RE: FGMT Comp. 4x4 build
dc2 man, I have read the posts and it doesn't make sense, I know what the elcon thing does, it will reinforce the rim square, but that does not help if the FG axle square is loose. The elcon thingy relies on the axle square on the axle. Oh well, never mind, I thought it was something else you have found, something that would prevent the FG axle square from coming loose, but it's not. Anyway, when it comes loose, it that because the screws go loose?
Posted on: 7/18/2009 5:15 AM by Author "Futterama" in the forum "RC Giant Scale Cars"
http://www.rcuniverse.com/forum/fb.asp?m=8943087

RE: FGMT Comp. 4x4 build
dc2 man, thanks for the link and I found the pictures where you mount the adapters. But those won't keep the squares from coming loose and it won't stop the axle from spinning if the square comes loose. As I can understand, the adapters are primarily for rims with broken rim squares. So how would this help?
Posted on: 7/18/2009 3:28 AM by Author "Futterama" in the forum "RC Giant Scale Cars"
http://www.rcuniverse.com/forum/fb.asp?m=8943008

RE: FGMT Comp. 4x4 build
dc2 man, could you please link to the Elcon part you mentioned? I can't find any Elcon part that looks different from the FG parts. A picture of your upgrade would also be appreciated. Thanks.
Posted on: 7/17/2009 4:56 PM by Author "Futterama" in the forum "RC Giant Scale Cars"
http://www.rcuniverse.com/forum/fb.asp?m=8941856

RE: New CDI - opensource project JMJ and Bigboat
Hi Dave, You need to remove some of the plastic in the transformer to make the windings fit. There are some "walls" seperating the windings, these need to be removed. Have you done this? Best regards, Futterama
Posted on: 6/26/2009 6:12 AM by Author "Futterama" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=8882180

RE: Opensource CDI ignition
Try opening the .c files in MikroC, and try opening the spreadsheet. You will se that you need to copy-paste data from the spreadsheet to MikroC. You then use MikroC to compile/produce the .hex file that you will load into the PIC using a PIC programmer.
Posted on: 3/25/2009 6:05 AM by Author "Futterama" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=8614252

RE: New CDI - opensource project JMJ and Bigboat
Kymmy, let's see some good quality pictures of those coils and the test-board :-)
Posted on: 2/6/2009 2:27 AM by Author "Futterama" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=8444263

RE: Opensource CDI ignition
Bigboat, I'm not trying to make you tell how my HV circuit will perform. I'm trying to compare which is most efficient. If my circuit will run for 2 hours on a 2000mAh 6V battery, then you'r circuit is 3 times more efficient and something needs to be changed in my circuit. You see?
Posted on: 1/22/2009 1:01 PM by Author "Futterama" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=8388107

RE: Opensource CDI ignition
Bigboat, I'm just trying to compare efficiency between the 2 different kind of HV circuits.
Posted on: 1/22/2009 12:35 PM by Author "Futterama" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=8388018

RE: Opensource CDI ignition
Bigboat, my question is still unanswered - at which RPM does the CDI work for 6 hours with a 2000mAh 6V battery?
Posted on: 1/22/2009 7:21 AM by Author "Futterama" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=8387067

RE: Opensource CDI ignition
[quote]ORIGINAL: Bigboat No generator, only batteries and the CDI can run for about 6 hours on a 6V 2000mA NiMh. [/quote] Bigboat, at which RPM can your CDI run for so long on that battery?
Posted on: 1/22/2009 4:09 AM by Author "Futterama" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=8386875

RE: Opensource CDI ignition
Hi again, I wrote Linear and Coilcraft, and they suggested me to use the new Linear Technology LT3751 with a CoilCraft GA-3460-BL. This will charge a 200µF capacitor to 500V in 200ms with an input voltage of 12V. So I guess it could charge the 470nF in about 0.5ms with the input voltage at 12V. The voltage range goes all the way down to 4.75V so it will also run on 6V, but the charge time will increase, but I guess it will still be below 2ms. My goal is a charge time around 2ms so I can use the CDI on a tuned Zenoah G260RC (on FG RC cars) - these can run above 20.000rpm so if the CDI can handle 30.000rpm (2ms), it will be fine. Also, I think I will add a separate battery for the CDI, I don't think it will be a good idea to use the receiver battery because of the power consumption and electric noise. I have another project going on, which will require 3 or 4 cells LiPo to be mounted on the FG car, so I will have 11.1-14.8V available for the CDI also.
Posted on: 1/22/2009 2:26 AM by Author "Futterama" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=8386794

RE: Opensource CDI ignition
[quote]ORIGINAL: Bigboat Our HV-coil makes about 400 till 600 Volt, depent how the coil is wind and how the ocsilator is working. Raisetime untill 150 Volt less than 3ms, 400 till 600 Volt within 3ms [/quote] I have just downloaded a simulation program for the Linear LT3750 and I set the cap to 470nF and the result is charge time 0.6ms to 150V and 2.9ms to 400V, so it looks promising.
Posted on: 1/19/2009 4:30 PM by Author "Futterama" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=8376760

