Just got the 4x4 (MY02) and will be tuning soon.

(1) What is the difference between the V V T (?) 1.8T VAG engine that gives 150bhp in the 1.8T / 4x4 and 180bhp in the vRS.

>>?

(2) If it is ECU map only that differs, can I expect the same output as a remap on a vRS ? ie Do I say ' remap it as you would a vRS'

>>?

(3) How did the earlier 150bhp engine differ from the current one and will this put out less power than the V V T one

>>?

Take off the plastic cover from the top of the engine and look on the lifting eye. There will be a 3 letter code on there. Then ring Jabbasport (or tuner of your choice ) or look at their web site and they will tell you their expected output from that engine.

There are various models out there. The older model (such as I have) is controlled by a throttle cable and newer ones are drive-by-wire. I believe 4x4 are all drive-by-wire. Turbo sizes are also different.

Hi.

1) the ecu, everything else identical.

2) yes, as per above

3) The earlier engines (non-vvt and original K03 turbo) seemed to throw about 195bhp after a remap.

There's plenty in the FAQ about the differences, you may want to have a read in there....

:cheers:

oh, and it will most likely be the ARX engine, check the label in the spare wheel well, it will have the code printed on there.

Sorry didn't know about the FAQ - LOL!!!

http://briskoda.net/FAQ+index-myfaq-yes-id_cat-2-categories-Skoda+Technical-parent_id-0.html

Thanks - I didn't know about the FAQ either. Roll on tuning time... v.v.soon

It was also extensively discussed here.

Brought this one back up to once more discuss the brilliant topic of engine codes, particularly the AUQ and ARX in our RSs and 4x4s respectively.

Have been having some chats with Dutch Seat folk lately and one of them - a usually very informed chap with his own VAGCOM - told me that the AUQ is also in the Leon 1.8T Topsport (and perhaps logicially so, as it's Seat 180hp counter offer to the RS).

More interestingly, however, he said that the now discontinued four-wheel drive Leon 20VT4 (Jan 2001-May 2002) had an engine called the ARY. This would imply a close relation to the 4x4's ARX. Indeed, it's another engine with a Haldex mated to it, and Y comes after X...

But the ARY offers 180hp, a 6-speed close-ratio box and, remarkably, only complies to EU3 emission levels (as opposed to EU4 for the AUQ), as it apparently does not have VVT. This doesn't fit in with the knowledge of the ARX I gained here.

So is there any logic in these codes? Or is my Seat source misinformed?

List of some engine codes

Checking the 2002 and 2003 Skoda Octavia brochures, the following engines comply with EU3 (not EU4) emission levels:

1.8T/150bhp 4X4

1.9SDI/68bhp

1.9TDI/90bhp

1.9TDI/110bhp

Interestingly, the 1.8T/150bhp engine fitted in non-4X4 models - manual and auto - complies with EU4 levels, as does the 1.8T/180bhp in the vRS.

If we can't help, at least we can confuse....

Originally posted by DGW in this post

Interestingly, the 1.8T/150bhp engine fitted in non-4X4 models - manual and auto - complies with EU4 levels, as does the 1.8T/180bhp in the vRS.

Ah, so the codes do make sense, as the non-4x4 1.8T 150hp is called AUM, making it a close relation to the RS engine.

This all does make me wonder though, what is true about the idea that we earlier held that the 4x4 engine was fully similar to the RS engine in all but its ECU programme.

If the Leon 20VT4 ARY doesn't have VVT, why should the ARX have it? And if it does have it - I'm sure some of you have checked using the FAQ - why isn't it EU4-compliant? After all, VVT is an emission-control facility. Also, if it does have it, why would VAG take it off again for the follow-up 180hp, 6-speed ARY engine that came one year later?

Perhaps Jabba - that mentions VVT for the 4x4 on its power quote pages - can clarify instead of add to the confusion...

A guess here - it HAS to be to do with the haldex system for whatever reason - either some ECU related differences due to control of the 4x4 system or (another guess) because it simply uses more fuel in the EU testing regime(s).

This will probably add more confusion, but the 4motion TDi 130 passat uses quite a lot more fuel than the FWD 130 - does that pass the emissions regs. The more fuel you burn the more particulates you produce - relatively speaking ?

the ARX *does* have vvt, I would assume the reason it does not meet the same emissions levels as the FWD 150 1.8T is the fact it *can* burn more fuel if required, the FWD engine has smaller injectors, and hence is not as similar to the 180bhp fwd engine as the ARX.

Confused yet? ;-)

So to sum up for post-2000 engines:

AUM (Octavia 1.8T FWD):

150 hp

FWD

VVT, EU4

DBW

smaller injectors

hybrid K03/04 turbo

AUQ (Octavia RS, Leon Topsport)

180 hp

FWD

VVT, EU4

DBW

bigger injectors

hybrid K03/04 turbo

ARX (Octavia 4x4)

150 hp

Haldex

VVT, EU3

DBW

bigger injectors

hybrid K03/04 turbo

ARY (Leon 4)

180 hp

Haldex

non-VVT, EU3

DBW?

bigger injectors

hybrid K03/04 turbo

The only sense I see in the engine codes is FWD (AUx) vs. Haldex (ARx), whereas the similarity between other engine internals doesn't match up with the codes.

So ARY (year of birth 2001) after ARX (year of birth 2000) must simply be a matter of chronology within the Haldex range of engines.

