What years can run without a catalytic converter?

[saturnbremen]

I was wondering what year trackers can run without a cat. Anyone know?

[CodyJ]

I think certain states are different, Cali for sure!

If you find a good inspection place they will inspect it no matter what mods...

Buddy has an 89 Mustang GT with no cats, h-pipe, bbk headers... that thing is toxic under the hood and especially following him; but hes legal in Texas.

[saturnbremen]

I took mine off and added a straight pipe in its place today. Its a 1991 1.6l 8valve 4x4 3speed auto. Once I get the tank sending unit from rockauto on monday I'll be able to fire it up and let everyone know what happens.

[94tracker]

they all run fine without but will not pass emissons/smog test

[Ozzy77]

Well here in Panama is not mandatory to have the cat. but I did change mine cause the old one was kind of broken inside, there was a hole in the inside cell so it wasn´t working as a cat. anyway I have it written and with the new one and the old there wasn´t any difference in fuel consuption nor the power,added a header and a 2 inc. exaust(kept the cat) and it does have some extra power(get to higher rpm faster) same mpg. 8 valv. 1.6.

[saturnbremen]

No gas milage improvement? I was kind of under the impression that a 10%+ mpg improvement was in store for me if I did a tune up properly and dumed the gas guzzlin cat.

I remember people buying cars and taking them out back in the early 80s to get better gas milage and more power. At least that was the rumor back then.

[jtgh]

Great question, and for sure no one can answer , on a global scale.
what year ECU's run with out a CAT and no backpressure , and in what countries?

this is a world class car, with 51 export models. at least?
Each ECU has a target market, this is the Enn number.
so if you can find a JDM E01 car , you can hack away.
and most e01 have no CAT and have no EGR.

some dont even have a OXY sen. and just used the MAP to run car ( ect and iat)

each export model has different smog parts and type of injection
most really old ones run carbs.

so really the best question is , what country are you in ?
how hard do you want to work reach your goal.?

most CALif. cars are the worst. they will get real upset with out a cat.
next is any car in the USA , 1994 and newer , which adopted the Cal rules.
i found your car spec. now need country.

if you just give a little more nfo about your car and location one could answer.
i looked at your 7 posts.
1991 4wd tracker 1.6l, 8valve, fuel injected, 3speed automatic with 177k miles
is that you?
the tranny works against you, as it needs AT ECU. (automatic tranny)
do you want MPG, or just an off road crawler which burns lots of fuel.
?

yours is dash 56b40 ecu (my guess?)

everyone here , has diff. expectations.
Daily driver.
short hops 1 time per week
off road only.
or as one guy here has sicdkick go cart !

i read your posts, it is good ,and somehow i missed it.

one rumor is that there are Canadian ECU's that dont need some parts.
code E28 = canada
just this car has five different 8v T throttle bodies from 89 to 91.!
ecu's 60A20 -AT 89
60A42 AT 89
60A01 AT 90
56B40 AT 91 (SAME AS USA)


will any of these run in your car, who knows.?
the TB may not not be compatible at all for 5 reasons.
diff, flow
diff injector flow rates
diff injector coil impedance.
diff TPS
diff iac spec.


seem to me a nice $60 free flow cat is far less work, and saves us all lots of NOX fumes.

on most ECU's here (usa ,canada) the back pressure loss, will render the
EGR mod useless, if that happens the EGR ECU monitor will set code 51 and
drop car in to Limphome mode, (rich and redarded ign. and loss of power, and MPG like 15mpg)

you can test for this, just unplug the EGR VSV electrical connector and
drive , simulating full EGR failure and no vac. leaks.
if car drives perfect and does not get bad mpg, then yours is one of the old dog ECU's.

id try it on my 56b30 but im doing MPG experiments and this would be counter productive.
I have 195deg F thermostat that enhances efficiency quite a bit.

i will answer your other post, now.

cheers.

[jtgh]

what does 1980 have to do with 1990's , nothing , much. sORRY?
different era , different technogly and fuel injection.


the Fact is the ECU is tuned for what the car came with, on production floor.
the first data loaded into the ECU is the volumetric efficiency .
the ability to pump air. in percent . Back pressure mods , change that !

then it is tuned for every load and rpm on a dyno and on the track.
then it is tuned again for the EGR opening. (same for Evap valve)

if you mess with anything the changes those fixed constants, the tune goes off.

next
the ECU has monitors, and will react to your radial changes with punishing limphome mode. "thats right out of the factory FSM"

limphome, rich, ign retarded and loss of power.
if you really mess up , it goes to BACKUP, and runs like a pig. but does run.

some here even try to tune the ECU. and get not too far.
for the best answer on that: Jeff Hartman, read it and ALL ANSWERS ARE THERE.
Amazon.com: How to Tune and Modify Engine Management Systems (Motorbooks Workshop): Jeff Hartman: Books

imho, YMMV, LOL.

CHEERS!

ps. if you change the flow, you got to chain the jets, if you dont have carb you got to change the ECU tuning maps, (spark, fuel, etc)
that is a whole different color of horse.

