Toymods Car Club Inc: Tech & Conversions => Another turbo question

Toymods Car Club
www.toymods.org.au

F.A.Q.

Home

Members

Toymods » Tech & Conversions » Another turbo question Show: Today's Posts :: Show Polls Email to friend

Author

Topic

Norbie
Forums Junkie

Location:
Brisbane
Registered:
May 2002

Re: Another turbo question

Thu, 09 September 2004 10:43

d-shiznit wrote on Thu, 09 September 2004 20:05

I would think that an engine reving in neutral at say 4000rpm would produce the same amount of exhaust gases as an engine reving at 4000rpm under load..

Definitely not. The volume of exhaust gases produced is proportional to the amount of power generated by the engine. An engine revving at 4000rpm is developing bugger-all power (just enough to overcome internal friction and pumping losses), but an engine accelerating a 1000+ kg lump of steel at 4000rpm is obviously developing a great deal more power!

So there's your answer; the lightly-loaded engine is developing very little exhaust gas, hence the turbine is developing very little power, hence there is no boost.

On top of this, the throttle butterfly regulates the manifold pressure - so even if the turbo is developing 3 bar of boost, there will still be a vacuum in the manifold if the throttle is mostly closed.

[Report message to a moderator]

[Message index]

-=] Back to Top [=-

Current Time: Tue Jul 29 14:42:46 UTC 2025

Total time taken to generate the page: 0.0041141510009766 seconds

.:: Contact :: Home ::.