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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > my vishnu pwm meth not working



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      01-25-2013, 06:24 AM   #1
diddlkiss
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Whats the max psi of stock turbo?

Hey guys
I have 2 questions
the one
whats the max psi of stock turbo?
I use the meth100% and Ron97 fuel,but I can see the max only 17.3psi,I have FMIC BV DPS(catless)
DCI
the second question
I use the vishnu pwm 3month,but in winter its not work,the temp is 35F here.

thanks for any replay
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      01-25-2013, 09:32 AM   #2
135Pats
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I have no idea what's wrong with your meth kit, without more detail it's tough to trouble shoot. Talk to Shiv he'll be the best resource for this. There are some folks with N54s running 20psi or so midrange, some also run aggressive tapers that hold boost pretty high towards redline. Anything over 20psi and I'd have to think you're leaving the efficiency range of our stock units. 17.3psi seems a bit low for FBO+meth, i'm currently topping out at 17psi or so midrange without catless downpipes or meth.
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      01-25-2013, 10:20 AM   #3
diddlkiss
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Quote:
Originally Posted by 135Pats View Post
I have no idea what's wrong with your meth kit, without more detail it's tough to trouble shoot. Talk to Shiv he'll be the best resource for this. There are some folks with N54s running 20psi or so midrange, some also run aggressive tapers that hold boost pretty high towards redline. Anything over 20psi and I'd have to think you're leaving the efficiency range of our stock units. 17.3psi seems a bit low for FBO+meth, i'm currently topping out at 17psi or so midrange without catless downpipes or meth.
When I installed the RB turbos,I got 17.6psi only,I dont know whats wrong with my car.when I back to the stock turbo,I can see 17.3psi in the datalog.
my pwm its work now,when I upload the new map.
I see my log the fuel trim all maxed sometimes,like the log.
I run the stage3,
start boost map1(60%) map2(85%)
limit:20psi
OL 100
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      01-25-2013, 01:24 PM   #4
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Vishnu or a member needs to adjust your fuel tables to allow more open loop fueling. Free bump.
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