The message to which you are about to reply is shown first. GO TO REPLY FORM



 VIEW    REPLY TO THIS MESSAGE Replies to this message will be emailed.    PRINT   SAVE 

Re: Twin Turbo 700 88

posted by  someone claiming to be Pat on  Mon Nov 20 12:42 CST 2000 [RELATED]

Hi,

In another life, I worked on diesel engines tuning them for maximum horsepower for turbocharging. I have, but might have trouble finding, books on turbocharging theory and staging turbochagers. Tractor pullers stage turbo chargers to build more boost. Most NTPA open class diesels now run three turbos in series. The turbos are three different sizes. The idea is to build higher boost with each stage, compressing the air tighter and tighter. The air then goes to the air to air heat exchanger then into the intake manifold. High performance diesels are now building over 100 lbs of boost. Alchohol etc is pumped directly into the intake and the run or pull is ort of a run-away condition. They are not worried about lag time. The drivers slowly build boost..and turn on various fuel and alchohol sources as the clutch is loaded and rpms climb. They have outlawed most computer controled fuel devices leaving the driver to watch rpm, boost, and exhaust temperature gauges as he watches many many gauges. The whole pull is over in 15 or 20 seconds.

What does this have to do with volvo turbocharging. Lots. The turbocharging of a spark fired engine is much more complicated because of the balnancing of boost and spark not. It is my opinion that you are not looking for more boost from the mitsubishi, but boost over more rpms. To do this, you will need tighter waste gates or waste gate controlers. Or you will need tighter snails,(scrolls) which control the turbocharger rpm in relation to the amount of exaust gas, or if you twin turbo, you would want two small turbo chargers..not two full size turbo chargers. I could be full of crap because I do not know how much exhaust the mitsubishi now diverts at low rpm. My Guess is that the waste gate is not diverting any till the rpms build. I also have to smile and wonder if you realize the nightmare of building the mounts and plumbing required for multiple turbo applications.

Good luck,

I do have my 740 turbo project on the road. I love listening to my turbo spool up. There is a turbo shop expert in my area that is also familiar with bosch injection. I am reluctant to post thier name on the web, but might give it out with a personal email request.

I hope I have not offended any of your volvo experts with my ramblings.

Pat





USERNAME
Use "claim to be" below if you don't want to log in.
PASSWORD
I don't have an account. Sign me up.
CLAIM TO BE
Use only if you don't want to login (post anonymously).
ENTER CAPTCHA CODE
This is required for posting anonymously.
OPTIONS notify by email
Available only to user accounts.
SUBJECT
MODEL/YEAR
MESSAGE

DICTIONARY
LABEL(S) +
IMAGE URL *
[IMAGE LIBRARY (UPLOAD/SELECT)]

* = Field is optional.

+ = Enter space delimited labels for this post. An example entry: 240 muffler


©Jarrod Stenberg 1997-2022. All material except where indicated.


All participants agree to these terms.

Brickboard.com is not affiliated with nor sponsored by AB Volvo, Volvo Car Corporation, Volvo Cars of North America, Inc. or Ford Motor Company. Brickboard.com is a Volvo owner/enthusiast site, similar to a club, and does not intend to pose as an official Volvo site. The official Volvo site can be found here.