ckurtz2

@jonbill Of course, that's the goal. I left links in the document to read both (I will move one to the top so it is easier to find), as they are very different, both hardware and firmware. In addition, the STM Pro is by no means a standard Speeduino. It uses a completely different microcontroller (STM32) instead of the typical Arduino or other similar microcontrollers. The components on the board are also quite different. They only share the same firmware and software. Users will definitely need to do their own research on respective ECUs as their manuals are typically dozens of pages. I am not going to explain something in detail worse than what has already been written, thus why that section is severely oversimplified.

Hey guys, Been a while since I have been on the forum. Anyways my engine is cammed, and ever since the stock Bosch Jetronic fuel injection system had problems running the cam. Cold starts were near impossible, and mid-range throttle was never happy. I messed with it for well over a year but made the decision to go a different route. I decided to switch over to a new ECU and engine management setup. I chose the STM PRO because almost no material was out there on how to do it, and I find it to be a very capable ECU for sequential fuel injection. If anyone is considering swapping over to an aftermarket ECU, I highly encourage it. It seems super daunting at first to try and figure it out, but if you read lots of material, the fundamentals become very easy to understand, especially how different sensors and such are wired. Anyway, I provided a manual on how to put the STM PRO in your Datsun 280z. It is pretty comprehensive, but it is almost impossible to cover everything. It also references many links that you may find useful. I did make a wiring diagram, which I don't believe exists anywhere else for the STM PRO. It is specific to my setup, but you can tweak it however you need. Hope this finds someone to be of use for! The manual is listed as an attachment. PS. Special shout out to Pro TunerZ for setting me up with the STM Pro and all the other items that I bought. Everything was very high quality and I was very impressed. 280z STM Pro Conversion Manual (FINAL).pdf

Or could email ckurtz2@asu.edu

@Zed Head it would be amazing if you could reach out for me, thank you. Honestly, just drop him my number (602)-558-5458 to text or call Clayton.

@Zed Head You likely just saved the day. I can't thank you enough. Beats ebay vendors any day, I don't think MegaZip will find the gears, and the plus is he is located in Arizona. Waiting for my hybridZ account to be verified.

@Zed Head thank you. For some reason, none of those forums came up when I was researching earlier. Sounds like that is what will need to be done. I found a website that said it had the new gears in stock (megazip) although I don't necessarily believe them. I reached out nonetheless. If it doesn't work out then I'll have to chance it with some used gears. Thank you!

@inline6 no they did not. I was very frustrated with it and talked with the owner. Honestly, doing that was my plan B, so its not a huge issue if I can find the proper gears for plan A. @Zed Head I have come to that conclusion too. I have found several 3.7 R200 open diffs online. The problem is that some ring gear bolts in the 300zx had 12mm bolts, and some had 10mm. I need the 12mm. I can't come to any conclusion online as to which year and trim had the 12mm ones. Unfortunately, all of the eBay differentials are sealed, so they can't check for me either.

Shop fixed the differential. The pinion bearings failed as suspected. Shop told me gears were unfortunately toast too (something about overheating, as well as too worn). So they put new bearings/seals/ring and pinion in and repainted the housing. Does anyone have a 3.7 or 3.9 differential they are willing to part with? Unfortunately, they couldn't find the correct gear set and installed the regular 3.545 ratio. They said if I find the proper set they would replace it for free though. I really would like the 3.7 or 3.9 ratio, as that was my bread and butter behind the differential. Please let me know, maybe a deal could be made.

Does anyone have experience just using the old dizzy shaft as both the cam and crank angle sensor? I know you said it is less accurate, but at that point is it just apples and oranges? Will it really affect much? Something like this seems really easy https://www.godzillaraceworks.com/ignition/grwcaskit

@duffymahoney Did you have to use high-impendence injectors for your setup? I am reading online that for fully sequential the injectors need to be high impendence. For batch fired, that isn't needed apparently. Any ideas? I am eventually going to price out the cost of going fully sequential injection and COP, or batch fire and wasted spark. I guess could I do the sequential injection and then wasted spark? Wouldn't see the point I guess.

@duffymahoney That helped me understand things so much better, led me off on a trail or more research, thank you. My biggest question is how does the 280zxet dizzy act as both a crank angle sensor and cam angle sensor. Because it does this, it may be simpler to just do this than to get a crank angle sensor on the harmonic balancer and then a cam angle sensor where the dizzy used to be. However, both options look very simple. I was wondering which Jeep cam angle sensor you used? I can't find a part number for it on other forums. Looks like a solid setup to be honest. How smoothly does ur fully sequential motor run? I think the mega squirt platform can handle wasted spark but I would have to look further into it. I think fully sequential would be kind of fun to do, and definitely more modern than doing batch fire and wasted spark setup. I know lots of cars use the wasted spark and batch fire just fine though. Wondering how many years this mega squirt system would last if done properly. I don't want to deal with any of the pain the OEM injection has put me through with constant maintenance and tuning/fixing.

@dutchzcarguy @Patcon . I am very new in teaching myself how DIY fuel injection works, let alone the ignition system. I think you have convinced me to go coil on plug, and sequential injection though. I think the modern approach definitely is the approach, I just don't understand how to do COP without the 280zxet dizzy. Would something like this work?https://protunerz.com/collections/sensors/products/onesix-industries-l-series-crank-sensor-hall-billet-new From my understanding to do sequential injection you need something that can measure cam and crank position, and CAS is the way to do the crank? I think this little dingy is just a distributorless CAS. But then what measures the cam? Trying to get educated. The more I learn the easier and more complex it gets at the same time. @duffymahoney I pulled up the sight. How do I navigate it haha. I am not versed in Japanese lol.

@Terrapin Z I saw some on ebay for like $1000 dollars which is rediculous. I agree even $350 seems steep, especially because that one doesnt look to be in the best condition. Going to check it out now. Thank you!

View Advert 280zx Turbo Distributor Looking to convert my car to megasquirt. Requires the 280zx turbo distributor or equivelent, so that is what I am looking for! Advertiser ckurtz2 Date 02/06/2024 Price Category Parts Wanted Year 1981 Model 280zxturbo

Amazing description @inline6. Makes absolute sense to me, I bet you nailed it right on the money then. Everything carrier/ring gear side looked super solid to me, I couldn't even find a micro scratch scratch on any of the bearing surfaces. Yes, definitely an oil starvation issue. Hopefully the few miles I had to drive with no backlash and loud wine didn't ruin my gears! @AK260 I agree! I kinda am sad I am not doing this job by myself, but I could use the time saved. I will be checking the gear contact pattern myself though before sealing the cover, so as not to get jipped by another shop:).