VTDA Temp analysis including feed and Gasket effects...(Lotsa charts!)..>

TTschwing · 11-10-2006, 01:40 PM

From yesterday, I finally have all the data for your review.. The method for these various runs were as follows:

1) One Datalogger placed in the VTDA mouth, and the second in the engine compartment zip tied to the strut bar just above the N75.

2) Started with a cold engine, left the neighborhood (minutes 0-5) and did a 30 minute route. Initial country highway, than high speed back roads (15-25), a little traffic (minutes 25-30) and home. Let the car idle for 5 minutes at the end.(30-36)

3) Run 1

Cool) Engine compartment: Low profile gasket in place for some venting. VTDA: Feeds in place and operational.

4) Run 2: (Hot) Stock Firewall to hood gasket, Feeds blocked

5) Run 3: (Trim) Low profile gasket, Feeds blocked

Run 1: Good temp differentials between VTDA and Vented engine compartment

Run 2: Unvented engine, feeds blocked. Notice the higher engine compartment temps. VTDA still seems to be effective at blocking reflective heat.

Comparison of the engine compartment temps, Vented and unvented. Combination of the feeds and Low trim lowers temps about 18 degrees when all is stabilized.

Run 3: Low trim, blocked feeds. Ambient at the start was a little higher (afternoon, and the car only had a 3 hour cool down), but it seems that all stabilized once rolling so comparisons should still be valid.

Some conclusions on Venting..From the next chart, the Trim seems to lower temps in the compartment pretty substantially (use stabilized readings from the 15 minute mark on). The Gasket change seems to make the biggest single difference on these temps. The Engine compartment is being ventilated at the base of the windshield. Using a low profile trim piece allows cooling air in at this low pressure area.

Adding feeds does more to reduce the actual temps at the VTDA mouth but has little effect on overal engine compartment temps as most of that air is probably being ingested by the intake.

Conclusions:
1) The VTDA does a pretty good job of scrubbing off heat

2) The low profile trim piece has a substantial effect on lowering engine compartment temps and probably improving the longevity of hoses and wiring

3) Feeds reduce actual inlet temps nicely but have a minimal impact on compartment heat.

Discuss!

Low profile vs OEM trim difference:

A few more pics/charts here..

Seneb · 11-10-2006, 01:54 PM

Perhaps I need to order some. ;-)

GeTT da NeTT · 11-10-2006, 02:18 PM

My experience with my VTDA has been a noticable improvement low-mid RPM range (2200 to 3800 rpm) torque/usable power.

It looks like the vents are effective at transmitting ambient air to the venturi or opening of the VTDA. It seems to me that the real benefit would be during the duty cycle of the turbo, which is where most people would want it.

Nice work.

TTschwing · 11-10-2006, 02:22 PM

Allows venting into the engine compartment at the low pressure area at the base of the Windshield. The OEM piece seals the hood and firewall completely, the low profile allows the air in...:-) ($15 shipped priority mail)

GeTT da NeTT · 11-10-2006, 02:36 PM

kodeTT · 11-10-2006, 02:38 PM

kodeTT · 11-10-2006, 02:41 PM

MaD MaTTer · 11-10-2006, 03:27 PM

GOFASTT · 11-10-2006, 03:45 PM

increased dirt? disrupted airflow over the car?

TTschwing · 11-10-2006, 03:47 PM

So you can hear the VTDA, DV, and Turbo better.....:-)

