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    Thread: straight line race: ahu jetta tdi vs alh jetta tdi?

    1. Banned 85_305's Avatar
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      04-03-2012 03:42 PM #1
      Odd question, I know, but I'm very curious to know what a good 500lbs less that the 98 ahu jetta is carrying around can do when compared to the same motor with the same power in a car 500lbs, give or take, heavier. Any experience or input?

      I know that every hundred lbs is equivalent to 10hp, or .10 of a second in a drag race. Using that basis, it seems that stock vs stock the older mkIII jetta should eat up the heavier mkiv jetta.

      Opinions and input?
      Last edited by 85_305; 04-03-2012 at 03:58 PM.

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      04-03-2012 04:04 PM #2
      the ALH should go better because of the VNT.. the powerband is much nicer with the VNT.

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      04-03-2012 04:07 PM #3
      better yet... who cares?

      this is another POINTLESS question..

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      04-03-2012 04:07 PM #4
      how long is a piece of string?

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      04-03-2012 04:09 PM #5
      brings back memories of THIS THREAD

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      04-03-2012 05:11 PM #6
      Quote Originally Posted by Glegor View Post
      the ALH should go better because of the VNT.. the powerband is much nicer with the VNT.
      While the vnt is quite great, I dont think that a simple mechanism in a car 500lbs+ heavier is going to equalize the playing field...

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      04-13-2012 10:57 AM #7
      Quote Originally Posted by 85_305 View Post
      While the vnt is quite great, I dont think that a simple mechanism in a car 500lbs+ heavier is going to equalize the playing field...

      obviously this guy has never driven a car with an upgraded turbo, aka 'simple mechanism'


      yankin your chain man
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      04-13-2012 12:00 PM #8
      So what do you think? The ahu vs the alh an equal straight-line battle? Or does the 500lbs lighter mkiii win?

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      04-13-2012 01:21 PM #9
      ahu wins low down, alh wins above 80mph when the k03 is choking down and the vnt is flowing buttloads of air.
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      04-13-2012 01:56 PM #10
      Ah that makes sense... The kkk is TINY!

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      04-13-2012 02:03 PM #11
      Quote Originally Posted by 85_305 View Post
      Ah that makes sense... The kkk is TINY!
      anything over 3500, maybe 4000 rpms is just making the turbo a restriction..

      i would rip the AHU out of the mk3, find a REALLY CLEAN mk2 GTI, or Jetta Coupe, and put a mechanical pump (or a full electronic swap if its a CE2 car) on the engine, a big turbo, and call it good..

      then it will be FAST, and handle BETTER THAN the mk3 or bloated mk4..

      plus, you can do nose wheelies with good brakes on a mk2..

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      04-13-2012 02:19 PM #12
      What exactly is so bad, particularly, about the kkk? The dinky compressor?

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      04-13-2012 02:55 PM #13
      Nose wheelies!? Are you serious

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      04-13-2012 03:39 PM #14
      Quote Originally Posted by Glegor View Post
      anything over 3500, maybe 4000 rpms is just making the turbo a restriction..

      i would rip the AHU out of the mk3, find a REALLY CLEAN mk2 GTI, or Jetta Coupe, and put a mechanical pump (or a full electronic swap if its a CE2 car) on the engine, a big turbo, and call it good..

      then it will be FAST, and handle BETTER THAN the mk3 or bloated mk4..

      plus, you can do nose wheelies with good brakes on a mk2..
      Did this with a friend of mine to his 90 jetta coupe. 2.5" exhaust, fmic, nozzles, still on stock tune with timing and iq fine tuned. Running 15psi. Full electronic dbw. Made 62mpg highway and around 15sec 1/4 mile.

      Great car, and reliable too, with almost all oem parts! Still uses mk2 cluster and full votex/recarro trophy interior. Nice ride to say the least.
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      04-13-2012 03:41 PM #15
      Quote Originally Posted by 85_305 View Post
      What exactly is so bad, particularly, about the kkk? The dinky compressor?
      It is small to reduce lag, and in turn, becomes a restriction at high flow situations aka high rpm.

