ppp wrote:The tuning the BMW 3.0 single turbo 204HP diesel (184HP as well, but let's stick to the last 3.0d that has been fitted into an e46) has some serious milestones:
First, the engine will respond to chipping quite nicely, up to 250 HP. This is the limit of the stock intake/intercooling/exhaust setup.
Intake - just like a gasoline engine, it will benefit slightly from a short-ram induction system. The powerband will shift a bit higher (by some 7-10 HP), however it will also be a bit narrower (full boost comes some 300-500 rpm higher).
Intercooling - the stock I/C will not cope with the mass of air that is being fed into the engine by a chipped engine. We need a big one. 3/5 of the radiator area and 2" thick. The stock visco radiator fan will need replacing for a thin one.
Exhaust - it's a cure for the intake handicap. With the stock turbo, we do not want (repeat: we DO NOT want) to change the downpipe. It would ruin the turbo response provided by variable geometry due to radical exhaust gas pressure change in a widened downpipe. The stock pressure regulation of VTG will not cope with a widened downpipe. Instead, we will want to fit a 3" exhaust, preferably with gutted/removed cats, to remove the quickly-cooling diesel exhaust gases (cooler=slower) from the exhaust. The engine will pull very strong to the redline.
Now we entered the outlaw territory. Such a car is not street legal.
So what? Now, inevitably, another remap comes to summarize all the small improvements. At this stage, the engine will produce 290-300 flywheel HP. If it's enough - stick with it.
If not, source bigger injectors (priceeeeey!) from a 335d plus fuel pressure regulators. Get a new, 255 fuel pump and another remap. You're in 315 hp range. Right on the limit of the engine internals and waaaaaaay overrunning the stock turbo.
These guys http://antandpete.vault5.com/mag0.htm did it more or less that way.
You can upgrade the turbo (if you happen to find a VTG turbo bigger than the stock GT2260V), but some serious internals improvements are a must at this point. Rods, pistons, valvetrain.
Or, swap a 335d engine into the e46. It has already been done in Poland, twice. And yes, one of the engines is chipped from 272 to 350 bhp and over 540 lbs/ft of torque. And yes, there is no need to swap the entire electronics of the car (especially the whole ABS system, which prevented such swaps a year ago) along with the engine.
Er ég að misskilja eða er þessi gæji að segja manni að fokka ekki í pústinu og hvernig það er í laginu? Eða bara að maður eigi ekki að stækka túburnar? Eða hvað?
Slæmt mál ef maður færi í einhverjar svona breytingar og það skemmdi fyrir turbóinu með því að skapa eitthvað þrýstingsvesen.
Hver er að skrifa þetta?
Ég get ekki lesið betur útúr þessu enn hann sé að væla yfir viðbragðinu þ.e hversu mikið eða lítið laggið er.
Málið er svo áfram að minni bakþrýstingur fyrir aftann túrbínu hjálpar við að minnka turbo lag. Þannig að þótt VGT kerfið geti ekki stýrt öllu sjálft þá ætti minni bakþrýstingur að hjálpa við lag sem VGT kerfið tapar, og búa til fleiri hestöfl þar sem að flæðið er meira útaf overall minni bakþrýsting.




