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Hi all I've got a B2 Audi 80, wanted a bit more something from the engine. Was going to fit some bike carbs I have lying around, but a spontaneous eBay session has landed me with a supercharger from a 1.4 golf..... My question is, once I've got it bolted on, what carbs (make and size) would people suggest? The engine is 1800cc and revs to a Max of about 5-6000 rpm I'm hoping to just add a little boost, not loads, and is there anything else I should change like ignition stuff, was going to replace it for newer parts anyway
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sowen
Club Retro Rides Member
Posts: 2,245
Club RR Member Number: 24
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Superchargers and Carburetorssowen
@sowen
Club Retro Rides Member 24
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I'd be looking at a single SU HIF44 from a Metro, Maestro or Montego turbo, or rebuild a regular HIF44 with the turbo specific parts and run it blow through. Plenty of information on how to plumb them in on the internet. For the ignition, Megajolt and EDIS 4 is quite simple and well proven.
How is the Golf supercharger plumbed in?
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My plan was to bolt the charger onto the manifold where the carb is atm, then put a slightly bigger carb on the intake of the charger? So no blow through things required, just lots of sucky squishiness
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In which case a big SU seems the trodden path. Lots of doom and gloom stories on the net re running an Eaton supercharger as suck through - Teflon coming off the vaines?rotors? You'll need to retard the ignition when boosting somehow.
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So really a blow through carb would be needed? :/ all the ones I've seen are quite expensive haha, the charger only cost me 100 quid
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sowen
Club Retro Rides Member
Posts: 2,245
Club RR Member Number: 24
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Superchargers and Carburetorssowen
@sowen
Club Retro Rides Member 24
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You'll run into problems and be told you've done it wrong whichever way you do it I've got plans to do something similar on one of my projects with a supercharger, running it ahead of the throttle and having a mechanical bypass and intercooler to help keep the intake temps down. If I wasn't on efi I'd stick with blow through SU's as I know my way round them from a turbo install. I think but could be wrong the supercharger you have coming from a Golf may have had a mechanical bypass and mounted before the throttle which would suit a blow through carb. If someone could confirm then it's worth researching further.... editIs the blower from a modern VW tsi thing and not an older G40/G60? I'm thinking of the latter!
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Last Edit: Aug 3, 2016 15:37:08 GMT by sowen
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Yeah it's from a modern 1.4 tsi which from researching I am kinder the assumption is turbo and supercharger?
I've also been getting g mixed views from the web, I mean for ease of setting up and using my existing knowledge (as I'm more of an ECU, injector, turbo person) then using the charger as a draw through set up seems best
But also a lot of people have said the gas air mixture can help lubricate/seal the chargers spinny blade bits (don't know what they're called lol) and also help cool them?
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hario
Part of things
S202 C300STD
Posts: 421
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Yeah it's from a modern 1.4 tsi which from researching I am kinder the assumption is turbo and supercharger? I've also been getting g mixed views from the web, I mean for ease of setting up and using my existing knowledge (as I'm more of an ECU, injector, turbo person) then using the charger as a draw through set up seems best But also a lot of people have said the gas air mixture can help lubricate/seal the chargers spinny blade bits (don't know what they're called lol) and also help cool them? Draw through is definitely simpler, solid mount the Eaton onto the inlet manifold and draw through an SU or a Webber or something. Thinking about it as you can buy an Eaton kit for a A-series mini engine which draws though an SU, that means (vmaxscart? / etc) can sell you a needle designed for a draw through SU to drop in.
Then you can just unbolt / throw away all the bypass/recirc bits on the Eaton, and Robert's your mothers brother.
The fuel vapour from a draw though carb in the Eaton closes up the tolerances making it more efficient
Dead simple..
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Last Edit: Aug 5, 2016 8:22:24 GMT by hario
*S202 C300TD Wagon* Installed: OM606 & 722.6, Evo6 IC, S600AMG callipers & 345mm rotors. No catz. Leatherish seats.. Rust.. Future: DIY manifolds & turbo compound build. Built IP, & some kind of software. Less rust..
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Another quick question... how easy should they be to turn? It came in the post the other day, but it's quite stiff. I've read you should be able to do it with two fingers, but it needs either a firm grip of a hand or a spanner to do it easily? That's not right I'm guessing?
Might take it apart and check the bearings
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Last Edit: Aug 5, 2016 15:24:25 GMT by code109
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drawing fuel through the blower will crack and peel the teflon on rotors after 100 or so miles (then it makes one hell of a noise as it rubs the casing - that's from experience) due to the coating not being spec'd for fuel as it normally runs dry in OE Efi setups. For that reason Metro or Renault 5 turbo blow-thru carb would be a better choice
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hario
Part of things
S202 C300STD
Posts: 421
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Aug 10, 2016 12:29:19 GMT
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Another quick question... how easy should they be to turn? It came in the post the other day, but it's quite stiff. I've read you should be able to do it with two fingers, but it needs either a firm grip of a hand or a spanner to do it easily? That's not right I'm guessing? Might take it apart and check the bearings It should be easy to turn over, definitely not stiff. Time for a refund..
Interesting fact I found out the other day, the little bypass butterfly in most Eatons is controlled by a vacuum solenoid (referencing manifold vacuum) and is to ensure smooth idle speed, because positive displacement blowers produce boost at idle it makes tuning difficult unless bypassed at idle (for petrol engines...).
Fair point on the Teflon BMW man, shame that.
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Last Edit: Aug 10, 2016 12:30:31 GMT by hario
*S202 C300TD Wagon* Installed: OM606 & 722.6, Evo6 IC, S600AMG callipers & 345mm rotors. No catz. Leatherish seats.. Rust.. Future: DIY manifolds & turbo compound build. Built IP, & some kind of software. Less rust..
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