      Ahu with k24 on it is where it's at. May not be the fastest possible, but a monster all the same.
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      04-13-2012 04:29 PM #16
      Quote Originally Posted by fastinradford View Post
      Did this with a friend of mine to his 90 jetta coupe. 2.5" exhaust, fmic, nozzles, still on stock tune with timing and iq fine tuned. Running 15psi. Full electronic dbw. Made 62mpg highway and around 15sec 1/4 mile.

      Great car, and reliable too, with almost all oem parts! Still uses mk2 cluster and full votex/recarro trophy interior. Nice ride to say the least.
      Whoa!!! Thats sweet!!!!! I'd be down for something like that hehe

      Quote Originally Posted by fastinradford View Post
      It is small to reduce lag, and in turn, becomes a restriction at high flow situations aka high rpm.

      Ahu with k24 on it is where it's at. May not be the fastest possible, but a monster all the same.
      So basically since the compressor is so tiny, it just runs out of wind up top? EGT's aren't bad on ahu's with kkk's?

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      04-13-2012 11:40 PM #17
      k03 makes boost rapidly, so it keeps egts pretty low actually, but it is a restriction.

      What I find, is that egt goes up with a laggy turbo, k24 runs higher egt than k14 for exaple, with both maxed out.

      the ahu/k03 in the coupe would be around 475f (egt) on the highway at 60, but was running max boost or damn near

      max egt with stock tune was closer to 900f, but tdis run a lot cooler.
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      04-14-2012 12:01 PM #18
      Interesting. So an ahu/kkk can handle higher amounts of boost than stock?

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      04-14-2012 12:04 PM #19
      Quote Originally Posted by 85_305 View Post
      Interesting. So an ahu/kkk can handle higher amounts of boost than stock?
      uh, where did you get it in your head that the TINY K03 will make more boost than factory set?

      it MIGHT, but its not gonna last for crap..

      that VNT is where its at, turbo wise.

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      04-14-2012 01:05 PM #20
      I'm gonna make it work. I've got a plan for this little turbo. Just wait

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      04-14-2012 01:31 PM #21
      Quote Originally Posted by 85_305 View Post
      I'm gonna make it work. I've got a plan for this little turbo. Just wait
      if you ask too much of the K03, its gonna break the turbine shaft, and cause your engine to run away..

      i would not even attempt to tune for much more power until you get a BETTER turbo..

      please keep the VNT on the ALH tho.. the VNT will be GAY on the AHU with no way to control it..

      if your gonna do something like that, buy a K24 or T3 turbo off a 1.6TD, and strap that on..

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      04-14-2012 01:35 PM #22
      Accordsing to jeff at RC these turbos can handle stage III tuning, 18-19psi, just fine. But no I won't be putting a vnt onto the car. Too much bs and work. I'm not going crazy with this car, just a few healthy mods.

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      04-14-2012 02:59 PM #23
      Quote Originally Posted by 85_305 View Post
      Accordsing to jeff at RC these turbos can handle stage III tuning, 18-19psi, just fine. But no I won't be putting a vnt onto the car. Too much bs and work. I'm not going crazy with this car, just a few healthy mods.
      dude, ill say it again.. and put it in CAPS..

      THAT K03 IS JUST A BAD RESTRICTION ABOVE 3500 RPMs OR SO. restrictions are not good for power..

      that turbo is just too small for performance.. sure, its an insta-spooler, but it runs out of breath WAY BEFORE the engine does..

      if you run that K03 @ 18psi, it wont last long at all! promise..

      find yourself a K24/T3 and manifold, swap it on, and be done.. then it will RAIL, and you wont have to worry about your turbo exploding..

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      04-14-2012 03:48 PM #24
      Where do I find that setup? Is it a bolt-on turbo?

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