CruelNewb

From what I have been reading when the BOV releases air then the MAF sends data to the ECU thinking air is coming in and adds fuel in to the engine. The fuel goes directly out to the exhaust from the engine which causes the pop or flame. Does engine management stop this from happening or did I get this fact wrong? Someone explain this to me, I tried searching the forums but there were no definitive explanations. This is my understanding from reading so let me know.

invasion08

iTrader: (7)

The blow-off valve is a separate part that is supposed to be mounted in the intake plumbing between the turbocharger compressor and the throttle plate. Just like its name suggests, it blows off the pressure in the intake system of a turbocharged unit.

Secondly, its role. Such a system is specifically aimed at helping the turbocharged engine in question to maintain the same rev for a longer period (less than a second) when changing shifts. This way, the driver can get instant boost, reducing the lag and giving the optimal power just when needed. Other tasks include reducing wear of the engine and, more importantly for some people interested in tuning, creating a hissing sound generated every time the driver changes gears.

Getting back to the way the BOV works, it does exactly what its name suggests: it blows off the pressure in the intake system. This way, it keeps the turbocharger spinning when the throttle plate is fully closed. For example, when the driver wants to change gears and releases the throttle pedal. The direct result is that the turbocharger - which is still spinning thanks to the air flow - is ready to provide the optimal power once the driver presses the throttle pedal once again.

CruelNewb

From your explanation the valve actually doesn't trigger the ECU to inject more fuel since it's attached to the compressor?

I think i get the part where is relieves pressure to keep the turbo spinning.

05rex8

iTrader: (7)

recirculate the bov=no more pops

CruelNewb

You're talking to a dummy here. How is this archived?

05rex8

iTrader: (7)

route a hose from the bov (you will need an adapter) to the intake

05rex8

iTrader: (7)

here is a pic of a front view of my car to get a better idea
I used to have a pic that shows what it looks like recirculated, but I must have deleted it

CruelNewb

Ahhh ok... thanks a bunch

maxxdamigz

iTrader: (1)

Basically, when the BOV opens, it vents the intake. The turbo keeps spinning and pumping air through that goes out the BOV. All this air is being read by the MAF even though it never makes it to the engine. So say the Turbo is pulling 200g/s when the engine is only flowing 50g/s, 150g/s out the BOV (these numbers are just made up). The ECU injects for 200g/s and you get the flame. You recirculate the BOV into the intake track before the turbo, all the air the spinning turbo pulls is coming from the high pressure BOV flow. No new air is pulled through the MAF and the MAF reads a much lower number. Fuel injected is reduced.

Basically, any air coming through your MAF will have fuel injected for it. If you shoot air into the atmosphere, you will inject more fuel than your engine needs. If you keep the air in the system, you'll get a more accurate amount of fuel.

05rex8

iTrader: (7)

personally I like the pops and flames
keeps people from tailgating and scares people walking on the side of the road

CruelNewb

That was crystal clear thank you.

05rex8 - What the heck is that washer fluid container?

05rex8

iTrader: (7)

It's an AEM water/meth tank. I no longer have a windshield washer. Behind the PCM, under the strut bar is where I mounted the pump.

arghx7

There are piggybacks that can "clamp" the MAF signal during deceleration to prevent the backfiring.

Kane

iTrader: (1)

Or recirculate your BOV like you are supposed to and be done with it.

Phish806

iTrader: (4)

Just curious why you did not leave the winshield washer tank and just use it as your resivor. Also, why not jsut trunk mount the system and keep your windshield washer fluid. Or, just tap the stock tank and use it both for windows and meth injection. After all, washer fluid is meth/water. (granted only a few contain little to no detergent in them) anyway, jsut spitballing here. curious cuz i may go the meth injection route.

05rex8

iTrader: (7)

A few reasons:

1. Easier installation
2. The aem tank has a built in low fluid sensor
3. Tank is bigger capacity
4. I don't use washer fluid for the Meth system; I use snow performances boost juice
5. My car rarely sees bad weather; not even rain. I never used the washer fluid system anyway

If I were you I would definitely go for the water/Meth injection. IMO a boosted renesis shouldn't be run without one unless you go e85. Very wise investment.

05rex8

iTrader: (7)

Yeah but we are all ricers remember? I kinda am anyway LOL.
PPPSSSSSSSSSHHHHHHHH!!!!!

Phish806

iTrader: (4)

All good reasons. I do plan on going with the water injection, i also plan on going e85. The water/meth will get me by untill i switch the fuel system over. I still need to look at the benefits of water/meth injection on an e85 application. See if it will still be helpfull or if it could come off the car.

05rex8

iTrader: (7)

You wont need Meth with e85. I'd put the money towards the e85. I'd like to switch to that myself.

Phish806

iTrader: (4)

with the price of injectors, fuel rails, fuel pumps/filters, and a pressure regulator, $350 looks good for a meth kit to start with. I need to do some math and figure out what injector sizing i would need to meet my power goals and where to get said injectors.

blackenedwings

I vented to atmosphere once to see if there was a difference in drivability. I went on one drive, got home and immediately changed it back to recirc. There is a huge difference in throttle/turbo response between venting to recirc.

Yes, you lose the ffffshhhhh sound, but the car drives so much better its not even a question really. The turbo still sounds cool as hell anyway.

05rex8

iTrader: (7)

I didn't notice much of a difference at all in spool when I recirculated my bov