look at the wastegate can....if it faces the front of the car you have a Garrett T-3

if it faces the right front tire you have a KKK.

I still beg to differ. If the rubber hose leading to the actuator is broken or cracked almost all or most of the boost would be lost through the cracked/broken hose.

through a 1/4 inch hole? No its not. you will lose a little but not much, take a look at the CFM rating at 15 psi boost or 20 even....tell me how you are going to get that out of a 1/4 hole at that boost level and you will see my point.

Plus don't believe me yet..hook up a boost guage to your car...pull off and disable your overboost switch if its not already. take off your wastegate hose...floor it for even 200 feet out the road and report back what your boost guage reads....I promise you its over 20 psi...

The switchover valve could be taken apart and cleaned as a temporary measure. There is a pointed rubber piston in the valve that could get stuck with crud coming from the intake manifold. At +-20 yrs old, it could get really dirty inside. Just vwondering if a prefilter would be a good idea for that valve?

A redundant or backup system, perhaps. But not failsafe. A failsafe system fails to the safe mode. The switchover valve doe not do that.

true....a real failsafe would work the opposite as it actually does, with the system holding open the boost to the alda with high boost cutting power and it venting as a base mode.

All in a choice of words.

Hey,

I can tell you from personal experience that if the wastegate hose is disconnected from the wastegate and left OPEN TO AIR on the other end, it will overboost like no tomorrow.

Sure you loose some bottom end boost but after 3-3500RPM the turbo will easily overboost the engine until it starts to fall off due to the useage from the engine at, for example, 5krpm.

Forgot to hook mine up one night after doing some mods, and noticed that I was getting 21-22psi boost when normally my boost controller/stuff keeps it at 14-14.5psi. So I just massaged it home and kept it in the 12-13 range.

BTW on a stock car, you don't get benifits from going from 11psi to say, 14 or 15psi (as bhd said) however if you pump is modded...the extra psi is VERY useful and almost necessarily with a certain amount of fuel :)

Also it can affect air charge temps on a non-intercooled car and cause excess heat production. If you have an intercooler...extra boost can sometimes do good things :)

Ah! I stand corrected. I was ignorant to the system. I see now how the whole thing works. I was under the false assumption that the boost is actually bled off through this hose.

never assume it makes an ASS out of U and ME