1968unclefester
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where can i hook up a boost gauge on 300tdi disco
also wondering about adjustable boost valve
also wondering about adjustable boost valve
boost gauge help
- Thread starter 1968unclefester
- Start date
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Matt TDi
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To get an accurate reading, you ideally want to take a pressure reading from the inlet manifold. However anywhere you can tap in aft of the turbo, or on a pressure line to the pump will give a reading.
1968unclefester
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so if i tap the inlet manifold and stick in a tail that will work
how about having adjustable boost
how about having adjustable boost
Matt TDi
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Yep, tap into the inlet manifold for the most accurate reading of what boost pressure the engine is seeing.
As for adjustable boost pressure, I really wouldn't bother. You can adjust the actuator for more boost, and adjust the pump for more fuel, but I don't see any benefit of having it adjustable, not on a TD.
As for adjustable boost pressure, I really wouldn't bother. You can adjust the actuator for more boost, and adjust the pump for more fuel, but I don't see any benefit of having it adjustable, not on a TD.
1968unclefester
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chears have done the pump ,
but didnt want to shorten actuator rod without having a gauge to monitor presure , have been told max is 2.0bar does that sound about right
what does stock boost come in at
chears Tim
but didnt want to shorten actuator rod without having a gauge to monitor presure , have been told max is 2.0bar does that sound about right
what does stock boost come in at
chears Tim
IanFiTheDwarf
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Stock boost is 1bar on a 300 tdi, 2 bar is way to much. I would think 1.2 bar is a safe maximum.
Fitting an adjustable boost valve of the type with a ball and spring not a bleed valve can have an advantage in that it will open the wastegate more suddenly at the preset pressure keeping it closed until you hit that pressure where as the standard set up will start opening well before 1 bar (maybe about 0.8 bar)
None of this extra pressure will do anything at all on a diesel unless you increase the fueling by adjusting the pump. There is also a fair bit of room for more fuel before needing to increase boost pressure on the 300tdi and without fitting a better intercooler first you are likely just to cause more problems.
Fitting an adjustable boost valve of the type with a ball and spring not a bleed valve can have an advantage in that it will open the wastegate more suddenly at the preset pressure keeping it closed until you hit that pressure where as the standard set up will start opening well before 1 bar (maybe about 0.8 bar)
None of this extra pressure will do anything at all on a diesel unless you increase the fueling by adjusting the pump. There is also a fair bit of room for more fuel before needing to increase boost pressure on the 300tdi and without fitting a better intercooler first you are likely just to cause more problems.
sible88
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I have tried this and it went like the clappers for 4 days yes 4 days. It spun the wheels in 3rd round a corner. Then it blew a hole in the block with the conrod snapped at both ends
Have pics lol
Second 300
Have full front intercooler with pump adjusted to what allisport advise and turbo rod shortened by two full turns and went ok but only lasted 5 months before the head gasket went and water in bore resulting in bent conrod :-(
Up to you!?!?!
Have pics lol
Second 300
Have full front intercooler with pump adjusted to what allisport advise and turbo rod shortened by two full turns and went ok but only lasted 5 months before the head gasket went and water in bore resulting in bent conrod :-(
Up to you!?!?!
IanFiTheDwarf
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I could not say whether your second 300s destruction was or wasnt caused by the tuning done to it.
The first one sounds like it was almost certainly caused by to much power but it also sounds like it had a lot more than a little tweak of the pump and waste gate actuator! Did you have a boost gauge or exhaust gas temperature meter fitted? Were you getting smoke on full throttle? And could the pump and turbo have already been altered before you made your adjustments?
If you do any adjustments to the turbo then at a minimum use a boost gauge while doing the adjustments and for a short while afterwards until you know all is ok and better still fit one permanently.
If you are making any more than minimal adjustments to the fuelling or suspect that adjustments have been made before then an exhaust gas temperature meter would be a very good idea.
The intercooler on the tdis is less than ideal for the standard tuning and will be very inadequate once any increase in fuelling and boost is done and will be the first thing I upgrade before I do any other tuning.
When you increase the fuelling on a diesel the exhaust gas temperature will rise and will rise a lot if there is not enough air. You will also get smoke when you go too far. Increasing the air will reduce the exhaust gas temperature and can be done by increasing the boost but when you increase the boost you increase the temperature of the air a lot and without adequate cooling you can actually end up with less air due to its density being lower. Installing a larger more efficient intercooler when the original is insufficient can increase the induced airflow even without increasing the boost pressure.
Just to complete the story as you try to get more from the turbocharger it gets less efficient and will heat the air more and more so there is a finite amount of airflow that can be practically achieved with any turbo. Generally a larger turbo charger can increase airflow by giving a cooler charge at the same boost pressure but will need a greater exhaust flow so will not provide boost until higher in the rev range.
Myself I will be fitting a larger intercooler, increasing the boost to 1 bar (I have a 200TDi which is only 0.7 bar) and making a small adjustment to the pump. But will only be aiming for about 20-25 bhp increase which I dont think will be anywhere near spinning the wheels in third.
The first one sounds like it was almost certainly caused by to much power but it also sounds like it had a lot more than a little tweak of the pump and waste gate actuator! Did you have a boost gauge or exhaust gas temperature meter fitted? Were you getting smoke on full throttle? And could the pump and turbo have already been altered before you made your adjustments?
If you do any adjustments to the turbo then at a minimum use a boost gauge while doing the adjustments and for a short while afterwards until you know all is ok and better still fit one permanently.
If you are making any more than minimal adjustments to the fuelling or suspect that adjustments have been made before then an exhaust gas temperature meter would be a very good idea.
The intercooler on the tdis is less than ideal for the standard tuning and will be very inadequate once any increase in fuelling and boost is done and will be the first thing I upgrade before I do any other tuning.
When you increase the fuelling on a diesel the exhaust gas temperature will rise and will rise a lot if there is not enough air. You will also get smoke when you go too far. Increasing the air will reduce the exhaust gas temperature and can be done by increasing the boost but when you increase the boost you increase the temperature of the air a lot and without adequate cooling you can actually end up with less air due to its density being lower. Installing a larger more efficient intercooler when the original is insufficient can increase the induced airflow even without increasing the boost pressure.
Just to complete the story as you try to get more from the turbocharger it gets less efficient and will heat the air more and more so there is a finite amount of airflow that can be practically achieved with any turbo. Generally a larger turbo charger can increase airflow by giving a cooler charge at the same boost pressure but will need a greater exhaust flow so will not provide boost until higher in the rev range.
Myself I will be fitting a larger intercooler, increasing the boost to 1 bar (I have a 200TDi which is only 0.7 bar) and making a small adjustment to the pump. But will only be aiming for about 20-25 bhp increase which I dont think will be anywhere near spinning the wheels in third.
