if u set 2 bar boost at NA block also no prob if u occasionally floor your pedal...try to push your engine like NA engine with 0.7 bar then see what happen...as i know if u bolt on your NA block the max safety boost only arround 0.5-0.6bar and must be low compression...if u use stock piston 0.5bar already easily rip your engine...already saw many case like this...
Well, numerous 4G67(NA) has been producing 4++WHP on DynoDYnamics with no problem. Same goes to 4G93 with 2++WHP on DynoDynamics. The key is tuning.
if u cant afford to buy GSR block (coz very expensive), then rebuilt your short block propperly...the MUST item such as thicker metal gasket, low comp piston (oem GSR should be enough), oil squitter / jet & a good oil pump (4g93T/NA twin cam) should have inside your block if want to enjoy boosting 0.7bar continously and constantly...
Thick metal gasket is just a decompression method. If low compression piston is used, there's no reason for thick metal gasket anymore provided there are some clearance issue.
Oil squirters are mainly to cool down the piston crown. I've been boosting 1+bar with a GT2560R for 2 1/2 years with 4G92
P with 4G93 DOHC OEM oil pump. No problem. Well, an oil cooler will add on some advantage here.
normally those people bolt on their engine didnt take look at oil pump...this is very important item for turbo for those who really know abt it...weak pressure from oil pump can be a risk to rip your engine...
Yes... But OEM Oil pump are sufficient. As long as they are in good condition...