I wanted to get everyone's input on running a 42R or s372 with single wastegate or is dual wastegates better...Is it bettwr to run a 44mm wastegate or bigger if single or 2 44mm for dual setup. Thanks

 

What are your plans for the car? If you plan to run at the track only, a single might do just fine...if you plan to use it on the street occasionally at lower boost, then 2 might be the better route. Let us know what you plan to do and you'll get better answers.

 

if you are running a twin scroll manifold, the only way to do it right, is with 2 gates. 2 44's will be fine.

 

yea I plan to make it an all out track car maybe I mean maybe drive it on the street a few times out of the month

 

I agree with Mike...if its twin scroll, then dual 44's is the only way to go. If you're using a standard manifold, then 1 should be fine if its a track only car. Since you're planning to drive it on the street, you're going to need 2 in order to control boost at lower levels on such a large turbo. You could just switch over to one 60mm also...

 

1 wastegate will work good if you want to spin straight through the first 2 gears.

aparently the only exemption from that is inline pro manifolds

 

has anyone even ran the 60mm wastegates?? im in the same boat...but im not going for that large of a turbo (s366), goal is 700hp and from what i read that turbo seems to push that power out. i seen alot of people run dual wastegates on a large turbo, just due to that u can run lower boost...but i never seen a 60mm in use...

 

the s366 will easily make 700, we are shooting for upper 700's on the s366xl we will be testing very shortly

beleive it or not, the 60mm gates are harder to fit in our engine bays than twin 44's. also, most running turbo's at these sizes see big advantages to running divided exhaust manifolds, so it makes more since to run 2 gates instead of trying to "Y" off of the manifold into a single gate.

the 60mm gates seem to work real well though when you can make it happen

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boostedcivicsir &raquo;</TD></TR><TR><TD CLASS="quote">if you are running a twin scroll manifold, the only way to do it right, is with 2 gates. 2 44's will be fine.</TD></TR></TABLE>
not true. if you keep two divided runners all the way up to the valve in the gate, it will work fine. i have done it several times. it is a little more fab work because you have to make a divider all the way to the valve or it won't work right

 

is that the same Cotorres gee from Hocus Pocus ? if so, i bought your skinnies back in like 01-

 

I will be running the 372 divided with twin 38mm. How low would I be able to boost on the street? (b20 block) How do you figure out what size waste gate spring you need if your running twin gates divided? Since your spliting the pressure on the gates.

 

s372 is a little to big for the street in my opinion...haha

 

not true. i run h22 and the bw471 with a 60mm wastegate on the street and its fine it all depends on your goals and how you like to drive your car. and trust me when its time for boost to come in its there. and if your at the track using a 2step theres no prob having boost. im running a .90 a/r and i think you can get the 372 in a .83 a/r so boost will come faster. (like Turbo-charged said)"" the s366 will easily make 700, we are shooting for upper 700's on the s366xl we will be testing very shortly" so pending on goals and weather its street or track any one of theses turbos can get the job done. and remember these turbo are built to run at hi pressure 25psi and up thats there sweet spot
so anything from 10-18 psi nothing compared to 30psi were the sweet spot is.

 

I am also interested in seeing twin 38mm with a larger turbo(PT74). Would this be as good as one 44mm wastgate?

 

on a 67mm i had a car that wouldnt make less than 25lbs of boost with a single 38mm, i added a 2nd 38mm gate and we got the boost down to about 12psi

 

i got 7lbs off waste gate spring. and no boost controller and 13lbs using a man. b/c im going back when i get s300 1600 injectors ran out fuel on 1000's what mani was you using?

 

yes sir that is me...getting back in the game!!! watch out for me!!!!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nitroice40 &raquo;</TD></TR><TR><TD CLASS="quote">I will be running the 372 divided with twin 38mm. How low would I be able to boost on the street? (b20 block) How do you figure out what size waste gate spring you need if your running twin gates divided? Since your spliting the pressure on the gates.</TD></TR></TABLE>

its based on pressure...not flow where i think you losing it...now that each bank is divided, you run whatever psi you want to....its the pressure source going to the top of the wg that will have to come from the same source to balance out each bank to eachother...

so you wanna run 9psi...get 2 9psi springs

 

That I do understand. I was thinking more along the lines of there being to much pressure and the gate being pushed open. Tial dont recamend you go over 2x the spring rate with a controller. Since it will be a divided housing and the combined back pressure will be split (2 cylinders on each gate). Would I be able to run a little bit smaller spring and acheive the same boost pressure as I could with a non divided housing? Since there will be less back pressure on each gate.

My main goal it to be able to run 35-40psi at the track and as low as possible of the street (10psi). Without changing the springs and without getting creep at low boost levels.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Schister66 &raquo;</TD></TR><TR><TD CLASS="quote">What are your plans for the car? If you plan to run at the track only, a single might do just fine...if you plan to use it on the street occasionally at lower boost, then 2 might be the better route.</TD></TR></TABLE>

Depends on how intelligently the wastegate port is placed. GT40+ can be run at 7-9 psi flat as a strap with a single 44mm gate, the BW setups I have no experience with but I envision similar results.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Turbo-charged &raquo;</TD></TR><TR><TD CLASS="quote">on a 67mm i had a car that wouldnt make less than 25lbs of boost with a single 38mm, i added a 2nd 38mm gate and we got the boost down to about 12psi</TD></TR></TABLE>

sounds like a pain in the *** car