9m 4tech billet heads tested by Total 911 Magazine
04-30-2009, 11:27 AM
#46
As Geoffrey pointed out the OBD2 issue is more one of a legal nature which depends on where the car is inspected than any thing else. In NYS when a '96 up car is annually inspected the first thing they do is connect the diagnostic port to a dedicated DMV line, any issues will flag the car for failure.
The MY95 and earlier cars don't need to go through this because they are subject to OBD1 regs not the MY96 up OBD2 regs.
Of course other states and other jurisdictions will have their own statutes that will need to be followed
Other issues which are related to differences in MY and country
55pin OBD1 is used on all RoW 993 n/a engines for all years '94-98
88pin OBD2 is used for all 993turbos regardless of country for all years >'98
US/Cdn 993 thru MY'95 use OBD1 55pin, and from '96 up use 88pin OBD2
US/Cdn MY96 only have an additional issue in that the DME does not use a socketed chip. To alter these a '97-98 88 pin OBD2 DME needs to be used.
MoTec can be used to replace any of the engine management systems used for any 993 but is going to be far more costly and complicated on the '96 up.
Geoffrey and Colin have very elegant MoTec systems that have been engineered to work w/ the 55pin OBD1 harnesses, to use w/ the 88pin OBD2 the harness as well as the DME would need to be replaced. These can work w/ oem intakes or ITB intakes
The last concern for going to MoTec to replace Motronic is going to be resale value of the car. I suppose that most anything can be undone but this is a major step away from a car that is going to be desirable to the general public toward a car that is oriented to an extremely small niche market.
Having been in one of Geoffrey's creations and seen his race car at track days I can only say how impressed I have been w/ their functionality, design, and implementation.
The MY95 and earlier cars don't need to go through this because they are subject to OBD1 regs not the MY96 up OBD2 regs.
Of course other states and other jurisdictions will have their own statutes that will need to be followed
Other issues which are related to differences in MY and country
55pin OBD1 is used on all RoW 993 n/a engines for all years '94-98
88pin OBD2 is used for all 993turbos regardless of country for all years >'98
US/Cdn 993 thru MY'95 use OBD1 55pin, and from '96 up use 88pin OBD2
US/Cdn MY96 only have an additional issue in that the DME does not use a socketed chip. To alter these a '97-98 88 pin OBD2 DME needs to be used.
MoTec can be used to replace any of the engine management systems used for any 993 but is going to be far more costly and complicated on the '96 up.
Geoffrey and Colin have very elegant MoTec systems that have been engineered to work w/ the 55pin OBD1 harnesses, to use w/ the 88pin OBD2 the harness as well as the DME would need to be replaced. These can work w/ oem intakes or ITB intakes
The last concern for going to MoTec to replace Motronic is going to be resale value of the car. I suppose that most anything can be undone but this is a major step away from a car that is going to be desirable to the general public toward a car that is oriented to an extremely small niche market.
Having been in one of Geoffrey's creations and seen his race car at track days I can only say how impressed I have been w/ their functionality, design, and implementation.
04-30-2009, 11:29 AM
#47
I'm pretty sure they do unless it is specific to the city in TX. In Austin and surrounding areas they plug into the ODBII port and check the relevent stuff. I know because I failed my first attempt because my emmission rediness codes were not reset from my battery being disconnected.
04-30-2009, 11:34 AM
#48
As Geoffrey pointed out the OBD2 issue is more one of a legal nature which depends on where the car is inspected than any thing else. In NYS when a '96 up car is annually inspected the first thing they do is connect the diagnostic port to a dedicated DMV line, any issues will flag the car for failure.
The MY95 and earlier cars don't need to go through this because they are subject to OBD1 regs not the MY96 up OBD2 regs.
Of course other states and other jurisdictions will have their own statutes that will need to be followed
Other issues which are related to differences in MY and country
55pin OBD1 is used on all RoW 993 n/a engines for all years '94-98
88pin OBD2 is used for all 993turbos regardless of country for all years >'98
US/Cdn 993 thru MY'95 use OBD1 55pin, and from '96 up use 88pin OBD2
US/Cdn MY96 only have an additional issue in that the DME does not use a socketed chip. To alter these a '97-98 88 pin OBD2 DME needs to be used.
MoTec can be used to replace any of the engine management systems used for any 993 but is going to be far more costly and complicated on the '96 up.
Geoffrey and Colin have very elegant MoTec systems that have been engineered to work w/ the 55pin OBD1 harnesses, to use w/ the 88pin OBD2 the harness as well as the DME would need to be replaced. These can work w/ oem intakes or ITB intakes
The last concern for going to MoTec to replace Motronic is going to be resale value of the car. I suppose that most anything can be undone but this is a major step away from a car that is going to be desirable to the general public toward a car that is oriented to an extremely small niche market.
Having been in one of Geoffrey's creations and seen his race car at track days I can only say how impressed I have been w/ their functionality, design, and implementation.
The MY95 and earlier cars don't need to go through this because they are subject to OBD1 regs not the MY96 up OBD2 regs.
Of course other states and other jurisdictions will have their own statutes that will need to be followed
Other issues which are related to differences in MY and country
55pin OBD1 is used on all RoW 993 n/a engines for all years '94-98
88pin OBD2 is used for all 993turbos regardless of country for all years >'98
US/Cdn 993 thru MY'95 use OBD1 55pin, and from '96 up use 88pin OBD2
US/Cdn MY96 only have an additional issue in that the DME does not use a socketed chip. To alter these a '97-98 88 pin OBD2 DME needs to be used.
MoTec can be used to replace any of the engine management systems used for any 993 but is going to be far more costly and complicated on the '96 up.
Geoffrey and Colin have very elegant MoTec systems that have been engineered to work w/ the 55pin OBD1 harnesses, to use w/ the 88pin OBD2 the harness as well as the DME would need to be replaced. These can work w/ oem intakes or ITB intakes
The last concern for going to MoTec to replace Motronic is going to be resale value of the car. I suppose that most anything can be undone but this is a major step away from a car that is going to be desirable to the general public toward a car that is oriented to an extremely small niche market.
Having been in one of Geoffrey's creations and seen his race car at track days I can only say how impressed I have been w/ their functionality, design, and implementation.
04-30-2009, 12:42 PM
#49
Nordschleife Master
Geoffrey and Colin have very elegant MoTec systems that have been engineered to work w/ the 55pin OBD1 harnesses, to use w/ the 88pin OBD2 the harness as well as the DME would need to be replaced. These can work w/ oem intakes or ITB intakes
04-30-2009, 07:00 PM
#51
Ok, sounds like Motec or bust for the moment until another solution comes along to make it street legal... 
Geoffrey, maybe I could pay visit to your shop sometime in the future and take a look at your work...
Geoffrey, maybe I could pay visit to your shop sometime in the future and take a look at your work...
05-01-2009, 09:09 AM
#52
Nordschleife Master
You can, and there will be a magazine article out soon on the white 964 9M USA car that we did last year. You can also do a search on the 964 Forum for "9M USA" where you can see 2 cars we did last year.
