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I tow a 3500kg van with my D4 considering what's behind me I have never felt the D4 needed more power. It gets the job done. Unhitched only a power junkie would want more. That said its great to see other players getting into the D4 game. Roo Systems have done work on my MINI and the crew there are great.
Its all a matter of personal opinion if there producing more power its great to know its there. I personally don't mind a bit of extra power plus like said earlier these are not. Patrols with mechanical fuel pumps and no way of controlling heat. Also the injectors are no longer single big squirters an electronic injector operates up to 7 times per power strike depending on the manufacturer this also keeps the heats down as it is not continuously spraying the piston. Timing is now infinite and they monitor ambient heats so many ways of keeping the fuelling correct. Plus if you get a 245 hp tune you only have access to that 245 if you have a hill and your fit to the floor. The hills in dynos don't exist, plus with the power the cars make and the way they change gears you would be at max power only for a short time as soon after it would be to fast and you would be off the throttle. Just my opinion thou and its fantastic that company's are getting into d4s this can only mean more sales and more support and after market accessories and options
Sorry but this is completely misleading.Quote:
Originally Posted by josh.huber
No matter what your fuel delivery mechanism (commonrail vs mech pump etc) you cannot step outside the fact that burning fuel creates heat and more heat is required to produce more power.
As I have already stated in this thread, to increase power/torque without increasing EGT you must increase airflow through more boost. Due to the nature of thermodynamics and air compression the boost must increase substantially more percentage wise than your power/torque does.
All the controls a manufacturer puts into their ECU code to protect the engine are completely undone by an aftermarket tune. Is is misleading to say the factory protection remains. It doesn't.
How safe your engine is after a remap depends entirely on how good the tuner is and how well they understand the engine they are controlling. It is entirely possible to have one tuner melt an engine at a lower power than another can safely acheive. A bad tuner can also blow up your turbo(s).
It isn't peak power that melts diesel engines. It's high load at any rpm. Which is why EGT measurements while towing quickly sorts out which tunes are dangerous and which ones aren't.Quote:
Originally Posted by josh.huber
The (often misleading) idea that you can drive with a chip (or remap) and only use the extra torque/power when you want to, is even more misleading when you're towing a heavy trailer.Quote:
Originally Posted by Meken
Your engine ECU determines the instantaneous power/torque requirement, not your throttle position. Think of your throttle control as a "request" for a certain level of performance. The ECU will decide what level of fuel delivery/boost will be applied. Ergo, you may be applying a lightish throttle, but still comfortably maintaining speed up or down hills - many of you will have noticed the "ease" in which you cruise up hills when towing. It's not magic - underneath the car is working hard (it's even worse if you're using cruise control).
With a non-standard tuning, you'll quickly reach EGT levels that are dangerous. If you're lucky, the car will trigger an engine fault and reduce to limp status - I had this happen twice before I reasoned out and confirmed what was happening. I'll admit it was fun dragging off a Patrol whilst pulling a 3 ton van, but sanity (luckily) quickly returned.
If you're unlucky, you'll damage the engine.
Cheers,
Gordon
Cheers - I guess it's not like the old days where there was a cable between your foot and the throttle butterfly :)
So, is the risk (of higher EGT as a result of a remap) reduced if a remap is combined with a larger diameter exhaust (as per Roo Systems combined remap plus exhaust packages?)
cheers
How do you know that the was not just a bulk fuel dump to achieve power. Was that on a d4 Gordon
Chip or re map
Mitchell bros you guys started this thread and have done a map can you guys answer as to the complexity of the system and how it can stay inside the parameters
Good point!!