well from what i have heard if u put a bov and tt 300zx it can introduce turbo lag is this true??? and if so is there a way to stop the turbo lag???
i take it your new to the forums....welcome to the best place on the net the vic boys will take care of ya no worries as for your Q: i recently installed bovs and have not noticed any lag at all cheerZ
haha yeah how did u no??? ah ok cause im in the process of buying my 300zx and the only thing its missing is a bov but now u have said that its not missing anything cheers.
and remember its not just A BOV, you need 2 of them , when i bought my car some dickhead decided to put 1 BOV on up the top leaving the 2 factory ones down front so i had 3 all fixed now
There are two schools of thought on this. 1: Recirc valves are better than blow off valves up till the point where they aren't suitable for the horsepower of the car. >600hp. (Greg Dupree of SpecialtyZ (9 second Z)) 2: Blow off valves reduce the lag between shifts but make gay noises (Nixit - knowledgeable member from ttnet.) IMHO, you're not gonna know the difference regardless of which you choose besides the noise. Do you want noise or do you want it to be quiet?
Correct me if I'm wrong cause I may well be. But I read somewhere that BOV's on a zed actually decreased the performance. The reason for this is that by expelling the air instead of recirculating it you are confusing the ECU. The ECU thinks there is more air in the system than their really is and thus adds too much fuel making the mixture rich. Whether the difference is noticeable I have no idea.
For those that don?t know a bov vent air from the intake that is already be pressurised by the turbo. if you change gear or took ur foot of the accelerator when on full boost the system need to vent the excess pressure form the system or you would get boost spikes. the reason why is that when you do as I said you almost completely close the throttle (i.e. very little air can get in to the motor) but because the way a turbo works (you use the exhaust gasses to boost the intake pressure) they still make boost after the throttle has closed so all of a sudden you have a lot of pressure and no where for it to go. Suddenly you are no longer running 10psi you now have spiked to 20psi in the intake and if you didn?t have a bov to vent the air it will find a way out witch is normally back through the turbo. if you don?t blow a hose off, the main thing that happens is as the air rushes back out through the turbo and it stalls (stops spinning) or even spin backwards (very no good). this air pressure can hit the turbo wheel with some serious pressure and I have seen it damage the compression wheel in the turbo. So it doesn?t matter what bov you have you just gota have one (or in the 300zx case 2 ) Atmospheric bovs don?t affect the performance that much the biggest let down of the atmospheric bov is that when it vents to the atmosphere the ECU still thinks that air is going to go in to the motor so it puts in the fuel to get the balanced mixture but because there is less air it runs super rich for 1 or 2 seconds you will see this when following a car with bovs on high boost it ether blows a big cloud of black smoke or shoots flames (I recon the second is cool ). the advantage of having atmospheric bos is that it vents the air quickly so the turbos don?t slow down as much and when you come back on boost it takes less time to spool up again. They all so create very little turbulence to the intake line unlike a reticulated bov that vents back into the intake after the AFM and befor the turbos and can create turbulence in the system I hope that make sense Sorry for being so long winded And if I got anything wrong please correct me
You forgot to say that BOVs that vent to atmoshere sound much cooler than recirculating types (if your into that sort of thing)
Aggree with buz1986 except that its the maf that gets fooled, and sends the wrong signal to the ecu, which then dumps the wrong amount off fuel in. There's an easy fix for that. Get an afc.
