Recently purchased a 94 FD that has a greddy t78 kit on it and its missing the wg. PO said someone stole it while it was parked on the street. Pipe coming off the manifold going to the WG has a 4 bolt flange style connection. I need to buy a WG but i do not know what size i will need. 46 or 50mm?? And does every 4 bolt style WG have the same bolt pattern size?

 

you need 50mm

 

50mm would be good.
Info: you can go Vband if you want without welding on a 4 bolt flange.
Banzai-Racing has an adapter.

 

what's the highest and lowest boost you plan to run? how restrictive is the exhaust? are you planning on recirculating the dump tube?

 

Arghx, I was awaiting the OP response to your questions^^ to find out how this relates to wastegate sizing. Based on your questions, could you please show us the relationship.

 

bought a greddy 50 mm off someone on the forum. bolted up nice and used a dump pipe. having some running issues im trying to work out before i go out and test out the WG. falling flat on its face when cracking throttle. idles and runs perfect but when under load completely cuts out. ahhhh. i posted the thread in 3rd gen section and trying to search and find out the problem currently

 

I believe there are 2 different 4 bolt patterns- I thought a
a greddy style WG has a more square style compared to a HKS- or am I full of **** on this?