat yet?
#16 of 21 why i don't know by okko1 Aug 16, 2007 (4:30 pm)
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 Replies to this message: paisan (Aug 16, 2007 5:21 pm) okko1 (Aug 19, 2007 3:28 pm) Mr_Shiftright (Aug 19, 2007 5:45 pm) and 1 more...
#17 of 21 Re: why i don't know [okko1] by paisan Aug 16, 2007 (5:21 pm)
Replying to: okko1 (Aug 16, 2007 4:30 pm) Actually I'd argue that most V8s are the ones that can best feel gains from free-flowing exhaust. After that Turbo cars will feel it the most. 4 and 6 cylinder engines need that back-pressure.   -mike Replies to this message: okko1 (Aug 19, 2007 3:28 pm) Mr_Shiftright (Aug 19, 2007 5:45 pm) paisan (Aug 19, 2007 7:56 pm)
#18 of 21 Re: why i don't know [paisan] by okko1 Aug 19, 2007 (3:28 pm)
Replying to: paisan (Aug 16, 2007 5:21 pm) well i have been building street cars for some time and it is true that if you were to go from a single exhaust stock high restriction muffler to a dual exhaust with a quality after market high flow mufflers you might see some minor improvement in performance but for the most part it's just gonna sound fast. the hp gains that k&n and many of these other after market vendors discribe are at wide open throttle and maximum rpm. in which case are not remarkable for the most part. i am not saying that there is no measureable gain i am saying that unit of gain would not be felt by the seat of the pants. Replies to this message: Mr_Shiftright (Aug 19, 2007 5:45 pm) paisan (Aug 19, 2007 7:56 pm)
#19 of 21 Re: why i don't know [okko1] by Mr_Shiftright HOST Aug 19, 2007 (5:45 pm)
Replying to: okko1 (Aug 19, 2007 3:28 pm) Yep. The bigger the engine and the higher the rpm, the more HP will show on the dyno (and it will be modest at best). Replies to this message: paisan (Aug 19, 2007 7:56 pm)
#20 of 21 Re: why i don't know [Mr_Shiftright] by paisan Aug 19, 2007 (7:56 pm)
Replying to: Mr_Shiftright (Aug 19, 2007 5:45 pm) I agree, especially on 4 cylinder cars, intake and exhaust will be modest at best.   -mike
#21 of 21 GM 4.3 HP Increase, MPG increase by tc07 Sep 27, 2007 (5:36 am)
Replying to: the_big_al (Jun 27, 2008 3:16 pm) On GM's 4.3 engine with distributor ...up to at least 2001 model as I had, Put on an MSD Ignition, HP distributor module, rotor and cap. Next add MSD ignition coil and Taylor (or a good set) of wires. Then put in AC Delco Rapid Fire or Bosch +4 sparkies. I did this and GAINED 5 MPG highway and Dyno'd 28+ HP! I then added Hypertech Power programming due to having to put on 245/50/15 tires and traction bars to get needed traction on dry pavement...not to mention wet.   In all the MSD ignition more than paid for itself in gas savings the first year I had the S-10, EXT Cab and LS Sportside bed. I just sold it after having it 7 years.

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