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    Thread: Mk1 1.8 20 valve turbo conversion - is it worth it?

    1. 02-21-2008 06:11 AM #1
      Im considering a 20vt swap in my mk1, im currently running a tuned mk2 gti 16valve - cams/rebuilt/4 branch manifold and have no problems with it, its very reliable and on a closed road have had 145mph out of it, will a 20vt have a bigger top end than that say with a bigger turbo? or is it a better avenue to look at turbo/supercharging the 16v lump, ive seen some turbo kits on the bahn brenner site but they all seem to be for mk3 2.0 16v ABF engines, also do the kits differ for left/right hand drive cars as on some american cars ive seen pics of the throttle body/air intake is on the opposite side of the inlet manifold?!?!? and on the RPM site they do supercharging on 16v blocks but id basically need a scrap corrado g60 to do that...

      anyone clued up on this??

      thanks

      baz


    2. 02-21-2008 07:04 AM #2
      i'd have to say you top end is still going to be around 145-150. i've seen 145 with my mkiv 1.8t. as for the throttle body placement it doesn't matter if it's right or left hand drive there are two different manifolds the 180HP VW has the throttle body on the right side and the 225HP audi has the throttle body on the left side. i think it has more to do with the inter-cooler pipeing than right or left hand drive.

    3. Member the.good.gli's Avatar
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      02-21-2008 07:54 AM #3
      it's not so much the engine but the gearing of the transmission that determines your top speed. also a mk1 isn't the most aerodynamic thing and i don't know if you want to go any faster in one. why the hell do you need top speed that high anyways?
      4900 posts as ea187 got me banned
      member since 4-23-2004

    4. 02-21-2008 12:15 PM #4
      A valid point on the top speed, it is a bit ridiculous to want to go faster than that, but one thing.... what sort of 1/4 mile time difference is there between a mk1 16v and a 20vt??? any ideas?


    5. Member chrisbmx68's Avatar
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      02-21-2008 12:48 PM #6
      100mph in a mkI on a public road feels like mach 12


    6. Member toplessvw's Avatar
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      02-21-2008 12:54 PM #7
      there are so many factors in this question that it is not even answerable in a simple way. There are many factors that effect what the car will do
      aerodynamics
      traction
      power output

      are you currently running a lsd?
      what engine management is on your 16 valve?
      what is your goal?
      what 1.8t engine code?

      if you have a healthy engine, maximise your current set up before you go throwing money away.


    7. 02-22-2008 03:07 AM #8
      Im not running an LSD, the KR 16v engine is on standard injection and management, the 20vt engine would be an APU code as apparently theyre less of a headache to install......

      My current 16v is healthy as ever, just im looking to redo paint and smooth the engine bay an i thought while the engine was out to do a couple of things to it, the cost and time seems to be going up with each fresh idea so i was just seeing if it would cost the same to drop a 20vt lump in.... ive seen 16v turbos push 300 brake (the lambourghini orange smoothed one from pvw a few months ago) but the 20vt is more power with alot less effort.

      main goal is to get 13 second 1/4 mile times, i haven't had my current engine on the strip yet (as my wheel bearing collapsed on the way to Bug Jam.... damn deep dish wheels)

      Would Throttle bodies be a better route?? what power increase do they offer? also what sort of MPG drop would they cause?


    8. 02-22-2008 03:08 AM #9
      that speed doesnt feel like mach 12 in mine :S cant really feel the speed (just hear it...) im a bit gutted as the whole reason i built it was for the super low go cart feel !!!

    9. Member chrisbmx68's Avatar
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      02-22-2008 06:44 AM #10
      drive a car made after 1999 take it to 100 then drive ur rabbit and tell me which feels safer

    10. Member toplessvw's Avatar
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      02-22-2008 09:40 AM #11
      if you are going to clean and shave the bay, have you thought about carbs? A nice dual 45mm set up would add to your top end and it looks nice ,clean and simple, mate that up with a tranny with a lsd and you got a quick car, with out that much effort. where as the 1.8t swap is more involved and the cost adds up pretty quick

    11. Member d-bot's Avatar
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      02-22-2008 12:48 PM #12
      Quote, originally posted by Welshsidedubber »
      but the 20vt is more power with alot less effort.

      ?

      Not true. I have a 300+ hp 20vT and it will cost a LOT less if you just turbo'd your 16v. Cams, pistons, rods, EVERYTHING is cheaper for a 16v. Boost it. Forget the 1.8t bs.


    12. 02-22-2008 01:09 PM #13
      that orange car your talking about has 300 whp with only pistons and a ported and polished head, and a big turbo... so getting a 16v to 300 is not that hard, or much work

    13. Senior Member vdubspeed's Avatar
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      02-22-2008 03:43 PM #14
      boost the 16V.
      Built > Bought
      58 Beetle | 79 Rabbit 20vT | 84 GTI TDI |84 GTI 16vT |12 Golf TDI ----99 QCSB Ram Cummins | 02 Burb 4x4 2500

    14. 02-27-2008 12:28 PM #15
      Say i was to boost the current 16v engine, where could i obtain the inlet/outlet manifolds? would a vw/audi/skoda 1.8t 20vt manifold be a direct fit?!?!?

    15. Member d-bot's Avatar
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      02-27-2008 06:43 PM #16
      Quote, originally posted by Welshsidedubber »
      Say i was to boost the current 16v engine, where could i obtain the inlet/outlet manifolds? would a vw/audi/skoda 1.8t 20vt manifold be a direct fit?!?!?

      16v not = to 20v for any parts as far as intake and exhaust.


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