How many pounds?

[gtst_skyline]

Im wondering how many pounds of boost i can run on my stock fuel system without problems.

[r33_gtst]

Id be more concerned about the turbo if it's oem. 10-12psi max on these ceramic turbos.
If you manually turn up the boost, and that's all, might be runnin a little lean. With changes in air comes changes in fuel. 1psi increase changes things across the board, may not be completely noticeable to you but the car feels it.

[trickey1991]

my buddy just got his compleetely stock RB20DET tuned an ran 217whp at 12psi and everything is fine. 89% injector duty cycle

[gtst_skyline]

im looking to put an aftermarket turbo in and am wondering what kind of boost i can run without changing injectors or anything

[GTS-James]

i have a rb20det running a t28 ball bearing, i get a miss at 15 lbs of boost thinkin too much for the stock injectors, i dropped to 13ish maybe 13.5 and seem to be doing alot better

[r33_gtst]

Regardless the route you go, the fuel set up is gonna have to be upgraded too. If your going to keep the ecu stock, you might want to look into a greddy profec, or the full step and get a standalone. But to answer your concern, yes you can change the turbo and turn up the boost, just expect the motor to last 12 months. My build last year was a planned $4k which slowly turned into $11k by the time I was done. Do it right or don't do it all, you cant skip steps with these cars. And good tuning too. I've been runnin 20psi on a stock rb25, bolt on everything and fully tuned at 492 rwhp for 14 months now and haven't had an issue. 750cc injectors running at 40% duty cycle. I did 550 km in one day on a country drive, drove for hours, occasionally beating on the car hittin the rev limiter. At the end of the day, spend a bit more and do it right.

[Supraclean]

stock head and bottom end on you rb20?

[trickey1991]

I just got my tuned a as well ahah about a month ago now.. its tuned to 13psi with the stock injectors they are running at 89% duty cycle as well .Im running a T3/T4 54mm Precision Journal Bearing Turbo. So I'd say stay around 12-13psi until you upgrade to at least 440CC injectors. Personally Im going with the RB20DET Deatschwerks 440CC injectors for $329!!!! like come on...$329? cant go wrong and they're a reliable company. thats my .02