Misfiring between gear changes, BOV is vented to atmosphere, is that why?

[JDMSIL80]

So Ive been trying to figure out why my car would misfire terribly during quick upshifts.

When I change gears and stomp on the throttle quickly (during the BOV venting), the engine would bog down and misfire for a good few seconds, then it will pick up power and becomes smooth.

Now if I change gears and put the throttle down gradually or slower (just after the BOV vented), there will be no misfire and upshift would become smooth.

This kinda bothers me because I cannot shift aggressively and ruin the whole experience if you track the car.

I'm running ARC BOV, with comes with the horn that does not allow re-circulation of the air.

I recently changed my ecu from Power FC back to stock with Horsham Stage 3 chip. Car is running much faster now with this chip, mainly because my map wasn't tuned on the PFC.

But strangely, the misfiring didn't really happened with I had the PFC, only now with the chipped ecu it started on me.

Does it look like I need another BOV that allows me to recirculate? Does anyone else has this problem with open-air BOV?

[tyrannix]

if you reread Dees sticky, it says pretty much that, venting a BOV on a stock ECU can cause headaches, probably applies to a chipped stock ECU as well

my reccomendation would be stick the PFC back on and get a wideband and/or some dyno time to fix that map

but then again, i put a decepticon emblem on my engine, so you cant trust a word i say

CJ

[rico05]

When I ran an ARC Type 3, it would buck and pop on shifts. The ARC valves really do not like to be vented.

FYI, my new HKS SSQV vents flawlessly after a little setup trial and error.

[TurboFortysx]

You want to sell the Power FC?

[JDMSIL80]

Yah the ARC is causing too much problem when venting, misfiring or cut out all over the place.

Im actually planning to get the HKS SSQV as well, together with the adaptor that allows me to recirculate.

So you are able to vent the HKS without any problem? I notice the SSQV has changed to new design that is no longer adjustable, don't know if this is necessary in my case.

I thought about going with the HKS Racing Type II BOV, but it seems too aggressive on a CA since it can hold up to 3 bar/800hp. I'm planning to run 12psi daily and 17psi max.

When I ran an ARC Type 3, it would buck and pop on shifts. The ARC valves really do not like to be vented.

FYI, my new HKS SSQV vents flawlessly after a little setup trial and error.

[dvd]

hrmm when i had my sheepdog bov vent to atmo. i didnt really have any missfire. But now that i have a intake with a recirc valve, you can smell gas everytime you shift Maybe I have a leak between the bov and the recirc valve because i had to ghettofy a 90degree adapter =x

[boost_boy]

Yah the ARC is causing too much problem when venting, misfiring or cut out all over the place.

Im actually planning to get the HKS SSQV as well, together with the adaptor that allows me to recirculate.

So you are able to vent the HKS without any problem? I notice the SSQV has changed to new design that is no longer adjustable, don't know if this is necessary in my case.

I thought about going with the HKS Racing Type II BOV, but it seems too aggressive on a CA since it can hold up to 3 bar/800hp. I'm planning to run 12psi daily and 17psi max.

Dude, I don't know your financial status or your mechanical knowledge, but judging from your posts over the past, you need to pay someone to set your car up for you. There are a bunch of warnings set-up on this forum to prevent you guys from foolishly throwing away your money and not even having a "so-called" perfromance vehicle that's worth driving. I'll reitterate this from the sticky "Venting your BOV on a MAF-based system is bad"! I do it on my boosted Hyundai and it gets pissed at me and dump fuel like crazy, but I can't complain about it because I know better and I do it anyway.

Take the time to read and you'll see that there's a better way of going about things than the way you are doing it. If you guys who chose not to read the valuable information displayed on this very public forum, then your failure is your problem . I'm sure members don't mind helping you guys out, but I continue to see the same people with massive issues and though I can probably easily give a solution, but I prefer you newbies and guys who are new at this turbo thing, to do the leg-work and learn your objective.

Remember this guys/girls, there's no skating up-hill without putting forth some effort . And you all can take this for whatever it's worth.

Dee

[JDMSIL80]

So I found the problem!

It is infact the ARC BOV, I tried running the car without the vacuum line connected preventing it from venting. Took the car out for a spin in high boost, the misfire between gear changes has went away!!

I bought the this BOV long time ago, and it was one of the first mod on the car. Too bad its not designed to be recirculated.

I'll be trying out the HKS SSQV instead, hopefully it will run well.

Thanks guys!

[uno]

Another option you may have not considered. Instead of buying a new bov, spend the same money on an safc-2 it has an option in it to run the bov vented and prevent the rich condition (decel function)the ecu would normally cause. I run the greddy type rs vented on stock ecu+ safc2. SAFC will also come in handy when you upgrade mafs and injectors.

[JDMSIL80]

I already Z32 MAF and 444cc injectors, the stock ecu has been chipped with Horsharm Stage 3 to run with this setup.

I also have Apexi Power FC, which is a complete standalone, that I will put in eventually. However, it still requires MAF in place so I would need to recirculate the BOV anyhow.

Another option you may have not considered. Instead of buying a new bov, spend the same money on an safc-2 it has an option in it to run the bov vented and prevent the rich condition (decel function)the ecu would normally cause. I run the greddy type rs vented on stock ecu+ safc2. SAFC will also come in handy when you upgrade mafs and injectors.

[tyrannix]

since i had fun redoing my whole harness anyway, im thinking of trying the s14 SR d-jetro powerfc to swap to MAP... but megasquirt is really cheap... gotta see how i like teh CA pfc first tho

I already Z32 MAF and 444cc injectors, the stock ecu has been chipped with Horsharm Stage 3 to run with this setup.

I also have Apexi Power FC, which is a complete standalone, that I will put in eventually. However, it still requires MAF in place so I would need to recirculate the BOV anyhow.

[uno]

I still have a maf setup and i vent the bov with no stumbling, etc thanks to decel function. I'm sure the power fc has it. Also if you run blow through mafs setup, you don't have to worry about venting the bov and going rich either. Because it's not accounting for air that isn't there anymore with a blow through maf setup. So there's two options unless you're really set on recirculating.

I already Z32 MAF and 444cc injectors, the stock ecu has been chipped with Horsharm Stage 3 to run with this setup.

I also have Apexi Power FC, which is a complete standalone, that I will put in eventually. However, it still requires MAF in place so I would need to recirculate the BOV anyhow.

[JDMSIL80]

The only thing to consider is the basemap from SR would probably be somewhat different, you mean need to tune it just to get it idle.Otherwise, the tunning from then should be relatively the same.

Im considering to buy the FC datalogit for my CA PFC, that way I can tune via labtop.

since i had fun redoing my whole harness anyway, im thinking of trying the s14 SR d-jetro powerfc to swap to MAP... but megasquirt is really cheap... gotta see how i like teh CA pfc first tho

[Nunook]

i have a hks ssq( without the adjustment ) and it works pretty good. i get just a little rpm drop, when i stop at the light. Other then that its ok.

Also personally I wouldve kept the pfc, and had someone tune it. Im sure there are a couple ppl on here that could've done it for u. maybe with alittle payment and a couple beers?

[JDMSIL80]

Great to hear the HKS SSQV (newer version) is working out for you, I did some research and found it to be one of the most reliable BOV you can get.

I still have my PFC, saving it for my future buildup once I'm tired of my GT28R

i have a hks ssq( without the adjustment ) and it works pretty good. i get just a little rpm drop, when i stop at the light. Other then that its ok.

Also personally I wouldve kept the pfc, and had someone tune it. Im sure there are a couple ppl on here that could've done it for u. maybe with alittle payment and a couple beers?