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dreadman
Sweet on this forum
Joined: 20 Feb 2004
Tech posts: 277
My 2NRide:
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 Posted: Fri Jul 18, 2008 8:22 pm
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alyuh ever hear of this thing where you put a switch on 2 of ur injectors an cut dem off at cruising speeds..lol..i think i see dat a man in de states do this on a v6 to get sum economy..haha..them rell sufferin wit gas boi..but i wunder if that go work on a 4cylinder or if it aint go run atall
my padna had dis in his rx7 where he had a switch for 2 additional injectors in a 12a rotary |
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Advil
Sweet on this forum
Joined: 20 Jun 2005
Tech posts: 396
Location: Ahreeemah
My 2NRide: Nissan Almera
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Posted: Sat Jul 19, 2008 2:55 am
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| Hook wrote: | ^^^ isn't there a thread here on improving octane with home-made mixtures of toluene, methanol and whatnot? methinx it had recommended mixing ratios as well
either way, to some extent using nigher octane fuel MAY help fuel economy, but that depends heavily on the engine and tuning
let's say u have a high compression pocket-rocket and your timing is all advanced and whatnot...on pump gas it's likely to ping...so the knock sensor picks up the pinging and the ecu backs off the timing and richens the mixture to save your powerplant from pre-detonation
in a case like this, using a higher octane mix means your anti-knock circuitry doesn't come into play so u actually feel an increase in power (cuz ECU isn't pulling timing) and you get slightly better economy (cuz ECU isn't dumping fuel)
other than that, it doesn't help in a stock econo-box engine...just keep it well-tuned, properly maintaned and drive economically
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that extremely hard to do when yuh driving a 1.3 almera, and yuh hadda be at full throttle to reach cruising speed  |
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Hook
18 pounds of Boost
Joined: 18 Jan 2004
Tech posts: 2473
Location: fap fap fap fap fap fap fap fap fap fap fap *punch* ahhhhh...*exhales* TOIGHT!
My 2NRide: Toyota Corolla
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Posted: Sat Jul 19, 2008 7:35 am
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| so why u hadda try to reach "cruising speed" in a hurry? yuh losing d whole point of cruising when yuh do that...u know how many ppl I pissed off last night with my cruising? |
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cinco
TriniTuner WHOoRE
Joined: 06 Jan 2006
Tech posts: 1555
Location: talking to the voices in my head
My 2NRide: Toyota Corolla
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Posted: Sat Jul 19, 2008 2:59 pm
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| dreadman wrote: | alyuh ever hear of this thing where you put a switch on 2 of ur injectors an cut dem off at cruising speeds..lol..i think i see dat a man in de states do this on a v6 to get sum economy..haha..them rell sufferin wit gas boi..but i wunder if that go work on a 4cylinder or if it aint go run atall
my padna had dis in his rx7 where he had a switch for 2 additional injectors in a 12a rotary |
the 12a probably only had 2 injectors to start with by cutting off the next two he is running on the normal mix.
there are a lot of factors before you just cut out 2 injectors remember fuel is used for cooling in the cylinders also you would also need the spark to stop on those two cylinders because you will melt the piston and damage the valves without fuel cooling the system.
the cars with cylinder deactivation have a complex system which cuts the spark and fuel some of them also have a "floating" cam which does not even open the valves fully when the cylinder is deactivated. |
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