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    Thread: How to build a relatively inexpensive, reliable, powerful Vr6.

    1. Member sk8too's Avatar
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      97 Jetta VR swapped. 2010 CC VR Executive bagged uni tune. 2012 Passat SEL
      05-05-2012 11:14 PM #501
      Just loosen the bolts that hold the drier push the tube into the hole and then snug it back up.
      97 Jetta GL, OBDI VR swapped, 262 cams, GIAC chip, turn 2 style CAI, Magnaflow catback, 2.9 clone manifold, eurospec flywheel, B&G RS2 coilovers, MKIV front and rear seats

    2. Member 98GTI_VR6's Avatar
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      1998 VW GTI VR6
      05-06-2012 06:20 PM #502
      Thanks ill try the above recommendations... Btw I have him in a quarter he comes around me in the big end we did a pull from 50-110 n that's where he beat me but my jump at the line destroys him. I really want that ytrtansmission that mjm offers with the 3.98 r+p and the upgraded diferential

    3. Member 2a2gtis's Avatar
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      MKII gti 8v (driver) MKII gti w/rado vr, B4 Passat VR Ducati ST2
      05-07-2012 06:31 PM #503
      Ive got the motor out to do timing chains and some other stuff.
      On page 1 its written " Timing is always the last thing i do before starting an engine. If you time it, and let it sit, it can very easily hop a tooth on one cam overnight."
      I want to avoid the possibility of this. Could I? ....
      Time engine, install it into the chassis. Reconnect everything except, leave the tensioner (bled and submerged) in oil until I'm ready to start the engine.
      Thread in the tensioner and start it up?
      This would be easier- time wise, for me- I'm thinking I should be fine. Ive never done this before. So I thought I'd ask

    4. Geriatric Member need_a_VR6's Avatar
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      05-07-2012 06:45 PM #504
      With all the motors I have assembled this has never been an issue. Be sure to use the later spring loaded tensioner bolt on all builds with late model all plastic rear guides.
      -Paul
      1995 GTI VR6 - Retired - 12.90@106 R32 power - 12.833@106 12v power
      KPTuned - Official MegaSquirt: Sales - Repair - Installation - Tuning
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    5. Member GT-Ian's Avatar
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      05-11-2012 08:56 AM #505
      great thread, there is a lot of helpful info

      Thanks Ian
      98 JETTA VR6/92 GTI VR6 <---Both were missed, until I bought this---> 08 R32

    6. Banned Hurt's Avatar
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      1998 Jetta GT, 1998 GTI 2.0, 2012 GLI, 2012 GTI
      06-08-2012 08:16 PM #506
      This thread is so helpful.

    7. Member vwhead5223's Avatar
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      02 GLI 24V Jetta,90 G60 Corrado,00 VW Cabrio VR6 swap,02 Xterra Supercharged (VW recovery Vehicle)
      06-10-2012 09:43 AM #507
      I have just spent the last two days....at work reading this thread from front to back. Great thread. Love the idea of the 1.8t iat sensor every little bit counts.

      I am curious about a statement that you made in your first post. You stated that headers give no gains. That just seems odd to me. I am currently freshening up a VR for a swap I am doing. I cam across a header for a few bucks. Is it better to just run the stock mani and head (no head machining or mani machining) or run the header?


      Thanks in advance.

    8. Moderator root beer's Avatar
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      06-10-2012 10:10 AM #508
      It does seem odd, doesn't it? For one thing, most of these headers are just poorly thought out, poorly made ebay junk. Another is that these motors don't rev very high, which is usually where a header really shines on most cars.

      Headers are lighter than the stock stuff on the positive end.

      Try it, and see what you think. It's nothing that you can't change back later.

    9. 06-10-2012 10:51 AM #509
      I have been reading this thread for over a year now. I have slowly done alot of whats in this thread thanks to Root beer and his suggestions. Got it dyno'd yesterday at 175whp./168ft lb and i am very happy with those numbers.

      Awesome thread
      98' GTI VR6 All Motor 13.44 at 105MPH

    10. Member Grabbit's Avatar
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      06-10-2012 02:40 PM #510

    11. Moderator root beer's Avatar
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      06-10-2012 02:43 PM #511
      That sounds about right. Depends on what parts your man will need to get for you. I've sent heads in that need damn near all the valves.

      Thanks for all the positive comments guys

    12. Member Grabbit's Avatar
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      06-10-2012 11:46 PM #512
      I've been experimenting with the whole 1.8t IAT sensor and I have to say that I've gotten mixed results with the sensor in the intake track of a CAI and not in the intake track of a stock airbox. Seems to run better on the OEM IAT in the manifold then these two scenarios. Next step in modifying the manifold to put the 1.8t sensor on the stock location. I'm not sure but the 1.8t was engineered with the sensor after the TB so I have to think this is the best place for it.

      Just my .02, anyone else?

    13. 06-11-2012 02:11 AM #513
      I just went to a potentiometer instead of the temp sensor after cleaning up my harness this time.

      Logged with Vagcom, and kept decreasing the value til it started pulling timing/registering knock (which it never did, on 93oct, Early C2 Jeff tune) so mines locked at something super low temp wise, as I went til it stopped decreasing the IAT on the scanner, then went up 2 degrees so it wouldn't throw a code for too low IAT reading. No knock issues even in the recent 90*+ weather.



      If I remember next time I'm out messing around, I'll log the timing on different temp settings to get an idea of the timing changes occurring.


      Honestly though, if you are experiencing a big enough driveability/power difference(especially negative!) by swapping to a 1.8t IAT in the intake tube, you have a different underlying issue, as the change isn't really "buttdyno" significant.


