Fourtitude.com - VR6 Gear Ratio in a MK1??? Advice needed
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    1. Member racingti's Avatar
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      84 GTI 2.0 16v
      06-24-2019 12:33 PM #1
      I am driving this car on the street occasionally and drag racing (1/8 mile) it a couple times a month. I am about to put a Peloquin LSD in and want to change the gear ratio at the same time. I know that the 3.94 is the desired R&P in the heavier MK3 for drag racing. I have the stock R&P 3.389 and can get rubber in 2nd and 3rd when at the drag strip on street tires at 24 psi. Is the 3.94 R&P the best option is a light car? Some people complain of wheel spin city with the 3.94 and 200+ hp. Other people love that gearing with the diesel 5th gear. My goal is to continue to lower my 1/8 mile times, while still drive-able on the street.


      Car: 1984 GTI with a VR6 12v OBD2 and 02A with stock R&P 3.389 on 195/50r15 tires

      Current Mods: Open Filter Intake, Eurowise SS Header, 2.5 exhaust w/ Magnaflow & no cat, TT Chip, Lightened Flywheel 12 lbs

      Future Mods: Eurosport lightened underdrive pulley, Real 2.9 Intake, 1.8T IAT mod, MK4 head gasket, P&P head, 268 TT cams, wrap header, LSD Peloquin, 1.429 for 3rd gear, .75 for 5th


      Would the 3.68 R&P be better for a lighter car? or 3.65 or 3.94?

      Thank you for opinions.
      Last edited by racingti; 06-24-2019 at 03:34 PM.

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    3. Member GTIVRon's Avatar
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      92 Corrado SLC, '12 Golf R
      06-24-2019 03:15 PM #2
      3.94 is a bit annoying for street driving my car... but it does feel great. With all the bolt-ons, cam, and a gutted car, traction in 1st is difficult on summer street tires. 2nd spins hard on quick shifts but won't let go in a straight line... My concerns are coming to HPDEing the car. I have a .717 5th gear, I think I'll run out of revs in 4th but I'll be out of power going into 5th. My advice would be to use a gear calculator (google search yields plenty of them and the info needed can be found from the vwtransaxles website) and decide what you can deal with on the street, unless the strip is more your line.

      In my position, if I got a re-do, I'd do third like you're planning, .717 5th, and 3.64 final. The shift from 4-5 will still feel like 4-6.5, but at that point 4th would give all the speed I'd manage and have an actual reduction for a highway gear. Now that's for street>HPDE>drag setup. If you're building more for drag, I'd recommend the 3.94 all day.
      2002.5 Jetta 1.8T - TOTALED (dodging deer)
      2002.5 24v GTI - TOTALED (rear-ended by a Jeep)
      1992 Corrado SLC - Daily Driven (when it's not broken)
      2012 Golf R - Daily Driven (when Corrado's broken)

    4. Member racingti's Avatar
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      84 GTI 2.0 16v
      07-01-2019 11:31 AM #3
      I was looking at the gearing more closely. I had another idea that may be the half way between the 3.68 and the 3.94. Let me know if this sounds reasonable. Change out the R&P on a CES and leave the gears stock.

      Would be the following gearing.
      R&P: 3.389 1st: 3.778 2nd: 2.118 3rd: 1.429 4th: 1.029 5th: 0.837

      By my calculations it be more aggressive then a CCM w/3.68 but less aggressive then a CCM w/3.94. I have not read anyone trying this combination it usually just changing the R&P on CCM.

      This may be a good combination for a NA VR6 MK1.

      Thoughts/opinions? Would this be good for the street and drag racing?

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    6. Member GTIVRon's Avatar
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      92 Corrado SLC, '12 Golf R
      07-01-2019 01:43 PM #4
      I think the ratios would be fine, but final too long to realize the benefit. I'd stick with the 3.64 and do a longer 5th gear as a cruiser. Or "do it right" and add a .717 for 6th. But that's purely for the "street" sense. For a track day star, I think what you've got picked out would be fun (still with shorter final).
      2002.5 Jetta 1.8T - TOTALED (dodging deer)
      2002.5 24v GTI - TOTALED (rear-ended by a Jeep)
      1992 Corrado SLC - Daily Driven (when it's not broken)
      2012 Golf R - Daily Driven (when Corrado's broken)

