turbo question

[driftking777]

what do you guys think is a better turbo a internal wastegate or external wastegate? also whats a good BOV to buy?

[RazorGTR]

Depends on the applications for both. As far as a blow off valve, you can't go wrong with a Trust Type R, though a bit expensive.

[Jonas427]

It's all a balance between economics and performance. The nod on economics goes to the integral style. The performance advantage, while small, is usually with the remote wastegate. Show me an integral wastegate on a race car.

[CrashGordon]

I tend to think that an internal wastegated turbo is the most reliable alternative for a street driven car. It does not have near as many issues with plumbing, or exhaust leaks. It does however pose some packaging issues, and it does restrict the exhaust a little bit.

For performance, i do see some advantages to an external wastegate. As long as the car is not driven on the streets, the wastegate can be dumped into the atmospher (although that sounds horrible). It also allows you to tune the exact position that the regulated exhaust re-enters the downpipe. If you put the wastegate merge tube at an angle offset in the pipe, it will not cause much restriction in the exhaust. It actually causes a swirl effect, which flows quite well. I had a really long conversation with Bob at JWT about this and he said that with the dump correctly positioned in the downpipe that there were very little to no restrictions applied to the already flowing exhaust gasses.

But my personal choice is still an internal wastegate...

[CrashGordon]

We are doing a turbo s2k right now, and due to space we had to run an external wastegate. Once its done, I am sure that I will have to take the wastegate off at least once due to a leak. We had a 2000 prelude that we turbo'd and we had to machine all the surfaces in order for it to seal properly. I have found that the turbonetics gasket for their deltagate works best with the Tial unit. It is a metal impregnated gasket, and doesnt burn out like the Tial gasket.

[RazorGTR]

Ok simply put larger turbos without an internal wastegate are made that way specificly due to the lack of being able to relieve the extra flow they produce. There is nothing wrong with either as long as the external is set up properly. Unknowledgable people say the same things that are said in here. While yes it does add to the pluming for an external you don't have a choice when using a non-internal wastegated turbo. A lot of places don't like messing with them for street use due to the nature of setting them up right can be time consuming.

What is a waste of time is turning an internal wasted turbo into one with an external. There is absolutely no gains to be made at all.

[CrashGordon]

"Unknowledgable people say the same things that are said in here"

I dont understand where you are going with this comment. I have built many turbo systems from the ground up, and I was simply conveying experiennces that I have had. I would hardly consider myself Unknowledgable. I have 4 cars sitting in my shop right now that are getting custom turbo setups installed, and we design the kits for street aplications.

Have I somehow rubbed you the wrong way?? If so , I am sorry.