a few more MS/LC1 questions.
08-30-2008, 11:47 PM
#1
Junior Member
Thread Starter
Join Date: May 2007
Location: San Diego
Posts: 380
Total Cats: 0
a few more MS/LC1 questions.
First of all, on a 1994, I do not have to pull or do anything with the igniter correct?
For my LC-1, It seems there is not enough outputs for a gauge, the MS and the for the stock ecu to be happy. Is there any way around this?
Lastly (for now) Has anyone bought the ebay Serial to Usb adapter and still have the drivers?
For my LC-1, It seems there is not enough outputs for a gauge, the MS and the for the stock ecu to be happy. Is there any way around this?
Lastly (for now) Has anyone bought the ebay Serial to Usb adapter and still have the drivers?
Reply
0
0
08-31-2008, 12:14 AM
#5
Yeah perhaps you are pulling the fuse that kills power to the ignitor? I personally would unplug the igniter so you KNOW it's not gonna fry when burning firmware.
Not 100% but IIRC the MS can read the same signal the guage reads. MS is adjustable. You just specify the voltage and AFR's. ( ex. 10:1@1V 20:1@5V).
Not 100% but IIRC the MS can read the same signal the guage reads. MS is adjustable. You just specify the voltage and AFR's. ( ex. 10:1@1V 20:1@5V).
Reply
0
0
08-31-2008, 12:43 AM
#6
Boost Pope
iTrader: (8)
Join Date: Sep 2005
Location: Chicago. (The less-murder part.)
Posts: 33,020
Total Cats: 6,588
First- we seem to confusing "the fuse" and the igniter, and misunderstanding the purpose of pulling each.
In the '90-93, the "ST SIGN" fuse must be permanently removed if you are using an MSPNP. This is due to the rather unorthodox (and clever) method they are using to cheat and make the fuel pump work, as in these cars the fuel pump was not originally controlled by the ECU. They're actually back-feeding power into a certain part of the starting circuit which happens to also hit the FP relay. This applies only to '90-'93 cars using MSPNP. Other years, or those using regular DIY megasquirts, need not pull this fuse.
For all years, you must disconnect the igniter(s) when performing a firmware update to the MS, regardless of whether it is an MSPNP or a regular DIY MS. In '90-'93, the igniter is a separate unit on the right fender well, with one large connector. In '94+, the igniters are built into the coils, so you must disconnect the two 3 or 4 pin coil connectors. The reason for this is that while MS is taking a firmware download, the pins which drive the igniters float high and stay there. If the igniters are left connected and powered on during this procedure, they will burn out. Yes, this even applies to COP.
In all Miatas, power to the ignition system comes from the same fuse that drives the main relay and supplies power to the ECU. Since most of us take power from this line to drive the MS, there is no fuse that you can pull to depower the ignition while still leaving the MS online and able to take a firmware update. There is no alternative to disconnecting the igniters, other than removing the wires which connect the two ignition trigger outputs of the MS to the factory harness, which is generally much more difficult than just popping the two connectors off the coils.
The LC1 has two analog outputs, both of which are configurable. You could set one up to wideband mode and parallel it to both the MS and the gauge, and set the other to NB mode and send it to the stock ECU. Or, you could just leave the stock NB in place to drive the stock ECU until such time that you man up and go full standalone.
"The" ebay adapter? As if to imply that every single one of the hundreds of eBay vendors who sell a USB-RS232 adapter all sell the exact same one? Dude...
In the '90-93, the "ST SIGN" fuse must be permanently removed if you are using an MSPNP. This is due to the rather unorthodox (and clever) method they are using to cheat and make the fuel pump work, as in these cars the fuel pump was not originally controlled by the ECU. They're actually back-feeding power into a certain part of the starting circuit which happens to also hit the FP relay. This applies only to '90-'93 cars using MSPNP. Other years, or those using regular DIY megasquirts, need not pull this fuse.
For all years, you must disconnect the igniter(s) when performing a firmware update to the MS, regardless of whether it is an MSPNP or a regular DIY MS. In '90-'93, the igniter is a separate unit on the right fender well, with one large connector. In '94+, the igniters are built into the coils, so you must disconnect the two 3 or 4 pin coil connectors. The reason for this is that while MS is taking a firmware download, the pins which drive the igniters float high and stay there. If the igniters are left connected and powered on during this procedure, they will burn out. Yes, this even applies to COP.
In all Miatas, power to the ignition system comes from the same fuse that drives the main relay and supplies power to the ECU. Since most of us take power from this line to drive the MS, there is no fuse that you can pull to depower the ignition while still leaving the MS online and able to take a firmware update. There is no alternative to disconnecting the igniters, other than removing the wires which connect the two ignition trigger outputs of the MS to the factory harness, which is generally much more difficult than just popping the two connectors off the coils.
The LC1 has two analog outputs, both of which are configurable. You could set one up to wideband mode and parallel it to both the MS and the gauge, and set the other to NB mode and send it to the stock ECU. Or, you could just leave the stock NB in place to drive the stock ECU until such time that you man up and go full standalone.
