new wastegate

[kelvinb]

i hope its loud ;)

[1990EclipseGSX]

Pretty. Is that a 60mm?

[kelvinb]

yes, with a 1.04bar spring.

[MidnightTSI]

I bet it's got an angry sounding loud roar to it :D

[420ASlowness]

Thats pretty, congrats! Ill bet its pretty loud as well

[Mirage]

What size turbo is this regulating and how low of boost are you wanting to run?

Marcus

[wazzelby]

Man, that's huge! Are you trying to run a 4094 at 5 PSI?

[v413nc3]

LOL! I bet my 4094 would surge like mad at that low of boost.

[kelvinb]

so the high horsepower cars and LMP cars are running low boost?

[v413nc3]

I can only speak for a few high horsepower cars on here, but I know I ran 42 and as high as 49 when my turbo catostrophically decided to leave this world. And plan to run 45ish on the 4094.

[fusionsport]

Kelvin what they are getting at is the only reason you ever need a larger wastegate-or two wastegates for that matter- is when you have a monstrous turbo and are wanting to try and run low boost levels.FOr whatever reason people seem to equate a larger wastegate with the ability to handle more boost, but thasts not really correct. Too large a gate can actually hamper boost control because the exhuast packpressure has more area to work against requiring more effort to keep the vlave closed under high power levels. Too large a gate and the boost control becomes a bit like an on-off switch because the smallest amount of opening results in massive flow through it, much like a 3"throttle body on a 2-litre can make the throttle feel overly sensitive. Many manual and some electronic coost controllers will have trouble dealing with this sensitiity leading many users to very very wrong conclusions regarding thier boost control.
A lot of the big-wastegate stuff is a carry over from the Honda drag race guys since to get traction off the line they have to run thier GTK 850's or similar at super-low boost levels to get off the line without killing the tires. A typical Hot-Rod class car for example is typically using a very powerful boost controller to help in dialing power in and out throughout its run to keep traction to get a good time. The same thing applies for an LMP car. A typical VW 1.8 LMP engine for example is capable of over 850whp. The problem with that much power in a car that turns is wheelspin on corner exit which leads to poor laptimes and too much tire wear. When you see an LMP engineer with his laptop connected to the car, chances are hes dialing out power in specific parts of the track to minimize wheelspin on corner exit to get better laptimes. Using a large wastegate allows them to fine-tune the boost for specific parts of the track, even if they have to limit boost to 1/3 of the power they normally would run.

I personally ran a Turbosmart 35mm gate on the SC61 and was able to run that turbo as low as 13lbs.