what is the best to have (internal or external)? i have the incon bb37 in serious consideration for the BBDET. it has an internal wastegate. what is better for high boost applications?
most of the high boost cars ive seen use external gates. the machine work on the tial wg's is excellent. IMO i also think its easier to fab dump tubes from an external gate.
the only problem with ext wastegates are the sound they make, they sound like crap. But all the pros and big guns use them. I think if you are going to run high boost levels 20psi or like 1.5bar and up go ext.
Originally posted by myoung Depends on what motor you're working with....
ive pretty much settled on Incon BB37 on the BBDET with JWT s3 or s4 cams. prob. running high boost. bearly any racing. no autocrossing. just a street driver. would the incon (w/ int. W.G.) be good for this application?
internal gates can creep....but so can external gates that are positioned incorrectly. run the internal gate to begin with. if u experience problems with creep....buy an external gate. then u have to modify the exhaust manifold and turbine housing to accept it.
FWIW, i ran a t25bb with the external gate and didnt really run into any creep.....even with a less than ideal angle for the downpipe. i did have the wastegate and turbine exit ports separated at the flange, that helped a little.
I'm thinking about that bb37 as well. I think I'm gonna get it from JGY when they do my swap. My goal is 350hp (at high boost, only really for dyno runs). I'm definately doing electronic boost control, but I never thought an internal w.g. would be a problem. What to do, what to do........
Originally posted by 1997 GA16DE I'm thinking about that bb37 as well. I think I'm gonna get it from JGY when they do my swap. My goal is 350hp (at high boost, only really for dyno runs). I'm definately doing electronic boost control, but I never thought an internal w.g. would be a problem. What to do, what to do........
If money is an issue, yeah! But if you have the bread to take care of that right now instead of paying someone to go back and do it later, then I would say do the external thing the first time.
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You must pay to play! Boost ain't cheap! {x2 B12 Sentras with CA18DET engines}.
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