what size trottle body should i get?
Captain
Joined: Mar 2007
Posts: 632
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A change to a larger throttle body would not change the MPG of a vehicle that in daily driving has its throttle body more than 50% closed (throttled).
Learning what MAP (manifold absolute pressure) is and how it affects fuel economy and horsepower is routine for private pilots with gasoline engines, and all vehicle owners with gasoline engines would benefit from learning about it.
Part throttle operation is how your engine is operating more than 90% of the time on the road, even if you 'hammer it' at nearly every opportunity.
Learning what MAP (manifold absolute pressure) is and how it affects fuel economy and horsepower is routine for private pilots with gasoline engines, and all vehicle owners with gasoline engines would benefit from learning about it.
Part throttle operation is how your engine is operating more than 90% of the time on the road, even if you 'hammer it' at nearly every opportunity.
Things people sometimes forget:
1) Americans love affair with thier vehicles is nearly a century old.
2) Modding is a hobby, and like many hobbies, it does not make alot of practical sense.
3) Most of the mods we do have very little realeffect on daily driving. Agood percentage will have anill effect on daily driving as far as fuel economy is concerned. With respect to daily driving most of the
bolt ons have only a psychological effect.
4) Alot of guys really look forward to that 1% of the time, and want lots of air flow to make lots of hp
when they get to spend that time.
If you want a vehicle that is as close to 100% efficient as practically possible, then buy your choice of car or truck and leave it like it sits.
If you are one of the people listed in #4, then the Fastman or Hughes TBwould be a good choice.
50mm for the 318
1) Americans love affair with thier vehicles is nearly a century old.
2) Modding is a hobby, and like many hobbies, it does not make alot of practical sense.
3) Most of the mods we do have very little realeffect on daily driving. Agood percentage will have anill effect on daily driving as far as fuel economy is concerned. With respect to daily driving most of the
bolt ons have only a psychological effect.
4) Alot of guys really look forward to that 1% of the time, and want lots of air flow to make lots of hp
when they get to spend that time.
If you want a vehicle that is as close to 100% efficient as practically possible, then buy your choice of car or truck and leave it like it sits.
If you are one of the people listed in #4, then the Fastman or Hughes TBwould be a good choice.
50mm for the 318
These are good common sense comments. I believe the "psychological effect" is the biggest factor. There are some physical laws in this world related to the function of an engine and they apply the same to everyone.
Analogy: What if I say walking up stairs is easier than walking down stairs. Maybe I'm in good shape or I like the challenge or I just like going up. Doesn't matter, gravity causes walking up stairs to be more difficult than walking down and that applies to everyone.
But, I still "feel" better walking up. Does that make walking up better?
