I just want everyones opinions.....
of what there benefits are....etc.

 

so under heavy lateral acceleration you dont starve the fuel pump and go boom.

 

so do you need to run a reserve pump in the surge tank?.... or does it get filled by the return line?

 

This is how it goes, from the tank to the surge, surge to the engine, engine to the surge, surge to the tank, that way by returning the fuel from the engine to the tank first, the tank will always be full.

 

so is a pump needed inside the surge tank?

 

bump for ya

 

Pump can be used in or out of the tank.

 

be careful when designing a surge tank setup... as in sustained high g turns you may even drain your surge tank, though this is not likely... it's entirely possible. example... skid pad testing... many an engine has popped during skid pad testing.

the tank size that astro showed is decent... you can go a little bigger and you can also get bigger lines but make sure that your pumps are doin' their jobs.

in case you're wondering what he was talkin' about at the end... you have an overflow line that feeds back into the gas tank... so the intank pump is ALWAYS feeding fuel into the surge tank... the overflow goes right back into the gas tank so. there's always pressure in the surge tank... this is what you want... so that the surge tank is always being filled and you won't just have fuel getting filled into it when you start losing it (although i don't think it's possible to make a setup the stupid way... cuz how would you stop the in tank pump?)

 

so it's mainly useful for autoX?

or is it beneficial/safer for drag racing as well....

 

actually maybe less useful for autocross... autrocross tracks are usuallly very tight and short duration turns. it's more useful for track racing... big and small tracks can have long sweepers that keep you pasted up against the door for a good while, when you're low on fuel... your car can have SERIOUS problem getting needed fuel. robi's frist engine got popped like this. the problem is more pronounced in the evo cuz of the saddle shape of the gas tank... but is a problem for all serious racers.

 

anyone have a surge tank diagram?....with an inlune pump?

 

you basically can hack it out from the description that came with the picture.

you have a line from the surge tank to the pump that goes under the back seat. that pump delivers to the engine.
then you have a line coming from the engine back to the surge tank.

completely seperate from those lines is the feeding system...

you get your in tank pump to fee into the surge tank and then you get a return line from the surge tank back into the fuel tank.

basically two seperate systems... one for filling the surge tank and one for taking from it.

btw... that surge tank that you see there... i think that is a bad design... cuz the line that goes out to the pump that goes to the engine should be on the bottom of the tank... otherwise that defeats the purpose

unless he has a straw going to the bottom or something... btw... you usually have multiple lines for some of the to/from things described above.

and gt40 has a nice setup... maybe ask him.

 

Here is a diagram of the setup you are requesting.

http://toyotaperformance.com/images/fuelsys.gif

 

sweet

 

Anyone else have surge tanks?