Wide band 14.7????

[my98gsx]

I just bought a wideband kit for my 98 GSX. In the paper work it said that 14.7 is "ideal" conditions... Is this true? - when tuning should i try to get as close as this as possible?Whats the point of too lean, or too rich? - I had my car dyno tuned at Victor Research and looking at my dyno sheet they tuned it so 11.7? if so my car was running very rich and would explain why a fully built 2.3 stroker engine & 57 trim turbo only made 372whp... Slowboy said that thats very low numbers! - look for your self http://youtube.com/watch?v=gGhwmgdlrhg

 

[silvermitsu10]

Some 95's were OBDI and I think after June or July of 1995 they switched to OBDII. Easy way to tell if you got an OBDI is to look at the exhaust after the cat and see if there is a secon o2 sensor. If not it's OBDI, if so it's OBDII. I'm not sure if the Eprom ecu was only used in the OBDI or not. I don't know how they incorperated the Eprom and how they phased it out.

 

[PieEyedPiper]

"What is OBD?
What is OBD-I?
What is OBDII?

OBD is an acronym for "On Board Diagnostics". OBD-I was version 1, OBD-II is version 2.

There are actually three different possible interfaces within the OBD-II standard: PMW, ISO, and PMZ. [So much for standardization....] All 2G DSM's use the ISO version of the interface, so any diagnostic equipment used must also support the ISO version of OBD-II."

www.vfaq.com

If you know something that I don't, please share...

Does this, itself, not indicate thats 95's are ODBII?

All 2G's are ODBII.
95's are 2G's.
Therefore, 95's are ODBII.

 

[mnetwork]

Does this, itself, not indicate thats 95's are ODBII?

All 2G's are ODBII.
95's are 2G's.
Therefore, 95's are ODBII.

That's always what I thought..

 

[PieEyedPiper]

Does this, itself, not indicate thats 95's are ODBII?

All 2G's are ODBII.
95's are 2G's.
Therefore, 95's are ODBII.

Besides, I've never heard of anyone picking up an 95 E-PROM and going to the newbie section to complain that their shit is ODBI and they can't hook up their 2g DSMLINK etc etc.

IF any were ODBI, I'd imagine its not any of the E-PROMS.

 

[DGajre777]

So why does this site state that 95 2Gs were not fully OBDII compliant?



http://www.obdii.com/connector.html#dates

To me that means that the OBDII port was there, but not all 95 2Gs were OBDII Compliant.

 

[ekanddsm]

What I was taught was if the vehicle was a new design for model year 1995 the vehicle was to be obd2 compliant.

If the car was a redesign or new model for 1995 it has obd2, emission levels for obd2 were federal standards and CA/NY standards.

Several cars were new models in 1995 and all had obd2 connectors and emission monitorings.

All cars were required to have it as of Model year1996

So it is very true to say all 2g's have obd2
Thank you goverment

 

[ekanddsm]

Also redirecting to someones concern about 14.7 as being stoich.

The ecm is directed to vary around 14.7 stoich, thats why during closed loop, (cruise and idle, soft acceleration) the 02 voltages will dance between .1 and .9-1.0, it gives the catalytic converter a chance to burn the emissions that are being pushed through it.

The ecm has the ability to maintain 14.7, but the cat would just overheat because cycling between lean and rich give it a chance to burn the emissions.

14.7 is just for emissions, but it gives a good idea of how the engine is running, instead of old school carb's where they would pull a spark plug out and analyze it.

You want to be rich when you tune your car, richer than 14.7, to keep the heat level down, for long life of the engine. But more heat=More burn=more pressure pushing pistons down!

 

[DGajre777]

I stand corrected then, about all 2Gs being OBDII.

 

[mnetwork]

So confused.. what is partial compliancy then..

 

[ekanddsm]

2g's for year 95 had all the obd2 equipment- but were not certified as obd2
All the stuff was there, they just didnt officially say yup its obd2 until 96 like everyone else
You can look at a number of different cars for 1995 that were new that year

They will be equipped with a obd2 connector, evap emissions, etc. etc.
If you pull codes on a car, P0100 MAF circuit malf(or whatever)The P stands for powertrain,B- Body, U-communcation, C-Safety(Abs) these were all obd2 standards

Obd2 is alot more complicated they dsm'ers give it.

all right i'm done bitchin

 

[silvermitsu10]

Also redirecting to someones concern about 14.7 as being stoich.

The ecm is directed to vary around 14.7 stoich, thats why during closed loop, (cruise and idle, soft acceleration) the 02 voltages will dance between .1 and .9-1.0, it gives the catalytic converter a chance to burn the emissions that are being pushed through it.

The ecm has the ability to maintain 14.7, but the cat would just overheat because cycling between lean and rich give it a chance to burn the emissions.

14.7 is just for emissions, but it gives a good idea of how the engine is running, instead of old school carb's where they would pull a spark plug out and analyze it.

You want to be rich when you tune your car, richer than 14.7, to keep the heat level down, for long life of the engine. But more heat=More burn=more pressure pushing pistons down!

Richer than 14.7 isn't exactly a good thing for the life of the engine. True it may keep in cylinder temps down but you also run the risk of ruining the piston ring, and in some very rare cases... mostly vtec hondas as it were... possibly hydrolocking. With to much fuel in the cylinder the ring tends to not seal as well, and will wear prematurely. You also dump black smoke and smell like raw fuel when running to rich=bad for CAT. if you still have one. If you don't run a cat, I don't, and the system heats up to much then to much fuel is dumped in the cylinders you will get massive backfires and sometimes fire out of te tail pipe. Any time this is happening there is damage bieng done somewhere.

 

[silvermitsu10]

So confused.. what is partial compliancy then..

my thoughts exactly. And why doesn't mine have a downstream o2? You can't run OBDII without a downstream or a cheater... and I have neither.

 

[mnetwork]

my thoughts exactly. And why doesn't mine have a downstream o2? You can't run OBDII without a downstream or a cheater... and I have neither.

You don't have an after-cat o2 sensor?

 

[silvermitsu10]

nope. Never did. I have know the original owner and the second owner of the car and I have been working on it here and there throughout the years. It has never had one.

 

[mnetwork]

Anyone else know about this?????

 

[ekanddsm]

What is the emission level on your 2g's?

Is it California/New York or Federal Emission level?

And who is trying to tell me richer than 14.7 could hydrolock an engine.

I must of been asleep.

 

[linksys42]

What is the emission level on your 2g's?

Is it California/New York or Federal Emission level?

And who is trying to tell me richer than 14.7 could hydrolock an engine.

I must of been asleep.

Richer than 14.7 isn’t going to hydro lock you engine. Running rich for a long period of time will wash the cylinder/rings and lower your compression.