My car was dynoflash with a VTA BOV. If I recirculate it back to the MAS will I loose power. I saw a difference in power when doing this but wanted to confirm. So if I want to recirculate does this mean a new tune?

Anyone else dynoflash with a VTA BOV and try recirculating yet?

 

The issue with ATV vs. recirculaton comes into play when you lift the gas to shift - the air flwo sesnor measures the air you relase in the VTA bov so then your car gets real rich for a instant which reduces the spooling of the turbo

WE DO NOT suggest VTA bov's - although they will run equally bad with our reflash or any other tuning product or reflash

When you have a mass air flow sesnor a VTA bov is not a good idea - IMHO

BTW - my 667 whp evo uses a forge re-circulating bov

 

I understand and don't get me wrong. I love the turbo xs RFL and the turbo spool is great. It's the fluttering during partial throttle and surge that I hate. The problem with me is that I was tune with a VTA BOV and the car runs great. I decided to try to recirculate and instantly notice a decrease in power and was wondering if this was because the car was flash for a VTA bov. In order to recirculate the bov do I need a reflash?

I love the turbo xs rfl not because of the sound but it seems to spool up faster then the 1g or hks. I was wondering if anyone else dynotune with a VTA bov and then try to recirculate.

 

i feel the same way. it felt as if it lags more. i think it holds the boost better than the stock so that might be why it feels weaker.. with the rfl boost spike to 21 then to 19 to redline. with stock it would spike to 21 then to 16ish.. sux.

 

So do I need a reflash if I want to recirculate the bov?

thks

 

He dosen't recomend VTA.



Lets break it down. When you shift or let off the gas the BOV pushes air into the intake tube (after the mass air). The mass air automatically adds fuel to make up for the extra air that the BOV puts back into the intake tube. You take that air away, fuel is still added and your car stalls out.

 

NO - there is no tuning we offer for VTA bov's = you CAN use it - you will just have some driveability issues

 

if you want the best of both worlds, Go Fast Bits adjustable VTA / Recirc, you'll get the sound you want and still plumb most of the air in a recirc fashion.

 

agreed

 

Link ?

 

hehe, buy mine, I have an extra

https://www.evolutionm.net/forums/sh...&highlight=bov

http://www.gofastbits.com/index.php?...ion=stealth_fx

 

I think everyone misunderstand me. I was custom dynoflash tune with a VTA bov by you. The car pulls strong and turbo spool is quicj and I'm not complaining. I know the driviability of a VTA bov sucks. I tried recirculating the turbo xs rfl and also tried using a crushed 1g bov recirculating and in both case felt the car loss power so my question is it it because I was dynoflash with VTA bov that cause the power lost. Do I need to reflash in order to get the same power using a recirculating bov?

Thks

 

i have this piece of ****, and what ever i do, and trust me have tried every combination i cant get it to stop surging in fifth gear, the only thing good about it is that i does not want to stall the car out like other bov's.

 

Technically it shouldn't make a difference between the VTA and DV in outright performance. That is, if it is able to hold the same boost level and function the same on the vacuum port side of the valve in controlling the piston. Depending on the valve type you more than likely will notice a difference between the two in daily driving as there are some associations between idle issues and VTA's which will create a different driving feel of the car.
To add to something that was posted about air filling up the intake tube between shifts and adding fuel for this air that has been recirculated back into the intake tube behind the MAF. This is not the case. Between shifts, the throttle basically closes to minimize air into the engine. When the valve releases pressure, either to atmosphere or back into the intake, at the very instant following throttle closure you would be adding fuel that the MAF read the instant before the throttle closed, hence a slight rich condition. This rich condition is not necessarily related to where the positive pressure from the valve is being relocated but the fact that the maf read the airflow the engine was drawing in. Just because you relocate air from the pressure side into the intake tract doesn't solve the problem that the engine draws in the air it needs and with a closed throttle body it is not much. The problem with VTA's stems from the idle issues that are inherent with releasing metered air into the atmosphere such as sitting at a stoplight. The maf is reading airflow and dumping in the proper amount of fuel while some of the air is being released thru the valve further downstream so the engine is only getting partial air for the fuel it has added. This creates rich conditions and idle/stalling issues. Our VTA was designed with two pistons so that the primary piston acts like all other VTA valves and opens and closes under vacuum and boost conditions but the secondary piston is only acted on by positive pressure so the valve cannot be open at idle while the car is in vacuum and allows for the proper air/fuel ratios.

Dynoflash, if you would like to try one of these with your programming give me a call so I can get your feedback on it.

 

Thanks and that is what everyone seem to say but it makes a difference on my car. I recirculate it and the car seems to have less power/torque. Let it VTA and power comes back. Is this just my car or something else happen?

Anyone else tried doing this to verify if it makes a difference or not?