Audi TT MK1: Nitrous Backfire


Wow…

I was amazed at what I saw at the garage this weekend. An $80,000 MK1 TT that was sold by it owner for… $11,000. Reason in two words? Nitrous Backfire.

Yes, this 500HP+ 4 cylinder TT lost its life in just a few seconds, as a nitrous oxyde backfire took the engine out.

Nitrous 101

Nitrous oxide (often referred to as just “nitrous” or “NOS” as the latter refers to the NOS brand, derived from the initials of the company name Nitrous Oxide Systems) allows the engine to burn more fuel by providing more oxygen than air alone, resulting in a more powerful combustion. (By weight, Nitrous contains 36% oxygen while air has only 23%.) The gas itself is not flammable at a low pressure/temperature, but it delivers more oxygen than atmospheric air by breaking down at elevated temperatures. Therefore, it is often mixed with another fuel that is easier to deflagrate. Nitrous oxide is stored as a compressed liquid; the evaporation and expansion of liquid nitrous oxide in the intake manifold causes a large drop in intake charge temperature, resulting in a denser charge, further allowing more air/fuel mixture to enter the cylinder. Nitrous oxide is one of the simplest ways to provide a significant horsepower boost to any gasoline engine.

As with all modifications to increase power, the use of nitrous oxide carries with it concerns about the reliability and longevity of an engine. Due to the greatly increased cylinder pressures, the engine as a whole is placed under greater stress, especially the parts involved with the combustion chamber. An engine with components not able to cope with the increased stress imposed by the use of nitrous systems can experience major engine damage, such as cracked or destroyed pistons, connecting rods, or crankshafts.

Even if the engine is up to the task, severe damage can occur if a problem occurs in the fuel system; an engine running with nitrous oxide depends heavily on the proper air to fuel ratio to prevent detonation from occurring. For example, if the engine’s fuel supply were to be reduced, this would cause the engine to run lean by whatever degree the fuel delivery was reduced, which can lead to engine knock, detonation or backfire. Depending on the engine, this may only need to occur for a matter of seconds before major damage occurs.

It is essential not to reach a fuel cut rev limit as this will also momentarily restrict the fuel flow to the engine and as nitrous is still being injected into the engine without the additional fuel the engine will again run lean and cause detonation. Good optimisation of enrichment fuel is essential otherwise the fuel can ‘drop out’ and puddle in the intake tract, potentially causing a backfire.

Audi TT Nitrous Backfire

So what happened exactly to this TT? Not sure. My theory: a) The driver launched the nitrous at a too low RPM or; b) Ran the TT too lean.

At low RPM, think about what’s going on: you’re spraying nitrous into the intake at a constant flow. That is, the nitrous bottle and solenoids have no idea what RPM you’re at, and they’re just pushing it into the intake at a constant volume. Inside the engine, though, the nitrous and fuel combination is being sucked into the cylinders during every stroke. The net result is that at low RPM, you’re getting far more of the mixture into the cylinders. At 3000 RPM, for example, you’re getting twice the amount as at 6000 RPM. So, you can imagine that running nitrous at, say 1000 RPM, is far more stressful on the motor as at 3000 RPM, and probably caused the TT’s nitrous backfire (the nitrous/fuel combination exploded in the intake manifold rather than in the cylinders.

Likewise, running the car too lean was most likely causing preignition and ignited the mixture at the wrong time, such as above. Because nitrous is more oxygen-rich than air, the recommended air fuel ratio becomes 9.5 parts of nitrous to 1 part of fuel (9.5:1). That means when oxygen-rich nitrous is introduced additional fuel must also be supplied in order to maintain the optimum ratio. Without the additional fuel the mixture would become dangerously lean – circumstances that always lead to severe and expensive damage… and in this case $69,000 loss…

Pics

Vids

Watch a nitrous backfire on a Mustang

Posted in Audi TT MK1 Performance | Tagged | 7 Comments

Audi TT (8N MK1) Tuning – Dany Marquis


I got a few inquiries of fellow TT enthusiasts about the blue TT that was at Montreal’s importFest. (see my coverage here). Well, there you go guys! Enjoy!

