Atp Ves - Mazda 6 Forums : Mazda 6 / Mazda Atenza Forum

sbspeed · 10-22-2007, 09:26 PM

For those of you that don't know what an ATP VES is - it's a boost actuated exhaust dump. The valve opens at 10psi and dumps the exhaust. Anything less than that, the exhaust will flow through the stock exhaust (or whatever exhaust is in place)

We all know that the best performing exhaust for a turbo car is 'no exhaust'

That being said, I'm wondering other peoples thoughts regarding how the ECU would deal with this decrease in backpressure. Obviously it will allow the engine to flow more easily and the turbo to spool quicker.

I'm wondering if any of that can or will affect how the ECU reacts. And if so, will it react adversely.

Your thoughts and productive comments are appreciated.

cherryspeed · 10-22-2007, 09:31 PM

PM 4drhtrd about this I am sure he has a few suggestions for you.

Seriously though I think if it is managed well, with tuning ,it can be very efficent. I have heard people having good results with this pc.

Gandalf · 10-22-2007, 09:55 PM

Strangely I think you would want it to do the opposite. Have it dump the exhuast under 10psi to let the turbo spool faster, then close. Once the turbo is spooled (assuming you have an aftermarket free flowing exhuast) I don't see a cut out being a huge boost. But the decrease in inital spool time might be awesome, even in between shifts.

SSinstaller · 10-22-2007, 11:27 PM

Unless you have a large slow spooling turbo I don't think it's necessary-our tiny turbo can already hit 20+ psi by 2500 rpm. Without some very effective boost control, you'd just end up with a very large boost spike.

masskaos · 10-23-2007, 08:57 AM

+1

that screams boost creep... you would need some management for that.

sbspeed · 10-23-2007, 01:00 PM

So boost creep is the main source of concern?

I was really wondering if the ECU is going to freak out and go lean or something - who knows... only time will tell.

ATE BALLER · 10-23-2007, 01:04 PM

Yeah, I think that's why 4drhtrd's motor blew. QTP's cutout is switched electrically, so that one might be better for this ECU.

Road Rage · 10-23-2007, 01:29 PM

i had the qtp on my car for afew months but with the stock boost controler the car was spikeing at 21-22 in first gear, this scared me so i removed it and put it on my drag car.

qtp is cheeper and better than atp's cut out. the qtp on my drag car is wired to a wot swich and my nos window switch to control when it opens and when it shuts, also adding a reostat you can control how much it opens to control boost spikes and creep

i love the qtp cut out but i cant stand qtp's customer service also if you buy one they are $50 cheeper at summit than qtp's web page.

sbspeed · 10-23-2007, 03:58 PM

Quote:

Yeah, I think that's why 4drhtrd's motor blew. QTP's cutout is switched electrically, so that one might be better for this ECU.[/b]

If I remember correctly, he had removed/disabled his MBC and was using his foot to control boost. While trying to race a motorcycle he got a little carried away and supernovaed his engine.

As far as QTP vs. VES - there have been numerous complaints about the QTP electric motor frying due to the heat involved. On a drag car I could see it working since it's not running for hours on end. The VES is completely mechanical so there aren't any issues w/heat.

acidbbg · 10-24-2007, 03:48 PM

I am seriously debating the QTP cutout.

I honestly don't like the drone these catbacks are making.

I ran one on my p5...it was lounder than a mack truck....

I currently have Street Unit TP and intersted in having it welded into it!

-C

10-22-2007, 09:26 PM	#1 (permalink)
sbspeed Rally Racer Join Date: Oct 2006 Posts: 1,208 Thanks: 2 Thanked 2 Times in 2 Posts Groans: 0 Groaned at 0 Times in 0 Posts iTrader: 0 reviews	For those of you that don't know what an ATP VES is - it's a boost actuated exhaust dump. The valve opens at 10psi and dumps the exhaust. Anything less than that, the exhaust will flow through the stock exhaust (or whatever exhaust is in place) We all know that the best performing exhaust for a turbo car is 'no exhaust' That being said, I'm wondering other peoples thoughts regarding how the ECU would deal with this decrease in backpressure. Obviously it will allow the engine to flow more easily and the turbo to spool quicker. I'm wondering if any of that can or will affect how the ECU reacts. And if so, will it react adversely. Your thoughts and productive comments are appreciated. __________________ almost done

10-22-2007, 09:55 PM	#3 (permalink)
Gandalf Rally Racer Join Date: Jan 2007 Posts: 1,576 Thanks: 0 Thanked 0 Times in 0 Posts Groans: 0 Groaned at 0 Times in 0 Posts iTrader: 0 reviews	Strangely I think you would want it to do the opposite. Have it dump the exhuast under 10psi to let the turbo spool faster, then close. Once the turbo is spooled (assuming you have an aftermarket free flowing exhuast) I don't see a cut out being a huge boost. But the decrease in inital spool time might be awesome, even in between shifts. __________________ "NASCAR is the Bose of auto racing. Makes a lot of money but ain't worth crap" 2006 Black Mica Mazdaspeed 6 Sport 2003 Vibrant Blue Sentra SE-R Spec-V - R.I.P 1/11/07 Auto-X fun

