A4 TDi

[johnsbegood]

hi, does anyone now the difference between a 90BHP TDi engine and a 110BHP engine, i.e the injectors are bigger and the ecu is different.

if you could email me at johnsbegood@hotmail.com that would be brilliant.

Cheers

Paul

England

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[Fabuloussaiso]

isn't it just more boost - may bigger injectors, but +20hp more... generally you won't need bigger inj. for this power increase.

[LateNightCable]

I may have read something about higher pressure injectors once.

[Fabuloussaiso]

However, a friend of me drives a VW Golf GTI TDI it has the 110hp engine as well and he told me it's nutin else than a "chipped" 90hp engine. So I'd say it's everything the same hardware, just a software change.

[GIR]

hi, does anyone now the difference between a 90BHP TDi engine and a 110BHP engine, i.e the injectors are bigger and the ecu is different.

if you could email me at johnsbegood@hotmail.com that would be brilliant.

Cheers

Paul

England

The differences are:

* The turbocharger is a variable-vane type instead of conventional wastegate

* The injection system uses a distributor-type pump

* Differences in the ECU

* Differences in the plumbing and controls for the turbo

Also note that there are several engine types out there.

The 1.9 TDI 90BHP (Type A3)

The 1.9 TDI 110BHP (Type A3)

The 1.9 TDI 90BHP (Type A4)

The 1.9 TDI 110BHP (Type A4)

The 1.9 TDI 115BHP (Type PD)

The 1.9 TDI 150BHP (Type PD)

Also there's a 2 liter 170BHP GTI TDI engine on the way type PD.

There's almost no way to tell these engines apart except for the badge on the car or if you're a mechanic you can look at the turbo type, the fuel pump and the oil filter.

1.9 litre 4-cylinder 90hp (A3 type) - used in various models sold until approximately 1998 in Europe and North America. Within this document we will call this the A3 engine even though it was also used in other models, because the most popular cars sold with this engine were the A3-chassis Golf, Jetta, and Vento sold from 1994 until early 1999. Not all model years were available in all markets, and this engine was replaced by the newer type (here called the A4 type) gradually over a period of years. Other models sold with this engine include the B4 Passat (1995 - 1997), VW Sharan minivan, and various Audi models.

The injection system uses a distributor-type pump. On cars with transverse engines, the A3 engine can be distinguished from the later type by the spin-on oil filter on the front of the engine facing down at an angle, the air filter housing is at the right front corner of the car, and the two black plastic pipes to the intercooler lead towards the left front corner of the car. There are other differences, but these are the most easily visible.

The turbocharger is a conventional wastegate type.

1.9 litre 4-cylinder 110hp (A3 type) - used on the same models as the 90hp but not available in all markets - in particular, not available in North America. Visually it is almost impossible to tell apart from the A3 90hp engine, except for the red "I" in the TDI badges used on the car in various places. The engine itself is identical to the 90hp model.

The turbocharger is a variable-vane type, and the injection system uses a distributor-type pump which looks the same as that of the 90hp model. Obviously there are differences in the ECU, and in the plumbing and controls for the turbo, since the turbo is not the same as for the 90hp model.

1.9 litre 4-cylinder 90hp (A4 type) - used in various models available in Europe and North America from 1998 on, this gradually replaced the previous engine as the car models were changed. Within this document we will call this the A4 engine because the most common application is the A4-chassis Golf, Jetta, Bora, New Beetle, and various models from Seat and Skoda using the same chassis.

The injection system uses a distributor-type pump. The oil filter is a cartridge type, and sits in a vertical container on the front of the engine towards the left of the car. On cars with transverse engines, the air filter housing is at the left side of the engine compartment and the two black plastic pipes to the intercooler lead towards the right front corner - exactly the opposite of the arrangement used on the previous model.

On North American models, the turbocharger is a variable-vane type. On European models, the turbocharger is a conventional wastegate type. The North American A4 engine is essentially a Euro 110hp A4 engine but with engine controls optimized for emissions rather than performance.

1.9 litre 4-cylinder 110hp (A4 type) - virtually identical in appearance and specification to the 90hp except for the engine controls; cars using this engine have a red "I" in the TDI badges. Not available in North America.

1.9 litre 4-cylinder 115hp "PD" - again similar to the A4-type engine but with the "pump-nozzle" injection system. Although the peak power is only slightly more than the 110, maximum torque is much higher and the engine has lower exhaust emissions. VW intends to gradually replace the 110hp models with this engine. Not available in North America, reportedly because the exhaust emission controls used on this engine cannot be used with fuels containing greater than 50 parts per million of sulfur, whereas at this writing (1999) fuels in North America can have as much as 500 parts per million.

Models with this engine have badges with a silver "T" and red "DI".

The injection system is the "pump-nozzle" type, and the turbocharger is a variable-vane type. The lack of the injection pump mounted on the front of the engine is the obvious visual difference.

1.9 litre 4-cylinder 150hp "PD" - Few details are available at this writing. Models with this engine apparently will have badges with "TDI" in all red.

For more information you can check out the TDI club FAQ found here:

http://tdiclub.com/TDIFAQ/TDiFAQ-2.html

[GIR]

However, a friend of me drives a VW Golf GTI TDI it has the 110hp engine as well and he told me it's nutin else than a "chipped" 90hp engine. So I'd say it's everything the same hardware, just a software change.

There is a hardware difference between the engines. The engines are tuned conservatively to reduce consumption and emission, that's why it's possible to squeeze more BHP out of them with a chip.

Also there is no 90BHP GTI TDI. It's either 110BHP type A4 or 150BHP type PD. The Golf V will have a 2l 170bhp type PD engine.

And opposed to popular folklore you can not take the chip out a 110bhp engine and put it in a 90bhp engine to make it 110bhp. The turbo on these engines are completely different and thus the mapping and controls are different.