GhostMercury
Member
- :
- MazdaSpeed 3 08.5
what other bov's you guys running
Hks Bpv
- Thread starter GhostMercury
- Start date
My understanding is that there is no chance of detonation from running rich because the excess fuel cools of the combustion chamber. But i will be the first to admit that i dont know as much as i would like to. What happens exactly?
I was under the impression that whilst running rich is not good for the car, its not exactly a horrible action either. I don't think our cars, running VTA, are running obscenely rich, but I'm still on the stocker so *shrug*.
speed3se-r
Member
After getting a functioning HKS ssqv, running it vta because i could not angle the bov to the recirc. hose correctly, and over the course of 1500+ miles in VTA and getting on it everytime i drive, i have not noticed any driving issues. MPG, stalling, bucking, backfireing etc, are non existent issues. Knowing as the ms3 runs pig rich from the factory, i've cleaned off my tailpipe as often as i can, and i can not tell any difference in soot build up, and it's actually probably a little less soot to be honest, but that could be due to the intake more so than the blow off valve. Point being, I do not think that it is causing a more "rich" mixture between shifts, and if it is, i do not think that tiny bit of running rich is going to hurt that much, considering how rich the ms3 comes from the factory. Other than using my tailpipe as a way to test, I would need a wideband to confirm.
I think also that why people or the factory uses a recirc hose is the same reason why some cars have air intake resonators on their cars...to be quiet. Also, the way the hks is designed to work, the valve relies on the boost pressure to keep it shut and sealed. Most blow off valves, like the factory valve, even though difficult to push up, are already cracked open from the vacuum. If you run that in VTA, with a MAF equipped car, then that would be the same a having a loose vacuum line some where on the intake because air is entering the engine from an unknown source not metered by the MAF, and you will notice some idling issues and such.
From a performance standpoint, the air vented by the blow off valve in recirc. forces the turbocharger to keep spinning in a positive direction and between shifts. The turbocharger is already kept spinning faster and is ready to spool up, vs. VTA where once the throttle is closed, the turbo is forced to slow down, only to be accelerated by the exhaust. But just that split second could make a lot of difference. Just my opinion...
I think also that why people or the factory uses a recirc hose is the same reason why some cars have air intake resonators on their cars...to be quiet. Also, the way the hks is designed to work, the valve relies on the boost pressure to keep it shut and sealed. Most blow off valves, like the factory valve, even though difficult to push up, are already cracked open from the vacuum. If you run that in VTA, with a MAF equipped car, then that would be the same a having a loose vacuum line some where on the intake because air is entering the engine from an unknown source not metered by the MAF, and you will notice some idling issues and such.
From a performance standpoint, the air vented by the blow off valve in recirc. forces the turbocharger to keep spinning in a positive direction and between shifts. The turbocharger is already kept spinning faster and is ready to spool up, vs. VTA where once the throttle is closed, the turbo is forced to slow down, only to be accelerated by the exhaust. But just that split second could make a lot of difference. Just my opinion...
Drag Limited
Member
While short term i'd rather run rich 100 times before i'd let my car run lean, from my understanding the fuel when not able to fully brun "washes" the cylinder walls of their lubricant (scant I know but there is oil there) and prematurely wears the piston rings. First it's mild blow-bye then you will find yourself adding a quart of oil in between oil changes and a nice blue smoke screen while driving around. The worst case would be complete loss of compression in any given cylinder.
Now with all that said, sorry for any grammer errors, and lack of actual tech names for these processes but i've seen them happen and dont want you guys hurting yourself in the long run.
My suggestion is get a nice tune or re-flash somewhere, heck some of the BMW 335i drivers have actually gained gas mileage with their re-flashes (after market companies dont care about emissions and thus can make a car get better gas mileage and still add HP)
Another option is drive it like it is, get a test pipe (straight pipe) and get the EGT's up really high and shoot a ton of flames around town
GhostMercury
Member
- :
- MazdaSpeed 3 08.5
speed3se-r
Member
That is if you get a blow off valve that is similar in design to the factory or is non adj. The hks unit seals itself using the boost pressure, so it will stay close, even though vacuum is applied to the diaphragm. You should be ok with the hks unit in vta.
I personally have the TXS hybrid BOV that runs in rec. mode under normal throttle but changes to VTA under WOT. It sounds great! Its a much deeper and pronounced sound then the HKS. My friend has the HKS BOV on his GTI and it sounds really good, i just personally prefer the sound of this valve.
I will have a pop every once in a while (1 or 2 in a months span) but other than that I have had zero issues. No stuttering or misbehaving in the least. I have it tuned as well with the CPE Standback. CPE has developed a option to cut fuel off between shifts on the standback specifically for BOV's running strictly in VTA mode.
GhostMercury
Member
- :
- MazdaSpeed 3 08.5
you have a link to the hybrid
