Sup w/them 2024 Summer Projects?
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Kevin. (Jun 14, 2021)
Jun 14, 2021, 09:13 AM
#3257
EvoM Guru
iTrader: (1)
MVR Wastegate spring question -- I put the 1 bar spring combo in one of the 44mm Tial MVR wategates and on a bench test the valve barely cracks open at about 23 psi (fully open at at about 28 psi). I found an old post on EvoM with Tial saying this is normal and explained by the lack of exhaust pressure on the valve, but I'm really skeptical and suspect this is going to result in wastegate pressure being over 20 psi, when I want it to be more like 14.5 psi (at least for starters). Since it's a pain to change springs once everything is installed, I'm hoping to get this right on the first try, or at least underboost rather than over. Any suggestions?
EDIT: Just saw this on Turbosmarts’s site: Although you can perform a “bench test” of a wastegate to confirm that it is cycling properly and not seized, this bench test will not offer accurate results in regards to the amount of air required to open the wastegate. It is important to keep in mind during this test that when the wastegate is actually run on the vehicle, there will be additional exhaust backpressure helping to force the wastegate open. Because of this, a 14 PSI wastegate may require 20+ PSI or air pressure to open during a bench test. The best way to confirm the proper operation of a wastegate is to run it on a vehicle.
6/13 EDIT : I reduced the spring pressure by 20% so it cracks at 16-17 psi and opens significantly at 20 psi. Hopefully, that works out okay.
EDIT: Just saw this on Turbosmarts’s site: Although you can perform a “bench test” of a wastegate to confirm that it is cycling properly and not seized, this bench test will not offer accurate results in regards to the amount of air required to open the wastegate. It is important to keep in mind during this test that when the wastegate is actually run on the vehicle, there will be additional exhaust backpressure helping to force the wastegate open. Because of this, a 14 PSI wastegate may require 20+ PSI or air pressure to open during a bench test. The best way to confirm the proper operation of a wastegate is to run it on a vehicle.
6/13 EDIT : I reduced the spring pressure by 20% so it cracks at 16-17 psi and opens significantly at 20 psi. Hopefully, that works out okay.
Because then the intake tube would have to go through the P/S pump.
Jun 14, 2021, 09:29 AM
#3258
You'd have to move the power steering reservoir and the coolant overflow to fit the air filter. The exhaust would end up awkward still too and would require a pretty tight radius bend. Stuff like this is why I'm happy to stick with the stock frame stuff, keeps life simple.
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kaj (Jun 14, 2021)
Jun 14, 2021, 12:25 PM
#3259
EvoM Guru
i used to have my gate water cooled but found it a pain in the *** and a point of failure so removed the water lines and havnt looked back. ive never had an issue on track with the wastegate getting too hot.
Jun 14, 2021, 03:08 PM
#3261
You'd have to move the power steering reservoir and the coolant overflow to fit the air filter. The exhaust would end up awkward still too and would require a pretty tight radius bend. Stuff like this is why I'm happy to stick with the stock frame stuff, keeps life simple.
Jun 14, 2021, 05:31 PM
#3263
I’m not going to worry about the water lines for now. I’m sure it’s okay for initial wastegate spring testing and initial tuning. I do plan to add it because the gate on the right side is so close to the header tubes. The motorsport MVS with the extra heat sink doesn’t fit as you said. I asked Morrison about that gate. They got one on loan from Tial for me, but weren’t able to make it work without compromising the wastegate inlet angle on the passenger side. I do have twin MVRs, not MVSs — Morrison’s recommendation based on my desire to be able to really turn down the boost.
Jun 14, 2021, 06:38 PM
#3264
When you ask yourself the question:
If a shop developed a kit like that then how many units could they produce and sell?
Jun 14, 2021, 07:35 PM
#3266
Wastegates only need water cooling if they're stuff in an area surrounded by exhaust heat and have little airflow going over them. The left gate may need it. A good indicator if water cooling is needed is if the anodizing on the top of the wastegate starts to fade fast.
Jun 15, 2021, 07:08 AM
#3268
Looking through some of the finer details of putting together my next engine and where I want bearing clearances to be. Trying to determine if I want to move from Amsoil Dominator 15w50 to Dominator 10w30. The 15w50 is some pretty thick stuff and I'm concerned some of the bearing wear I saw on my last tear down a couple years ago was from insufficient flow on cold starts.
Jun 15, 2021, 10:09 AM
#3269
Eh, the DOM 15 feels a bit thin for a 50 weight category oil to begin with which I liked due to the reasons you stated, it's not like honey you get on vr1 or the like. In motorsport conditions I'd rather a 50 back down to a 40 then a 30 back down to a 20 when the heat comes in. Even though I am running a oem block.
