M35 Bov?

[iamhe77]

Have you checked for an exhaust leak at either end of the dump?

That's what it was for mine... and yes it sounded like it was "farting" as Scott repeatedly ribbed me for

[Aaron S]

can the grub screw mod be done to a standard car, or can this cause problems?

[scotty nm35]

Try it, you can always remove the grub screw later if you dont like it.

It can sometimes cause drivability issues at part throttle.

[zei20l]

it will make the engine appears to hesitate at low RPM. and youll get some flutter probably too

[Aaron S]

ok, i suppose i will give it a shot, if it will help with coming on boost earlier.

i was just more concerened about it casuing damage if not done with any other appropriate mods,

[WAGON_BOY]

ok, i suppose i will give it a shot, if it will help with coming on boost earlier.

i was just more concerened about it casuing damage if not done with any other appropriate mods,

as far as i understand it'll have bad effects on the turbo causing early failure............

[scotty nm35]

He doesnt want to block the BOV, just the bleed bypass hole to the side of it.

[jasevr4]

So blocking the hole is no worries for the turbo? Mine farts like a champ.

[scotty nm35]

The bov still works fine with the grub screw in, all its doing is bypassing air back to the intake so there isnt a huge pressure differential when the bov opens. My car ran fine with it plugged, it also held boost better and this would help the turbo last by bringing shaft speeds down. Why compress all that air then bleed it off if you dont have to, especially if you are trying to hold over 20psi.

Just run a 5mm tap into the 4mm hole and stick a grub screw into it.

(Wont fix farting noises, that would be either BOV piston seal or manifold to turbo gasket most probably)

[m35stagea]

where is it located so i can find it when i get the car back.. Cant see much in engine bay.

[m35stagea]

Technically once the grub screw is in and the hole is blocked you should be able to convert it to atmo?

I assume that the extra air bleeidng out is what f**ks the AFR and causes problems. With that fixed no need to plumb back..

[scotty nm35]

If you had some way of tuning the ecu you could try and take out the fuel dump when the bov opens, I think the Emanage can do that to some extent, otherwise no, the air is metered and needs to remain in the system.

Realistically any car with airflow meters can't run atmo, only map sensored cars can which is why the epa made it illegal.

[m35stagea]

But flames are fun!

[scotty nm35]

So is stalling constantly.

[Aaron S]

so do you no longer have it blocked scotty, or have you changed to an aftermarket setup?

is the factory turbo good for 20psi in your opinion?

is that as easy as fitting a wastegate bleed off valve on one of these?

[scotty nm35]

I'm running Aaron's Turbosmart Kompact with the stiff spring at the moment, its quite snappy when backing off but feels good none the less. The stock one was working fine with the grub screw mod but it could be due to the tune.

I ran 19psi on the stock turbo for 4 or 5 months, don't do it unless you are prepared to replace the turbo obviously, although I have a spare here.

To run high boost on the stock turbo, or any highflow version of it, you will need one of my modified actuators. That should hold around 15psi and allow over 22psi with a controller. Without the stiffer actuator it wont hold more than 14psi in the top end.

[Aaron S]

i think i will just leave it stock for now, might see what the grub screw mod does. i think an exhaust and dump is due before a new turbo.....lol

[ChrisB]

Has anyone actually figured out if this is a BOV problem?

I still have the exact same issue, and Im confident its something to do with the wastegate as you can hear it reverberate right through the exhaust. It literally sounds like its underneath you when driving. If you hold the throttle right when it happens you can make it fart as long as you want. I tried blocking my BOV and still had farts.

To me it sounds like the wastegate isn't opening properly or shuddering. It only farts under medium load. If i floor it it cannot fart - its like it opens properly then, but if im building boost up a hill slowly it happens most of the time....

Surely if it was BOV it would still fart when I floor it. It would fart at the same boost level everytime?

I want to fix this as it shits me!

Benny,

Did you get this sorted, your description is much closer to what my car is doing. Wastegate or BOV?

Chris

[scotty nm35]

Probably the t3 turbo gasket if it does it under boost, BOV if it happens on throttle roll off. It could also be a leaky intercooler pipe, they sound like you're blowing through a folded gumleaf too.

[Sticker Dude]

so i did the coke can mod tonight and seemed to get rid of the farting issue... How bad is it not having the blowoff functioning? Should i look into the grub screw mod?