- #17 of 21
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Re: why i don't know [okko1]
by paisan
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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
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- #18 of 21
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Re: why i don't know [paisan]
by okko1
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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.
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- #19 of 21
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Re: why i don't know [okko1]
by Mr_Shiftright HOST
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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).
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- #20 of 21
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Re: why i don't know [Mr_Shiftright]
by paisan
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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
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- #21 of 21
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GM 4.3 HP Increase, MPG increase
by tc07
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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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