RE: New CDI - opensource project JMJ and Bigboat
[quote]ORIGINAL: Kymmy Rob's (BIGBOATS) CDI page has recently vanished from the web... [/quote] It works fine for me on this address: http://www.modelbouw.gompy.net/newcdi/newcdi.htm
Posted on: 1/19/2009 6:15 AM by Author "Futterama" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=8374993

RE: Opensource CDI ignition
Hi, I have now received both the LT3750 and the DA2034 but I don't know when I will get the time to work with it. The coil looks nice and small and the LT3750 is a 10-Lead Plastic MSOP and that is smaller than the SOIC I'm used to work with, so there is a challenge for me just to solder the LT3750 [8|] Uwe, please notice the Recommended Board Layout on page 11 in the LT3750 datasheet before testing [;)] /Martin
Posted on: 11/23/2008 10:12 AM by Author "Futterama" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=8174859

RE: Opensource CDI ignition
Uwe, I hope you have more time to experiment than I do, because I would really like to know if it will work for the CDI. Good luck :-)
Posted on: 11/16/2008 7:05 AM by Author "Futterama" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=8152341

RE: Opensource CDI ignition
John, I have not been working with the schematic at SportDevices. I just got some inspiration there, to look for a flyback controller and that was how I found the LT3750. I haven't had the time to test anything, actually I haven't even received the parts as I ordered them only a few days ago. I ordered the LT3750 and Coilcraft DA2034 and I'm waiting for them to arrive, and for me to get time to work with them. The reason why I picked the LT3750 was because they had some transformer recommendations so I knew I didn't need to wind my own transformer. A lot of people here have requested a schematic with a ready-built transformer. Perhaps this is the answer, only time will tell (we have the answer when someone have tested it). Martin
Posted on: 11/12/2008 8:55 AM by Author "Futterama" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=8139514

RE: Opensource CDI ignition
Hi Uwe, Look at this link: http://www.sportdevices.com/ignition/inverter.htm They claim that the circuit charges a 1uF capacitor at 250 volt in approx. 1 ms. I couldn't find any recommended transformers for Texas Instruments UC3845 but then I found the Linear Technology LT3750. Linear claim this about the LT3750: "A typical application can charge a 100μF capacitor to 300V in less than 300ms" so I guess it can charge the 0.47µF in less than 3ms. They have several recommendations regarding the transformer: TDK, Sumida, Midcom and Coilcraft. The datasheet contains the part numbers for the recommended transformers. I ordered a Coilcraft transformer and the LT3750 but I won't have the time to test it anytime soon. I hope some of this can help you. Regards, Martin from Denmark
Posted on: 11/12/2008 2:15 AM by Author "Futterama" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=8139158

RE: New CDI - opensource project JMJ and Bigboat
[quote]ORIGINAL: Bigboat Faster is NOT more force, faster is only faster. You have to slowdown the *heavywheel* with a brake. A simple solution, take a wheel from a moped with brake, mount the wheel on the engine (with a cord), start the engine, hit the brake, and now you have the move the timing to see if you get more force. [/quote] How do I see if I get more force? Would the wheel not spin faster if the force is increased?
Posted on: 11/7/2008 1:58 AM by Author "Futterama" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=8122924

RE: Opensource CDI ignition
Bigboat, can you explain why the B1 high voltage transformer is separated into 3 coils? If someone told me to generate high voltage, I would just use a square AC on a single primary winding.
Posted on: 10/7/2008 7:07 AM by Author "Futterama" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=8026082

RE: Opensource CDI ignition
I bought 3 BT151-800R for 30DKR ~ $6 (USD) so I'll just use them. I have a lot of different MOSFETs but they are low voltage (20-30V) and high power (80-150A) so because of the low voltage, they are not suitable. Bigboat, I also bought the Velleman FLPS, and got it disassembled but I can't figure out how to wind 400 winds of 0.25mm (AWG30) copperwire onto the plastic holder. According to my calculations and measurements on the plastic holder, there is only room for 365 windings on 3 "sections" and the last section is used for the 0.5mm (AWG24) wire, and I tried to wind 20 windings with AWG24 and it can barely fit. How did you wind it? Did you remove the wall seperating the sections to get more room for windings?
Posted on: 7/5/2008 2:29 PM by Author "Futterama" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=7696785

RE: Opensource CDI ignition
[quote]ORIGINAL: jpanhalt I can't read your schematic. The lousy JPG resolution makes reading any part identifiers almost impossible. On Bigboat's site, T1 is an ignition coil. Q1 is the thyristor. [/quote] Check again, I changed the attachment so it's now readable and both the bobine and the thyristor is called T1. The attachment was created from this image: http://www.modelbouw.gompy.net/newcdi/cdi-a.jpg
Posted on: 7/1/2008 4:49 AM by Author "Futterama" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=7680946

