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Hi scoobies mates..

 

A much pondering question for couple of years about BOV ( vent to atmosphere type ) and here I have a friend to assure me BOV are not going to foul the plugs and air/fuel ratio.

 

I had been reading much about articles all around the world through google search, in most forums and many claim that if you install a vent-to-atmosphere type BOV, it will start to foul your plugs when you close throttle , because stock setup of Rex had MAP sensor that is installed before the BOV. Thus when you are at high boost, fuel is metered rich to prevent knocks, lean, and cooling of pistons / cylinder.

However when you lift off the throttle, all that moment when the ECU is still trying to "enrich" the fuel mixture, there is a sudden lost of large flow of air intake ( because you shut throttle ) and then the pre-determined amount of fuel that was suppose to give the mix a proper percent suddenly becomes overly rich with fuel due to the low air intake.

After long time, the plugs will be fouled, due to over richen mixture everytime you close throttle after boosting.

 

But recently, my friend tells me it doesn't work this way. Because there is a throttle position sensor ( or something else ) at the intake throttle body where it also reads the throttle position, and will regulates the fuel accordingly, without the above mentioned fouling issue.

 

So may I understand further, what my friend claim was true ?

 

If so, I may want to get a BOV to try it out.

 

Thanks all and keep boosting !

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reading from my AFR gauge, it will spike a rich afr after you left off your throttle. but its only a quick split second. 

can't comment if it will foul the plug. i'm going to change the plug soon. maybe i could show some picture

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I switched to a BOV and i experience very bad backfiring. also engine stalling on low speeds once i lift off the throttle.

Feel frustrated, i revert to stock.

 

any idea what should be done to prevent this?

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I switched to a BOV and i experience very bad backfiring. also engine stalling on low speeds once i lift off the throttle.

Feel frustrated, i revert to stock.

 

any idea what should be done to prevent this?

 

what bov you are using???

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Revert to stock, see if u have any other problems first

 

yup, have already revert to stock. and all went well again.

 

 

ur bov might be leaking. do you have another bov to try?

 

any other signs/symptoms if its leaking? boost holds very well with the bov.

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i have the same issue as TS previously.

 

end up is BOV faulty. Diaphragm in BOV spoil thats why unable to hold boost.

 

After changing the BOV resolve the issue.

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Quite a few topics on this...

 

In a nutshell:

 

Vent to atmosphere - its okay if you running bigger turbo, above 1.4bar. No problem. A little rich is ok. Cause already big turbo. Otherwise, stock is best

Pump back system - Its the best option for E-throttle system. Best throttle response after all gear changes. Either stock, or above 1.4bar, go aftermarket

 

 

I run VTA on e-throttle for 8 years. No prob at all.

 

sidenote: SSQV is the worst performing BOV for e-throttles.

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