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[DJ Pete]

So, if you bugger about with the waste gate actuator then you can up the boost........dont overdo it though or you risk over revving the turbo!

How simple is it to do, and how do I do it!!!!!

[TheBoy]

So is it chippable?

OH YES !!! and without a Maf There are certain other areas tht can be played with without the Maf pulling it back down!!!

You been buggering with the crude waste gate setup?

Would we do such a thing

I am surprised it didn't throw an over boost fault code from the inlet pressure sensor

We only adjusted the boost by a fraction - just under 0.1bar iirc.  Sadly, this wasn't on mine, which has a MAF

[Marks DTM Calib]

So, if you bugger about with the waste gate actuator then you can up the boost........dont overdo it though or you risk over revving the turbo!

How simple is it to do, and how do I do it!!!!!

I cant comment on how but, I suspect it involves little more than bending the actuator arm......unless you are silly enough to disconnect the actuator all together so the turbo waste gate always stays shut (would need to blank off the air feed to the actuator)!

[TheBoy]

So is it chippable?

OH YES !!! and without a Maf There are certain other areas tht can be played with without the Maf pulling it back down!!!

You been buggering with the crude waste gate setup?

Please tell me more!

Imagine the simplest most crude waste gate setup you have ever seen and then simplify it!

On the diseasel, the waste gate is normally closed and only opens as the boost pressure increases. The actual actuator is fed off the turbo boost pressure so as the inlet pressure rises, the waste gate opens therefore reducing the turbos rpm and maintaining a constant boost.

So, if you bugger about with the waste gate actuator then you can up the boost........dont overdo it though or you risk over revving the turbo!

Heres where it gets a little more difficult though, around 1997ish, a MAF was added to the setup to reduce smoke on full chat (to meet the regulations that were coming in) and this monitors the airflow. If it gets a bit high, it backs the fueling off to stop unburnt fuel exiting out the back James Bond style in a cloud of black smoke (because the smoke you see is unburnt fuel!)

This 'improvement' makes it harder to tune the old slug as your always fighting a few lines in code that are backing the fueling off!

Only, they didn't do a very good job of it - "My name is Boy, The Boy"

Actually, I keep forgetting to plug the MAF in on mine.  Tends to stay that way for weeks. First thing I notice is a stored fault code if I plug Tech2 in...

[TheBoy]

So, if you bugger about with the waste gate actuator then you can up the boost........dont overdo it though or you risk over revving the turbo!

How simple is it to do, and how do I do it!!!!!

Very, but don't be too greedy, as its easy to do a lot of damage.  You're better off with a chip.


Actually, just noticed you have a slush box.  I wouldn't do anything  

[Marks DTM Calib]

So, if you bugger about with the waste gate actuator then you can up the boost........dont overdo it though or you risk over revving the turbo!

How simple is it to do, and how do I do it!!!!!

Very, but don't be too greedy, as its easy to do a lot of damage.  You're better off with a chip.


Actually, just noticed you have a slush box.  I wouldn't do anything  

Does the actuator od have a threaded adjustment?

You might find actually that winding the boost up wont do a lot without the extra fueling of the chip anyway!

[Marks DTM Calib]

Only, they didn't do a very good job of it - "My name is Boy, The Boy"

Actually, I keep forgetting to plug the MAF in on mine.  Tends to stay that way for weeks. First thing I notice is a stored fault code if I plug Tech2 in...

Not surprising when you think that its only coming into play at the top end of the rev/boost range......plus as we all know, BMW dont light the fault light when things go wrong!

[DJ Pete]

Looks like I'd better get an AR35 and a chip then!

[TheBoy]

So, if you bugger about with the waste gate actuator then you can up the boost........dont overdo it though or you risk over revving the turbo!

How simple is it to do, and how do I do it!!!!!

Very, but don't be too greedy, as its easy to do a lot of damage.  You're better off with a chip.


Actually, just noticed you have a slush box.  I wouldn't do anything  

Does the actuator od have a threaded adjustment?

You might find actually that winding the boost up wont do a lot without the extra fueling of the chip anyway!

Yup

[TheBoy]

Only, they didn't do a very good job of it - "My name is Boy, The Boy"

Actually, I keep forgetting to plug the MAF in on mine.  Tends to stay that way for weeks. First thing I notice is a stored fault code if I plug Tech2 in...

Not surprising when you think that its only coming into play at the top end of the rev/boost range......plus as we all know, BMW dont light the fault light when things go wrong!

I didn't know there was any other home for the rev counter other than right at the top .

The one thing that does tend to bring it on is the 64 (?) which is a failing injection pump. I guess BMW feel they need to warn drivers that the repair bill is going to hurt

[TheBoy]

Looks like I'd better get an AR35 and a chip then!

Or a manual

[DJ Pete]

Looks like I'd better get an AR35 and a chip then!

Or a manual

Hmmm, I do miss changing gears, but being quite lazy the auto is the way forward, especially now that I'm getting so old (33 this month!)

I'm guessing it's much tricker to change auto for manual, than just auto to auto?

[Omegatoy]

So is it chippable?

OH YES !!! and without a Maf There are certain other areas tht can be played with without the Maf pulling it back down!!!

You been buggering with the crude waste gate setup?

Would we do such a thing

I am surprised it didn't throw an over boost fault code from the inlet pressure sensor

We only adjusted the boost by a fraction - just under 0.1bar iirc.  Sadly, this wasn't on mine, which has a MAF

lolol on that day yes but cn tell you it can go a lot more quite happily with no
adverse effects so far!!!!

[Omegatoy]

So is it chippable?

OH YES !!! and without a Maf There are certain other areas tht can be played with without the Maf pulling it back down!!!

You been buggering with the crude waste gate setup?

Please tell me more!

Imagine the simplest most crude waste gate setup you have ever seen and then simplify it!

On the diseasel, the waste gate is normally closed and only opens as the boost pressure increases. The actual actuator is fed off the turbo boost pressure so as the inlet pressure rises, the waste gate opens therefore reducing the turbos rpm and maintaining a constant boost.

So, if you bugger about with the waste gate actuator then you can up the boost........dont overdo it though or you risk over revving the turbo!

Heres where it gets a little more difficult though, around 1997ish, a MAF was added to the setup to reduce smoke on full chat (to meet the regulations that were coming in) and this monitors the airflow. If it gets a bit high, it backs the fueling off to stop unburnt fuel exiting out the back James Bond style in a cloud of black smoke (because the smoke you see is unburnt fuel!)

This 'improvement' makes it harder to tune the old slug as your always fighting a few lines in code that are backing the fueling off!

Nicely explained Mark and right on the money!!!!  

[TheBoy]

So is it chippable?

OH YES !!! and without a Maf There are certain other areas tht can be played with without the Maf pulling it back down!!!

You been buggering with the crude waste gate setup?

Would we do such a thing

I am surprised it didn't throw an over boost fault code from the inlet pressure sensor

We only adjusted the boost by a fraction - just under 0.1bar iirc.  Sadly, this wasn't on mine, which has a MAF

lolol on that day yes but cn tell you it can go a lot more quite happily with no
adverse effects so far!!!!

You bloody hooligan

You measured the boost now then?