Bov Modification On Tomei Poncam Instructions

[satanic]

Hi all,

Planning to put some Type B Poncams in very shortly and just going through the instructions that are in Japanese. There is this whole section on a modification that you have to do to the BOV - unfortunately in this case, pictures don't tell a thousand words and I'm quite confused.

Has anyone done this or has any idea what is required?

Any help would be great,

Thanks

Stan

[mad082]

pics of instructions? is it for the stock bov? could it be blocking up the recirculation hole of the stock bov?

[satanic]

Yes it's to do with stock blow-off valve! And it did show instructions to block up "some" hole, not sure which one though.

On the diagram it's very tiny.

I'll try get the pic up sometime soon.

[Busky2k]

Oh yeah the stock BOV trick. Basically you pull it apart into halves and you'll see a small hole to the left of the piston. Jam a screw or something else to plug it up and then reassemble. Stops it from 'leaking' apparently.

[mad082]

here's a pic of before and after.

Edited September 18, 2006 by mad082

[mad082]

the hole is a recirculation hole. air constantly flows through it and back through the plumback pipe, even when boosting.

[satanic]

Cheers to everyone who has helped, you've been fantastic, especially to the guys with photos

Now, what if I don't have a BOV anymore (completely removed, blanking plate used instead). Does it mean that I don't have to worry about this?

[mad082]

no, just block it off.

[satanic]

Sweet, that's what we've done, thanks for your help!

[mad082]

so why are you running no bov?

[satanic]

Some little experiment the boys did to generate some flutter sound... nice little party trick it seems

[yogi000]

so is this modification worthwhile?

does it harm you turbo at all???

[mad082]

slows the turbo down on gear changes, creating more lag.

[satanic]

Yes, that is what I'm experiencing... I'll even go as far to say that it feels like someone's applying the brakes when I back off the throttle or change gears.

[justin911]

ive had the little hole in my bov blocked for like the last yr...

havnt noticed any extra lag or anything you guys are describing..

If anything it seems to spool a few 100rpm quickier since doing it..

[mad082]

i didn't have mine blocked up for long enough to find out if it was lagging. i just saw the boost drop so i took it back out. i'm going to go to an aftermarket bov soon so it doesn't matter.

[benl1981]

Old thread revival but..

Satanic - do you have the instructions still from Tomei showing this mod.

I have done it and the car feels a lot more responsive. However It doesn't seem the BOV is functioning as it's intended after this mod according to what Ive read