Looking for opinions on what boost levels I should run rb25

Discuss the RB20, RB25 and RB26 series engines.
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Marahutay
Posts: 93
Joined: Mon Jun 16, 2008 3:55 pm
Car: 1991 Nissan 240SX Fastback

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Greetings guys! My rb25 build is nearing completion, and I need some opinions on what would be a safe level of boost to run on my factory fuel system/tune. I have a Precision 34/31E turbo that I know can easily surpass the factory injector capabilities, so I was wondering what would be the strongest spring I could put into my waste gate that wouldn't be risking any damages? I have a wideband to reference but I'm not familiar with the limitations of the factory tune on the r33 ecu. I am also running a z32 MAF. I planning on putting just an 8psi spring In, until I have the money to have it dyno tuned and I plug the haltech in and put in the 740cc injectors unless y'all think I would be okay with more boost than that.

Thanks for your time!!.


RRRRB
Posts: 758
Joined: Wed Jun 01, 2011 9:31 am
Car: 98 RB powered S14
Location: WA

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i wouldn't even go into boost until its tuned correctly.. surely wouldnt go above factory boost... keep an eye on your wideband.

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SullivanRacing06
Posts: 1974
Joined: Sat Apr 21, 2007 8:45 am
Car: r32 gtst, 06 350z, r32 gtr, rs4 steaga, 04 350z, f350/6bt
Location: Gainesville

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A factory z32 maf on a 25 ecu will not read correctly, keep the factory maf untill your ready to tune but why not ditch the maf for a map of your going to be running a standalone??


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