    7. Member lilgreenmk3's Avatar
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      mk2 16v/ b3 vr6/ mk3 2.go/ 73 ragtop squareback /mk3 vr6
      07-08-2019 12:27 PM #5
      the 3.94 is perfect for track and street if you wanna have that power put down immediately, the 3.38 is too long for the 1/8th trust me i ran it for 3 years on the 1/8th .. the only prob i have with the 3.94 is that they're hard to come by. I personally will be going with the 4.24 02j only because I race 1/8th mile at my home track so i'll need the quick pulls now on the street it may be a bit short but eh race car right lol
      as long as you toss a tall 5th you should be fine

      if youre on slicks NOT radials but slicks the 3.94 will hook and go same with the 4.24. it all makes for a hell of a fun time once youre outta the 3.38

    8. Member racingti's Avatar
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      84 GTI 2.0 16v
      08-10-2019 09:43 AM #6
      Thanks guys for all the input. I am between the 3.684 or pulling a R&P out of a early 02J for the 3.938. I plan on running on the street and the strip, so mainly summer radials, but I do have some soft autocross tires (less than 200 wear) that I plan to utilize when I get them mounted all 195/50r15 size. I limited on tire size because of the MK1 fender size.

      Effective gear ratio with my tire size:

      R&P Effective
      3.389 = 3.44
      3.684 = 3.75
      3.938 = 4.01

      I hear what y'all saying that you can rip out of the hole with the 3.94, but is traction going to be an issue with that effective gear ratio on summer tires and a light MK1?

      My Goals:

      TO BEAT lightly modded V8 Challengers, Chargers and Mustangs, without a turbo or spray.

      My Fears:

      3.94 - I want to be quick off the line, but I don't want to have ridiculous trouble with traction so I can't utilize the power effectively. Regret that I geared it to low to utilize the power.
      That is my fear with the 3.94.
      3.68 - Regret that I went with the 3.68 because I can't tell enough difference compared to the 3.38 to make the work & money worth it. Regret that I geared it to high to use the That is my fear with the 3.68.

      Paralysis by Analysis.

      I am currently running a 9.48 sec 1/8 mile. I would like to be in the low 8's if possible or faster (I realize that there is a ceiling with my NA 2.8 aspirations). I just hate losing to the pretty boy Dodge guys. LOL

      Thoughts?

    9. Member
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      1998 Jetta VR6 (bone stock daily driver), 1982 twin screw Cabriolet, 94 Mazda B3000 4x4
      08-14-2019 05:43 AM #7
      For what its worth i ran an FN (wide ratio 020) with peloquin in my twin screw Cabby... but that was with a flat 200 wtq from 2k rpm all the way to 5.5k. VR6 though is "soft" below 3.5k so might not be the best (unless you upgraded to the variable plenum setup). FN had wide gears but 3.89 RP.

      i liked the FN because it spreads the torque out more, and i could get to 60 in 2nd. Of course the .71 overdrive gear for good economy... but this was a street car.

      The 0-4 gearing on the FN seems close to that on my Jetta GLX VR6... but RP is lower on my O2A. i wish 5th on my O2A was like the 5th on my Mk1.

      Quote Originally Posted by racingti View Post
      Thanks guys for all the input. I am between the 3.684 or pulling a R&P out of a early 02J for the 3.938. I plan on running on the street and the strip, so mainly summer radials, but I do have some soft autocross tires (less than 200 wear) that I plan to utilize when I get them mounted all 195/50r15 size. I limited on tire size because of the MK1 fender size.

      Effective gear ratio with my tire size:

      R&P Effective
      3.389 = 3.44
      3.684 = 3.75
      3.938 = 4.01

      I hear what y'all saying that you can rip out of the hole with the 3.94, but is traction going to be an issue with that effective gear ratio on summer tires and a light MK1?

      My Goals:

      TO BEAT lightly modded V8 Challengers, Chargers and Mustangs, without a turbo or spray.

      My Fears:

      3.94 - I want to be quick off the line, but I don't want to have ridiculous trouble with traction so I can't utilize the power effectively. Regret that I geared it to low to utilize the power.
      That is my fear with the 3.94.
      3.68 - Regret that I went with the 3.68 because I can't tell enough difference compared to the 3.38 to make the work & money worth it. Regret that I geared it to high to use the That is my fear with the 3.68.

      Paralysis by Analysis.

      I am currently running a 9.48 sec 1/8 mile. I would like to be in the low 8's if possible or faster (I realize that there is a ceiling with my NA 2.8 aspirations). I just hate losing to the pretty boy Dodge guys. LOL

      Thoughts?
      Last edited by Peter Tong; 08-14-2019 at 05:46 AM.

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