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      08-21-2008, 05:06 PM   #1
iwant335i
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Exclamation Bmw 335d engine tuned

What are other tuning options for 335d except chiptuning and im talking about engine tuning to increase performance ?
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      08-21-2008, 05:14 PM   #2
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Do you mean in place of the remapping or after its been optimized ?
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      08-22-2008, 01:56 AM   #3
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larger uprated intercooler ... expensive though and approx 20bhp gains.
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      08-22-2008, 05:55 AM   #4
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uprated exhaust sytem...

I.e. Free flowing - Performance Particulate filter etc VERY expensive I would think, but probably the biggest gains to be had.

Matched with a good open filament air intake I would imagine you could see at least 20 30 hp.

I doubt the intercooler would have THAT much of an effect, has it been tested ? Seems to me the stock jobbie is pretty good, given the low volumes of air the turbos are actually pushing and the relative CRAP-NESS of our cold air.

Even on the petrol model the intercooler is a bit of a doubtful mod, Eugen seems to have had good results... Let's see what Tony's does. Tone you gonne get dynos before the intercooler with the re-map so we can really get a good benchmark ? Remember you'll need to let the car adapt to the new map too, so we're talking at least 50 70 miles between remap, dyno etc

SJ
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      08-22-2008, 05:59 AM   #5
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Quote:
Originally Posted by Serjames View Post
Tone you gonne get dynos before the intercooler with the re-map so we can really get a good benchmark ? Remember you'll need to let the car adapt to the new map too, so we're talking at least 50 70 miles between remap, dyno etc

SJ

Yes matey - will be doing that. But the remap will be with intercooler, so we won't necessarily know the improvements the intercooler gives exactly.. unless we go the long way round of dyno standard, dyno mapped, then dyno with map and intercooler...
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      08-22-2008, 06:24 AM   #6
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ahh, that's what I thought...

To be honest it might seriously be worth doing it the long way around otherwise we've got no base line for the re-map on it's own..


And if there is a problem you won't know what is causing it. i.e. too many variables... trust me I speak from experience as a Huge Birds bill will testify. I'd change one thing get it right, test it, and then put the Intercooler on. It's not like they're far away for you eh ?

SJ
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      08-22-2008, 07:20 AM   #7
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Best thing to do is visit Pistonheads forum and ask their advice on tuning the 335d..................
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      08-22-2008, 09:13 AM   #8
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Quote:
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Best thing to do is visit Pistonheads forum and ask their advice on tuning the 335d..................
... carlos get on with it
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      08-22-2008, 09:44 AM   #9
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PMSL.
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      08-22-2008, 03:18 PM   #10
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      08-22-2008, 03:30 PM   #11
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Quote:
Originally Posted by CD View Post
larger uprated intercooler ... expensive though and approx 20bhp gains.
it wont give any gains unless the map is altered. The stock item is sufficient on a re-map.
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      08-22-2008, 04:35 PM   #12
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Quote:
Originally Posted by MOB View Post
Best thing to do is visit Pistonheads forum and ask their advice on tuning the 335d..................

Might even ask them whats the fastest 320D too lol...im mates with Carsplosh ....does it mean ill get labelled too lol.
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      08-23-2008, 04:18 AM   #13
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Quote:
Originally Posted by dxb335d View Post
it wont give any gains unless the map is altered. The stock item is sufficient on a re-map.
Im afraid intercoolers on Diesels do make a difference mate. They lower the charge temperature of the air, thus making it denser and thus increasing power. Diesels love large Intercoolers, we have a double core item that we supply. The origonal design was made for our first 304bhp 330d back in 2004, but they fit even the 184bhp 330d and the current E90 330d...
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      08-23-2008, 04:26 AM   #14
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Quote:
Originally Posted by Ant397 View Post
Im afraid intercoolers on Diesels do make a difference mate. They lower the charge temperature of the air, thus making it denser and thus increasing power. Diesels love large Intercoolers, we have a double core item that we supply. The origonal design was made for our first 304bhp 330d back in 2004, but they fit even the 184bhp 330d and the current E90 330d...
Oh right. so the stock intercooler is bang on its limit on a mapped 335d ant?

