1st gear not fast

[TachyonS14]

do you rev to 6.5k or 7k? I think in first for me its like 30, just like a 350z :-)

[Zydeco]

Your car is also kind of heavy so that not realy going to help you eather.

[SilviaS14KA24DE]

i'm not talking about adding power but quickening acceleration

[Zydeco]

you mean "freeing up" power. if thats the case i cant realy help

[Shawn Clark]

Don't know about the '95's, but the previous engines had "tip in retard" that would cause the car to bog when you punch it from idle. As best I recall the timing is retarded by 8 degrees for ~1/4 sec in certain situations (going from idle to high throttle opening). I got this info from Clark Steppler at Wolf many years ago who said it was an anti-detonation measure from the old days of Nissan fuel injection. That was one of the things the Wolf chip removed. It was very noticeable when I made the swap.

With the 240SX you need to keep the car in the power band starting at about 3500 rpm if you want good acceleration.

[Looneybomber]

removing the gas cap only will depressurize it so not a lot of gas will come out when you pull the hoses. When you get gas and take off the cap, you should hear it depressurize

Explain this one to me. Your gas tank is pressurized? Hows that, is there an airpump pressurizing it? To my knowledge gas tanks rnt pressurized, they r open to the air to equalize out the pressure. If they were 100% sealed, then as u sucked out gas it would create a suction inside the tank, making it harder and harder for the fuel pump to pull gas from the tank, eventually restricting the amount of flow causing u to lose HP. Follow me?

Silvia, if u really want something that has a tall first gear and is fast, check out the new yamaha R1's. Can u say 106mph in 1st at redline?

[Chingon]

Explain this one to me. Your gas tank is pressurized? Hows that, is there an airpump pressurizing it? To my knowledge gas tanks rnt pressurized, they r open to the air to equalize out the pressure. If they were 100% sealed, then as u sucked out gas it would create a suction inside the tank, making it harder and harder for the fuel pump to pull gas from the tank, eventually restricting the amount of flow causing u to lose HP. Follow me?

Silvia, if u really want something that has a tall first gear and is fast, check out the new yamaha R1's. Can u say 106mph in 1st at redline?

I don't know about that..., if the tank was vented as you say...then the gasoline vapors would be ignited by the nearest flame source (gasoline vapors are very volatile and flamable) I think that w/heat the gasoline evaporates, causing pressure on the tank and it condensates and turns liquid when temperatures go down. Also there's a sign on the gas tank cap that says "open slowly, gasoline may be under pressure"...if that's not a dead giveaway, then the pssss sound when opening your gas tank is enough proof for me.

[SilviaS14KA24DE]

yeah exactly, if you don't hear the either short or long "pssh" sound, then somethings wrong.

[Looneybomber]

I dont have a "open slowly, gasoline may be under pressure" on my gas cap, and it never Psss when i unscrew it. I do know however that I have a vent tube comming out of my tank, and a vent hole at the top of my gas cap on my motorcycle, and since the gas tank is in your crotch i would think deaths would be high if it exploded which ive yet to see a case of that happening.

Yes as the tank is heated, the air inside will expand, but as it cools it will contract and create a suction if sealed. So in the cool mornings when u start your car there should be a big suction as the air has cooled and u have not displaced the gas u burnt the day before driving, creating a larger suction. So tell me, if the tank is going from totally full, to totally empty, and it's sealed, how is the gas being replaced by air, enough so to actually create pressure inside?

[Toms240420]

someone told me that 1st gear is governed, is that true

[Chingon]

Now that I think about how volume and gas works, what you say makes sense. Say you have an empty tank and fill it up w/gasoline. This gasoline will displace any air that may be in the tank to the outside through the filling hole. Now as the tank empties (if the system was sealed), the ambient pressure would crush the tank due to the pressure loss inside of it. The only way would be to equalize both pressures somehow.

To make a sealed tank work, there would be a set amount of air inside the tank already which equals to the ambient pressure when empty. This air would compress with the addition of fuel and start decompressing as fuel was deminished. Keep in mind that this air would not be able to escape for this system to work. Something impossible due to the filler hole.

The more I think about it, there has to be a hole in the system. Big enough to allow pressure equality yet small enough as to not lose fuel gas or fuel in liquid form...

[Looneybomber]

The ones ive seen have the vent holes at the top of the tank. And maybe there is a splash guard around the hole to keep liquid from sloshing in it. Now it could be possible to have it sealed, but like i said in my first post "Hows that, is there an airpump pressurizing it?" That would just be another superfulous electrical system to potentially go out and cause a headache for the owner

[SilviaS14KA24DE]

yeah sounds good

so is first gear really goverend?

[IvoryJ30t]

gas caps allow air to enter the tank, but not escape. thats why the tank does not build up vacuum as the gas gets consumed.

the cap does not allow pressure to escape. built up pressure gets routed to the carbon canister so that the raw fuel vapors are not vented to atmosphere [emissions crap].

[Chingon]

That kinda makes sens ivory, but upon closer inspection of my gas cap, I don't understand how it lets air in....is it through the "screw" threads? 'cuz i did not see any holes on it.