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compression test, boost leak test, timing test,
Get compression numbers from the engine. Use a Decimal place, i.e. 125.4psi, 123.8psi, etc...
IF the engine is below the FSM limit (128psi?) it needs a rebuild. If you get like 135-145psi of compression, and the engine is internally clean and never made any knocking noises etc...
Then I would still trust it at 350hp for a while at least, as long as its always been run with an air filter.
The air filter and PCV system are what keeps an engine clean inside, and healthy for a long time. So if it has those things...
Then put all stock equipment back on. Factory ecu/harness/injectors etc...
Would be ideal. The issue is you don't have a good turbo (no oem sr20 turbo is very 'good' these days) so If you upgrade the turbo, use a brand new unit, and use
power FC + 740cc injector + Z32 maf
if the engine is good and has low mileage.
Otherwise sr20 is double trouble, you got a poor quality engine and poor quality turbo, thats tough luck. Need to rebuild the engine and buy a new turbo.
And if its been run long without a filter, you may need a whole new block.
tips
dont use OEM turbos anymore
dont use USED turbos
dont trust any machine shops to do any machine work
if you attempt a rebuild use the FSM procedures and avoid machine work
Try to buy a used power FC for redtop L-jetro from ebay for $500~
Dont buy expensive EMS systems that you will totally lose your @$$ $$
Focus on cleaning and maintaining the engine you have if its in good shape
If you can't tune a PFC then maybe find a place to rebuild the stock turbo (sometimes that works) for like $60 or something, then use back all the oem electronics.
At all costs avoid expensive engine managements and used turbos and machine work.
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