do automatics need to run a bov?

[JZA20]

Hi people, im going the single route on my auto 1j mz20 and i was told by a 'friend' that autos dont need to run blow off valve and that it robs it of power, is this correct? I was a bit sceptical...

cheers josh

[Cuzzo]

Punch your "friend" in the nipple..

BOV's arent needed on any setup.

[codez]

Punch your "friend" in the nipple..

BOV's arent needed.

Isn't that what his 'friend' said?

[reecegze]

Whilst accellerating they wouldn't but when coming off boost ull need one or ull dose/flutter unless your running plumb back

[midnight_purple_GA70]

Whilst accellerating they wouldn't but when coming off boost ull need one or ull dose/flutter unless your running plumb back

and how does that make any difference to the automatic transmission?

[Draven]

it doesn't, but unless he wants a full-sik auto, a plumb-back isn't a bad idea. Just a random Bosch one will be fine (used on turbo porsche's, etc)

[river]

Hi,

Yes, they need a BOV or you'll get flutter. Trini was an auto and she needed a BOV.

She is now becoming a manual and is still using a BOV.

seeyuzz
river

[midnight_purple_GA70]

Hi,

Yes, they need a BOV or you'll get flutter. Trini was an auto and she needed a BOV.

She is now becoming a manual and is still using a BOV.

seeyuzz
river

you will get flutter regardless to if it has an auto or a manual behind it...

or am i missing some point or joke here?

[HAVABEER]

my brothers Mitsubishi legnum is auto and has an BOV that vents to the atmosphere, it has not robbed him of any power, though it hasn't given him any extra power either.

[Cuzzo]

My dads truck has a BOV and the hamburgular has robbed him of all of this power.

[Draven]

ok.

A proper BOV will not add/reduce power.

It may improve boost response on gear shift (point of contention), but main purpose is to shut the dose up.

Auto, manual, makes no difference.

Your auto will still hold more boost between shifts than any manual

[Cuts]

i took the bov off my chaser (which is auto) and in this instace it changed my responce slightly cause they are a backwards bov. (computer holds them open untill it wants teh powaz)

but the point here is you are driving normally (auto) then your never off the throttle severly enough to get dose (or bov release of you have one).

[trdee]

the dose is your compressor stalling due to the boosted charge coming back through your compressor wheel

bovs arent installed from factory for nothing..........

and whether the car is auto or not doesnt matter. you still need to come off the throttle at some point

[reecegze]

and how does that make any difference to the automatic transmission?

Trdee explained it better , you gotta take your foot of the accellerator sometime. Haven't you seen those fully sik vl commos with automatics and no bovs.

[JustenGT8]

the dose is your compressor stalling due to the boosted charge coming back through your compressor wheel

bovs arent installed from factory for nothing..........

and whether the car is auto or not doesnt matter. you still need to come off the throttle at some point

bollocks

There's no 'stalling'. All a BOV does is reduce noise, end of story! They are there factory for this reason only. The performance difference from having or not is two parts of fark all (in favour of not and tested).

So, not needed but a plumb back will most likely have you more under the radar if that's what you want.