4agze Nearing completion, Street legal, & a few more vids/pics Options

[FAQdaWorld]

Well the swap is really close to being done now. I got someone to weld the rest of the exhaust up, its a little restrictive but I'll be getting all new exhaust once i go turbo.

I figured i'd post up a video for you gents to look at

I have the greddy cat back on there, and as you can see the celica MOVES!!!

Right click, save as

Whats left to be done:


Install front shocks (kyb gr2's)

FMIC

Hook Up power steering

Body shop to finish up the front.


Overall we should be done within the next week or two.

-FAQ

This post has been edited by FAQdaWorld: Jul 25, 2005 - 1:49 AM

[Coomer]

Jay, a 4A-GZE supercharger's boost is based strictly on RPM, since the supercharger is hooked to a belt that's hooked to the crank. The faster the crank spins, the faster the supercharger's internals go, producing more boost.

[jgreening]

Jay, a 4A-GZE supercharger's boost is based strictly on RPM, since the supercharger is hooked to a belt that's hooked to the crank. The faster the crank spins, the faster the supercharger's internals go, producing more boost.
[right][snapback]316817[/snapback][/right]

The part that I don't understand is that a turbo requires engine LOAD to create boost in the positive boost system. You can rev the engine higher and make more exhaust gases but the boost at idle remains very low.

It doesn't really make sense to me why a turbo (which simply reroutes pressurized exhaust gases back into the intake) requires engine load to create positive manifold pressure while a supercharger (which pushes ambient air into the intake through a simple compressor spun by the crank) does not. I would appreciate further explanation.

Edit: Here is my guess: I think the extra exhaust gasses at higher RPM's with a turbo are miniscule at idle compared to the exhaust gasses that are created when the engine is under load. In that regard, the turbo isn't really "pushing" the air very fast because the exhaust gases are not as plentiful while in neutral as they are when faster and hotter combustion is required to move the car. On the other hand, the supercharger simply uses RPM's to pressurize the system. It really doesn't make a difference if the engine has more load or not since the compressor is driven by the crank rather than turbine of the turbo.

This post has been edited by jgreening: Jul 25, 2005 - 11:59 PM

[WannabeGT4]

Jay, a 4A-GZE supercharger's boost is based strictly on RPM, since the supercharger is hooked to a belt that's hooked to the crank. The faster the crank spins, the faster the supercharger's internals go, producing more boost.
[right][snapback]316817[/snapback][/right]

The part that I don't understand is that a turbo requires engine LOAD to create boost in the positive boost system. You can rev the engine higher and make more exhaust gases but the boost at idle remains very low.

It doesn't really make sense to me why a turbo (which simply reroutes pressurized exhaust gases back into the intake) requires engine load to create positive manifold pressure while a supercharger (which pushes ambient air into the intake through a simple compressor spun by the crank) does not. I would appreciate further explanation.

Edit: Here is my guess: I think the extra exhaust gasses at higher RPM's with a turbo are miniscule at idle compared to the exhaust gasses that are created when the engine is under load. In that regard, the turbo isn't really "pushing" the air very fast because the exhaust gases are not as plentiful while in neutral as they are when faster and hotter combustion is required to move the car. On the other hand, the supercharger simply uses RPM's to pressurize the system. It really doesn't make a difference if the engine has more load or not since the compressor is driven by the crank rather than turbine of the turbo.
[right][snapback]316823[/snapback][/right]

The turbo doesn't reroute exhaust gasses into the intake. It uses the exhaust gasses to spin the exhaust turbine which is connected by a shaft to the compressor turbine. Super and turbo chargers both suck in and pressurize ambient air. Pressure is created when you're super/turbo charger is forcing more air into the intake than the engine requires. In neutral there is limited resistance to the flow of the intake charge therefore boost will not be generated as much. It is much more difficult to build boost with out resistance when using a turbo. But just like you guys said a Supercharger is driven by the crank which won't require the same type of resistance to build boost since the pulleys can be sized differently to allow for boost when the engine is not under load.

EDIT: Hope that makes sense now.

This post has been edited by WannabeGT4: Jul 26, 2005 - 10:59 AM