Hey guys so, I'm going turbo and I'm for for a precision 6262 or 57 trim... Not sure yet, but can someone explain to me what is better if to go with internal wastegate or external? and what is the difference ? Thanks....

 

and my plans are to make 300-400 hp

 

I have run both setups I love them both! However, my exhaust housing on my internal tend to crack around the flapper. I also had friends whose flappers had cracks in them. I kept running mine because it really didn't affect anything performance wise but eventually it came down to a rebuild. I sent it in for a rebuild and had to buy a new exhaust housing I ended up going with external at that point.

Some argue that internal is better in the Scoob world but for me both worked to extract HP. In the end it's your baby your work that defines you. I tend to love external wastegates, easy to change spring rates and a simple change out.

 

so, it really doesnt matter besides that the internal tend to crack around the flapper?
and on the external there isnt no cons?

 

Agree with brownie 100% thats about the jist of it. Externals are the way too go for better boost control combined with a boost controller either electric or manual. Easier access and maintenance if needs be.

And if your like me there's nothing like hearing a waste-gate open or dump fire from the open dump tube under decent PSI. Hmmm boost luv it.

 

Sure you could probably find cons if you looked for them. Wastegates take space you need a dump tube, divorced or married piping etc. Also, a big one may be a possible two extra gaskets. I did a buick regal once without any gaskets and just copper spray between the turbo, downpipe & wastegate (I'm not telling you to do this either). It held better than with the gaskets. Granted we had everything milled flat before hand.

Usually if your aftermarket you will go strait to an external wastegate. Stock force induced cars usually come with internals for convience and cost. Most stocks will opt for a bigger turbo with internal for a quick bolt on. Changing to external means more money for the setup and more time getting it all together. Like I said before, it can be a "con" but all depends on how you look at it. Preference is also a big one with wastegates too. Some argue advantages over the other I personally don't care as long as it gets the job done right.

 

ive seen externals make more hp than internal with the same mods

 

I talk to precision today and they told me that the precision 5857 internal wastegate is good enough for what I want and as a daily driver..

 

Oh, hmmm never heard that one.. although i've heard that externals are better for high hp