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Old 06-10-2013, 09:11 PM   #1
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Default BoV vent to atmosphere Q's

Hey all,
I'm new to MAP sensor type engines so I have a few questions regarding venting to atmosphere BOV & AFRs. With older style MAF equipped engines the sensor is on the turbo inlet so venting to atmosphere on a MAF would produce a super rich AFR mixture, so what's the deal with MAP sensor since the sensor is right before the TB? Will it produce rich AFRs when venting also? It doesn't seem like it would because its not expelling accounted air since it hasn't been metered yet.

I plan on getting the AGP bov adapter for stock location and I have an HKS bov. I want to know this because rich AFRs = poor gas mileage.


Thanks for your input.
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Old 06-10-2013, 09:49 PM   #2
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I am pretty sure when i let off the throttle it goes rich for a split second. But I stopped paying any attention to it a long time ago. Three years ago when I added the BOV I have currently on the car it didn't make any difference to the gas mileage. Its always dependent on if you are in constant boost going from light to light during city driving. Even with the stuff I have now if I granny shift and stay out of boost I make 21-23 MPG in the city. The first MAP sensor is on the cold side piping right before the TB. I have my BOV right after the first MAP sensor but before the TB.
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Old 06-10-2013, 09:58 PM   #3
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Thanks for your quick response! I'm glad it will not affect gas mileage. I am going the route I am because I want to keep the stock IC pipes even when I do purchase an aftermarket FMIC core.

My car is completely stock and Im not even seeing 21-23MPG city driving and I drive like a granny shifting at around 2700-3000 RPM. I can only manage 300 miles per FULL TANK when the gas light comes on.
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Old 06-10-2013, 10:17 PM   #4
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I stopped caring about gas mileage a while ago. Only when I go on 2+ hours of driving do I feather the throttle and super granny style shift. Do you have a AFR Gauge and a Boost Gauge in your car?
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Old 06-10-2013, 10:46 PM   #5
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Quote:
Originally Posted by ragchaos View Post
I stopped caring about gas mileage a while ago. Only when I go on 2+ hours of driving do I feather the throttle and super granny style shift. Do you have a AFR Gauge and a Boost Gauge in your car?
I do not have a wideband installed due to the fact that I'm completely stock. If I do start modding and upping the boost I most certainly will get one. I will be connecting torque to my 7" tablet very soon as well so I can have a digital readout of my psi/vac as I'm not a fan of gauges in this clean new interior. Lol I'm coming from a 1995 Nissan 240sx Kouki that had an RB25 in it so all this is super neat and up to date for me and I'm not willing to do things to it yet ha!

Do you recommend a certain spark plug? If so what heat range and what gap is usually best ?
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Old 06-11-2013, 04:27 AM   #6
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Stock you won't find a better plug than the OEM Denso. Only after adding +100 HP should you look for a different heat range.
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Old 06-11-2013, 06:38 AM   #7
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Stock you won't find a better plug than the OEM Denso. Only after adding +100 HP should you look for a different heat range.
+1 I haven't had to change my plugs yet. Just the gap. Although I do have a set of NGK 1 step colder than stock for later on.

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Old 06-11-2013, 10:29 AM   #8
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Quote:
Originally Posted by Red Raspberry View Post
Stock you won't find a better plug than the OEM Denso. Only after adding +100 HP should you look for a different heat range.
Awesome that is great info, thank you for that.
I'm going to sound like a n00b here but do you have a part # on those spark plugs? Are they only able to be acquired from the dealer?


EDIT:
Found them lol sorry for that.
FK20HQR8
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Old 06-11-2013, 11:54 AM   #9
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hey check out socal genesis on facebook, everyones local on there
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Old 06-11-2013, 08:48 PM   #10
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hey check out socal genesis on facebook, everyones local on there
Cool man will do!
Thanks
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Old 06-12-2013, 06:20 AM   #11
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Why would you keep the stock flex pipes even after upgrading the core? Rubber and mesh isn't that great for trying to build boost.
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Old 06-12-2013, 08:45 AM   #12
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Quote:
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Why would you keep the stock flex pipes even after upgrading the core? Rubber and mesh isn't that great for trying to build boost.
I'm not going to be boosting crazy #s or upping the boost at all. a FMIC is all I will be doing engine wise
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Old 06-12-2013, 01:08 PM   #13
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Tyr is right. Every time you boost those flex hoses expand. That is robbing you engine of boost. Switch to hard pipes and you will most likely find your boost rising much quicker = more power / better response = more shits and giggles
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Old 06-12-2013, 08:03 PM   #14
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Quote:
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Tyr is right. Every time you boost those flex hoses expand. That is robbing you engine of boost. Switch to hard pipes and you will most likely find your boost rising much quicker = more power / better response = more shits and giggles
I want a stock look.
Again, I'm not going for more boost or more power at all. For me the FMIC is just for better cooling as the stock one sucks fat weenie. I didn't want to spend $300 for a pipe kit.

Thanks for your input
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Old 06-13-2013, 04:26 PM   #15
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Fair enough. Mod money does not grow on trees. Do you drive your car very hard? If so a oil cooler might be a good next mod in the scal heat.
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Old 06-13-2013, 04:55 PM   #16
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its up to you but i believe my hard piping made a much bigger difference than changing my fmic to a precision/garrett core. I felt a very nice throttle response and overall power boost.
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Old 06-13-2013, 09:31 PM   #17
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Fair enough. Mod money does not grow on trees. Do you drive your car very hard? If so a oil cooler might be a good next mod in the scal heat.
Honestly not at all ! I drive it like a granny and never rev over 3k RPM's.
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Old 06-14-2013, 03:49 AM   #18
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If you never break 3k you didn't need an upgraded FMIC. the stock one is actually very good. The problem is that its so far back. If you spend a lot of time idling it will heat soak, but as soon as you get the car moving the IAT will drop to normal temps. A bigger FMIC won't buy you any more cooling while the car is stationary. It will only make a difference under hard turbo use.
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Old 06-14-2013, 05:24 AM   #19
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Quote:
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Honestly not at all ! I drive it like a granny and never rev over 3k RPM's.
With all due respect...why buy a turbo 4cyl if this is the case?
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Old 06-14-2013, 05:45 AM   #20
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On a MAP sensor equipped engine venting to atmosphere has no bearing on A/F mixture. If the A/F ratio goes up, it does this on a recirculating setup as well.

Keep in mind that depending where you mount your bov (hot side/cold side) will affect how quickly you will build boost.

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