wastegate setup for gt40 on the street

[MitchooO]

hey guys i am getting ready to finally put everything back together the way i wanted it on the vr4, built bottom end with a good head and valvetrain, im going to be running a GT4094r on a big ol top mount,850 inj for now to get it on the road on 15-18 lbs. and a set of 272 or 280 cams, i havent bought them yet. the manifold has a big round v band flange, looks like a 44 or a 50? ive never owned anything bigger than a 2 bolt 38mm so i dont know wat im going to need to control this thing, i was going to re weld a few things on it and run dual 38's but if i can id just like to run one big one, are their any advantages/disadvantages over either setup, anyone else running this big of a turbo on the street with either wg setup? i can post some pics of the setup if it may help, thanks alot for your info guys

 

[Rausch]

Lower boost = bigger gate.

The gate has to pass more volume to maintain lower boost levels. Keep in mind that if you have a large gate and are trying to run higher boost levels later, you may run into some hang-ups.

 

The tial 44mm will be fine for your application. It is true a smaller gate will control higher boost levels better, but we have run a lot of larger turbos on a single 44mm.We just ran a 44mm on a BorgWarner S366 ETT we originally tuned it on 24 psi and now it is tuned at 34 psi on the same gate with no issues.You might want to also take a look at the new precision 46mm gate. It is a little more money but you get all the springs with it.

 

[bazeng]

44mm here.

It'll run just like any other external gate.
What controller do you plan to use? or will you be keeping it mechanical?

 

[MitchooO]

i have the greddy profec b and i was probly going to try running a little less but if it will stick at about 20-25lbs. i guess ill get it tuned for that!