spoolinvtec54

whats the differents between 38mm and 44mm tial wastegate.

i have ls/vtec darton sleeve 84mm cp piston, bisi rods, delta 272 cams, bisi valve train and turbonetics turbo.

94VTEC2TONE

44 is going to prevent more boost creep, if you have a ramhorn usually its good to run 44mm

TheShodan

iTrader: (14)

That is dependant on the size of the turbo used as well as the boost pressure that you plan to utilize. anything that is lower pressue levels below 20psi for anything 58lbs/min or more would be best fitted with a 44mm. If just using your average 49-55lbs/min, and using under 20psi of pressure, the 38mm will do fine.

It depends upon what you have. List that, and everyone can be more precise in their answer.

spoolinvtec54

The Turbo is a Turbonetics T3/T4B Hybrid Ceramic Ballbearing Turbo consisting of a T3 Stage III trim turbine section, and a T04B compressor section with .63 ratio. The T3/T4 HYBRID offers the low inertia and fast boost response of the light weight T3 turbine wheel and the high airflow characteristics of the T4 compressor family. The TURBONETICS CERAMIC BALL-BEARING T3/T4 HYBRID series.

darkvader0

Lol... You'll be fine with 38mm

TheShodan

iTrader: (14)

based upon this information (though it does not give a compressor wheel measurement at all) it can only be inferred that the turbo flows less than 60lbs/min, in which case, assuming that the manifold has its wastegate placement in a proper location, a 38mm should do well enough.

spoolinvtec54

heres my manifold

TiAL

that's probably not going to control anything less than 1.5 bar unless your backpressure is through the roof

spoolinvtec54

my turbo

spoolinvtec54

so ill need a 44mm wastegate.

TiAL

no, you need a manifold that gives some priority to the wastegate

spoolinvtec54

do you have any pics on manifold that gives some pirority to the wastegate.

kyden

you're gonna have to get a 38mm with that manifold, or have the elbow cut off and a 44mm flange welded on.

spoolinvtec54

it has a 38mm

TiAL

this is pretty much perfect

Tjabo

Perfect, and perfectly horrible?

So is there anyway to reconcile the wastegate manufacturer's desire for complete wastegate priority with the engine builder's desire to have a design that provides optimum max power through total turbine priority? I've seen some designs that have a nice flow path to the turbine housing, and also have a nice shallow angle of divergence to the wastegate. Would that be a nice compromise?

crashtke

As stated above, it really just depends on the turbo you plan on running and the boost you plan on running. But honestly the difference between the 38mm and the 44mm is not a lot. I like the 38 as it is easier to package in tight places and flows just fine.

SovXietday

And I thought with all of the manifolds you've seen you'd have a collection of pristine perfect manifolds to show off. That thing is ugry!