Originally Posted by jobamo
Has anyone bought the ebay Serial to Usb adapter
Reply
0
0
08-31-2008, 01:18 AM
#7
Junior Member
Thread Starter
Join Date: May 2007
Location: San Diego
Posts: 380
Total Cats: 0
First- we seem to confusing "the fuse" and the igniter, and misunderstanding the purpose of pulling each.
In the '90-93, the "ST SIGN" fuse must be permanently removed if you are using an MSPNP. This is due to the rather unorthodox (and clever) method they are using to cheat and make the fuel pump work, as in these cars the fuel pump was not originally controlled by the ECU. They're actually back-feeding power into a certain part of the starting circuit which happens to also hit the FP relay. This applies only to '90-'93 cars using MSPNP. Other years, or those using regular DIY megasquirts, need not pull this fuse.
For all years, you must disconnect the igniter(s) when performing a firmware update to the MS, regardless of whether it is an MSPNP or a regular DIY MS. In '90-'93, the igniter is a separate unit on the right fender well, with one large connector. In '94+, the igniters are built into the coils, so you must disconnect the two 3 or 4 pin coil connectors. The reason for this is that while MS is taking a firmware download, the pins which drive the igniters float high and stay there. If the igniters are left connected and powered on during this procedure, they will burn out. Yes, this even applies to COP.
In all Miatas, power to the ignition system comes from the same fuse that drives the main relay and supplies power to the ECU. Since most of us take power from this line to drive the MS, there is no fuse that you can pull to depower the ignition while still leaving the MS online and able to take a firmware update. There is no alternative to disconnecting the igniters, other than removing the wires which connect the two ignition trigger outputs of the MS to the factory harness, which is generally much more difficult than just popping the two connectors off the coils.
The LC1 has two analog outputs, both of which are configurable. You could set one up to wideband mode and parallel it to both the MS and the gauge, and set the other to NB mode and send it to the stock ECU. Or, you could just leave the stock NB in place to drive the stock ECU until such time that you man up and go full standalone.
"The" ebay adapter? As if to imply that every single one of the hundreds of eBay vendors who sell a USB-RS232 adapter all sell the exact same one? Dude...
In the '90-93, the "ST SIGN" fuse must be permanently removed if you are using an MSPNP. This is due to the rather unorthodox (and clever) method they are using to cheat and make the fuel pump work, as in these cars the fuel pump was not originally controlled by the ECU. They're actually back-feeding power into a certain part of the starting circuit which happens to also hit the FP relay. This applies only to '90-'93 cars using MSPNP. Other years, or those using regular DIY megasquirts, need not pull this fuse.
For all years, you must disconnect the igniter(s) when performing a firmware update to the MS, regardless of whether it is an MSPNP or a regular DIY MS. In '90-'93, the igniter is a separate unit on the right fender well, with one large connector. In '94+, the igniters are built into the coils, so you must disconnect the two 3 or 4 pin coil connectors. The reason for this is that while MS is taking a firmware download, the pins which drive the igniters float high and stay there. If the igniters are left connected and powered on during this procedure, they will burn out. Yes, this even applies to COP.
In all Miatas, power to the ignition system comes from the same fuse that drives the main relay and supplies power to the ECU. Since most of us take power from this line to drive the MS, there is no fuse that you can pull to depower the ignition while still leaving the MS online and able to take a firmware update. There is no alternative to disconnecting the igniters, other than removing the wires which connect the two ignition trigger outputs of the MS to the factory harness, which is generally much more difficult than just popping the two connectors off the coils.
The LC1 has two analog outputs, both of which are configurable. You could set one up to wideband mode and parallel it to both the MS and the gauge, and set the other to NB mode and send it to the stock ECU. Or, you could just leave the stock NB in place to drive the stock ECU until such time that you man up and go full standalone.
"The" ebay adapter? As if to imply that every single one of the hundreds of eBay vendors who sell a USB-RS232 adapter all sell the exact same one? Dude...
So it IS okay to have 1 output wire powering both the MS and the gauge, would it still be accurate?
By the adapters, it all seems to be made by 1 company so i suspect they all the same, but to make it more clear, anyone have drivers for this guy
Im sure ill have a bunch more questions tomorrow when i finally install this thing.
Reply
0
0
08-31-2008, 11:05 PM
#8
Boost Pope
iTrader: (8)
Join Date: Sep 2005
Location: Chicago. (The less-murder part.)
Posts: 33,020
Total Cats: 6,588
If using the cheaper DB or G series analog gauges, I am assuming that it must be a high impedance load, so the parallelling should work. You'll have to calibrate the output for what the gauge wants (7.35 to 22.39) and then scale the MS input appropriately.
By the adapters, it all seems to be made by 1 company so i suspect they all the same, but to make it more clear, anyone have drivers for this guy
I bought mine open-box from Fry's for $5. On the back, it had a little sticker that said GUC232. I typed that into Google, and within ten minutes found the driver.
Reply
0
0
Thread
Thread Starter
Forum
Replies
Last Post
bigmackloud
Miata parts for sale/trade
19
01-08-2021 11:24 AM
StratoBlue1109
Miata parts for sale/trade
7
09-24-2015 03:50 PM
