Ok, pretty unsure how these work and when one is needed on a car if at all so would like a simpleish explanation if anyone is able

Im not all that confident in how one works so im not gonna embarass myself by explaining the way i think it does

can you tell if a car has one by the sound it makes when its open? i know it has its own branch on the manifold aswell, is it connected to anything else?

EXPLAIN

 

essentially, it goes on the exhaust manifold and a valve opens at a set pressure and lets exhaust gas out of a seperate pipe - whcih may or maynot be connected to the exhaust system, and this exiting exhaust gas does not go via the turbo and this keeps the speed of the turbo constant for the desired boost pressure/rpm of engine

thats a simple way of looking at it

 

lol cheeRS mate, that's explained the basics atleast!! so what happens to the existing wastegate etc? and how does it build up pressure when u'd think it'd just keep boosting with no actuator?

 

the external wastegate has an actuator of sorts - it controls the valve that vents xhaust gas

 

You use them on tubbys without an internal gate i.e tubbys that are designed to be used with an external gate.

pressure builds up and hits an adjustable spring this defines when it opens to let the exhaust gasses by pass the tubby

 

but how does the pressure build up if the tubby has no actuator and the revs keep rising and exh gasses flow? lol do these tubbys with no actuators have no wastegates i take it?

 

yes as i said before they have no internal gate

 

ok oop ssorry

 

ok...................now dont let it happen again

 

 

just out of intrest how much would this cost

 

depends on the car and what you are doing.

if you have an internal gate and arent running stupidly high power though you dont need one

 

whats the advantage then smoother more controlled boost?????????

 

the amount of gas you can flow is the main advantage

 

so what type of boost does a normal internal wastgate give up at, or is it not that simple say a -31 for eg

 

keep it commin

 

not that simple, its not about how much boost, its about how much excess gas you have to get rid of which is a lot to do with the turbo spec and rpm the engine is doing compared to how much boost you want.

on most engines, at full power, there would be little or no gas to flow anyway as the turbo would be barely coping with making the boost anyway.

 

PS

Nitrous is when they are REALLY useful, to avoid massive spurts of extra boost.

 

So are they really only needed with bigger cc engines that can rev high using large turbos? what size of turbo would u reccomend using one? or with nitrous/turbo cars ?