m-tdi timing

[oldskool rich]

ive just added a disco 300tdi pump to my 1Z corrado, it seems to be ok except it doesnt like to cold start and it literaly doesnt rev from cold, i put my foot down and nothing happens untill after a few minits, when it does happen it does alot of caughing and spluttering.

I timed it to 1mm duno if thats right, but thats what you do on an AAZ, the smoke seems a little retarded though seems quite light coloured

anyone got any surgestions? it doesnt appear to be knocking so it cant be that far out, it doesnt have a manual choke so i cant control the timing with that, any ideas how i might advance it wen starting? or does it just need advancing in general?

[Sprockets]

Well, as timed in the 300TDi engine itself, it should be 1.54mm without EGR, and 1.4mm with, so I vote for advancing the pump up a bit more

-Gavin

[greg123]

Is the discovery pump a better mtdi pump than the 2.8 iveco/fiat/renault one that is banded about on here/tdi club but pretty hard to find?

Greg.

[oldskool rich]

thanx greg, that makes sence then

better is a strong word, disco is 11mm the 2.8 is 12mm
11mm is better for high revs, 12mm is better for low rpm

ive only experianced 11mm so far, ive heard of 12mm pps snapping at high revs and sum people swap back to 11mm so its hard to say whats better

im looking for a good mtdi pump for my 2.0 diesel, do you have any details about this 12mm pump i wouldnt mind trying it out if i can find one, i thort it was only on the AGK 2.8LT

[greg123]

As far as I know, VW never made a 2.8 litre tdi 4-cylinder.  The LT is actually a Mercedes Sprinter and should have the 2.9 5-cylinder tdi (an amazing engine) or later cdi, I guess VW wanted to source a different power train for some reason.

As far as I know, don't quote me, it's teh sofim engine.  This is Iveco's engine, as used in the Iveco Daily.  Iveco farm their Sofim engine out to the Renault Master, Fiat Ducato, Citron Relay, Peugeot Boxer and AFIK the LT 2.8.  It was popular a few years ago because few of those 'car' based mfr's had a suitable large cc engine and for the amount of vans they sell it made more sense to buy in.  Merc obviously had a range of big diesels so they were not bothered.

Even now, the new Sevel (Fiat Ducato etc) van with the 2.3 litre and 3.0 litre engines are all Sofim Iveco engines.

So, I'm thinking any of the sofim range with a mech pump and tdi (the 2nd gen 2.8, before they switched it to common rail - later went to 3.0 litre 16v with 3rd gen common rail) would do the job.

Comments? Greg.

thanx greg, that makes sence then

better is a strong word, disco is 11mm the 2.8 is 12mm
11mm is better for high revs, 12mm is better for low rpm

ive only experianced 11mm so far, ive heard of 12mm pps snapping at high revs and sum people swap back to 11mm so its hard to say whats better

im looking for a good mtdi pump for my 2.0 diesel, do you have any details about this 12mm pump i wouldnt mind trying it out if i can find one, i thort it was only on the AGK 2.8LT

[Tintin]

Here info about that pump:

http://www.vwdiesel.net/phpBB/viewtopic.php?t=9598

[monkey magic]

rich, did you have any luck advancing the timing?

I ask because I was about to buy an aaz pump, but the disco pumps are easy to find and if they work well i'd rather use one of them..

[oldskool rich]

no it wont work on a an IDI, the cam plate is all wrong for the injectors

however it works great now on the TDI

[monkey magic]

Hi rich,

It's a TDi i need the pump for, so that sounds great. I'll get a landy pump and have a play.

Sadly, I just bought a 2.8 Ducato mechanical pump, and only realised when it was too late it doesn't have an LDA    I will research adding an LDA, it seems possible...

Nice one rich, was it just the extra advance, or have you done anything else to the landy pump?

[greg123]

Checkout that that first, earliest, 2.8 (the non-turbo one) wasn't an IDI motor as well.  They switched to DI around then and if yours is off an IDI the profile/advance curve will be all wrong I believe.

Greg.

Hi rich,

It's a TDi i need the pump for, so that sounds great. I'll get a landy pump and have a play.

Sadly, I just bought a 2.8 Ducato mechanical pump, and only realised when it was too late it doesn't have an LDA    I will research adding an LDA, it seems possible...

Nice one rich, was it just the extra advance, or have you done anything else to the landy pump?

[monkey magic]

Greg, this pump is off a 2002, so i'm happy its a DI, just gutted it has no lda. Wonder how gutless an AHU TDi will be with no boost...

[greg123]

Very?  U should be able to fit though.  lda not di specific i think, lots about

Greg, this pump is off a 2002, so i'm happy its a DI, just gutted it has no lda. Wonder how gutless an AHU TDi will be with no boost...

[greg123]

Another q while I'm thinking, as the 2.8 and the disco 200tdi pumps are both di, other than the 12mm of the 2.8  is the camplate/advance curve any aything else relevant about the same?  Or is one preferable to the other?

After reading many theads it appeared the main reason not to use a idi td pump on a mtdi was the profile/advance curve.

Greg.

[monkey magic]

Not sure on the differences re landrover vs 2.8 etc. But the reason an IDI pump isn't ideal for an mTDi is the pressures generated. TDi injectors open at a much higher pressure than IDI injectors.

As a result, TDi injectors open later when driven by an IDI pump, as the opening pressure is reached later, hence extra advance being needed to compensate.

Not sure of the other differences re advance curve etc, but i'm sure there are a few..

[Tintin]

The main reason is the injection time needed between IDI and DI motor.