Stock ECU Remapping....
Has anyone ever messed around with this rather than buying a Pettit ecu? I have a guy in town that can apparently tune stock ecu's. He has a chassis dyno in house and modifies GM's and Fords but I don't know if I trust him with my baby.
I was also told that this guy(with the help of Adam @ Rx-7 Specialties) was able to get 40 hp out of an Rx-8, just by tuning the ECU. I was planning on getting a PFC but I could use this to buy me some time and keep my car running healthy. Is it worth the shot or should I stay away? How much power can the stock ECU be capable of handling? Thanks for any answers. |
Once you get to the point where the stock injectors can't handle the fuel delivery load (generally acknowledged to be around 14-15 psi on a stock port with the usual bolt-ons), you are beyond the capabilities of a remapped stock ECU. Don't try to judge the capabilities by horsepower, as each car is different.
If your friend doesn't have any experience modifying the ignition and fuel characteristics of the FD, I'd recommend against trying this route. |
I don't think it's that simple with the FD3S ECU. Pettit, M2 and the others add a daughter board into the stock ECU so they can reprogram them. They wouldn't go through all the added labor/expense if it wasn't absolutely necessary.
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In other words, it costs more for a reason, if not everyone would just remap their stock ecu.
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Oh so there is no way a guy can remap the single factory board that is in the ECU by itself without adding a daughter board? Even if it was a little bit?
I have some mods(sig) and Adam told me that I need to do a fuel mod. I am going to get a Cosmo pump or Nippondenso over the winter, then I was thinking to alter my ECU. If I did the pump, would it compensate enough for my mods without doing the ECU? I am thinking about an M2 cold air box as well. The reason I am also considering this is because not only do I get dyno time, I then know that my ECU would supply enough for my engine, and I could probably get a deal on doing it. Remember I am in Canada..... Thanks again |
Its not that you Can't, Im sure you can, its that its not recommended and probably not as reliable as an actgually piggyback or standalone
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Originally posted by ROTORHP Oh so there is no way a guy can remap the single factory board that is in the ECU by itself without adding a daughter board? Even if it was a little bit? I have no first hand knowledge of it, so I guess you can always take your car over there to see if he really can reprogram the stock unit. However, I would go ahead and prepare yourself for disappointment. |
The memory chip that the ECU uses to determine fuel/ignition curves is a "read only" memory chip. That means the chip itself cannot be changed. Installing a "daughterboard" onto the main "motherboard" basically is stepping in at circuit board level and altering the memory with another ROM chip.
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Mahjik, what about the pump? Will it help me enough until I can get a PFC then?:D
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Originally posted by ROTORHP Mahjik, what about the pump? Will it help me enough until I can get a PFC then?:D You only need to upgrade your fuel pump when you are losing fuel pressure (i.e. your car is requiring more fuel due to larger injectors or a RRFPR and your fuel pump cannot keep up with the new demand). |
Gotcha.... should of thought of it a bit myself.
Kento, thanks for the info. Would the Rx-8 ECU operate in the same fashion as the 7's? If it does, maybe he has ROM boards that he can program? |
I heard a rumor Pettit is working on a new ECU allowing use of larger injectors....can anyone confirm or deny this?
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Originally posted by yzf-r1 I heard a rumor Pettit is working on a new ECU allowing use of larger injectors....can anyone confirm or deny this? |
Can't you use a larger injector with the Pettit ECU's now? They program parameters for what upgrades you have don't they? :)
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Originally posted by ROTORHP Would the Rx-8 ECU operate in the same fashion as the 7's? If it does, maybe he has ROM boards that he can program? |
Originally posted by ROTORHP Can't you use a larger injector with the Pettit ECU's now? They program parameters for what upgrades you have don't they? :) |
I see...while we are on the subject of injectors, how much rwhp can the factory injectors provide at a safe duty cycle?
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Originally posted by ROTORHP I see...while we are on the subject of injectors, how much rwhp can the factory injectors provide at a safe duty cycle? |
You still don't want to run your injectors at max though am I right? A/F ratio is obviously the most important. Yikes...360rwhp. I am hoping for about 330rwhp. So I shouldn't have a problem using the stock sizes and getting the correct A/F ratio? I do plan to keep my twin setup(sequential as well). Thanks for all the info.... you've helped me huge...again:D
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Originally posted by ROTORHP You still don't want to run your injectors at max though am I right? A/F ratio is obviously the most important. Yikes...360rwhp. I am hoping for about 330rwhp. So I shouldn't have a problem using the stock sizes and getting the correct A/F ratio? I do plan to keep my twin setup(sequential as well). Thanks for all the info.... you've helped me huge...again:D https://www.rx7club.com/showthread.p...hreadid=259912 It has a lot of good info, I'm just not in the mood to retype it right now. ;) 330rwhp on the stock fuel system shouldn't be a problem. |
Wade's site has some good info that totally makes sense. Thanks for the thread link and all the info:bigthumb:
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the reason you can reprogram the gm and ford ecu's is beacause the code is well known, along with the other stuff about the fd being read only
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The guy must know some codes however since he worked on a Rx-8 ECU....thats what I want to know....is that ECU read only? What did he do to alter it?...... hmmm I guess I could phone him:D
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Originally posted by ROTORHP The guy must know some codes however since he worked on a Rx-8 ECU....thats what I want to know....is that ECU read only? What did he do to alter it?...... hmmm I guess I could phone him:D If the chip is not flashable, then you can't reprogram it. I would assume most if not all new cars support flashable chips as they (and the supporting hardware/software) are not nearly as expensive to use these days as they were in the late 80's and early 90's. So, I would wager that the stock ECU is not flashable, hence the reason that Pettit, M2 and the others remove the chip to install a daughter board with a different reprogrammed chip. |
If the chip is not flashable, then you can't reprogram it. I would assume most if not all new cars support flashable chips as they (and the supporting hardware/software) are not nearly as expensive to use these days as they were in the late 80's and early 90's. So, I would wager that the stock ECU is not flashable, hence the reason that Pettit, M2 and the others remove the chip to install a daughter board with a different reprogrammed chip. |
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