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Kev,
That is about 240 kPa absolute (assuming sea level ambient pressure)... quite close to the overboost cut-off point of 242 kPa (in my books, someone knows better pls correct me!).
Now out of curiosity what is your steady full boost pressure? (i.e. @ max motorway allowed speed).
Cheers
Matt
Matt .... remerbering that my tires are 4% oversize, and I have a full length (2m) Rhino alloy tray on the roof (which is a bit of a parachute) .... and they vary depending on load carried, headwind, etc ... these are as per my GPS for road speed.
AT 80kmhr ... 1800rpm ... 0.32-0.38 BAR (0.36 = 5.22psi) - speedo says 75
AT 90kmhr ... 2050rpm ... 0.58-0.62 BAR (0.60 = 8.70psi) - speedo says 85
AT 100kmhr ... 2200rpm ... 0.76-0.80 BAR (0.78 = 11.31psi) - speedo says 95
... as best as I can remember.
Your boost doubles from 80kmph to go only 20kmph faster :eek: Wow, that must be an effective parachute up there.
If I am not completely wrong any increase in boost pressure/air volume is useless from the point of performance gain if you don't increase the amount of fuel accordingly. This will involve remapping of the ECU. Please correct me if I am in error.
Yep you are in error in part. An increase in boost will drop EGTs and provide a performance increase. In the case of the TD5 ensuring boost is optimum is noticeable. However big increases in boost without corresponding increases in fuel and changes to intercoolers will be noticeable but limited in effect.Quote:
Originally Posted by Jojo
Cheers
Sent from my iPhone using Forum Runner
At times like this I'm glad to be just a fossicker ;)
It becomes more of a case of a bit more boost, sooner .... ie:more boost down low.
I've heard that in somecases,you can't get very high boost,unless you add extra fuel..Quote:
Originally Posted by strangy
Once a TD5 is highly tuned, the standard M8 Exhaust Manifold studs can have problems, some times even if the manifold webbing has been removed. The higher tensile and longer 10.9 / 12.9 M8 studs with spacers from JE Engineering UK are an improvement, and are basically cut-down and re-threaded High-Tensile M8 Allen Bolts.
For some, even these mods have not worked, so up-sizing the studs to M10 have finally brought the Exhaust Manifold under control. The problem with this is, even though the drilling and re-threading can be done with the cylinder head still on the engine block, it really is better done with the head off.
Yes it certainly seems that way. My Disco feels spry when I am on the gas slightly or moderately. But when I need to pass a truck it feels like it has asthma.Quote:
Originally Posted by Fluids
My last rig was an hdj80 with a bigger turbo and intercooler kit. It may have spoiled me. But then it was consuming several more liters.