Owner: Dany Marquis

There’s a lot of pride when we complete a tuning project. In fact, the tuning scene exists for this. The owners of nice cars are proud to showcase the mods they are capable of doing to their rides and so is Dany Marquis, the owner of this Audi TT. He has modified nearly everything on this cars body since it has left the factory. This TT was built to win beauty contests, and she does not have much difficulty doing it!
Marbled finish
Aside from the aviator gray finish, one of the most beautiful original colors ever used by Audi, it is difficult not to notice the blue marbled finish in the center of the body that extends to the front grill of this A8 . Hard to imagine the finish was red at first! We also note that the TT is lowered thanks to a Reiger body kit & bumper. While sitting on a VMax adjustable suspension, the car is perched on DAI 18 inch rims that are 8.5 inches wide. Recently, our owner swapped these wheels for a set of Fast Wheels. Finally, Dany just installed huge K-Sport front disc brakes.
Same theme for the interior
Since this is a show car, Dany has continued with the same theme for the interior. Among the items worthy of mention, there are G-Force seats, a Realco short throw gear box and a five-point JS R harness button to suggest a “race car” look. The blue marble is also present in the interior of Dany’s TT as well. We can quickly see that the audio / video equipment inside the car has nothing to do with your small radio bought in stores. Dany has the complete package: A Clarion DVD player, 2 7 inch monitors, XM satellite radio, two amplifiers and four MA Audio subwoofers all custom cased in the trunk by hand.
Turbo Compressed Mechanics
This German car has a list of mods under the hood so long it is best to consult the Team Refugee website, a group of car owners for these exhibition cars. But we can still tell you that the four-cylinder 1.8-liter engine is as energetic as possible and that the sound it emits is typical of Audi products. Despite all the equipment onboard, which makes the car considerably heavy, Dany still manages to do the quarter mile in 12.56 seconds at Napierville, all made possible with a turbo pressure adjusted to 35 pounds. Dany was present at the Salon de Saint-Hyacinthe and he will also be present at several other rallies this season where Dany will be pleased to introduce his German beauty, that’s for sure!

Pics

a video

Posted in Audi TT MK1, Paint | Leave a comment

ImportFest Montreal (October 1st 2011)


ImportFest Montreal 2011

Presented by Scion at the Place Bonaventure

Pictures & review of the tuning show

I’m just back from the show! People ask me “how was it?” And they all get the same answer: Well aside from the girls, there were only 2 TTs. 🙂 No joke, this year’s tuning show was similar to previous years in Toronto, aside from the fact that it’s smaller. Girls, DJs, heavy modded cars and lots of testosterone; it was all there.

I will try and give you guys a quick view of the show, through my eyes. So you will see
the 2 TTs, some interesting cars, some funny and obviously the girls.

Hope you enjoy,

Andre

The Show

First MK1 TT (BTW, no MK2s)

Second MK1 TT

Random tuned cars at the Montreal ImportFest 2011


Yes, it’s an Audi A8 severely tuned!

Too funny

Full body wrap – really amazing. Visit http://www.restyleit.ca to see more of this company’s client cars

Now… some of the girls… 🙂

Still here?? Well… you should visit my Audi TT Babes Pages… here.

Posted in Audi TT Babes, Audi TT MK1 | Tagged , , | 3 Comments

Friend’s Audi TT VR6 Turbo = Kaputt!


Audi TT VR6 Turbo

A friend’s VR6 Turbo is blown-up!

I just came across a friend’s TT… Poor guy now has a blown VR6 Turbo engine! Result of a wastegate hose that went from severely cracked to broken… In a split second, the boost went from about 12 pounds to over 20! … ” And then … white smoke in the back of the car and no torque …” The pics below leave leave no room for imagination.

