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Thread: LFX (GM V6) in a Miata @ Goodwin Racing

  1. #181
    I wanna go fast! thepass's Avatar
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    Great Miatas @ MRLS event! I'm working on gettings some pics/vid together from that. In the mean time, there were a couple things that sprang up at ACS that I needed to solve, and now after running MRLS I can confirm the fixes worked so I'll cover those..

    First up, the differential fluid was exiting the vent cap on the top of the diff, leaving a very traceable mess on the underside of the rear subframe and down the side of the diff. A quick check with V8R confirmed they've seen this happen and fixed it by replacing the vent cap with a hose barb fitting and running a vent line up higher.

    Vent cap (right) is just removed with pliers. It's being replaced with the 1/4" NPT to 3/8" barb fitting on the left:



    Tapping the hole for the fitting is a treat when the diff is up in the car. I'd call changing the vent config on the getrag a must-do item so if you haven't installed your diff yet, just do this now before installing everything:



    Fitting and hose installed with a loop in the hose:



    If the vent tube mod works, we can just run the hose to the open air. But since we didn't know yet if it would work, I wanted to run the line to a reservoir to catch the fluid in the event that it was still losing any. I repurposed a Wilwood brake fluid remote reservoir for the task, with a barb fitting installed in the cap and a hole drilled in the top of the reservoir to vent pressure:



    After 3 days at MRLS, the reservoir is still dry so that's confirmed that the vent hose is working perfectly.

    The second fluid that was trying to exit the vehicle was the power steering fluid. This one was a bit trickier to diagnose but I came to the conclusion that because the reservoir cap was a vented/non-sealed design, in high-G right hand turns the fluid was being pushed against the side of the tank and effectively submerging the side of the cap, and thus exiting via the cap's vent.

    The cap needed to be sealed. I didn't take a pic of this but sealing the cap involved drilling out the spot welds that held the three pieces of the cap together, removing the vent ring, welding the two remaining pieces of the cap back together and then ordering a second cap to scavenge a second O-ring from and doubling up the O-rings under the cap to take up the height of the missing vent ring and seal to the reservoir neck.

    With the cap sealed, the tank still needs a way to vent pressure. Drilled/tapped a small 1/16 MPT hole in the upper left hand corner of the tank and ran a vent line off that, with a loop to stop fluid from passing down the line:



    Same as the diff vent line, to confirm the modifications were working as intended, I repurposed another brake fluid remote reservoir to serve as a catch can:



    Same story, 3 days at MRLS and the reservoir remained dry. Fix worked.
    Ryan Passey
    Singulär Motorsports | Goodwin Racing

    #13 1990 Miata
    "The sport dedicating to the spirits of time attacking motoring" -Emilio

  2. #182
    I wanna go fast! thepass's Avatar
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    2017 Miatas @ MRLS! The final week of prep before the event there was a lot of crunching to get things done in time. Lots of little details here and there, and finished it up with completing the color scheme on the car which included wrapping the new hood and adding details on some other panels.

    Made the pilgrimage up to Laguna Seca and had an awesome three days up there. In short, more confirmation that the car has lots of potential.. this isn't the type of event for putting down fast laps, we're mostly giving rides and making sure to play nice with all the traffic out there, but Sunday morning I did get one fun clear lap. I wasn't pushing things, just having fun chasing Jess Heitman in his V8 Prod car, waiting a month between upshifts (because we're still chasing the shifting issue) and still that lap was good for a 1:38.6. On street tires. I wasn't even thinking it would be a quick lap until I crossed the start/finish and saw it come up on the AIM.

    Pics!











    Holy tire deflection batman!



    And footage of a fun lap! The sound of that motor echoing off the pit wall going down the front straight is just rock and roll. But the best part was getting my dad in the car for a couple laps and his reaction at the end:



    I did have a sound issue over the weekend. Car hit 107db in the cool morning air XD so a track-side fix was needed. Brian had the great idea to rotate the passenger side muffler on the V-band so the outlet was pointed at the ground instead of straight at the sound booth (which is located at right side of the track between turn 6 and 7). A little Macguyver action with a coat hanger and things were adequately suspended from the mounting points. Sound check confirmed this dropped output to 101-102 db at the booth and I ran it this way the rest of the weekend:

    Last edited by thepass; 10-11-2017 at 08:34 PM.
    Ryan Passey
    Singulär Motorsports | Goodwin Racing

    #13 1990 Miata
    "The sport dedicating to the spirits of time attacking motoring" -Emilio

  3. #183
    BMW Master bawareca's Avatar
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    It is funny that yours and my motor dint have much in common, but sound absolutely identical. I will post a video confirmation soon.
    A few years ago I took my dad for a ride around a Buttonwillow, at the age of 78, and he was beyond excited.
    Red_5, Blackbird and thepass like this.

  4. #184
    I wanna go fast! thepass's Avatar
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    A couple clips friend Greg took from trackside:



    BOWERSdaAZIAN likes this.
    Ryan Passey
    Singulär Motorsports | Goodwin Racing

    #13 1990 Miata
    "The sport dedicating to the spirits of time attacking motoring" -Emilio

  5. #185
    http://www.trackhq.com/Banners/yellowsitesponsor.gif Blackbird's Avatar
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    I got to take my mom out for a ride around BRP, she was so terrified that I had to slow WAAAAY down and ended coming in after 2 laps, the faster of which was a 2:38... Lol

  6. #186
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    The car sounds great. Would love to see the car in person if I ever got the chance.

    Sucks to hear you are having issues still with slow shifts. From what it seemed like around the webs is that when it degrades it's usually a quick but progressive degradation of shifting performance.

    Best of luck on the track and keep the videos coming, love em.

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