twin wastegate sizing help

[cummin get it]

Truck details.
02 dodge
6 speed
3600 sbdd
Super phat shaft 66 .80 t3 over billet bullseye s480 .90 t4
Sovp44
8x.011 sticks
Smarty
Drag comp
Fass 150
Studs
110 springs
Afe intake and intake elbow
4" exhaust no muff

Would the enternal wastegate on the 66 be enough or does it need an external gate. Plan on putting the s480 sometime this month just a single 66 right now. Also shooting for 650hp does this sound possible with these twins/fuel? Thanks.

 

[chevota84]

Way too much turbo but I would think the gate on the 66 will be enough. I have a super b over a 475 through the stock un-ported gate and my drive/boost stays very close to 1:1 until 3400 or so

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[DDually]

You have enough air for 900-1000+ HP with those twins

 

[DDually]

Holy crap I just saw your exhaust housing on your primary. If it was me I would go to at least a 1.10 a/r.

 

[matty169]

You can make 650 with the 66 alone.

 

[cummin get it]

Ok so a larger a/r on the primary that's no big deal ill get a 1.1. Is it safe to expect spool up around 1800?