ECM tuning question
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From: Manama Bahrain
ECM tuning question
Why cant tuners reflash a computer to OBD1, obd2 etc? Leave the wiring harnesses out of the equation for the moment. I just want to know why cant each computer be totally earaced and programed with whatever?
I ask this question because I want my 93 computer to have all the 94 abilities except maf. Sounds easy enough. Opinions please.
I ask this question because I want my 93 computer to have all the 94 abilities except maf. Sounds easy enough. Opinions please.
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From: VA
Originally Posted by honda hunter
Why cant tuners reflash a computer to OBD1, obd2 etc? Leave the wiring harnesses out of the equation for the moment. I just want to know why cant each computer be totally earaced and programed with whatever?
I ask this question because I want my 93 computer to have all the 94 abilities except maf. Sounds easy enough. Opinions please.
I ask this question because I want my 93 computer to have all the 94 abilities except maf. Sounds easy enough. Opinions please.
For one thing, OBD2 requires an EEPROM, which is why they changed to that in 94. The 94 presumably has more I/O ports as well, since it has to deal with several more inputs than the 93, and perhaps more outputs (for instance for the SFI). I think the comms bus is at a different speed, but not sure about that.
Le Mans Master
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From: Portland Oregon
Originally Posted by honda hunter
Why cant tuners reflash a computer to OBD1, obd2 etc? Leave the wiring harnesses out of the equation for the moment. I just want to know why cant each computer be totally earaced and programed with whatever?
I ask this question because I want my 93 computer to have all the 94 abilities except maf. Sounds easy enough. Opinions please.
I ask this question because I want my 93 computer to have all the 94 abilities except maf. Sounds easy enough. Opinions please.
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From: Manama Bahrain
Originally Posted by Vis Croceus
That's like asking why can't my Hyundai go as fast as my Corvette if I change the software? Or, more to the point, why can't my SPARC run MacOS? Because the hardware is different.
Originally Posted by Vis Croceus
For one thing, OBD2 requires an EEPROM, which is why they changed to that in 94.
Originally Posted by Vis Croceus
The 94 presumably has more I/O ports as well, since it has to deal with several more inputs than the 93,
Originally Posted by Vis Croceus
and perhaps more outputs (for instance for the SFI).
Originally Posted by Vis Croceus
I think the comms bus is at a different speed, but not sure about that.
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From: Manama Bahrain
Originally Posted by tjwong
The hardware is totally different, and comm protocals to the CCM is different in 94/5 and then 96 is even different from the 94/5 PCMs. In 96 a crank sensor was added for mis-fire diagnostics, and additional memory was added to the PCM to handle the additional on board diagnostics for the OBD2 spec. If you really want a MAF you can use a f body 16188051 PCM and piggy back it to your 93 system. However its not really worth all the work and expense as there are no gains in performane provided that both systems are tuned properly for the modifications.
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From: VA
Originally Posted by honda hunter
That's somewhat of a bit exaggerated dont you think lol.
Originally Posted by honda hunter
This is going to sound retarded but the biggest reason I want OBD 1 is so I can use scanmaster. That thing was great. I wish they had something like that for the 93.
OBD1 started in the early 80s. I would assume that every C4 is OBD.
94-95 is sometimes referred to as OBD1.5
If you want more info on the differences between 93 and 94, search this forum, the tuning forums at other LT1 sites, and Google. There's tons of info out there.
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From: Manama Bahrain
Originally Posted by Vis Croceus
No, actually, it's that simple.
93 is OBD1.
OBD1 started in the early 80s. I would assume that every C4 is OBD.
94-95 is sometimes referred to as OBD1.5
If you want more info on the differences between 93 and 94, search this forum, the tuning forums at other LT1 sites, and Google. There's tons of info out there.
93 is OBD1.
OBD1 started in the early 80s. I would assume that every C4 is OBD.
94-95 is sometimes referred to as OBD1.5
If you want more info on the differences between 93 and 94, search this forum, the tuning forums at other LT1 sites, and Google. There's tons of info out there.
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From: Manama Bahrain
Originally Posted by 93 ragtop
This may be dumb, but what is scanmaster? I have datamaster that I use for my 93 as well as a Auto xray.
Le Mans Master
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From: Portland Oregon
Originally Posted by honda hunter
Dangit. In my head it seemed so simple. This is going to sound retarded but the biggest reason I want OBD 1 is so I can use scanmaster. That thing was great. I wish they had something like that for the 93.
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From: Manama Bahrain
Originally Posted by tjwong
You can use Datamaster which is just as good. And you can find an earlier hacked copy of version 3.4 or something like that on the internet.
Le Mans Master
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From: Manassas VA
How is scanmaster on data logging? The problem with Auto X-Ray was it would log but only up to 2 scans a second for 15 seconds. Datamaster will log 10 scans a second for at least 30 min. or more. But I do see your point on carrying a laptop around.
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From: Manama Bahrain
Originally Posted by 93 ragtop
How is scanmaster on data logging? The problem with Auto X-Ray was it would log but only up to 2 scans a second for 15 seconds. Datamaster will log 10 scans a second for at least 30 min. or more. But I do see your point on carrying a laptop around.
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From: Manama Bahrain
Originally Posted by 93 ragtop
well what I use for mine is a 30 dollar power inverter. You plug it into the cigerette lighter plug and it converts to 110volts. then just plug the laptop transformer into that.
