Sorry ...its amazing for ME to see...natürlich k.T.

Als Antwort auf: Re: BMW e28 Turbo many questions!!! von BGL-28td am 10. Oktober 2006 12:07:52:

Hi Jim,
its amazing for to see other people optimizing their e28 524td. I have already considered to replace the stock charger on my e28 by the smaller one of an e34 524td to get that quicker throttle response and a more dynamic torque rise without that characteristic plume of smoke (also seen on almost all comtemporary diesel passenger cars). Do you have any perormance data of your car to see what the preowner of the car intedented with this custom turbocharger? After all its very unlikely he grabbed the first one he found at an scrapyard after his original charger failed.
My aftercooler-equipped 524td has put out 164HP and 329Nm on a dyno-run some months ago, currently that seems to be little more thank to the lower ambient temperature in autumnal south-east-bavaria <img src=http://bilder.parsimony.net/smilies/zwinker.gif alt=zwinker>.
[<IMG src="http://www.pixel-pics.de/upload/1147643078.jpg" alt="http://www.pixel-pics.de/upload/1147643078.jpg[/link]]
But I also wonder if a smaller turbine would be able to sustain the much higher maximum boost pressure needed for a comparable engine performance at higher engine speeds.
Do you see any inscriptions or numbers stenciled on the housing of the charger?
Greets, Tom

Hi Bimmerfriend,
since I test-drove an BMW 524td of one of the gyus in the neighborhood some months
ago I was looking for one. Now I have bought a ´85 model from an elderly woman in
quite good condition. But what makes me wondering are the different performance characteristics of the two engines which presumably come from the different types of turbochargers. My bimmer has an small turbo with some external-looking wastegate:
<IMG src="http://img46.imageshack.us/img46/6482/ssa50187nx3.jpg" alt="http://img46.imageshack.us/img46/6482/ssa50187nx3.jpg[/link]
<IMG src="http://img175.imageshack.us/img175/679/ssa50188hf2.jpg" alt="http://img175.imageshack.us/img175/679/ssa50188hf2.jpg[/link]
The one of my neighbor is much bigger but with an standard wastegate:
<IMG src="http://img46.imageshack.us/img46/6393/ssa50189cq8.jpg" alt="http://img46.imageshack.us/img46/6393/ssa50189cq8.jpg[/link]
My diesel develops torque at already 1500rpm while the other puts out sufficient power not until 2500rpm. Anyway, my engine has an much quicker throttle-response.
So how about this differences? They are both 85-models. Had BMW switched to the other chargers during time of production? I have seen an engine of an 91 model 524td e34, too. It has an EGR but no external wastegate.
Regards, Jim