11-10-2006, 01:40 PM	#1
TTschwing AudiWorld Uber User Account #: 13940 Join Date: Dec 2000 Posts: 53,321	VTDA Temp analysis including feed and Gasket effects...(Lotsa charts!)..> From yesterday, I finally have all the data for your review.. The method for these various runs were as follows: 1) One Datalogger placed in the VTDA mouth, and the second in the engine compartment zip tied to the strut bar just above the N75. 2) Started with a cold engine, left the neighborhood (minutes 0-5) and did a 30 minute route. Initial country highway, than high speed back roads (15-25), a little traffic (minutes 25-30) and home. Let the car idle for 5 minutes at the end.(30-36) 3) Run 1Cool) Engine compartment: Low profile gasket in place for some venting. VTDA: Feeds in place and operational. 4) Run 2: (Hot) Stock Firewall to hood gasket, Feeds blocked 5) Run 3: (Trim) Low profile gasket, Feeds blocked Run 1: Good temp differentials between VTDA and Vented engine compartment Run 2: Unvented engine, feeds blocked. Notice the higher engine compartment temps. VTDA still seems to be effective at blocking reflective heat. Comparison of the engine compartment temps, Vented and unvented. Combination of the feeds and Low trim lowers temps about 18 degrees when all is stabilized. Run 3: Low trim, blocked feeds. Ambient at the start was a little higher (afternoon, and the car only had a 3 hour cool down), but it seems that all stabilized once rolling so comparisons should still be valid. Some conclusions on Venting..From the next chart, the Trim seems to lower temps in the compartment pretty substantially (use stabilized readings from the 15 minute mark on). The Gasket change seems to make the biggest single difference on these temps. The Engine compartment is being ventilated at the base of the windshield. Using a low profile trim piece allows cooling air in at this low pressure area. Adding feeds does more to reduce the actual temps at the VTDA mouth but has little effect on overal engine compartment temps as most of that air is probably being ingested by the intake. Conclusions: 1) The VTDA does a pretty good job of scrubbing off heat 2) The low profile trim piece has a substantial effect on lowering engine compartment temps and probably improving the longevity of hoses and wiring 3) Feeds reduce actual inlet temps nicely but have a minimal impact on compartment heat. Discuss! Low profile vs OEM trim difference: A few more pics/charts here.. __________________ no sig, Not here

11-10-2006, 01:54 PM	#2
Seneb Member Account #: 73514 Join Date: Apr 2004 Posts: 4,150	Awesome Steve. It looks like the feeds would be beneficial for the VTDA. Perhaps I need to order some. ;-) __________________ 2001 225QC LZ9V TT Offset Calculator FAQ thread

11-10-2006, 02:18 PM	#3
GeTT da NeTT AudiWorld Senior Member Account #: 88567 Join Date: Feb 2005 Posts: 4,094	Steve, you have me at a disadvantage gaskets. Could you clarify? My experience with my VTDA has been a noticable improvement low-mid RPM range (2200 to 3800 rpm) torque/usable power. It looks like the vents are effective at transmitting ambient air to the venturi or opening of the VTDA. It seems to me that the real benefit would be during the duty cycle of the turbo, which is where most people would want it. Nice work. __________________ It's not slow because it's SILVER

11-10-2006, 02:22 PM	#4
TTschwing AudiWorld Uber User Account #: 13940 Join Date: Dec 2000 Posts: 53,321	The Low profile trim..>> Allows venting into the engine compartment at the low pressure area at the base of the Windshield. The OEM piece seals the hood and firewall completely, the low profile allows the air in...:-) ($15 shipped priority mail) __________________ no sig, Not here

11-10-2006, 02:36 PM	#5
GeTT da NeTT AudiWorld Senior Member Account #: 88567 Join Date: Feb 2005 Posts: 4,094	Comprendi. Seems reasonable, __________________ It's not slow because it's SILVER

11-10-2006, 02:38 PM	#6
kodeTT Elder Member Account #: 23258 Join Date: Jul 2001 Posts: 11,395	nice analysis Steve. glad i got my low profile trim before the onslaught! __________________ Bill '01 Atlas Gray Tip allroad : winter package : Dahlback chip : H-Sport sway bars '01 225 TTQC : Brilliant Black TT : Ebony : Premium : Heated Seats : Bose —\| Engine \|— :: Dahlback chip :: Dahlback intake manifold :: 42 Draft Designs 3" downpipe with test pipe :: EVOshield intake gasket :: Bosch Super Copper spark plugs :: N75 K valve :: Modshack VTDA :: Modshack MoFo v.2 with Tyrol adjustable FPR :: Forge SPLTR DV :: relocated :: O.CT FMIC :: Samco hoses [intake, upper and lower] :: VF Engineering side motor and pendulum mounts :: Custom 3" Sheep/Mufflex exhaust :: Optima YellowTop battery —\| Suspension/Drivetrain \|— :: KW variant 3 coilovers : 8012 spring mod :: DieselGeek Sigma 6 short shifter upgrade :: DEFCON3 with H2S rear spherical bearings :: CPT control arms (lower) \| Forge tiebars (upper) :: Haldex race controller :: H-Sport front and rear adjustable sway bars —\| Exterior \|— :: Blindspot "Euro" mirrors :: Bosch Aerotwin wipers :: OEM roof rack [Thule bike rack] :: Audi OEM 3.2 bumper :: Audi OEM Quattro Sport Phantom Black grilles :: RISO smoke clear corners : o-gas : zero v.3 :: RISO CF arc :: Smoked Euro tail lights <Jon's Tinted Tails> :: Black sidemarkers <Jon's Tinted Tails> :: Wilwood 4-piston, 13" rotor BBK :: Summer Sandals [Toyo T-1Rs on 19" BBS LMs ET25] :: Winter Boots [Nokian WR on 19" LMs] :: ECS 12.1" rear cross drilled slotted rotors :: Hawk HPS brake pads :: StopTech SS brake lines —\| Interior \|— :: ModShack gadgeTT v.2 :: AWE Tuning boost gauge :: Hardwired Garmin nuvi 360 with gadgeTT2 :: Hardwired V1 :: PIAA H3 Super Plasma foglight and switch mod :: ice>Link v.1.1 : iPod interface :: Audi RS4 perforated steering wheel :: Audi OEM TT winter mats :: Audi OEM S-Line all aluminum shift knob :: RISO O-gas :: Britax Starriser seat in rear —\| yard sale \|— :: KMD lightweight crank pulley —\| Future Mods \|— :: Euro dash

