Blow through turbo?

General_Failure Use your head, don't abuse it!

1,036 posts · joined Jun 2004 · 12 Jan 2009, 5:08 pm

#688929

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.

If at first you don't succeed. Build, build again.
Vehicle: 1975 Special order delivery walkthrough panel based LCA pop-top camper. Motor: Nippon 1.8L Single port Wasserboxer, Transmission: 3 rib 002.

VWCOOL 23 Windows of Awesome

5,158 posts · joined Jun 2003 · 12 Jan 2009, 10:08 pm

#689023

why not do a suck through?

Pay your debts, CxxT

Joel Now containing 100\% E-Wang

9,368 posts · joined Feb 2006 · 13 Jan 2009, 4:42 pm

#689166

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 Use your head, don't abuse it!

1,036 posts · joined Jun 2004 · 13 Jan 2009, 5:36 pm

#689181

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.

If at first you don't succeed. Build, build again.
Vehicle: 1975 Special order delivery walkthrough panel based LCA pop-top camper. Motor: Nippon 1.8L Single port Wasserboxer, Transmission: 3 rib 002.

Newt Wolfsburg Wizard

478 posts · joined Mar 2008 · 13 Jan 2009, 11:18 pm

#689254

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

Newt

It is as it is - If you didnt enjoy today, you've missed the opportunity.

General_Failure Use your head, don't abuse it!

1,036 posts · joined Jun 2004 · 5 Feb 2009, 9:50 am

#693507

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?

If at first you don't succeed. Build, build again.
Vehicle: 1975 Special order delivery walkthrough panel based LCA pop-top camper. Motor: Nippon 1.8L Single port Wasserboxer, Transmission: 3 rib 002.

Camo Custom Title Time!

1,936 posts · joined Oct 2007 · 8 Feb 2009, 7:24 am

#694008

General_Failure wrote: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

I thought rebuilding a VW would be cheap - Shit I was wrong, just don't let the wife know !!!!

Click here for my (slowy) modded 1961 Beetle build.

callook Casual Dubber

29 posts · joined Dec 2007 · 17 Feb 2009, 7:05 am

#695713

Any info on getting these one way valves?
😎

General_Failure Use your head, don't abuse it!

1,036 posts · joined Jun 2004 · 1 Mar 2009, 10:35 pm

#698054

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

If at first you don't succeed. Build, build again.
Vehicle: 1975 Special order delivery walkthrough panel based LCA pop-top camper. Motor: Nippon 1.8L Single port Wasserboxer, Transmission: 3 rib 002.