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Posted: Tue Jul 07, 2009 8:46 pm
by beinthemud
tonkatuf wrote:There seems to be alot of talk about race car's here, but we are talking about a Diesel (no offence meant to diesel lovers).
Majority of Trucks are Turbo'd and diesel of course.
No offense taken
But point is made well
All the other point are well made but were talking about a rev range of a few thousnad
Mines 0-3500 and from memory an sc isnt making much more boost at 600rpm than a turbo ,turbos tend to make boost at low rpm just not much to have any effect (take alook at your boost gauge)
Posted: Wed Jul 08, 2009 9:10 am
by leehamescort
A small turbo will boost up early, the other advantage of the turbo is it is load sensitive. A turbo engine will free rev to 5000rpm and create 0 psi boost but load it up with on a hill in top gear and it'll be boosting 10psi at 2000rpm.
When you've picked too high a gear on a steep hill climb (And as we all know you should never try to snatch a nother gear on a steep climb in case you only find the dreaded "Angel" gear)
As the engine runs out of puff and the revs drop the turbo will hold boost and try to keep the engine running giving max power which might be enough to get you to the next break in the hill/washout without stalling.
Never owned a supercharged vehicle but would assume as that as the engine loads up and the revs drop in this situation the supercharger would lose power quicker as the boost is directly proportional to the revs.
Just a thought, might be wrong, but trying to think about the differences in real 4x4ing situations.
cheers
Leeham
Posted: Wed Jul 08, 2009 6:44 pm
by Kitika
Having never had a boost gauge fitted I dunno for sure but the boost hardly drops at all in those situations because it all depends on engine revs like you say and going up hills like that I never had much problem with the engine losing power. Maybe I just picked the right gear to start off with?