Old school. Nobody really cared that the engine puffed smoke when you accellerated. So, they had to cut emissions further with the higher psi p-pump and do away with the accelleration puff.
So, you neck/squeeze down the turbine housing and add a gate to prevent over speeding/boosting. Sure they worked great untill you add injectors and more fuel. The housings from 1994 were not all that great of a design as it has limited flow when the gate was opened.OK for low fuel setting I suppose, but today, that same turbo has a really big gate so to speak.
you can just change the exhaust housing on them to a smaller one very inexpensively and unless you start huge increases in power you can get by without a waste gate on the new one our 91 will have 900,000 on it in a few months this way
You don't need (or want) a wastegate running a 12cm housing with 7mm (stock IC) injectors. It will make a max of around 28psi boost with the wastegate wired shut and the pump turned all the way up. That combo works really well on a stick truck BTW, and non-wastegated 12cm housings are not too spendy.
The H1C and HX35 exhaust housings interchange as far as bolting together properly. The issue is the exhaust pipe if your going from a nonwaste gated housing to a WG housing. On our 1st gens to use a WG housing you need to shorten the exhaust pipe 1.25". Some have got lucky and been able to slide the pipe back.
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