midnightzxt Posted October 5, 2007 Share Posted October 5, 2007 I think it's because of the HEI module overheating, but it confused me. See the attached picture. Where can I mount the HEI module so that it stops overheating?? THis is like the 4th one. Quote Link to comment Share on other sites More sharing options...
Paul260z Posted October 5, 2007 Share Posted October 5, 2007 Have you thought about just using the VR or the Hall option with megasquirt. I had a problem with the HEI module so thats the way I went and no more problems. Quote Link to comment Share on other sites More sharing options...
mario_82_ZXT Posted October 5, 2007 Share Posted October 5, 2007 What are your spark settings? My car has the HEI mounted on a heatsink. My friend's 280z has it on a piece of 1/8 aluminum then mounted to the chassis. Neither of us have had problems with it overheating. Good to see you back on the board! Your ZXT is still one of the best ones out there! Mario Quote Link to comment Share on other sites More sharing options...
proxlamus© Posted October 5, 2007 Share Posted October 5, 2007 i too mounted a heatsync on the back of the HEI.. per Moby's instructions =) Quote Link to comment Share on other sites More sharing options...
midnightzxt Posted October 5, 2007 Author Share Posted October 5, 2007 Thanks Mario I have it mounted on that heat sink white glue looking stuff. I think my problem is more of where it is mounted. When I first installed the MS and was drinking more alcohol then I do today, I mounted the HEI on the stock tower RIGHT next to the turbo... and I lost my stock metal heat shield about 6 years ago. BTW... does anyone have a spare heat shield I could buy? Anyways, in what location is the best spot to locate the HEI where the engine bay produces the least amount of heat? I'm also going to ground it with 10-12 guage wire directly to negative battery ground. If that doesn't work, then I'm going to look in to changing the spark system I'm using. What are your spark settings? Can you post a list of the settings you're looking for? Quote Link to comment Share on other sites More sharing options...
mario_82_ZXT Posted October 5, 2007 Share Posted October 5, 2007 I'm talking about the general settings and the dwell settings, which should be under the spark settings drop down. On all my installs (including my dad's fresh 280zT), I've put the HEI module near the coil and close to the headlight bucket. I don't think the buckets are completely sealed so I'm pretty sure there's some airflow there... And aren't HEI modules originally cooled by the rotor in the distributor? I think you really ought to move it. Also I'll look for the heatshield as I'm pretty sure I have one in my turbo parts car. Mario Quote Link to comment Share on other sites More sharing options...
olie05 Posted October 5, 2007 Share Posted October 5, 2007 I have had no problems with my VB921 coil driver. I originally had an HEI and I went through one of them just trying to start my engine. It just seems like the vb921 is less likely to overheat than the gm hei. Also, the install is a little more stealthy, since all the wires going to the coils stay stock. Quote Link to comment Share on other sites More sharing options...
midnightzxt Posted October 5, 2007 Author Share Posted October 5, 2007 Also, the install is a little more stealthy, since all the wires going to the coils stay stock. Those wires are soo far gone haha. what is the vb? Quote Link to comment Share on other sites More sharing options...
midnightzxt Posted October 5, 2007 Author Share Posted October 5, 2007 I'm talking about the general settings and the dwell settings, which should be under the spark settings drop down. Trigger angle is 60, no addition. Time based, 10 cranking angle, 1 hold ignition, no invert, -10 fixed angle spark map is extremely similar to Moby's Dwell control: cranking 6.0, running 4.0, minimum discharge .5 Quote Link to comment Share on other sites More sharing options...
mobythevan Posted October 5, 2007 Share Posted October 5, 2007 Hmmmmm.... I thought you were suppose to use Fixed dwell and "minimum for HEI4". Quote Link to comment Share on other sites More sharing options...
e_racer1999 Posted October 5, 2007 Share Posted October 5, 2007 you could always attach a heatsink to a peltier then attach that to the module.... Quote Link to comment Share on other sites More sharing options...
mario_82_ZXT Posted October 5, 2007 Share Posted October 5, 2007 Hmmmmm.... I thought you were suppose to use Fixed dwell and "minimum for HEI4". I think his firmware is too old for that. Minimum for HEI4 is different, and makes the tach go crazy. It should actually be non-inverted at a 75% fixed duty cycle. My doesn't even warm up with these settings. Maybe upgrade the firmware? And definitely move the HEI module. The VB921 is from a newer MS version hardware (v3). Mario Quote Link to comment Share on other sites More sharing options...
olie05 Posted October 6, 2007 Share Posted October 6, 2007 I think his firmware is too old for that. Minimum for HEI4 is different, and makes the tach go crazy. It should actually be non-inverted at a 75% fixed duty cycle. My doesn't even warm up with these settings. Maybe upgrade the firmware? And definitely move the HEI module. The VB921 is from a newer MS version hardware (v3). Mario I'm running the vb921 in my v2.2 board. it took a whole 20min to solder in. I just used the hole for the led i'm triggering off of as the mounting point for the vb921. Quote Link to comment Share on other sites More sharing options...
midnightzxt Posted October 9, 2007 Author Share Posted October 9, 2007 I think his firmware is too old for that. Minimum for HEI4 is different, and makes the tach go crazy. It should actually be non-inverted at a 75% fixed duty cycle. My doesn't even warm up with these settings. Maybe upgrade the firmware? And definitely move the HEI module. The VB921 is from a newer MS version hardware (v3). Mario I upgraded the firmware about two days before the spark problem.. 29y4 or something like that. I'm going to work on moving the HEI, and maybe even throw in a cooling tube from the fender? Quote Link to comment Share on other sites More sharing options...
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