Porks bike carbs and boost project

[Enuo]

Manifold vacuum vacuum is dependant on how much restriction the throttle body is giving. If the engine is demanding more air than the tb is allowing to pass a vacuum is created. The difference between demand and supply is proportional to the vacuum. The more vacuum the more the bypass should open, or at least that is my understanding of it.

 

[pork]

Sorry, this is how it actually is.....promise lol

 

[pork]

Right, tomorow il try and rig up another gauge in the boost pipes

Somone remind me too

 

[Enuo]

Just looked and apparently I'm wrong, it is on or off...

 

[Enuo]

Are you using a 4 rib belt? Maybe the belt isn't man enough?

 

[pork]

5 rib mate

 

[Enuo]

How many degrees of contact do yiu have on the pulley?

 

[Enuo]

For the crank pulley and for the sc pulley

 

[pork]

That's a good question and somthing il look into in the daylight

It's between 3 pulleys, clutch charger and belt tensioner

 

[pork]

Looks a bit like this.....

So maybe move the tensioner to give more contact to the s/c pulley

 

[Enuo]

Might need to add idlers somewhere to change the contact angle:

 

[pork]

Bit tight down there!

I think your onto a winner though, never really considered the amount off contact needed

 

[Enuo]

Lol, me and SirChris got talking about belt drives:

Theres a lot to consider haha

 

[h701micra]

Neil... this is getting complicated

 

[pork]

Was always gunna be this way lol

 

[pork]

Baby and mrs asleep, so had an hour spare to myself and went about removing the supercharger assembly

If you can imagine it, the original belt line wasfollowing the diagonal line off black/primer paint, jus left of the supercharger pulley

I can fit an idler pulley here, and move the tensioner pulley, without to much hassle
......will this be enough belt contact? If not in ginna have to redesign rhe whole thing

 

[Enuo]

160-180 degrees of contact should be ideal Neil

 

[pork]

Cool, il bust out the welder tomorow and stick it togeter

 

[Enuo]

Remember, if it is on the taught side of tge belt, the idler will need a fairly beefy mount

 

[pork]

Il over do it, just to be safe

 

[pork]

Me and my girl playing around with fuel maps

 

[jamier2007]

Is she getting the hang of it? Haha

Sent from my Nexus 4 using Tapatalk

 

[pork]

Better than me

 

[pork]

Got bearings for new puller from old alternator

Cut out middle to take bearings, pressed in

All tensioned up.....loads more belt contact to supercharger pulley now

 

[SirChris]

I need update dude

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[pork]

I need update dude

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That's as far as I've got today

Il try stuck it all back on later and see if this cures the squeal

 

[SirChris]

That's as far as I've got today

Il try stuck it all back on later and see if this cures the squeal

Good man

Sent from my Galaxy Nexus using Tapatalk

 

[pork]

I'm going as fast as I can

 

[pork]

Anyone wanna explain how I set up a fuel ve table?

 

[frank]

Anyone wanna explain how I set up a fuel ve table?

paul (pollyp) explained it in his blog iirc neil (waaay over my head tho )

 

[pork]

Il buzz him a msg, he always gives a in depth explanation

I only ask coz it runs really rich when boost comes on, (AFR reading of 9)

 

[Enuo]

Does that mean it's not slipping anymore?

 

[pork]

Haven't put charger back on yet, just turbo
Need to find free hour or 2 this weekend

 

[pork]

Well it didn't work

Here's a vid of it slightly holding the throttle, then jamming pedal to the floor
Opinions?

 

[pork]

My belt tensioner is fixed.....would a sprung loaded tensionr be better?

 

[Enuo]

The faster a belt goes, the more centrifugal forces stretch it out and lose you grip. I'd now look carefully into the vw setup. Check what type of tensioner they use, how much belt contact is on each pulley, how tight it needs to be... Remember you're running more load than on the sc than vw ran, so you might even need a wider belt/larger pulley

 

[pork]

The vw does use a spring tensioner

But this means completely redesigning my s/c and clutch assembly

 

[Enuo]

Well, at least you've learnt a few things:
Degrees belt contact
Spring tensioner
Belt speed

You also need to look at whether you need to tension the tight or slack side of the belt (load or non-load) for best grip.

Have you tried belt dressing spray yet?

 

[frank]

i would just run the s/c like nos personally neil, so that it was coasting/off clutch most of the time, then hit the button whenever you wanted instant boost
i dont think i could stand that racket all the time

 

[pork]

Il try the spray stuff, anything worth a go

Really don't have the time to redisgn it to experiment, wanna get out thus year and come to shows and meet a few of you lot lol

The whine I like, the squeal is horrendous

I can't see why it won't work, the belt is tight as a drum,

 

[h701micra]

It's not overly tight is it? :/

 

[pork]

T th

 

[pork]

Can that be a thin

 

[pork]

Thing!, dam phone

 

[Enuo]

Too tight and there might not be enough elasticity left to propely grip the pulleys

 

[frank]

nah, the engine and s/c are fighting each other for air

 

[pork]

So what can I try in it's current state

 

[Enuo]

I'm with Frank, Nos style microswitch under accelerator pedal for the SC.

 

[pork]

Il ray what's been suggested, then have a rethink

It should work as it is

 

[pork]

This is current arrangement with tensioner on top

Only thing left to try is this

Here's the vw set up