Enjoying a rainy weekend here so I got a few more ‘to-dos’ checked off the task list. First on the list was installing the carbon fiber engine cover to make the engine bay look ‘pretty’. Since my old breather/oil fill cap would not fit/work with this cover I opted to install a remote breather tank for any oil fumes/vapors that get emitted through the breather otherwise.  This was something I’ve been wanting to do as the oil vapors and junk collect on the rear glass…and I wouldn’t want that stuff all over the new engine cover. The breather tank was mounted in the driver rear wheel well (lots of space back there to work with), and connected it to a screw in AN adaptor that fits the LS valve cover oil fill neck.  The engine cover then installs by sliding down over 4 set screws that I installed in lieu of the fuel rail bolts used previously. I just need to have some badges/emblems made to fill out the inserts now.

The trans oil puke tank was another issue I’ve been looking to correcting. The trans likes to spew oil in considerable amounts into the puke tank that I had installed previously, as it seems that the breather was mounted right over 5th gear. I acquired a new tank and mounted it high in the passenger rear wheel well so that any overflow from the trans should hopefully drain back down into the trans rather than just collecting in the tank. Time will tell on how well this current attempt works.

Since I’ve had the GTM on the road (some 330 miles now) I have had a problem with it randomly popping out of reverse or first gear when starting from a stop, usually only when the box was cold. No grinding, just pops out, as if it wasn’t fully engaged. If I firmly put it back in gear it would then start moving fine. I figured either the cable that controls the fore/aft motion (that allows you to enter the various gears) was not calibrated properly, or my trans was injured.

I contacted Brandwood this week and they promptly replied with instructions as to how you should properly calibrate the cable-shift’s fore/aft range of motion. The directions I received with my cable-shift system were very general and really did not discuss this calibration at all, so I simply ran the cable and connected it and tightened up the jam nuts that hold it on place. With proper instructions in hand I could see that my cable was ‘calibrated’ in such a way that it had plenty of range for 2-4 shifts, but it was about a 1/2″ short of pulling the shift rod out of the transmission all the way on the R-1-3-5 shifts. No wonder I was having problems! With the proper calibration performed, I took the GTM out for a while and had zero issues. Nice!

Here is how to properly calibrate your Brandwood Cable-Shift system for proper fore/aft motion to ensure proper gear engagement:
1. Disconnect the fore/aft cable from the shift rod ‘coupler’ at the ‘ball and socket’
2. Push the transaxle shift rod forward, into the transaxle
3. Pull the shifter handle down, as if you were selecting 2nd or 4th gear.
4. Check that the ‘ball and socket’ connector moves past the shift rod ‘ball stud’
5. Pull the transaxle shift rod out, away from the transmission
6. Push the shifter handle forward, as if you were selecting 1st gear.
7. Check that the ‘ball and socket’ connector  again moves past the ‘ball stud’ on the shift rod. You should see  a slightly greater range of motion from the ”ball and socket’ connector in each direction than the ‘ball stud’ on the shift rod. This ensures that the cable is pushing/pulling the shift rod into/out of the transaxle all the way.
8. If the range of motion is lacking in the ‘1st gear’ direction (ie: when you pull the shift rod out), ‘tighten’ the rearward jam nut . If the motion is lacking when going to grab 2nd or 4th, tighten the ‘forward’ jam nut (the one that is closest to the  motor).
9. Once the range of motion is calibrated properly, put the shift rod in neutral, and the shifter handle in neutral. The ‘ball and socket’ connector should be able to slide over the ‘ball stud’ connector.

Here is a pic of how my calibration ended up looking.

After each of my several longer drives in the GTM (20 min+) I noticed something that should not be happening – after 20 or so minutes of driving it became really difficult to shift the transmission into gear. I can only describe the feeling as ‘sticky’ or ‘sludgy’, as it would still shift fine, but it took considerable effort to move the shifter up and down into gears.

My first thought was it was because I did not have the trans oil cooler running. My second thought was that the clutch stopper was potentially stopping the pedal too soon and the clutch was never fully deactivating when shifting and when it heated up it was creating friction, and thus the sticky shifting. I activated the cooler pump, moved the clutch stopper back some more, and hit the road. Same problem after extended driving.

After numerous replies on the GTM forum I turned my attention to the thicker of the two shifter cables that run from the Brandwood shifter box to the trans shift rod. This cable controls the fore and aft motion of the shifting (ie: going into gear), and it also runs very close to the exhaust. The responses I received pointed to a potential overheating issue with the cable, causing the shifting issue. I ordered an Earl’s Flame Guard insulation sleeve for the cable, but in the mean time I used some extra 3/4″ corrugated high-temp resistant wire loom to wrap the shifter cable. I took the car out for the longest drive to date and when I pulled back in the garage the shifting was as smooth as it was when I first started the car. Problem solved 🙂

With the shifting issue taken care of, I set to reinstalling the cold-air intake. To create a buffer between the exhaust and the intake sleeves I actually just loosened the exhaust collars and rotated them so the bolts that run through the collars would support the intake. I then stuck some Thermotec heat barrier to the bottom of the sleeves where they rest on the collar bolts. I took an extended drive with this configuration and it worked great. Intake air temps dropped from 140+ degrees at speed when previous drives were logged, to 75 degrees. HUGE difference. Leaving the car at idle for several minutes after the 30+ minute drive had the IAT’s sitting at around 100 degrees. Previously the IAT’s would see 150+ degrees while idling. The CAI is pure win.

The Kooks exhaust is finally centered. An inch of piping had to be cut off the driver’s side cat pipe to get it to center properly. We are still working on mounts for the exhaust. The Kooks system comes with a set of mounts that are meant to connect to the trans (you create a bracket for them), but they fasten around the nice polished mufflers, and I’m not a fan of that.

The transmission overflow tank was completed with the fitment of the barb connector into the transmission case, and then connecting it to the tank.

I recently revised my CAI design again and moved on to ‘version 3’. This version eliminates the bends as the piping goes towards the side ducts. Instead, I purchased 2 45-degree silicone sleeves and ran straight pipes with the intake filters on them to sit directly behind the side ducts. Very nice clean look. I will install some hangers to help support the ends of the straight pipes as well, and probably fab a heat shield to sit between the exhaust and intake.

Painted the remaining mesh inserts (front/rear small ducts, and hood ‘mouth’) black. They are ready for install.

I noticed when driving the go-kart that the trans was spewing oil from the breather cap on the top of the trans. Not a lot, but enough to make me want to do something about it. The solution is an overflow tank that will catch any leaked oil. The tank has a petcock  that allows me drain the oil when needed.  To complete this setup I need to install a hose attachment in place of the breather cap, and run a short hose to connect the tank to the trans.

Wired the oil pump up tonight. A keyed power source runs to the inline oil temperature sensor on the cooler inlet, which activates a relay that turns on the oil pump on when the sensor hits 180 degrees. The relay also grounds an oil pressure sensor that will trigger a dash-mounted led that will turn on when the pump reaches 15+psi.