      I'd start by logging timing(both actual and from map), knock counts, & IAT on a 3rd gear pull with both setups and see whats going on.

    14. Geriatric Member need_a_VR6's Avatar
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      06-11-2012 07:13 AM #514
      Dont forget the iat effects the fuel calcs too. Not a big deal until the temp changes and your fuel trims are way off.
      -Paul
      1995 GTI VR6 - Retired - 12.90@106 R32 power - 12.833@106 12v power
      KPTuned - Official MegaSquirt: Sales - Repair - Installation - Tuning
      MK3 Race Car Partout

    15. 06-11-2012 01:20 PM #515
      Quote Originally Posted by need_a_VR6 View Post
      Dont forget the iat effects the fuel calcs too. Not a big deal until the temp changes and your fuel trims are way off.
      I'm getting some detonation and pinging on GIAC 268 software once the car is warm. Even with the 94 octane (10% ethanol) that we have up here in Canada.

      I am going to retorque my knock sensors but would it be possible that a 1.8T IAT may help my situation? It has happened even on my old stock motor in the exact same circumstances with this motor. Could never figure it out.

    16. 06-11-2012 02:00 PM #516
      Quote Originally Posted by WannabeVWguy View Post
      I am going to retorque my knock sensors but would it be possible that a 1.8T IAT may help my situation? It has happened even on my old stock motor in the exact same circumstances with this motor. Could never figure it out.
      if anything doing this sensor mod will make it worse as it adds timing
      98' GTI VR6 All Motor 13.44 at 105MPH

    17. 06-11-2012 02:58 PM #517
      Fuel trim is also a factor. Not just timing. As paul mentioned this sensor has an effect on fuel trim so i am just curious if its worth a shot

    18. 06-11-2012 03:59 PM #518
      Quote Originally Posted by need_a_VR6 View Post
      Dont forget the iat effects the fuel calcs too. Not a big deal until the temp changes and your fuel trims are way off.
      Do you happen to have/know what the stock table for it looks like? Like whether they are 2d: IAT/fuel modifier & IAT/Timing modifier, 3d based off load, or something not even close to either. Or know how the ECU calculates it. I figure if anyone knows, that will actually share, you'd be the guy.



      I guess I could just not be lazy, and open up the OBD1 .bin and see what it looks like.

    19. Member Grabbit's Avatar
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      06-11-2012 04:02 PM #519
      Quote Originally Posted by JohnStamos View Post
      the change isn't really "buttdyno" significant.

      more of a cold start/idle issue. As far as power, I can't tell the difference other than the cheap ebay CAI i got is worse than a OEM paper filtered rado airbox..... Plus it makes the car sound like a single cam vtec motor with an intake

    20. Member veersixxx's Avatar
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      06-26-2012 12:50 PM #520
      Hints & Tips





      My '97 did 185 whp/ 183 wtq on a dynojet. But it needs a real tune and some diag i am sure. Eats more oil than bp can spill.

    21. Member 2a2gtis's Avatar
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      MKII gti 8v (driver) MKII gti w/rado vr, B4 Passat VR Ducati ST2
      06-28-2012 06:40 PM #521
      I ran a 14.6368 @ 93.84 2.1934 60' 95 degrees that day (last weds.)
      best mpg is 33 mpg around town. About the same on the freeway (ccm trans)
      Now I'm no drag racer. I just had to know what it would do. What would 268's and a p&p do with those numbers?
      My friends are big drag racers and they said expect 2 to 3 tenths when the temp goes below 60 degrees.
      I guess I'm looking for 13's. Im at 2360lbs with me in it (mk2)
      I basically did everything here in this thread except the trans work and what I said above. (stock head for now)
      Thanks for the help roostbeer
      Also to everyone else that has contributed on this thread
      Last edited by 2a2gtis; 06-28-2012 at 06:43 PM.

    22. 06-28-2012 06:49 PM #522
      Honestly, after your compression numbers, and trap speed, I'd be looking to rering it before dropping money on anything else.

      For comparison, I have trapped 94mph, at 2900lbs with me in it, CCM trans, with just exhaust and tune.

    23. 06-28-2012 10:46 PM #523
      Quote Originally Posted by veersixxx View Post
      Hints & Tips





      My '97 did 185 whp/ 183 wtq on a dynojet. But it needs a real tune and some diag i am sure. Eats more oil than bp can spill.
      That is the exact same tranny setup i run and its perfect
      98' GTI VR6 All Motor 13.44 at 105MPH

    24. Member 2a2gtis's Avatar
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      06-29-2012 04:29 AM #524
      Quote Originally Posted by JohnStamos View Post
      Honestly, after your compression numbers, and trap speed, I'd be looking to rering it before dropping money on anything else.

      For comparison, I have trapped 94mph, at 2900lbs with me in it, CCM trans, with just exhaust and tune.
      2900 wow. Hmm. I did the mkiv HG. But have not redone the comp test. Yeah sounds like some time could be made up if it was just tight. Lifes busy now. I'm just happy to be up and running. Ill try to make time. A new test would be interesting. Its easy enough to.

    25. Geriatric Member need_a_VR6's Avatar
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      06-29-2012 04:51 AM #525
      At that weight something is wrong. I would check comp and if that's fine, cam timing.
      -Paul
      1995 GTI VR6 - Retired - 12.90@106 R32 power - 12.833@106 12v power
      KPTuned - Official MegaSquirt: Sales - Repair - Installation - Tuning
      MK3 Race Car Partout

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