I was wondering what was the most whp any has made on either of these two wastegates.

I know what each one is supposed support a certin amount, but i have seen 497 out of a 35mm, so i must not be understanding this correctly. I thought that the more psi you push the less the gate has to bleed out and the more it retains to push the turbine.
so what will be the benifit of a 40mm over a 38mm.

all comments are welcome, keep in mind that i'm trying to gain knowledge.
thanks in advance.

 

someone please explain, i am curious myself

 

in theory..the less boost you run the bigger you WG should be... because it has to hold back more boost in a sense. if you are running thirty pounds then your wg could be crap and small because it holds back barely anything. make sense?

 

That's actually incorrect. The TiAL website is wrong, depending on how you intirprit what it's saying. When you first think about it, that theory seems correct. But think about this: The more boost you run, the more air goes into your engine, and whats the biproduct? More exhaust gasses. Basically you need to run a good sized wastegate no matter the scenario. Engine size, turbine size, boost, and many other factors go into sizing your wastegate, it's definitely not an easy science, and I won't admit i even begin to know how it works.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Unsung EM1 &raquo;</TD></TR><TR><TD CLASS="quote"> Basically you need to run a good sized wastegate no matter the scenario. Engine size, turbine size, boost, and many other factors go into sizing your wastegate.</TD></TR></TABLE>

the major thing with the larger gate is that it is more accurate a metering boost so you have steady boost

 

so if thats the case you could use a 35mm gate to hit 600whp but it won't be as accurate, is that correct?

where are the turbo gods???!!!!!!

 

If the outlet on the wastegate is too small it won't be able to vent out enough exhaust gases; you will get boost spike over the spring rating.. The more efficient turbine wheel/turbine housing combination you run; the bigger the wastegate you will need.

On a T3 .63 stage 5 combo you could probably get away w/ a 35mm gate even at close to 600whp. This is because you will be using almost all that exhaust gas to power the turbo. However, if your making the same power w/ a T4 .68 and P-trim, your going to have alot less back pressure so your going to need to vent more exhaust gases out the wastegate; hence you will need the larger gate.

This is also why you see some of the pros running dual wastegates these days; they are getting so crazy w/ the turbine side that even the big 60mm gates can't dump off enough.

 

perfect , so if i was going to run a sc61 76trim with .63a/r up to or a little passed 500whp will a 38mm be enouph or will it spike badly(enouph to upgrade to a 40mm)

 

38mm will work fine on for that combo. I actually don't know of any street cars who have had any problems caused by wastegate sizing. Its usually cause from manifold design. hehe