hmmm...more air???

[norcal-nonturbo]

ok for some reason this just popped into my head and i was wondering about peoples opinions on it:
ok if im not mistaken our cars run borderline pig-rich and therefore (if im correct) we have a lot of room to lean out the mixture. However we are faced with the problem of not being able to hack much of a MAS because we are lacking the lower chamber (at least the 91s are). what i was trying to figure out was an adjustable unregistered air inlet so that you can lean out the mixture without the chance of leaning it too far out. what i was thinking was making a metal intake pipe with some sort of valve on it to let in unregistered air in to lean out the mix. you would of course need an AFR gauge to keep an eye on the mixture but do you think that this would work? and if so what kind of power are you looking to net? i know that there are a lot of things that i have not thought of so please bring them to my attention because this makes sense to me. on to my questions about it:

Would the car even run with a sizeable amount of unregestered air?
How much power can be netted by something like this?
How much could i get with bigger injectors? im not sure on the size but i think that 2.0l n/t injectors would work to bump the fuel flow.
What would you use for a valve? i have my ideas but what are yours and how big would it have to be to be useful?


this is the result of thinking...i dont know if its a good thing but its sure interesting.

-Jeff

[fast1.8sohcDSM]

If you want to lean out your fuel mixture, why not buy an Air/Fuel Mixture controller? And if you want to lean it out even worse, hack your MAS.

[HARTS]

Originally posted by fast1.8sohcDSM
If you want to lean out your fuel mixture, why not buy an Air/Fuel Mixture controller? And if you want to lean it out even worse, hack your MAS.

Oh you mean an safc, a good reason why not is cause it's $300. And he just said there isn't much to hack on the 91.

norcal- nonturbo: I like your idea, but I don't think it would work for the simple fact that we cannot use a 2g mas on the 1g without bigger injectors. I also don't think there would be any noticeable performance gain worth the risk of damaging your engine. Plus the car would definately idle like shit.

[fast1.8sohcDSM]

Hey, that is the price of tuning, you want to tune your car, you need to spend the money on the hardware that can do it.

[norcal-nonturbo]

ok my idea is not to lean my car to the point of detonation, but to lean it out a little bit for a better A/F ratio. it would help mileage and a little bit of performance. as for the s-AFC, this idea was more or less a inexpensive alternative to the AFC, i know that those are really the only way to tune your car but what i was thinking is that i can do some tuning with an AF gauge and a valve that i open and close on the intake tube. like i said i am not looking to get a whole lot of air into the mix just a little punch. i thought about the 2g MAS problem with having to run bigger injectors, i think that this mod will let in far less air than the 2g MAS so i think that i am on ok the injectors and if im not then i can just switch to the 2.0l injectors.

-Jeff

[HARTS]

There would be no noticeable difference. Putting a hole between the filter and intake manifold would be like pulling off a vacuum line. Pull off a vacuum line and see if it makes a difference.

[ginsu417]

Using a hacksaw, you can slowly trim the end off the bypass tubes to lean out the mixture. You probably won't see much performance increase, but it is definitely less restrictive. Hope you have an A/F gauge at least.

I like your idea, but I don't think it would work for the simple fact that we cannot use a 2g mas on the 1g without bigger injectors. I also don't think there would be any noticeable performance gain worth the risk of damaging your engine. Plus the car would definately idle like shit.

You can let it ping till the motor stalls and you still won't damage a 1.8L SOHC N/T motor by starving it of fuel. You need more than 9:1 compression to damage a motor from detonation. If you listen to most toyotas that are more than 8 years old, you'll see that they knock constantly.

- K