RE: Opensource CDI ignition
[quote]ORIGINAL: Futterama Is there a special reason why T1 is a thyristor and not e.g. a MOSFET? [/quote] When looking at the schematic, there should be no doubt of what I'm talking about when I say T1.
Posted on: 7/1/2008 4:47 AM by Author "Futterama" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=7678554

RE: New CDI - opensource project JMJ and Bigboat
[quote]ORIGINAL: villekille If you carefully adjust the timings for the whole RPM range, the engine will work with less fuel and also feel more responsive. Also, when the timing map is correct, the engine works at it's maximum efficiency in lower and higher rpms. [/quote] How do you find the correct timing for a specific RPM value? My idea: Load the engine, let it spin a "heavy" wheel or something. Rev it up to e.g. 5000 RPM. Adjust the timing a bit so the engine will run faster = more power. Throttle back down to 5000 RPM and adjust the timing a bit again until you find the timing that gives most RPM with the lowest throttle. Do this for every 500 or 1000 RPM depending on the "timing resolution" you want. I don't know what the practical "timing resolution" would be, you tell me [:D] Is my idea all wrong?
Posted on: 6/24/2008 5:41 AM by Author "Futterama" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=7654435

RE: Opensource CDI ignition
I ordered the gray Zenoah coil, it will arrive in a few weeks. I have a question about the high voltage circuit: Is there a special reason why T1 is a thyristor and not e.g. a MOSFET? Is it because the PIC gives a short trigger pulse to T1 and T1 will conduct only until the bobine will give a burst of flyback voltage? So the thyristor will shut down automatically when all the energy from the capacitor has been released? I also have a question about the rewinding of the FLPS1 E-core: is it possible to disassemble the E-core so it's easy to wind the copperwire? I think it is possible to disassembly the E-core on the middle so you end up with 2 E's. But that does not make it much easier to wind. How did you (Bigboat) do it? I'm thinking something like make a stick the same size and shape as the inner of the E-core, and put some paper and tape around it, and then wind the copperwire onto the stick/paper/tape, and then transfer the finished windings with paper and tape to the E-core and reassemble it. But I don't know if this would make a good transformer...
Posted on: 6/24/2008 5:32 AM by Author "Futterama" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=7654425

RE: Opensource CDI ignition
The bobine will have to have that extra input for shorting the magnetic field to stop the engine, right? And then we use that input to put in the voltage from the HV coil to generate the spark, am I correct? The grey Zenoah coil, is that this one: [image]http://www.davesmotors.com/store/media/ee300g230rcignitioncoil.jpg[/image] It seems black to me so I'm not sure. This is the one for Zenoah/CY engines used on largescale cars (FG, HPI Baja, MCD). The Zenoah engines are called G230RC and G260RC. The windings for the FLPS1 should be 0.2mm??? If you can answer all my questions [;)] I will seriously build this project and adapt it to a Zenoah G260RC and I will ofcource post all about it here [8D]
Posted on: 6/20/2008 2:45 AM by Author "Futterama" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=7640198

RE: Opensource CDI ignition
Bigboat, when I read about the "New CDI" on your website, I'm missing information about the bobine and the rewinding of the FLPS-1 transformer.
Posted on: 6/19/2008 3:18 PM by Author "Futterama" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=7638021

RE: Opensource CDI ignition
So did anyone ever fully complete this project? I'm very interested in building my own, the problem is the high voltage circuit, I don't know a whole lot about high voltage but I do know lots of PIC's and programming them.
Posted on: 6/19/2008 9:29 AM by Author "Futterama" in the forum "Engine Conversions"
http://www.rcuniverse.com/forum/fb.asp?m=7636906

Needle adjustment on Infinity Samurai 528
Hello forum, I have an Infinity Samurai 528 engine and the manual says not to adjust the "Spray Nozzle". But unfortunately I had the carburetor disassembled and now I can't figure out how to set the Spray Nozzle. For a long time I had it turned all the way in since a factory new engine had it turned all the way in. But now an experienced nitro driver says it needs adjustment although he doesn't know this exact engine. The manufacturer is no good for answering questions, I tried that. If any of you know this engine, please tell me how the Spray Nozzle should be adjusted. Thanks.
Posted on: 6/18/2008 2:33 AM by Author "Futterama" in the forum "Car Nitro & Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=7632144

RE: Help on Infinity Samurai 528 engine
[quote]ORIGINAL: ryan_t888 I have taken a picture and have shown what the spray bar/LSN looks like. Is this similar to what you are talking about? [/quote] Yes, I think so.
Posted on: 4/10/2006 3:52 AM by Author "Futterama" in the forum "Car Nitro & Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=4146379

RE: Help on Infinity Samurai 528 engine
.). This is about 1.5mm from flush for your reference. So my problem is solved :-) Regards, Futterama
Posted on: 4/9/2006 4:37 AM by Author "Futterama" in the forum "Car Nitro & Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=4142705