So guys, if you are running similar projects, make time to check that tiny hose… You never know.

Cheers,

Andre

vr6 Turbo

tt vr6 Turbo

Audi tt vr6 TurboAudi tt MK1 vr6 TurboAudi tt MK1 8n vr6 Turbo

Posted in Audi TT MK1 Performance | Tagged | Leave a comment

Client Cars


Hi Guys,

I thought it would be fun to publish pictures of projects that have some of my tuning parts. Here is Jay’s TT finished… for this year! 🙂

Way to go Jay!

Posted in Community | Tagged | 5 Comments

Brake Pad Installation (Audi TT MK1 – 2FN) How to change brake pads (DIY)


How to change Audi TT brake pads

Hi Guys,

I rencently changed the brake pads on my TT and did not find an easy “how to change Audi TT brake pads”. So I decided to create one. Here’s my DIY guide!

So read-on! Enjoy,

Andre

1 – Take the wheels off the car. Did I really need to write this?

2 –

3 –

4 –

5 –

auti-tt-mk1-8n-brake-pad-installation-diy

6 –

7  –

Posted in Audi TT MK1 Performance | Tagged | 16 Comments

New acquisition! BMW M3 E92


Hi guys!

Quick update! Bought myself a slow car… An M3 (E92) Double-Clutch Transmission (M-DCT) with carbon fiber rooftop. Although the V8 engine develops 420 HP, it still feels slower compared to the TT’s V6 Turbo!

Nice driveway, isn’t it? 🙂

Audi TT RS MK1 & BMW M3 E92

My toys

Posted in Uncategorized | Tagged | Leave a comment

Track pictures (Mont Tremblant)


Hi Guys,

Here’s a few more pics! I also took the liberty of taking shots of the TT next to a… GT3 RS!

Enjoy,

Andre

Track pics

Audi TT RS MK1 on the race track - 2

Audi TT RS MK1 on the race track - 1

Audi TT RS MK1 on the race track - 6

Andre-Martin Hobbs

Look at that guy! 🙂

Audi TT RS MK1 on the race track - 4

Audi TT RS MK1 on the race track - 3

Andre-Martin Hobbs
Marc Genest & André Martin Hobbs

My brother in law and I (in red) 🙂

TT RS vs GT3 RS

TTRS (MK1) vs GT3 RS - 5

TTRS (MK1) vs GT3 RS - 4

TTRS (MK1) vs GT3 RS - 3

TTRS (MK1) vs GT3 RS - 2

TTRS (MK1) vs GT3 RS - 1

Posted in My Auti TT Race Track Pictures | Tagged , | 3 Comments

Audi TT RS vs Porsche GT3 vs Nissan GTR


Yeah, your read right! Audi TT RS vs Porsche GT3 vs Nissan GTR   🙂

How will it end?

Audi TT RS vs Porsche GT3 vs Nissan GTR

Inside or outside… Who will be in front?

Audi TT RS vs Porsche GT3

See for yourself! At: http://www.youtube.com/user/andremartinhobbs

Cheers,

Andre

Posted in Black/Orange Look, My Auti TT Race Track Pictures | Tagged , , , | 1 Comment

A Time For Laughter: Tool Time


These hilarious automotive tool definitions have been floating around on the Internet for some time now with no credit to the author. This piece originally appeared in Road & Track, April 1996 in Peter Egan’s column, Side Glances. The original column has a half-page introduction and some additional definitions, so I recommend you try to obtain that issue of R&T. It was also reprinted in the book, Side Glances, Vol. 2, 1992-1997 by Peter Egan, published by Brooklands Books Ltd., a wonderfuil collection of 66 or Peter’s columns. 

Enjoy!

Hammer: Originally employed as a weapon of war, the hammer nowadays is used as a kind of divining rod to locate expensive car parts not far from the object we are trying to hit.