Oh well, suits me fine... :(

Originally posted by Dutch4x4 in this post

So to sum up for post-2000 engines:

AUM (Octavia 1.8T FWD):

150 hp

FWD

VVT, EU4

DBW

smaller injectors

hybrid K03/04 turbo

Just checked my engine code (AUM), and I can confirm the car is:-

150 hp

FWD

VVT (see here )

I'm guessing that it's also DBW - the kick-down switch is located behind the accelerator pedal instead of somewhere in the engine compartment.

What dows DBW stand for?

DBW is "drive-by-wire" :wave:

Also referred as FBW (fly-by-wire) by some since it is widely used in modern aircraft.

.

I have managed with significant help from a 'horse's mouth' to have a detailed look at the differences between the various 1.8T engines fitted to the UK-spec Octavia with manual gearbox. The engines in question are:

AUM 110kW/150bhp Octavia FWD 08/00 >

ARX 110kW/150bhp Octavia 4X4 08/00 >

AUQ 132kW/180bhp Octavia vRS 12/00? >

I have not included the AGU (110kW/150bhp) as fitted to the Octavia 1.8T FWD between 10/96 and 07/00 in the comparison because there are a significant number of differences, including cable throttle, injectors, and the turbocharger. However that engine is substantially the same mechanically as the 3 being compared.

Previous posts have indicated that the ARX and AUQ are identical apart from the ECU, and that the AUM has smaller injectors and is less tuneable than the ARX. Read on...

The 3 engines share the same block, cylinder head, internal parts, intake system and throttle valve control unit, turbocharger, charge air cooler, exhaust manifold, injectors, anti-knock (thrust) sensors, spark plugs, lubrication system and fuel system (excluding fuel tank etc). Apart from the fact that the ARX (4X4) has a different return oil line for the turbocharger, and the AUQ (vRS) one different boot (rubber seal/pipe) on the charge air cooler, the 3 engines are identical. The ECUs for all 3 engines do however differ, as do the exhausts. Interestingly, the same clutch is used on all 3 engines (and by the AGU).

I can't comment on gearboxes other than to say that the gearbox code for my 4X4 Estate is FEX and that for the vRS Hatch is EHA. Other gearbox codes for the 110kW/150bhp 1.8T Manual are: EBN - 08/00; ENJ - 08/00; ESV - 08/00; EVS - 10/96; and EGY - 10/96.

I would like to build up a list of which gearboxes are mated with which engines and in which models for future reference by Briskoda members. To that end if your gearbox is on the above list of other gearbox codes - and you will probably only know by checking the Vehicle Data sticker under the mat in the boot or on the inside cover of the Service Schedule - could you please post gearbox code, engine code and Octavia model below. The icing on the cake would be for you to provide the Model Description code which is also on the sticker, eg 1U53QX OCTAVIA COMBI ELE, since I can decode that. I know that I am being optimistic in expecting any replies, but if you don't ask you don't get. And when did you last have a look at you car's Service Schedule?

Very interesting, Denis! Count me in on your effort - will dive into my service booklet when I can.

So which one is the engine with the smaller injectors? The AGU? Or is the small-injector thing just a bogus story?

Oh, the hybrid K03/04 turbo is apparently called "K03sport".

So which one is the engine with the smaller injectors?

The AGU. I've amended my post to include that fact. I can't add anything useful about the turbochargers other than that the AGU version and that for the AUM/ARX/AUQ are made by KKK are both are available on exchange.

Right, not too sure which numbers you're after so I'll list them all, and if something shouldnt be in there (i don't want to post any info which might be used to clone my car ) then I would appreciate it if someone told me which parts I can remove and I'll edit the post...

Model Description:

1U25R4 OCTAVIA SEDAN RS

Gearbox/Paint Number/Interior:

EHA 9910 HV 132KW AUQ

Optional Equipment:

E0A 1D0 3BF 3AV 2ED 6FB 1AJ 3FA

1N6 1NL H8N 4UE 4R4 3NC 3QT 4X0

4A0 8L3 J1L 7AA 8GD 6Y0 9AK 9VE

7Q0 8YD 8QK 8X0 4K3 B09 G85

3L3 9P1 Q4H 7X0 9W0 8WD 7A2 3GA

QG1 0GG L13 7P4 F0A

HTH,

Q.

Just the job. Many thanks. Denis

Originally posted by DGW in this post

The AGU. I've amended my post to include that fact.

Right, so maybe I should update my earlier summary. Or post a new one to keep the thread flowing.

Anyway, here are my details:

Type description:

1U23QX OCTAVIA SEDAN ELE

Gearbox, paint code, interior code, power output, engine code:

FEX 9910 BE 110 KW ARX

Below is an edited version of my earlier post, with Denis' latest findings included.

Originally posted by Dutch4x4 in this post

So to sum up:

AGU (Octavia 1.8T FWD, 10/96-08/00):

150 hp

FWD

non-VVT, EU3

throttle cable

smaller injectors

K03 turbo

EVS or EGY gearbox

AUM (Octavia 1.8T FWD, post 08-00):

150 hp

FWD

VVT, EU4

DBW

bigger injectors

K03sport turbo

EBN, ENJ or ESV gearbox

AUQ (Octavia RS, Leon Topsport)

180 hp

FWD

VVT, EU4

DBW

bigger injectors

K03sport turbo

Octy: EHA gearbox

Leon: ? gearbox (6-speed 'box)

ARX (Octavia 4x4)

150 hp

Haldex

VVT, EU3

DBW

bigger injectors

K03sport turbo

FEX gearbox

ARY (Leon 4)

180 hp

Haldex

non-VVT, EU3

DBW

bigger injectors

K03sport turbo

? gearbox (6-speed 'box)

Perhaps we could add VW and Audi models too...