I thought a larger one would only been needed if the current one was not upto the job. If the stock item wasnt surely limp mode would be seen quite often on a hot day?
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      08-23-2008, 04:40 AM   #15
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Quote:
Originally Posted by dxb335d View Post
I thought a larger one would only been needed if the current one was not upto the job. If the stock item wasnt surely limp mode would be seen quite often on a hot day?
?

Limp home mode will not activate because the air intake temparture is slightly warmer. Not even you could get you car to limp home based purely on a stifling hot and humid day compared to a crisp winter's day.

Having slightly hotter air (by a few degrees) is not going to overheat any of your engine components, which may run in a relatively much, much higher temperature range by default anyway.

It will reduce the efficieny of the burn cycle, reducing power slightly.

D.
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      08-23-2008, 04:53 AM   #16
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Surely if its too cold `tho it will also reduce efficiency ? Isn`t this why diesel consumption goes up slightly in the colder months ? With an air to air intercooler if you increase the size of the intercooler, surely the boost pressure will drop in relation to the increase in volume of air ?
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      08-23-2008, 05:28 AM   #17
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Cold air has more oxygen.....always helps.

Quote:
if you increase the size of the intercooler, surely the boost pressure will drop in relation to the increase in volume of air ?
Once the intercooler is 'full' the pressure is unaffected? Or am i having a thick moment?
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      08-23-2008, 05:36 AM   #18
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Quote:
Originally Posted by mikem View Post
Surely if its too cold `tho it will also reduce efficiency ? Isn`t this why diesel consumption goes up slightly in the colder months ? With an air to air intercooler if you increase the size of the intercooler, surely the boost pressure will drop in relation to the increase in volume of air ?
I'm not familiar with the relative change of denisty of air due to temperature (while since I dabbled with Boyle's law), but it is also worth considering the density of air entering - as even if the volume remains constant the actual density will increase at lower temperatures = more potential energy.

I suppose it will also depend on your air intake velocity, but with the venturi arrangements a lot of intakes have I'm not sure the effect of lessening backpressure if your intake diameter (due to larger bores internally) would have a big effect on actual intake velocity. As long as your air meets the intake at roughly the same velocity, but cooler then it is worthwhile.

All back of the envelope assumptions - I don't have direct experience with Diesels and intercoolers.

D.
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      08-23-2008, 05:45 AM   #19
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Not really sure. Boyles law states that Pressure x Volume remains a constant but that assumes the temperature is unchanged.
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      08-23-2008, 05:53 AM   #20
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Most people do not understand the diferent properties of petrol and diesel fuels and try to use petrol tuning techniques on diesel engines. Think of a petrol engine as a pump, the more air it can consume the more power it will make. You can make it consume more air by either increasing the capacity or increasing its volumetric efficiency. Don't worry about the fuel, it's easy to squirt in as much petrol as required. A diesel engine however is fundamentally different in that although you can increase the amount of air in the cylinder, simply squirting in more fuel only does so much as it is inhibited by its speed of burn and in the worst case the piston will reach the bottom of the stroke with unburnt fuel in the cylinder. This is the reason why diesel engines do not rev as highly as their petrol counterparts.

Combustion chamber design and injection improvements have made the diesel what it is today and have raised the rpms of modern engines, but there will always be the problem of trying to get the fuel to burn quickly enough.

Regards

Chris
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      08-23-2008, 06:09 AM   #21
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Quote:
Originally Posted by mikem View Post
Not really sure. Boyles law states that Pressure x Volume remains a constant but that assumes the temperature is unchanged.
Exactly, if your intake volume is constant, but you vary the temperature you vary the density (which means more mass of oxygen per volume). More oxygen helps the combustion phase, releasing more energy. This is, as I assumed above, if the intake pressure is pretty constant.

In the olden days , I used to skim my cylinder heads to increase the compression to take advantage of this rule. But you hit a limit due to the properties of the fuel (and the drastic reduction in lead in the mid-80s) which meant it was always a balance between ignition advance/pre-detonation (pinking) and more power. The holy grail of the most efficient combustion cycle.

Similary, though conversely with forced compression engines running relatively low compression ratios.

D.
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      08-23-2008, 08:12 AM   #22
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So will fitting a larger intercooler to a stock 335d increase BHP? Without altering the map?
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