werwuryoantenaz

why do ppl take out the smog pump on the fc3s 2nd gen only.......how will you maintain your 2nd gen to keep it in tip top condition.....wwhy you pre-mixes

i bought mine with no smog pump and other smog equipment.....never really thought of why do ppl like theirz off......
does it make your car faster?
is it good for the car and the engine?

enlighten me>>>>hahah

amishboy

https://www.rx7club.com/forum/showth...hreadid=112251

werwuryoantenaz

thank you very much...and for the record i WILL shoot back...

Aaron Cake

iTrader: (1)

Actually, I think this is a great question.

Regarding the smog pump, there are a few reasons. The most usual is that they have upgraded to a set of headers and an open exhaust. Since this eliminates the cats, there is no longer a reason to run the air pump. So it is removed.

Another reason is to fit a decently large turbo. The air pump takes up the space you would use for a large compressor and inlet duct. This is the reason that my air pump is gone.

The third is because they are under the false assumption that removing the air pump will somehow make their car faster and/or give them more power. This is totally not the case. True, the air pump does weigh a few pounds (must be less then 10), and true, it does take a little power to run (maybe 1HP at the most). But removal is insignificant compared to almost anything else you can do. And in the case of the S5 NA, the air pump is used to operate the 5th adn 6th ports and VDI actuator. So if you remove it, you must figure out an alternative way to run those actuators. Normally this involves a small electric pump (adding back the weight) or wiring them open (massivly hurts low end, no gain over properly working). And of course, air pump removal means you must run a dual alternator belt so the water pump will still spin, or convert to an electric fan (a whole other can of worms).

Regarding premix, some people believe that it lubricates better then the metering oil pump that Mazda installed from the factory. My opinion is that it's 6 of one, half a dozen of the other, and that there's absolutely no point in removing a perfectly functioning metering oil system in favour of having the hassle and expense of dumping 2 stroke oil into the tank. There's really no scientific proof that premix is any better.

This is an interesting topic, because it goes to show that the new owner of the car that has these "mods" done to it might not be too thrilled about them...

Gene

iTrader: (1)

I'm pretty sure there is scientific proof. When you pre-mix, you use two-stroke oil, which is designed to burn and leaves little/no residue. With the stock system, you're using dirty crankcase oil, which is designed not to burn, and leaves behind nasty stuff when it does.

The other benefit to using pre-mix is that you don't have to worry about your OMP failing and taking out your engine.

That said, it's a pain in the *** and I don't recommend it for everyone. I do it myself, but my car is a track/weekend fun machine, not a commuter car that gets used every day.

Aaron Cake

iTrader: (1)

Let's not get into this. Until someone shows me a scientific study, carried out in controlled conditions with NEW engines as test and control, I'm not convinced. Partly because there are many, many high mileage RX-7s on the road with their original engines, most without the "benefit" of premix.

amishboy

Thats a good thread I got it in my favorites.

Gene

iTrader: (1)

Fair enough.