I have a quick q. I have a 6.0 with the sts i was wondering if the 38mm wg that comes with it is suffiecent enough. The turbo is the 60 the base one. cause right now i have a small green wg spring rated for 7psi and its makin 13 psi. Do i need to reference it off of the manifold versus the port on the turbo? I took the wg apart and made sure it was workin properly spring is in correct and not binding. or is it due to bein a small turbo??


Thanks!!!!

 

assuming we're talking external gates.

38mm should be good. thats what i got.

based on what kind of boost you want to run, you can rebuild your WG with different rate springs.

your WG should get the boost ref. from the turbo. as shown below



based on what rate spring is in your WG, the spring can control 2x the listed rate. (with a boost controller)

for instance, if your spring's rate is 9psi. then without any boost plumbing to the WG, it will open at 9psi, and remain open. if you plumb it in with the turbo test port and boost controller, you can control/limit your boost upto 18psi.

good tip is you want a spring rated for the boost you wanto to launch at. (assuming you cant build your 13psi on the line)

myself for example, last year, i ran a 9~10psi spring. i launched my truck at 10psi, and never ran it over 15~16psi, (20psi being max on the 10psi spring, with a controller) so i was fine.

springs for a Tial 38mm WG are about $30 on ebay.

 

i bought another spring the small green but its making too muck boost. Right now i have no intercooler. My q i guess is what could be making it over boost. I have no boostcontroler its just workin off the wg spring the top port isnt plugged or any thing

 

If you are creeping up that much, I would first check to make sure the wastegate is opening fully. Make sure there isnt any corrosion on the valve shaft. If it is opening fully and there are no blockages on the WG downpipe, you may need to upgrade. Or you could try using a larger turbine housing.

In my opinion, a 60mm turbo is too small for a 6.0 anyway. You will be leaving power on the table with a turbo this small- alot of 5.0 Mustang guys are using a T70 with heads that dont flow anything close to what your heads flow.

 

I was looking at the mp t70s but i need $$$ i dont know that being a t60 was too small to where the exhaust being by passed was still spooling the turbo being such a small turbo (if that makes any sense) when i had the wg off i put shop air to it (not the full 300psi) the wg was opening. How high is the valve supposed to lift on the wg? Its opening like 1" or so

 

I have the same setup as you and find that the turbo will boost higher than the spring is rated for.

Yellow spring = rated @ 3.626 psi and I saw 5 to 6 psi
Red spring = rated @ 5.802 psi and I saw 7 to 10.5 psi

I never tried the Green spring but you get the idea. The green spring is rated @ 7.252 psi and I would expect to see ~ 13 psi with it.

I am now running the red spring and the STS Electronic boost control and it works great. I see 7 to 10 psi on the red spring but 12 psi on the boost control is much nicer. It comes in faster and stays stronger.

If you want to lower your boost you will need to install a different spring.