[saturnbremen]

Originally Posted by jtgh

Great question, and for sure no one can answer , on a global scale.
what year ECU's run with out a CAT and no backpressure , and in what countries?

this is a world class car, with 51 export models. at least?
Each ECU has a target market, this is the Enn number.
so if you can find a JDM E01 car , you can hack away.
and most e01 have no CAT and have no EGR.

some dont even have a OXY sen. and just used the MAP to run car ( ect and iat)

each export model has different smog parts and type of injection
most really old ones run carbs.

so really the best question is , what country are you in ?
how hard do you want to work reach your goal.?

most CALif. cars are the worst. they will get real upset with out a cat.
next is any car in the USA , 1994 and newer , which adopted the Cal rules.
i found your car spec. now need country.

if you just give a little more nfo about your car and location one could answer.
i looked at your 7 posts.
1991 4wd tracker 1.6l, 8valve, fuel injected, 3speed automatic with 177k miles
is that you?
the tranny works against you, as it needs AT ECU. (automatic tranny)
do you want MPG, or just an off road crawler which burns lots of fuel.
?

yours is dash 56b40 ecu (my guess?)

everyone here , has diff. expectations.
Daily driver.
short hops 1 time per week
off road only.
or as one guy here has sicdkick go cart !

i read your posts, it is good ,and somehow i missed it.

one rumor is that there are Canadian ECU's that dont need some parts.
code E28 = canada
just this car has five different 8v T throttle bodies from 89 to 91.!
ecu's 60A20 -AT 89
60A42 AT 89
60A01 AT 90
56B40 AT 91 (SAME AS USA)


will any of these run in your car, who knows.?
the TB may not not be compatible at all for 5 reasons.
diff, flow
diff injector flow rates
diff injector coil impedance.
diff TPS
diff iac spec.


seem to me a nice $60 free flow cat is far less work, and saves us all lots of NOX fumes.

on most ECU's here (usa ,canada) the back pressure loss, will render the
EGR mod useless, if that happens the EGR ECU monitor will set code 51 and
drop car in to Limphome mode, (rich and redarded ign. and loss of power, and MPG like 15mpg)

you can test for this, just unplug the EGR VSV electrical connector and
drive , simulating full EGR failure and no vac. leaks.
if car drives perfect and does not get bad mpg, then yours is one of the old dog ECU's.

id try it on my 56b30 but im doing MPG experiments and this would be counter productive.
I have 195deg F thermostat that enhances efficiency quite a bit.

i will answer your other post, now.

cheers.

KY in the usa. I'd like to make this into a gas saver.

I wish I had looked at the ECU number before I reinstalled it. It had the blown caps, I bought the right ones at digikey and installed them. It had one 50v 100uf cap, and one 50v 47uf cap. Maybe that could identify the ECU.

Tomorrow I'll tear the ECU out again and post what ECU it is.

In the engine compartment it says it conforms to US EPA for 1991. Engine Family ID MSK 1.6T5FFC7
Its the Lsi model
If there are any back pressure issues I can restrict the muffler a bit at a time till it runs and gets good gas mileage. Trial and error, not that glamorous but its all I know how to do at this point in my life.

[saturnbremen]

Originally Posted by jtgh

Great question, and for sure no one can answer , on a global scale.
what year ECU's run with out a CAT and no backpressure , and in what countries?

this is a world class car, with 51 export models. at least?
Each ECU has a target market, this is the Enn number.
so if you can find a JDM E01 car , you can hack away.
and most e01 have no CAT and have no EGR.

some dont even have a OXY sen. and just used the MAP to run car ( ect and iat)

each export model has different smog parts and type of injection
most really old ones run carbs.

so really the best question is , what country are you in ?
how hard do you want to work reach your goal.?

most CALif. cars are the worst. they will get real upset with out a cat.
next is any car in the USA , 1994 and newer , which adopted the Cal rules.
i found your car spec. now need country.

if you just give a little more nfo about your car and location one could answer.
i looked at your 7 posts.
1991 4wd tracker 1.6l, 8valve, fuel injected, 3speed automatic with 177k miles
is that you?
the tranny works against you, as it needs AT ECU. (automatic tranny)
do you want MPG, or just an off road crawler which burns lots of fuel.
?

yours is dash 56b40 ecu (my guess?)

everyone here , has diff. expectations.
Daily driver.
short hops 1 time per week
off road only.
or as one guy here has sicdkick go cart !

i read your posts, it is good ,and somehow i missed it.

one rumor is that there are Canadian ECU's that dont need some parts.
code E28 = canada
just this car has five different 8v T throttle bodies from 89 to 91.!
ecu's 60A20 -AT 89
60A42 AT 89
60A01 AT 90
56B40 AT 91 (SAME AS USA)


will any of these run in your car, who knows.?
the TB may not not be compatible at all for 5 reasons.
diff, flow
diff injector flow rates
diff injector coil impedance.
diff TPS
diff iac spec.


seem to me a nice $60 free flow cat is far less work, and saves us all lots of NOX fumes.

on most ECU's here (usa ,canada) the back pressure loss, will render the
EGR mod useless, if that happens the EGR ECU monitor will set code 51 and
drop car in to Limphome mode, (rich and redarded ign. and loss of power, and MPG like 15mpg)

you can test for this, just unplug the EGR VSV electrical connector and
drive , simulating full EGR failure and no vac. leaks.
if car drives perfect and does not get bad mpg, then yours is one of the old dog ECU's.

id try it on my 56b30 but im doing MPG experiments and this would be counter productive.
I have 195deg F thermostat that enhances efficiency quite a bit.

i will answer your other post, now.

cheers.

http://carfix.stufftoread.com/ECU/Tracker-ECU-91wa.jpg
The ECM on that page... Its just like my ECM.