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Increasing Horsepower/Torque/MPG

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

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What is this discussion about? Performance Mods


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#16 of 21
why i don't know by okko1
Aug 16, 2007 (4:30 pm)
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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
#17 of 21
Re: why i don't know [okko1] by paisan
Aug 16, 2007 (5:21 pm)
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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
#18 of 21
Re: why i don't know [paisan] by okko1
Aug 19, 2007 (3:28 pm)
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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.
#19 of 21
Re: why i don't know [okko1] by Mr_Shiftright HOST
Aug 19, 2007 (5:45 pm)
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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).
#20 of 21
Re: why i don't know [Mr_Shiftright] by paisan
Aug 19, 2007 (7:56 pm)
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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)
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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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