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Max Boost sr20det....

11K views 21 replies 12 participants last post by  minime  
#1 ·
Hey please help. Im running a sr20 redtop in my 93 240sx. I have full exhaust and air intake. Walboro 255 fuel pump. Everything else is stock. Its pushing 7 psi, but with a boost controller what can i safelty turn it up to? 10-13 psi? Thanks for any input
 
#6 ·
If you dont have upgraded injectors then I wouldnt run more than stock boost. Sure you can probably get away with it but you wont know for sure how lean you will be running if you dont have an a/f gauge. Im running Denso 550's and set my Greddy Profec B to 7 psi low and 11 psi hi. Keep in mind Im not tuned yet so its running pig rich. In my opinion, its not safe to run 1 bar with stock injectors. At that point you're really pushing the stock T25 aswell.
 
#12 ·
I do have a front mount intercooler, blow off valve, and upgraded maf. I dont have an upgraded fuel pressure regulator and injectors are stock. So i should be able to run atlest 10 psi of boost? Dont go over that til new injectors and fpr?

I wanted the profec B boost controller, but im gonna start with a manual for now and see from there. woul i be okay raising the boost a little bit with what upgrades i have?
 
#13 ·
I do have a front mount intercooler, blow off valve, and upgraded maf. I dont have an upgraded fuel pressure regulator and injectors are stock. So i should be able to run atlest 10 psi of boost? Dont go over that til new injectors and fpr?

I wanted the profec B boost controller, but im gonna start with a manual for now and see from there. woul i be okay raising the boost a little bit with what upgrades i have?

I wouldnt. Im hesitant running over stock with my mods and I have an upgraded fuel system. Just need it tuned to safely run at 1 bar. Its your motor though. Just keep in mind that higher boost and stock fuel system means a lean condition. Lean = Motor go Boom!
 
#15 ·
i have been running 14psi with no problem. still runs rich enough and its a stock s14 black with all bolt ons. only fuel upgrades are walboro 255hp pump and tt 300zx fuel filter. i dont wanna go boom but have had no symptoms of the cranked boost besides raw power
 
#16 ·
I ran 15psi on a stock redtop with frontmount and no fuel. the car was a beast for a while ( a year or so) then the crank bearing pooped and I had to do major upgrades. I don't think 10psi would hurt but then again you don't know what you get with USED motors. Mine just happend to be pretty strong to last that long. Oh, and I have a HKS evc and that bitch is grreeaatt.
 
#17 ·
My question is how much boost can the stock block take?? Here are my mods: Denso 550's, Z32 MAFS, Walboro FP, Nismo FPR, ARP Head Studs, Cosworth 1.1mm HG, BC Valve Springs, Greddy RAS, HKS Step 2 264's, stock s14 T28, Greddy Profec B, HKS Type S FMIC, HKS SSQ bov and of course full turbo-back exhaust. Can I expect numbers close to 300whp once I get my Enthalpy ecu???