Turbo Motor Discussions about aftermarket turbo'd 240sx and Silvias.

What do I need for 14 psi?

Old Dec 7, 2003 | 02:57 PM
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asalatt's Avatar
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What do I need for 14 psi?

I wanna push 14 psi on my stock turbo? Do I need bigger injectors, fuel management or anything else besides the boost controller?
Old Dec 7, 2003 | 03:20 PM
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14psi isnt safe at all on the stock turbo just letting you know..
Old Dec 7, 2003 | 05:57 PM
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I thought it was, why isn't it?
Old Dec 7, 2003 | 09:21 PM
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Originally posted by asalatt
I thought it was, why isn't it?
The peak boost you should run on the stock turbo is 14-15..very iffy if you were to ask me. And the stock side mount IC wont take that much boost I belive..its max is I think 10-12.
Old Dec 9, 2003 | 09:27 PM
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plus from some research I have done once you run 14psi on the stock turbo its past its effenciency range so you really wont see much of a gain from running more boost
Old Dec 14, 2003 | 04:13 PM
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14psi is fine with the stock T25. You won't have any problems. Above 15lbs and you should do it only for "special" occasions.

But as far as efficiency goes, the T25 runs out of gas at around 17lbs, depending on age of turbo and usage. To run 14lbs. all you would need is a FMIC to be on the safe side, injectors will be fine at this level. Depending on the outside ambient temp. i.e. a cool winter's night, a SMIC will handle 14lbs too. Also, make sure your BOV has the proper spring to handle the boost. I found that at 14-15lbs with my SMIC, my BOV was "floating" open a bit, causing the car to sputter under WOT.
Old Dec 27, 2003 | 05:11 PM
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i have a front mount and stock t25 (sr20) would boosting 15 for like 1hr be bad for the turbo
Old Dec 27, 2003 | 06:05 PM
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For a hr...It all matters on how hard you are pushing it. Like daily driving for a hour at 15 shouldnt hurt it...But if your pushing the sh*t out of it you might wanna really look out. Remember, the stock turbo can handle 15-16psi MAX.
Old Dec 27, 2003 | 07:05 PM
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thankz
Old Dec 27, 2003 | 07:06 PM
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No prob
Old Dec 27, 2003 | 07:10 PM
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hey do u now any where to get a t3 or t4 what ever is better that uses the stock housingand manifold
Old Dec 27, 2003 | 07:48 PM
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Not off the top of my head...
Old Dec 27, 2003 | 08:13 PM
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hey i got a spec stage 3 clutch 4puck for my car i put it in about a month a go and i broke it in for 408 miles before i really got on it on now if ****#$% slips and that sucks its brand new is that normal it shouldnt be
Old Dec 27, 2003 | 09:42 PM
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that doesn't sound right. any kind of aftermarket clutch like that shouldn't slip too much. you probably glazed it too early. just drive it around normally for a little while and see if the sloppiness clears up.

btw, the only thing you should be worried about with running 12+ boost is the stock fuel pump. our cars are getting old and the fuel pumps aren't going to be able to handle the demand of certain applications, like say WOT at 14 PSI. Which reminds me...I need to get a new fuel pump
Old Dec 29, 2003 | 06:24 PM
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Originally posted by bonomo
hey do u now any where to get a t3 or t4 what ever is better that uses the stock housingand manifold
Well, the stock manifold has a T25 flange. So you would have to modify the flange to make a T3 or T4 turbo fit, as they require a T3 type of flange. Save yourself the trouble and get a JGS log style manifold, it will be able to handle the T3 or T4.

As for the clutch, if it really is slipping bad, then the clutch disc is shot and will need to be replaced. It will be fine when you first start the car up and drive, but once it gets hot it will start to slip again.

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