I was looking at the post of Reeves car and it writes:
extra spring on WG to hold it shut $1
Why would you close the wastegate? Did he do this to eliminate it, and substitute it for a blow-off valve and boost controller (w/ high boost)? Just wondering?
TC23
I'm going to assume that he did that so the wastegate doesn't open till a higher boost level than stock.
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mods: SDS Digital Fuel Injection, ported & polished big valve head(1.89/1.59), .500 lift roller cam, custom upper and ported lower intakes, 60-1 stage III .63 turbo, powerstroke intercooler, 60mm throttle body, 75pph injectors, Walboro 255HP pump, Kirban adj. fuel reg., ATR header, 3" exhaust with Dynomax Ultraflow muffler, MSD 6al, MSD coil, MSD Launch Control, MSD 8.5mm wires, K&N filter, Star stage III clutch, Greddy Profec B boost controller, Weld Draglites with M/T ET Street 26x11.5/15
I guess he is putting more holding pressure to keep the waste gate shut and build/hold boost.
This is known as "running around on the waste gate" by turbo engineers.
The exhaust has to get out somewhere though as rpm increases, so usually a bigger turbine is recommended.