SwiftTone

When I go full boost, my boost will creep up to 8-9psi. I have a S5 turbo and manifold. I'm planning on getting the wastegate ported, but I dont know how soon that can happen. So I just want to know if I'm hurting my motor by doing this. Also, how much boost is the stock BOV good up to. I recently reinstalled my stock one back on cause my Blitz DD was eating too much gas. Although, with the blitz I didnt have any boost creep. Anyways, thanks in advance.

~Dave

SureShot

Neither a BOV or the stock CPV should effect boost as measured after the TB (unless it is leaking badly.)
They are both in front of the TB.

The stock CPV can vent whatever the stock turbo can put out.
I have tested mine to 12PSI on a cool morning last winter (oops).
10PSI is about the practical limit of the TMIC.

The stock ECU is good to 8.5 PSI, and will allow 9-9.5 briefly before giving a fuel cut.

A big BOV is really only needed for an extra big turbo.

J-Rat

iTrader: (2)

Far as I know, as SOON as you reach 8.7, the stock ecu gives fuel cut. There is NO leeway. So Swiffer has an FCD.

SwiftTone

I have the RTek7 1.5 ecu chip, which includes FCD. But other than the fuel cut issue(which I dont have) is it dangerous to push the motor and its components to 9psis?

Madrx7racer

no.

SwiftTone

Thanks. If anyone can confirm this, it would be great.

bcool

confirmed

SwiftTone

thanks guys!

Madrx7racer

no problem....even though YOU DOUBTED ME!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

J-Rat

iTrader: (2)

General school of thought is that anything under 10 PSI is *safe*. However its ALWAYS a better idea to beef up your fueling BEFORE you start cranking up the boost.

NZConvertible

That's not boost creep, it's barely more than stock. Boost creep is uncontrolled boost increase, i.e. boost continues to rise as revs rise instead of levelling out like it should.

On a stock fuel system that boost is fine.

jacobcartmill

iTrader: (6)

dont be a puss

run 16

J-Rat

iTrader: (2)

And blow his **** up like you did?

fstrnyou

OR you can do what i did and run 20. did it for months on end and it still runs great. only fuel upgrade was a walbro 255 and duh, an FCD
I'M NOT ACTUALLY SUGGESTING THAT YOU TRY THIS!!!
BTW, about 6 months ago, i had it up to 26psi and i have a pic to prove it. but i had 850 secondaries installed then.
sure, 20psi didn't work all that great, but it was certainly better than 6psi, by a lot. about 15 seconds of 20 psi and it starts to stutter cause the TMIC is now completely heat soaked. even in the coldest of weather. but that's ok, because the 1/4 is over in 13.5



haha, i know NZ might remember me from a long time ago talking about ruining my turbo or something. but now worries, i'm back to stock boost now, but only becuase i have a defunct FCD.

RotaryEvolution

iTrader: (30)

20psi on a stock turbo? that's idiotic...

i think your boost gauge is broken too, i highly doubt the stocker could even push 26psi let alone hold together.

the idiotic part about it is anything over 12-13psi is doing absolutely nothing except decrease performance and risk the engine.

and i agree with those above who said under 10psi with the stock ECU/fuel system should be safe, i did it for a while until i upgrade my turbo and i'm still running the stock fuel system with no issues until i get the standalone installed.

RETed

WTF?
Is this the Twilight Zone or something???

BOV causing your engine to use more gas???
You gotta be kidding me!

8-9psi considered boost creep?
NZConvertible is right - it's not.

20psi / 26psi on the stock turbo?
Don't make me get out the BULLSHIT flag on your ***.


-Ted

bigdv519

iTrader: (3)

Thats the most hilarious crap I've seen all week.

Fuel Pump
FCD
TMIC
890 secs

All this worring about your psi, and you should be worried about your cfm's. You can have a really hot air, create great psi, yet have so little little volume due to...wait a minute, this is 6th grade IP&C. OMG.

EDIT: ALL THIS FOR A 13.5...LMFAO.

NZConvertible

Don't you just love it when people resurrect three month old threads to make a post barely relevant to the original topic...

Funkspectrum

iTrader: (5)

this is interesting....I think I remember laughing at this thread thinking that it would be a waste of time to post....

RETed

Don't lie...
All ya biatches are post ******!


-Ted

Funkspectrum

iTrader: (5)

Only between the hours of 9AM and 5PM monday thru friday...

fstrnyou

[QUOTE=Karack]20psi on a stock turbo? that's idiotic...

i think your boost gauge is broken too, i highly doubt the stocker could even push 26psi let alone hold together.

the idiotic part about it is anything over 12-13psi is doing absolutely nothing except decrease performance and risk the engine.
QUOTE]

Is it idiotic?
absolutely

is my boost guage broken?
nah, it's a brand new Defi guage.

is 20 psi slower than 13psi?
most likely, but it was creeping to 20 because my wastegate wasn't ported. only way to get around it was to either put my stock intake back on or just not give it WOT.

you wanna hear something even more stupendously idiotic?
for the most part, i had an inoperative BOV the whole time.(still broken)

that time i did 26psi, i was on the interstate in 4th gear, 850 secondaries and a kinked wastegate line. it was pretty neat to see it go up that high, but i only did it three times and for less than a second each time. just enough time to take a pic.

fstrnyou

You can take out that flag if you wish, but it doesn't apply here.

yes, that 13.465 was the fastest my car has ever went, and i was excited to see it. BUT, that was only if i had soaked the TMIC in ice and left a small pile of ice on it while i was racing down the strip. so my car is actually much slower (consistent 13.8's). and i'm well aware that i was making less power at 20 than i would have made at 15 or maybe even 12psi. but i was trying to do whatever i could with what i had. without a ported wastegate and a boost controller, there was no other way my car could have been any faster.

like i said earlier, i back to the basics. i can hold 6psi all the way now. an EBC is in the works as well as a standalone. so there. i grew a brain.

RETed

You still don't get it.

The stock boost sensor is a "2bar" MAP.
This means it pegs at 15psi.
The stock boost sensor doesn't know you're going over 15psi.
Which means...the stock ECU doesn't know you're going over 15psi.

Which means, if you try and hold it at 20psi...26psi, the motor will let go.

Now, if we're talking about spiking, then that's different...
Spiking to 26psi is a LOT different than RUNNING AT 26psi!


-Ted

fstrnyou

nah, i never "ran" it at 26psi. 20psi however is an entirely different story.

and i thought with an FCD, that the ecu never sees anything past 8.5psi.
it probably wasn't the best idea to leave it at stock timing either.

i'm ordering an Rtek chip today or tomorrow so at least i won't have to worry about the timing being too advanced under boost. and no, i'm not going back to 20psi.

and if you doubt i ran 20psi on a normal basis, go on over to Bigboosting.com and ask around. most of the people there are locals from where i live. some like me, some don't, but anyone that knows me, knows what i run.