Swapping sausages - TDI conversion thread

[regcheeseman]

That's it. Been in the motor trade for 35 years, never seen inside an injection pimp till I saw Regs how to thread. Always thought pumps were just for specialist firm/dark arts.

I've been making a nice little earner based on this for a good few years now.

People who come for pump work often show an interest and I'm only too happy to show them the works, not really a black art, diesel pumps are a very clever bit of good old mechanical engineering. Nothing too scary in them though - once you done one and learnt the tricks they are simple.

Never been in the motor trade though - I wanted too but my old man said no - dont make the mistake I did, go to uni and get a nice easy job. He was right. Now the spannering is just a hobby that I use to de-stress from the 9-5.

[Jonnybigballs85]

I've been making a nice little earner based on this for a good few years now.

People who come for pump work often show an interest and I'm only too happy to show them the works, not really a black art, diesel pumps are a very clever bit of good old mechanical engineering. Nothing too scary in them though - once you done one and learnt the tricks they are simple.

Never been in the motor trade though - I wanted too but my old man said no - dont make the mistake I did, go to uni and get a nice easy job. He was right. Now the spannering is just a hobby that I use to de-stress from the 9-5.

Not to hijack the thread reg but what is it you do for a living?


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[S49]

I've been making a nice little earner based on this for a good few years now.

People who come for pump work often show an interest and I'm only too happy to show them the works, not really a black art, diesel pumps are a very clever bit of good old mechanical engineering. Nothing too scary in them though - once you done one and learnt the tricks they are simple.

Never been in the motor trade though - I wanted too but my old man said no - dont make the mistake I did, go to uni and get a nice easy job. He was right. Now the spannering is just a hobby that I use to de-stress from the 9-5.

It was a bit the other way round for me.My dad is a very clever engineer/fabricator but he always wanted to be in motor trade so encouraged me...doh. mind when I left school hardly anyone went to uni. Will be more inclined to have a go now, at pumps not education

[Grubb05]

So have i got this right? There is good money in the pimp business?

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[Activ8]

So have i got this right? There is good money in the pimp business?

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The pimp and pumping business are generally lucrative...

everything we*hear is an opinion,*not a fact.*
everything we see is a perspective,*not the truth

[regcheeseman]

Not to hijack the thread reg but what is it you do for a living?


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Electronics / magnetics/ production engineer at the moment

[Dave Sausages]

You fucking beauty! I changed the MAF sensor yesterday, took it out for a drash down the link road. What a difference! No more overboosting sits bang on 15psi, and pulls up hill! There is still a small boost drop at 60mph/3k rpm, but it'll only drops down to about 8psi, so loads better than it was, and I now feels it's safe to drive again knowing boost pressure is safe. I think I still have a bit to play with but way happier than before

[spedwing]

You fucking beauty! I changed the MAF sensor yesterday, took it out for a drash down the link road. What a difference! No more overboosting sits bang on 15psi, and pulls up hill! There is still a small boost drop at 60mph/3k rpm, but it'll only drops down to about 8psi, so loads better than it was, and I now feels it's safe to drive again knowing boost pressure is safe. I think I still have a bit to play with but way happier than before

Thank fuck for that !! [emoji13][emoji869]


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[regcheeseman]

You fucking beauty! I changed the MAF sensor yesterday, took it out for a drash down the link road. What a difference! No more overboosting sits bang on 15psi, and pulls up hill! There is still a small boost drop at 60mph/3k rpm, but it'll only drops down to about 8psi, so loads better than it was, and I now feels it's safe to drive again knowing boost pressure is safe. I think I still have a bit to play with but way happier than before

Why? that makes no sense at all?

Activ8! Why should the N75 care what the MAF is seeing?

[Dave Sausages]

I know not why, but I know it isn't overboosting as a direct result of changing the MAF sensor

[Activ8]

Why? that makes no sense at all?

Activ8! Why should the N75 care what the MAF is seeing?

Hmm this is very odd. Could be a lot of scenarios - without rereading thread - but one failure creating the next or another in time... but why no limp mode immediately. Sensor reading faults, wrong sensor or sensor values? Maybe the van has never ran 100%? So driver unaware of "real" drive experience?

I'm babbling on a caffeine hit - apologies.

You cannot have 'too much' airflow only too little which then restricts fuel and there for driver feel. Rpm & Fuel triggers boost.

The N75 map only uses fuel / rpm to set the N75 voltage%. It just corresponds to its own map.

Somethings not quite right with the MAF fix though.

Why no faults/limp mode? Could be the map if the mapper, in removing the immo has removed other switches or just takes out the display of fault code functions.

Possibly the ECU was seeing a different and lower boost value to Sausages boost gauge and let it continue to meet the required ECU demand. But why no fault triggered?

Could be a pressure leak before the MAP sensor / pressure drawoff for the ECU sensor. As a result of the turbo actuator seizing / N75 failing the MAF could be fubarred (test it) as a result of both these failing.

Could be an air feed leak between MAF and the compressor inlet, but not enough to trigger a fault/limp. ECU sees air flow as good but pressure at MAP low then air for fuelling remains good.

I would now check the MAP figures actual & specified against your boost gauge. Try teeing off at same spot. The actual fault could still be there...

Changing the MAF has plastered over the crack (back to inuendos).

Don't understand why boost is dropping off up hills. Rpm may drop slightly but corrected at the pedal to give more fuel, so why the pressure drop under load? Leak?

Right I'll get back to my AXG mapping...



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[Activ8]

You fucking beauty! I changed the MAF sensor yesterday, took it out for a drash down the link road. What a difference! No more overboosting sits bang on 15psi, and pulls up hill! There is still a small boost drop at 60mph/3k rpm, but it'll only drops down to about 8psi, so loads better than it was, and I now feels it's safe to drive again knowing boost pressure is safe. I think I still have a bit to play with but way happier than before

Dropping to 8psi is indicating a fault to me Sausages unless you drop off the revs. About 3k is a limp mode threshold, does it accelerate beyond 3k up the hill? AIT is cold this time of year, your van should be flying up the hill.

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[Dave Sausages]

Dropping to 8psi is indicating a fault to me Sausages unless you drop off the revs. About 3k is a limp mode threshold, does it accelerate beyond 3k up the hill? AIT is cold this time of year, your van should be flying up the hill.

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Yeap, that's what I thought as well. No it didn't continue to accelerate with the drop in psi, it lost power again, but I was much further up the hill this time and it started to level off meaning I didn't need to change back down to fourth. It did feel like a 'semi limp' (fnarr fnarr) in that for the rest of the journey it went quick enough but it didn't have anywhere near the same pull as before I went up that hill (it still boosted, but not up to 15psi), and it returned back to normal power after turning off and on again. I'd be interested to see what fault codes and readings are at this point.

[Activ8]

Are you using your remapped ECU? Assumed yes at 15 psi
Did Reg leave the OBD port in the engine loom for diagnostics? Also, get the mapper to send you the mapped file so we can check it... I'll order an EEPROM programmer next week and then we can have a real play... get Reg to fix up some aerodynamics for you.... 🏁😉

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[Dave Sausages]

I get 15psi readings on both ECUs, standard didn't give me enough pull for steep hills so fitted the tuned one mid journey. Yes the obd socket is still there. I'll send the mapper a msg via eBay, not sure how helpful he'll be though?