Hi,

I'd like to hear the turbo whine, but I do not have the muffler pipe Turbine Doc plugged with a freeze plug.

Things look alike as on the nice pictures he has on http://myweb.cableone.net/tbogemirep/, except that my airbox contains a filter plate, not the round one, and the inlet ellbow going from the airbox to the turbo is a bit different. It doesn't even have an opening for a muffler pipe.

What can I do to hear the whine? Is it somehow dampened by other means?

If it helps to determine my setup, I can make a picture and upload it tomorrow.


GH

If you have the stock exhaust, you probably won't hear it. The cat muffles it.


Replace it with a 3-1/2" system with just a straight through muffler and you should hear it. Will also get boost much quicker.

I have the stock exhaust but with the cat gutted and no muffler,Also have 5inch chrome exhaust tip.I also have a cone filter that comes straight off the turbo (K/N) Turbo whine is very nice.When i let off the gas you can hear it go "CHSSSSS" almost sounds like a rig taking off his air brakes.At stop lights when i take off like everybody else does you can really hear it.If i stomp on it its real loud.The whine level is right up there with the cummins.If you stand behind my truck at idle you can hear it spinning and when I turn it off you can hear it spolling down.http://www.dieselplace.com/forum/smileys/Approve.gifhttp://www.dieselplace.com/forum/smileys/Clap.gifhttp://www.dieselplace.com/forum/smileys/Big Smile.gif

Olee welcome to the site, I just posted the RPO list from an old thread it will help you determine what your ride came with originally. Once you figure out your setup post it in your signature line the info will help folks to help you with troubleshooting it and you won't keep having to repost the basic set up in every thread.

Thanks for your warm welcome and your suggestions so far!

Unfortunately, Germany regulations are utterly restrictive, thus I'm very limited in what I can do. In any case, I have to keep my car street legal.

However, this evening, out of curiosity, I took a closer lock at the airbox, actually pulled it out (found that I will need a new filter element soon).

There was no snorkel running through the fender well to the inlet of the airbox, but I found the inlet as restrictive as I've been reading about here. Now I can imagine what would happen if one would cut it out to let more air in: The engine would really run much better; the effect might be as it is when you put a K&N filter to a gasoline engine as replacement for the stock one. Eventually, the whine of the turbo could very subtly make its way out.

But won't you have to worry about EGT rising when more air comes into the engine? Or is that an effect of more boost only?


GH
Edited by: 0lee

The more air you can breath, the lower your EGT's will drop.

Camstyn,

that's good to hear :) It seems that the air temp at the intake isn't really high, either. I can put my hand onto the snorkel of the upper intake casting that directs the air from the charger into the intake, and it is just warm.

With an air-to-air charge air cooler like Turbine Doc has, I can imagine that the air temp will be about ambient temperature :)


GH

The turbo is a turbine-driven air compressor. Compress air (Boost)- generate heat.


Intake Air Temperature generally remains below 200deg F at 7psi Boost.


Reduce IAT by 100deg, EGT will drop by ~100deg.


Increase Boost while keeping IAT at ambient will further reduce EGT.


Charge-air cooling works, but not at idle - no Boost, or simply revving the engine - Boost not needed.


Boost is required to increase power under load - charge air cooling is needed.

gmctd,


Assume no charge-air cooling and IAT of 200* at 7 psi as your baseline. What's the efficiency loss when boost increases to 12 psi?

Hm, just a thought that came to my mind: If the intake snorkel would have been made with gills on it, like an FSD cooler has, IAT might be a bit lowered without much effort.

Install a ram scoop in the hood and direct the outsite air onto the intake tubing, and part of it to the airbox ...

Eventually, make the tubing longer to get more surface for cooling. It's about what a charge air cooler does, but without the need for one.

Iirc, decrease IAT by 10degF adds 1hp, as a general rule.


That hp is not a gain, it is a return of losses to heat.


I was seeing just over 200deg on long hard pulls at 7psi, with intervals between hills allowing cool-down. Ambient was about 75.


At 15psi temps were easily zipping past 200deg, requiring ease-off periods for cool-down.


PCM will manage fuel when factory limit, around 230~250deg, is reached.