10-23-2007, 08:57 AM	#5 (permalink)
masskaos Track Racer Join Date: Apr 2006 Location: Back in Richmond VA Posts: 560 Thanks: 0 Thanked 0 Times in 0 Posts Groans: 0 Groaned at 0 Times in 0 Posts iTrader: 0 reviews	+1 that screams boost creep... you would need some management for that. __________________ 06 Speed6 GT- whitewater pearl w/ white and black leather and nav mods: ACT street clucth, ATP downpipe, AWR pass motor and tranny mount, CP-E cai, CP-E rear motor mount, CP-E catback, CP-E hpfp, CP-E FMIC, denso ITV-24 plugs, EBC redstuff brake pads, EGR delete, F2 BSD, HKS Twin Power Ignition, Koni Yellows, OCC, prosport boost gauge in vent pod, Rotara slotted rotors, PTP windage tray, RPM test springs, SPC ball joints, Synapse BOV, TT diff mount, TWM short shifter, whiteline rear sway

10-23-2007, 01:00 PM	#6 (permalink)
sbspeed Rally Racer Join Date: Oct 2006 Posts: 1,208 Thanks: 2 Thanked 2 Times in 2 Posts Groans: 0 Groaned at 0 Times in 0 Posts iTrader: 0 reviews	So boost creep is the main source of concern? I was really wondering if the ECU is going to freak out and go lean or something - who knows... only time will tell. __________________ almost done

10-23-2007, 01:04 PM	#7 (permalink)
ATE BALLER Mazda Guru Join Date: Mar 2006 Location: STL, MO Posts: 2,354 Thanks: 0 Thanked 4 Times in 3 Posts Groans: 0 Groaned at 0 Times in 0 Posts iTrader: 0 reviews	Yeah, I think that's why 4drhtrd's motor blew. QTP's cutout is switched electrically, so that one might be better for this ECU. __________________ V-Band Catless DP//Corksport CBE//Liquid-Air IC//GReddy Type-S BOV//GReddy Profec E-01 BC (first)//SU, AWR, & TT motor & diff mounts//TWM STS, bushings, & Desert Eagle knob//Walbro 255lph high pressure in-tank fuel pump (first/only)(I want more!)//F2 BSD//PTP Windage Tray//Redline hood struts//Stoptech Slotted Rotors w/ PosiQuiet Semi-Metalic Pads all around//WOT Box (first)//Kenwood 1800W RMS system (infinate baffel)

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10-22-2007, 09:31 PM	#2 (permalink)
cherryspeed Mazda Guru Join Date: Apr 2006 Location: Falls Church, VA Posts: 2,049 Thanks: 0 Thanked 0 Times in 0 Posts Groans: 0 Groaned at 0 Times in 0 Posts iTrader: 0 reviews	PM 4drhtrd about this I am sure he has a few suggestions for you. Seriously though I think if it is managed well, with tuning ,it can be very efficent. I have heard people having good results with this pc.

10-23-2007, 01:29 PM	#8 (permalink)
Road Rage Rally Racer Join Date: Oct 2006 Location: Mn Posts: 1,849 Thanks: 3 Thanked 4 Times in 4 Posts Groans: 0 Groaned at 0 Times in 0 Posts iTrader: 0 reviews	i had the qtp on my car for afew months but with the stock boost controler the car was spikeing at 21-22 in first gear, this scared me so i removed it and put it on my drag car. qtp is cheeper and better than atp's cut out. the qtp on my drag car is wired to a wot swich and my nos window switch to control when it opens and when it shuts, also adding a reostat you can control how much it opens to control boost spikes and creep i love the qtp cut out but i cant stand qtp's customer service also if you buy one they are $50 cheeper at summit than qtp's web page. __________________ "When you can leave black marks from the exit of every turn to the braking points of the next turn, then you have enough horsepower." "Oversteer is when you hit the wall with the back of the car. Understeer is when you hit the wall with the front of the car. Horsepower is how fast you hit the wall. Torque is how far the wall moves after you hit it." 06 Black Cherry Mica Speed6

10-24-2007, 03:48 PM	#10 (permalink)
acidbbg Track Racer Join Date: Apr 2007 Location: NJ Posts: 325 Thanks: 0 Thanked 0 Times in 0 Posts Groans: 0 Groaned at 0 Times in 0 Posts iTrader: 0 reviews	I am seriously debating the QTP cutout. I honestly don't like the drone these catbacks are making. I ran one on my p5...it was lounder than a mack truck.... I currently have Street Unit TP and intersted in having it welded into it! -C __________________ Current Mods: Wouldn't you like to know