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john
03-09-2005, 10:06 AM
I am guess you need to "waste" the exhaust, so my question is pretty damn stupid.

Yes it is. The wastegate can be installed on the exhaust manifold or it can be installed on the O2 housing. I ran mine off the O2 hosuing but have also ran one off the #1 runner. Both worked fine for me. As far as wastegates are concerned, I ran a tail 38 in my car and a HK$ wastegate in my brothers. They both worked fine. Ryan is right.

The size is the difference. You choose the spring to set the boost you want to run (ofcourse you would change it with a mbc). You will have to think about what boost you are going to run before buying a wastegate. You want to select a spring that is not too strong or too weak. If you get one too strong, it will never open when you want it. If you get one too weak, you run the risk of it opening too early if you choose to run a boost level well above it. If you wanted to run a minimum of 15psi, get one in that range (~1 bar).

JET
03-09-2005, 10:57 AM
On the TiAL's there is also a material difference between the 38mm and 40mm. The 38mm is their basic, price leader model. The 40mm works better with race gas, which turbovan runs, so I would go with a 40mm.

john
03-09-2005, 02:03 PM
From what I remember when I was purchassing one, there is an option for a different valve which is supposedly better on race gas (atleast on the 38mms). I remember talking to CVD at school about it one time. I did not get it. I bought the cheaper one. I do not have time to search now though. The obvious difference between them is the size and the flanges are different.

Goat Blower
03-11-2005, 04:23 PM
I don't know what race gas would have to do with a wastegate except to match the spring to the boost level you're running, the EGT on the wastegate valve is going to be about the same.

JET
03-11-2005, 04:33 PM
The diaphram in there used to be made out of a different material. I see the diaphrams are now the same on all the models, but the valve is not made out of the same stuff on the 38mm.

john
03-11-2005, 09:49 PM
I am pretty sure it is/was an option. Not worth arguing about though. I did not see it as a problem as why I went with the standard one.