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Hello all. My Miata's VE table is kind of wierd. It's nothing like the basetunes from trubokitty or diy autotune. This is the only way I was able to actually get the car to actually idle and drive after some autotuning. Any ideas as to why it might look like this though? It's a 1993 1.6 with RX-8 yellow injectors and a garrett 2554 Flyin' Miata manifold and downpipe and ebay intercooler. I don't know whats causing it but the VE table values seem low. It has problems starting when hot but I'm pretty sure thats just because i ended up putting the IAT sensor too close to the throttle body so it gets heatsoak. I also put a log of a short drive I made in case that helps. I've done a fair bit of reading but this is the first time I actually post something tune related.Maybe I'm just overthinking it since most tables I see have higher numbers. Well, either way, some feedback would be much appreciated since this is the first time I've actually done something like this. I don't have goals for huge power, just want to make this fun car more fun. Maybe later I can get some more power but I'm doing most of this myself since I'm having financial problems at the moment
You probably won't like this answer, but it is where I would start.
They didn't make very many RX8s. There are a lot of "RX8" injectors out in the population and on the market. They have been proven to not be 550cc's, not be similar in flow from one to another, similar in dead time to one another, similar in spray pattern to one another.
Either pay to get what you have tested for flow and dead times and hope they are close enough in flow from one to another that you can actually tune the car with them once tested without blowing the engine up, or buy a set of known reputable injectors.
If you think injectors are expensive, contemplate pulling broken piston pieces out of your destroyed motor and replacing a block, head, and the Turbo that ingests all of the debris.
I'm not trying to make trouble for you, but I've been here a minute and seen a few things.
I got these injectors off an RX8 in a junkyard a while ago and got them rebuilt. I didn't check flow though. I am planning on getting flowforce 640's later down the line. For now I might just get these tested and if they're not good, I might just wait a bit. I've ready many posts about people buying and selling counterfeit RX8 injectors which is why I hopped on them when I saw one pop up at the local junk yard.
That sounds slightly low to me. The advertised deadtimes are slightly optimistic/idealistic from most manufacturers, for what it's worth.
If the req_fuel calculation is correct and the deadtime is accurate, don't worry if your table values are a little different from others. Always hand tune the idle cells for fuel and spark. Autotune the fuel cells everywhere else and extrapolate/interpolate any hard to reach cells if needed. Be aware that spark value changes will change the needed fuel values at a given point.
If you are having difficulty, particularly with idle fueling, consider adding 0.1 or 0.15 to your deadtime and retune. Manufacturers don't allow for the loss of flow volume as the injectors are beginning to open and almost closed. Think of it as counting a home faucet being as being "open" when you only have it cracked and haven't reached full opening. Same thing when it is closing.
07-29-2024, 04:10 AM
VE table is wierd.
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