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R-33 Must Be Tuned To Fit Atmospheric Bov?

blitz r33
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blitz r33 Collaborator

blitz r33

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post-40900-1197245426_thumb.jpg

i know that this has been covered alot but ive been told this and that about i have to get a aftermarket ecu and tune it to fit a atmospheric bov cause the factory one is only tuned for the re-circ bov.

i just rang coffs harbour dyno and tuning services and the main man there told me i dont have to get a tune to fit a bov and i told him about the stalling and he told me its either a leak or a blockage.

a little while ago i was having idle problems and stalling even with the factory bov back on and my mate found the forum on here about the aac valve and mine was putrid and after it was cleaned out its been running perfect and my power is back.

could that aac valve been causing the problem?

well that leaves the question...does it have to be tuned or not?

cheers.

Edited by blitz r33
blitz r33 Collaborator

blitz r33

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me and a mate just installed the bov and took it for a quick test drive and had no issues yet.

when i put it on before pretty much straight away at was rev hunting and stalling but not this time???

i will take it for a better run later and see how it goes.

r33cruiser Grand Master

r33cruiser

Posted
Posted

no mate. been runnin my ssq for 1yr no probs.

get a hks ssq bov. it is a pull type piston (wateva that means) and is virtially impossible to leak.

i noticed in your pic that u are using a vee port type piston bov. THAR'S YOUR PROBLEM. UPGRADE TO A SSQ BOV.

blitz r33 Collaborator

blitz r33

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  • Author
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no mate. been runnin my ssq for 1yr no probs.

get a hks ssq bov. it is a pull type piston (wateva that means) and is virtially impossible to leak.

i noticed in your pic that u are using a vee port type piston bov. THAR'S YOUR PROBLEM. UPGRADE TO A SSQ BOV.

will do thanks for the info.

can you let me know the price for one?

Spunky Munky Grand Master

Spunky Munky

Posted
Posted

No, you don't have to necessarily get your whole car tuned just for a ATMO... the Atmo aka atmospheric BOV is a funny one.... on nearly 80% of Skylines it will cause bad stalling issues... as it plays with the AFM or something and your car will just shut down... I would recommended a plumb back on where the discharge is plumbbed back into the engine... as this is the way it was designed...

But if you want a HKS SSQV - buy mine - it's the latest one, I'll sell it to you for $150 plus postage.

PM me if you're interested otherwise good luck.

r33cruiser Grand Master

r33cruiser

Posted
Posted

go on ebay man. i just have the copy. hasnt stepped wrong. had it apart a few times and is all sweet. make sure u dont adjust the spring tho just leave it. costs about 100+ including adapter

pixel8r Mentor

pixel8r

Posted
Posted

I dont know all the theory but its something to do with the magic the stock ecu does when it knows air is being plumbed back into the intake (ie. from the stock BOV) - so it works out the mixtures based on that air being available on top of what the AFM is reading...

So if its calculating this extra airflow and its not there (as with an atmo bov) then its gonna be stuffing up your mixtures. Aside from the stalling, you'll also notice that even on cars that dont stall, the fuel economy will suffer a bit with the atmo bov compared to the stock one. Its the same reason - your stock ecu cannot accurately get the air/fuel mixtures right if you have an atmo bov.

You can take the word of this tuning place or you can take the word of 80+% of the guys on here who have had the same issues as soon as they installed a bov that vents to atmosphere. swap it back for the stock one and the problem disappears...

Ask yourself it its worth the trouble and the cost of an aftermarket ecu + tuning.

joeyjoejoejuniorshabadoo Grand Master

joeyjoejoejuniorshabadoo

Posted
Posted

I know what you're thinkin...

did it stall 6 times or only 5?

well to tell ya the truth in all the excitement i kinda lost count myself...

so you gotta ask yourself one question...

am i fully sikk enough?

well are ya punk?

blitz r33 Collaborator

blitz r33

Posted
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I know what you're thinkin...

did it stall 6 times or only 5?

well to tell ya the truth in all the excitement i kinda lost count myself...

so you gotta ask yourself one question...

am i fully sikk enough?

well are ya punk?

actually none!

ive been driving it all day and it hasnt stalled once.

and am i fully sikk enough? and well are ya punk? is two questions not one.

joeyjoejoejuniorshabadoo Grand Master

joeyjoejoejuniorshabadoo

Posted
Posted
actually none!

ive been driving it all day and it hasnt stalled once.

and am i fully sikk enough? and well are ya punk? is two questions not one.

so here we are... The part where no one knows dirty harry and i feel old enough to break a hip :banana:

RBwhatever Veteran

RBwhatever

Posted
Posted

It'd be best to get it tuned. You'll probably/most likely have a bit of overfueling happening.

Do you get a bit of a pop out of the exhaust on gear changes etc?

Unless you get it tuned, it'll make your car even more of a fuel muncher.

Spunky Munky Grand Master

Spunky Munky

Posted
Posted
I dont know all the theory but its something to do with the magic the stock ecu does when it knows air is being plumbed back into the intake (ie. from the stock BOV) - so it works out the mixtures based on that air being available on top of what the AFM is reading...

So if its calculating this extra airflow and its not there (as with an atmo bov) then its gonna be stuffing up your mixtures. Aside from the stalling, you'll also notice that even on cars that dont stall, the fuel economy will suffer a bit with the atmo bov compared to the stock one. Its the same reason - your stock ecu cannot accurately get the air/fuel mixtures right if you have an atmo bov.

You can take the word of this tuning place or you can take the word of 80+% of the guys on here who have had the same issues as soon as they installed a bov that vents to atmosphere. swap it back for the stock one and the problem disappears...

Ask yourself it its worth the trouble and the cost of an aftermarket ecu + tuning.

This is exactly what I said... if you wanna get an atmo BOV - nothing wrong with that - get yourself an aftermarket ecu like an Apexi FC and spend $450 on a tune not to mention the $1,300 on the FC... or just take the god-damned BOV off at put your stock on or one that plumbs back into the engine back on.... your call... I've decided to go back to the stockie... runs nice and fuel economy is better too....

blitz r33 Collaborator

blitz r33

Posted
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This is exactly what I said... if you wanna get an atmo BOV - nothing wrong with that - get yourself an aftermarket ecu like an Apexi FC and spend $450 on a tune not to mention the $1,300 on the FC... or just take the god-damned BOV off at put your stock on or one that plumbs back into the engine back on.... your call... I've decided to go back to the stockie... runs nice and fuel economy is better too....

thats only if your car stalls,but it would be good to get a after market ecu and a tune if you would like to go more boost and get a few mods done.

it must have been the aac valve on my car cause ive been driving it for 3 days now and not a problem.

Spunky Munky Grand Master

Spunky Munky

Posted
Posted
thats only if your car stalls,but it would be good to get a after market ecu and a tune if you would like to go more boost and get a few mods done.

it must have been the aac valve on my car cause ive been driving it for 3 days now and not a problem.

That's right mate... if it works fine then I wouldn't worry...

If you can afford it, I would definitely recommend a tune.

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