Mechanic’s Knife: Used to open and slice through the contents of cardboard cartons delivered to your front door; works particularly well on boxes containing convertible tops or tonneau covers.

Electric Hand Drill: Normally used for spinning steel Pop rivets in their holes until you die of old age, but it also works great for drilling rollbar mounting holes in the floor of a sports car just above the brake line that goes to the rear axle.

Hacksaw: One of a family of cutting tools built on the Ouija board principle. It transforms human energy into a crooked, unpredictable motion, and the more you attempt to influence its course, the more dismal your future becomes.

Vise-Grips: Used to round off bolt heads. If nothing else is available, they can also be used to transfer intense welding heat to the palm of your hand.

Oxyacetelene Torch: Used almost entirely for lighting those stale garage cigarettes you keep hidden in the back of the Whitworth socket drawer (What wife would think to look in there?) because you can never remember to buy lighter fluid for the Zippo lighter you got from the PX at Fort Campbell

Zippo Lighter: See oxyacetelene torch.

Whitworth Sockets: Once used for working on older British cars and motorcycles, they are now used mainly for hiding six-month old Salems from the sort of person who would throw them away for no good reason.

Drill Press: A tall upright machine useful for suddenly snatching flat metal bar stock out of your hands so that it smacks you in the chest and flings your beer across the room, splattering it against the Rolling Stones poster over the bench grinder.

Wire Wheel: Cleans rust off old bolts and then throws them somewhere under the workbench with the speed of light. Also removes fingerprint whorls and hard-earned guitar callouses in about the time it takes you to say, “Django Reinhardt”.

Hydraulic Floor Jack: Used for lowering a Mustang to the ground after you have installed a set of Ford Motorsports lowered road springs, trappng the jack handle firmly under the front air dam.

Eight-Foot Long Douglas Fir 2X4: Used for levering a car upward off a hydraulic jack.

Tweezers: A tool for removing wood splinters.

Phone: Tool for calling your neighbor Chris to see if he has another hydraulic floor jack.

Snap-On Gasket Scraper: Theoretically useful as a sandwich tool for spreading mayonnaise; used mainly for getting dog-doo off your boot.

E-Z Out Bolt and Stud Extractor: A tool that snaps off in bolt holes and is ten times harder than any known drill bit.

Timing Light: A stroboscopic instrument for illuminating grease buildup on crankshaft pulleys.

Two-Ton Hydraulic Engine Hoist: A handy tool for testing the tensile strength of ground straps and hydraulic clutch lines you may have forgotten to disconnect.

Craftsman 1/2 x 16-inch Screwdriver: A large motor mount prying tool that inexplicably has an accurately machined screwdriver tip on the end without the handle.

Battery Electrolyte Tester: A handy tool for transferring sulfuric acid from car battery to the inside of your toolbox after determining that your battery is dead as a doornail, just as you thought.

Aviation Metal Snips: See Hacksaw.

Trouble Light: The mechanic’s own tanning booth. Sometimes called a drop light, it is a good source of vitamin D, “the sunshine vitamin”, which is not otherwise found under cars at night. Health benefits aside, its main purpose is to consume 40-watt light bulbs at about the same rate that 105-mm howitzer shells might be used during, say, the first few hours of the Battle of the Bulge. More often dark than light, its name is somewhat misleading.

Phillips Screwdriver: Normally used to stab the lids of old-style paper-and-tin oil cans and splash oil on your shirt; can also be used, as the name implies, to round off Phillips screw heads.

Air Compressor: A machine that takes energy produced in a coal-burning power plant 200 miles away and transforms it into compressed air that travels by hose to a Chicago Pneumatic impact wrench that grips rusty suspension bolts last tightened 40 years ago by someone in Abingdon, Oxfordshire, and rounds them off.

Grease Gun: A messy tool for checking to see if your zerk fittings are still plugged with rust.

Posted in A Time For Laughter | Tagged | Leave a comment