Camaro9969

iTrader: (12)

So on my lq4 s480 build im using the twin scroll set up and deciding where to go on waste gates. Really think the two wastegates is the best way to go but most people say the big 60mm is just fine. What do you all think? What are the pros and cons of running one big or two say 44mm gates. Two gates isnt that much more than just one and since i'm using the twin scroll figured it has to be best but i'm new with all this. And was thinking Tial or Precision.

Sweet_SS

If its a twin scroll...assuming your running a divided crossover. Then I would just go with twin Tial 38 mm gates. The reason here is, the v-bands and the 40 series are a bit over kill IMHO. You have to run dual gates if your divided. I had twin 44mm Tials on my old GT4294 . I think you will be fine...could always go with Precision 39mm wastegate's. I have one right now and I love it. Come's with extra springs as well.

westtexasbuff

iTrader: (40)

Depending on placement and angle, a single Precision 46mm or Tial 44mm wastegate would be fine. If you wanted to be on the safe side, run a Precision 66mm.

Sweet_SS

@ Westtex, I thought you couldn't run a single gate on a divided (twin scroll) housing.

JAX04

iTrader: (17)

You can, but it does require another "merge" to be made, check out dschmitte's build. He did it, lots of guys do it, if i had the room, or my cross over was in an orientation to where i could've built a merge, i would've done a single precision 66mm gate, instead, i have twin PTE 46mm gates.

EDIT: And in my honest opinion, dealing with flow and such, i think its probably very important to make sure each runner for the wategate is equal in length and in bends.

But im no expert and have no data to back this up, but it just makes sense in my head...

Camaro9969

iTrader: (12)

Ya i saw that build its a good idea just figured it would be better to have two gates. i like the precision 39's the price is better than the tials. i've read both are equal in quality. But i agree both should be equal and i'll make sure of that.

Camaro9969

iTrader: (12)

I guess i'm going to go with one gate............what you guys think Precision 66mm or the Tial V60mm. I really like tial i feel its the best you can buy and made in USA but what are your thoughts?

Toxic-Evo

iTrader: (2)

U spent the money on a twin scroll

Do it right run two waste gates and get better control.

3800SII

It is better to use twing gates, but sometimes space and location of the runners dictates that you only have room to run one. It was a complete PITA to run twins on mine while getting optimal flow through to each gate. I am also using twin 40mm gates because they have a v band flange.

There is also a thread running around this site about equal length runners. It is a great thing in the area of fluiddynamics, but it is not 100% necessary especially since you have a V8. Just make sure that each cylinder bank is separated into each side of the turbine housing and you are good to go!

ls1curt

iTrader: (31)

If done correctly, a single gate can/will control just as good as two.

denmah

iTrader: (2)

x02 60mm vband, comes with 4 springs, works great, 120 dollars