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Madison Motorsports
vacuum hoses connected to fuel injectors?!? - Printable Version

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+--- Thread: vacuum hoses connected to fuel injectors?!? (/showthread.php?tid=8637)

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Re: vacuum hoses connected to fuel injectors?!? - .RJ - 12-17-2009

ViPER1313 Wrote:Word.....

Why not leave it hooked up though - vacuum hose is cheap and it will make you car get better fuel mileage...

AND THINK OF TEH BABY POLAR BEARS!!!!!!!!!

Re: vacuum hoses connected to fuel injectors?!? - BLINGMW - 12-17-2009

yeah.... this car isn't going to be doing much low load, low RPM operation, so I'm not too worried about it Tongue Heck, even cruising on the highway, I bet this system is pretty much doing nothing. And besides, does it do anything at all once you're in closed loop operation? I would think the O2 sensor would mostly be in charge anyway, so maybe this is only to keep emissions down during warmup? Screw that, that won't kill THAT many polar bears. Ok, MAYBE a baby one with a respiratory disorder or severe infection, but that's natural selection dawg. Who am I to play god? :dunno:

Re: vacuum hoses connected to fuel injectors?!? - Maengelito - 12-17-2009

well unless you use polar bear meat to plug up those holes...

Re: vacuum hoses connected to fuel injectors?!? - ViPER1313 - 12-17-2009

I just don't see the benefit to capping it off :dunno: , only the possible problems (rough idle, low RPM hesitation, poor gas mileage, etc...) I'm not saying that it makes a huge difference, but why not hook it up the way it's supposed to be?

Re: vacuum hoses connected to fuel injectors?!? - Mike - 12-18-2009

ViPER1313 Wrote:I just don't see the benefit to capping it off :dunno: , only the possible problems (rough idle, low RPM hesitation, poor gas mileage, etc...) I'm not saying that it makes a huge difference, but why not hook it up the way it's supposed to be?

+juan.

Re: vacuum hoses connected to fuel injectors?!? - Steve85 - 12-18-2009

D_Eclipse9916 Wrote:
Steve85 Wrote:The proper way is to have it all hooked up, its not just for emissions, partly is though. The correct way would be to have 2 catch cans for both the breather hoses, and the PVC. However, you want pretty strong vacuum, so many racers have actually put vacuum pumps in to help get rid of crankcase pressure, making more power.

Yeah, here's the vac pump setup I had on the 434. It helps with performance and engine sealing, both fluids and ring seal. In this scenario, you actually seal off the crankcase, no fresh air feed. The polished piece on top is the regulator.

My problem with this setup was that it would blow oil out of the breather tank filter. The thing is heavily baffled but it still did it. It's OK for a 1/4 run but the engine was coated in oil after a 20 minute session.

[Image: IHNUU-SC50%20%282%29.JPG]

[Image: WDKBF-SC63.JPG]

Quote:I just don't see the benefit to capping it off , only the possible problems (rough idle, low RPM hesitation, poor gas mileage, etc...) I'm not saying that it makes a huge difference, but why not hook it up the way it's supposed to be?

A few bucks worth of hose and a few minutes, I agree.

forget the polar bears..think of the children, for garsh sake would somebody please think of the children!!!! ICE/EPA/CARB will tow your vehicle because it represents a danger to the public.

Re: vacuum hoses connected to fuel injectors?!? - BLINGMW - 12-18-2009

ViPER1313 Wrote:only the possible problems (rough idle, low RPM hesitation, poor gas mileage, etc...)

Guys, it's capped off RIGHT NOW and I'm experiencing none of those issues. So I guess it's just a difference of opinion. Some people like to have things "right" even if it costs them some extra time and money. I'd likely have to remove the top of the manifold to replace those hoses. I like to have things functional and simple. I can always fix it later if for some reason I find it's causing problems. The factory did something dumb and I'm unfucking it and saving money. Win-win-win!

Re: vacuum hoses connected to fuel injectors?!? - ViPER1313 - 12-18-2009

BLINGMW Wrote:
ViPER1313 Wrote:only the possible problems (rough idle, low RPM hesitation, poor gas mileage, etc...)
Some people like to have things "right" even if it costs them some extra time and money.

I think that pretty much sums me up :dunno: Glad its working better now though :thumbup:

Re: vacuum hoses connected to fuel injectors?!? - Dave - 12-18-2009

Both camps have valid points. I don't mind spending money to fix or improve something, but I also try to keep things as simple as possible. In this scenario, Channing has found that by removing the system, he is experiencing no ill effects and has simplified a system which was over engineered by the factory, all with virtually no expense.
Maybe after he does a tune up or puts some miles on the car he'll start to experience some negative effects, in which case he can revisit this part of the engine management and consider going back to factory. I know I've removed a lot of stuff from a lot of cars in the name of simplicity...

Re: vacuum hoses connected to fuel injectors?!? - Mike - 12-18-2009

channing, i have great respect for you, but none of us here are smart enough to design engines for bmw (unless we're talking about that POS that was in the e46 m3).

Re: vacuum hoses connected to fuel injectors?!? - BLINGMW - 01-07-2010

Mike Wrote:channing, i have great respect for you, but none of us here are smart enough to design engines for bmw (unless we're talking about that POS that was in the e46 m3).

Dang, I didn't redesign the engine! :lol: :roll:

Anyway, three weeks later, no ill effects, no codes thrown or anything, fuel economy is unchanged as far as I can tell. That mod + an aFe filter and I have like at least 100 more HP. :thumbup: :dunno: The population of polar bears and baby seals around my immediate area is also unchanged as of yet.

Re: vacuum hoses connected to fuel injectors?!? - Mike - 01-07-2010

Engine designer, ballistics expert... What will he do next!?

Re: vacuum hoses connected to fuel injectors?!? - BLINGMW - 01-07-2010

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Re: vacuum hoses connected to fuel injectors?!? - HAULN-SS - 01-07-2010

[Image: hole%20in%20the%20ground.JPG] ?