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Blow through turbo?
General_Failure - January 12th, 2009 at 05:08 PM

G'day.

I've only had a theoretical exposure to forced induction, so I have questions to ask about blow through forced induction.

I've been toying with teh idea of doing a blow through turbo setup on my van, especially since getting the weber progressive manifold and carb setup.

It seems like the D(F/G)(A/E)V carbs can be used for blow through induction with few mods.

For the distributor it's easier to use an advance/retard dissy or a mech advance only unit right?

Does the vac line for the brake booster need a belt driven vacuum pump?
I saw an alternator with combined vac pump on ebay. Guess that could be used if I could get a belt to it (Type4 motor. No belt related cooling worries)

How is fuel pressure regulated? I guess it'd have to be ran at a few PSI above manifold pressure. how does that work?


I think that's it; Just something I'm playing with in my head.

VWCOOL - January 12th, 2009 at 10:08 PM

why not do a suck through?

Joel - January 13th, 2009 at 04:42 PM

blow thros are a pig to jet and tune for a first timer and for no real benefit
budget ignition u cant beat a limited 009 - not locked!
and fuel u will need a boost sensitive regulator, return line and a pump that puts out more PSI than the boost u plan on running

General_Failure - January 13th, 2009 at 05:36 PM

Interesting.
I can do what I like in the playground of my mind.
Thought it'd be more complicated, and it's not as if I'd need lightning response times in a camper. Just an idea I have been toying with to help it out in the upper rev/speed range more than anything else.

Newt - January 13th, 2009 at 11:18 PM

Is an IHI4 too small for a 2 litre on normal road use?


Newt

General_Failure - February 5th, 2009 at 09:50 AM

All good. Thanks for that.
yeah I can't see a benefit of blowthrough for my possible application anyway. Not like I need wicked fast response etc. I just want something to help it out a little on the hills, and flat really.

My setup already has enough torque that it can be hard to get it moving without spinning the wheels, but it needs a bit more topend power.


edit: talk !=torque. Did I have a stroke or something?

Camo - February 8th, 2009 at 07:24 AM

Quote:
Originally posted by General_Failure
G'day.

Does the vac line for the brake booster need a belt driven vacuum pump? I saw an alternator with combined vac pump on ebay. Guess that could be used if I could get a belt to it (Type4 motor. No belt related cooling worries)



You wont need a pump as you are talking about, you place a one way valve in the vacuum line to the booster. So when under boost, the boost pressure wont get to the brake booster and the brake booster is still holding vacuum for that next brake application. And if you are back on applying the brake, you should be off the accelerator so there is vacuum again to the booster. Hope that makes sense.

Kevin

callook - February 17th, 2009 at 07:05 AM

Any info on getting these one way valves?
:cool:

General_Failure - March 1st, 2009 at 10:35 PM

I thought the thread was long dead. Thanks for the great one way valve explanation. Thats absolutely brilliant.