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what PSI is good?

887 Views 15 Replies 8 Participants Last post by  HalfTime
ok well....i blew my motor...i was running a precision turbo kit at 10psi (Garrett GT-28R) on stock internals....now i have my car back but bone stock....i was thinking about putting the boost back on but i want a safe psi so i dont blow it again....i plan to build the motor soon....but until then i need a high but safe PSI....thnx
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Discussion Starter · #3 ·
i had it tuned from SCT but then i added a BOV and didnt get it tuned....maybe that would be the cause?..i dont know...10psi on stock internals.....isnt that a lot of pressure for a solid deck motor
 

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Discussion Starter · #5 ·
18Lbs Jeez....did you want to blow it?.....well i had the 10lb for like 7 or 8 months until i put on the BOV and about 2 months after i put on the BOV i was racing a mustang on the highway and i shifted into 4th walking on this mustang i got past him and turned on my hazards.....i had about 2 cars at 125 and then all i see is smoke and my motors dies.....and im lke O shit.....Embarrasing ....lol....mayb was a bad tune....i git what i pay 4
 

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y would you not get the BOV in the first place? They are cheap and are almost a must to have. Without one the charged air between shifts goes back into the turbo which is definitely not good for it also you probably had spikes in your boost pressure sine the charged air had no where to go when you shift and your TB closes. So even if you had it set at 10psi your engine probably was seeing 11-13 when you shifted.
 

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Discussion Starter · #7 ·
the reason i wasnt running a BOV was because i wasnt racing it and really had no need for one if i wasnt boosting crazy numbers and on the other side i didnt want to get a tune because that is more money for a piece of equipment that goes....whhoootshhhhh....but then when i started to push on it a little....well then i needed one...because yes i kno....when the TB closes there is no where for all that boost to go.....so where does it go?! right back out the turbo...in a process called back spin....which is bad...but in the end the turbo is fine.....very minor shaft play....
 

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i had a GT28R running 10Psi for over a year with stock engine, had no issues at all.

I run no BOV, its not that bad that it'll do damage with in a few weeks, cosworths run no bov most of their modified life it isn't too much of a problem it reduces the life of the turbo sure, but Ball bearing turbos aren't as affected, still may cause the life of the turbo to be reduced, but its not like its going to fall apart with out one.
 

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a BOV isn't going to effect the running of the car on boost. it may make it back fire on lift off as it dumps the air if the BOV is inbetween the AFM and TB and if its an atmos type of course.

it shouldn't of made the engine go pop thats for sure.
 

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danworth said:
a BOV isn't going to effect the running of the car on boost. it may make it back fire on lift off as it dumps the air if the BOV is inbetween the AFM and TB and if its an atmos type of course.

it shouldn't of made the engine go pop thats for sure.
that is what I was thinking. That is why I think it was bad tuning from the beginning. Did you have it dyno tuned with a wideband air/fuel? or was it with a tailpipe sniffer? The tailpipe sniffers are usually about a point off what it would be with a wideband. So your A/F might have been off.
 

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Discussion Starter · #15 ·
i just realized that when i put the BOV on it started to run really rich....i had a liquidcoming out the tal pipe and it smelled of gas.... a lot...any input of how i can prevent it again when i put the boost back on would be great....
 

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It's all in the tune man. On stock internals now, I'm at 12psi. I have bean up to 16 psi for 9 months befor I switched to a larger pulley. A tune is the most improtant part of any modification. Anyone in here who knows what they are talking about will agree.
 
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