11-10-2006, 02:41 PM	#7
kodeTT Elder Member Account #: 23258 Join Date: Jul 2001 Posts: 11,395	my OEM doesn't even stay down as well as it should anyway...glad i ordered before the rush! __________________ Bill '01 Atlas Gray Tip allroad : winter package : Dahlback chip : H-Sport sway bars '01 225 TTQC : Brilliant Black TT : Ebony : Premium : Heated Seats : Bose —\| Engine \|— :: Dahlback chip :: Dahlback intake manifold :: 42 Draft Designs 3" downpipe with test pipe :: EVOshield intake gasket :: Bosch Super Copper spark plugs :: N75 K valve :: Modshack VTDA :: Modshack MoFo v.2 with Tyrol adjustable FPR :: Forge SPLTR DV :: relocated :: O.CT FMIC :: Samco hoses [intake, upper and lower] :: VF Engineering side motor and pendulum mounts :: Custom 3" Sheep/Mufflex exhaust :: Optima YellowTop battery —\| Suspension/Drivetrain \|— :: KW variant 3 coilovers : 8012 spring mod :: DieselGeek Sigma 6 short shifter upgrade :: DEFCON3 with H2S rear spherical bearings :: CPT control arms (lower) \| Forge tiebars (upper) :: Haldex race controller :: H-Sport front and rear adjustable sway bars —\| Exterior \|— :: Blindspot "Euro" mirrors :: Bosch Aerotwin wipers :: OEM roof rack [Thule bike rack] :: Audi OEM 3.2 bumper :: Audi OEM Quattro Sport Phantom Black grilles :: RISO smoke clear corners : o-gas : zero v.3 :: RISO CF arc :: Smoked Euro tail lights <Jon's Tinted Tails> :: Black sidemarkers <Jon's Tinted Tails> :: Wilwood 4-piston, 13" rotor BBK :: Summer Sandals [Toyo T-1Rs on 19" BBS LMs ET25] :: Winter Boots [Nokian WR on 19" LMs] :: ECS 12.1" rear cross drilled slotted rotors :: Hawk HPS brake pads :: StopTech SS brake lines —\| Interior \|— :: ModShack gadgeTT v.2 :: AWE Tuning boost gauge :: Hardwired Garmin nuvi 360 with gadgeTT2 :: Hardwired V1 :: PIAA H3 Super Plasma foglight and switch mod :: ice>Link v.1.1 : iPod interface :: Audi RS4 perforated steering wheel :: Audi OEM TT winter mats :: Audi OEM S-Line all aluminum shift knob :: RISO O-gas :: Britax Starriser seat in rear —\| yard sale \|— :: KMD lightweight crank pulley —\| Future Mods \|— :: Euro dash

11-10-2006, 03:27 PM	#8
MaD MaTTer Member Account #: 98017 Join Date: Oct 2005 Posts: 637	Great. thank you Steve, your work, time and efforts are greatly appreciated. YGM __________________

11-10-2006, 03:45 PM	#9
GOFASTT Audiworld Junior Member Account #: 101596 Join Date: Dec 2005 Posts: 530	The Low profile trim..is there a downside to this... increased dirt? disrupted airflow over the car?

11-10-2006, 03:47 PM	#10
TTschwing AudiWorld Uber User Account #: 13940 Join Date: Dec 2000 Posts: 53,321	No.......Just a little more noise in the cabin..>>> So you can hear the VTDA, DV, and Turbo better.....:-) __________________ no sig, Not here

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