| [ Total Views: 691 | Total Replies: 3 | Thread Id: 97084 ] |
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 jamiesc
Wolfsburg Wizard
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| posted on May 26th, 2012 at 01:06 AM |
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turbo or superchared what is the best option
what is the ups and down and how extensive is installing one of them and how much stress is it on your engine any help much appreciated
cheers jamie
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tweety
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| posted on May 26th, 2012 at 11:20 AM |
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Jamie,
firstly read this about the fundamentals. http://www.superchargersonline.com/index.php?main_page=page&id=12
Will try to answer your question to a degree. But there is a great thread "blowing the bug" by Joel that not only is ahving his bug superchargerd
but he did it the easiest and prefered method -draw through which I have decided to do to my ea81 Brumby powered trike and I've started collecting
the bits. Its all happening.
People can correct me if I'm wrong in my explainations.
Turbo gets its propulsion from exhaust gses...so your headers need modifying there to install that part. Turboes are traditionally more suited to
high revving engines although they have come a long way in modern engines whereby low down power is achievable. Dont know anything more about
turboes.
Supercharging:
There are two systems- draw through and blow through. Both systems cause a fuel/air mixture to be compressed at a pre determined amount (psi). Easily
coined the phrases blow through means the air pump (thats essentially all a supercharger is) pumps air through a "sealed" carbie then into the
engine. With the 'blow thru' you can use an intercooler whereby the mixture is cooled prior to combustion allowing for more hp and cooler running.
This system is more work to set up. You can use a clutch type pulley on the SC with this set up.
Draw through or suck thru is the easiest bolt on power bang for buck. You find a suitable carbie (SU or Dellorto are prefered) and the fuel/air
mixture commenced before the supercharger. Then through your engine. you cant use a intercooler with this set up and have to use a fixed pulley on the
SC.
Superchargers run off a belt usually off the crankcase but I've seen pics of them running off the genny belt. They need a lot of belt "footprint"
so the belt needs to wrap around the pulley more than say a water pump. Best to use a seperate pulley unit. The boost ammount is calculated by a
fromula available on the net. just google it. you need a bit of info first. What boost is ideal. whatever you want! But over 6-8 psi things gets
hot, standard engine internals become vulnerable to breakage etc. If you want extreme performance go turbo. If you want good performance without
revving the guts out of your engine go supercharger.
Seeking say 5-6 psi is where I will go and Joel sort that also in his bug and got it and the performance made him very impressed. For em it willa
ssist in towing my van and make up for some power loss from ym auto trans. 30% extra power and torque is about what to expect. and very little drop in
economy.
There are many things to consider and "Blowing the bug" should be read....I have about 6 times now to get it clear in my head.
Cost:
You can purchase a Toyota SC12 from the web for around $400, Dellorto carbie say $300-500, two custom manifolds to make (although I am seeking one
half of a lynx twin carb Datsun 1600 manifold for between the carbie and the SC with slight mods) say $200, a blow off valve (dont skimp - I've
bought a turbosmart one universal 38mm for $300, air cleaner, and pulley mods say $200. pulleys can get from a wrecker.
Mke sure your engine is in good nick, if you havent yet install a large sump and good oil cooler, get info on water injection which can assist the
system and read up on thigns like retarding your ignition. I was green as a few weeks ago but all this will come together ok. then ahng onto your
hat!!
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68AutoBug
A.k.a.: Lee Noonan
Aircooled Master
Beetle Restorer - Experience over 138% - YIKES --
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| posted on May 26th, 2012 at 08:55 PM |
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| Quote: | Originally
posted by jamiesc
what is the ups and down and how extensive is installing one of them and how much stress is it on your engine any help much appreciated
cheers jamie
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Good article there by tweety
Main problem with turbo charging is the heat from the turbo in the engine bay...
Air cooled Beetles have a rubber seal around the engine to keep the heat below this seal.. along with the exhaust system
and turbos use hot exhaust gases...
so, not a good idea in a daily driver beetle..
supercharging is the way to go, as was used on beetles in the 50s & 60s..
these JUDSON superchargers are now worth their weight in gold... lol... vw gold.. lol
that's about all I can tell You
cheers
LEE
- [size=4]Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY--- [/size]
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jamiesc
Wolfsburg Wizard
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| posted on May 27th, 2012 at 10:58 PM |
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thanks for the all the info autobug and tweety im still just in the early stages of looking into it and thinking weather or not to leave it n/a so my
engine last longer ive read afair bit or the artical blowing the bug and has really got me thinking about the better way to go. atm i have a bigger
sump and external oil filter yet to buy an oil cooler for my body of rebuild
and then desiding cause ill be doing my engine last
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