Tuning MSnS-E for smog on a b230F+T

[Magnum TE]

I'm up for a smog, and I never got around to making a smog map for the car. it's a 94 B230FD+T

What are your recommendations for target AFRs, and how should I set ign timing, what about accel enrichment. It's a smog II so I've got to get up on the rollers.

Any help with making a good "Clean" tune would be great.

[745 TurboGreasel]

Time at factory spec, maybe a degree retarded. You fail if it is more than 3 off.
Set idle just below where EGR can come on if it doesn't idle real smooth. i think 949 RPM is max allowable.
make sure the car is already good and warm when they start the test.

That's all I have to offer from the smog tech angle.
If it were me, i'd probably go to a pass or no pay shop and see what happened. if possible, video their instrument as the test is done.

[Magnum TE]

mm yeah i will set base timing at 12 deg, however I don't know what the stock ign map is at say 100kpa and 2200 rpm etc...

I'll see about no pass no pay... boy will they love me

[745 TurboGreasel]

At least they have no conflict of interest telling em to fail you.

[crazy0000]

I had the privilege of running a test run, which actually almost passed right then. I had a brand new high flow cat on. some settings were a little high, went to the test area of the map, lowered the afrs, backed off the timing, and bingo passed.

The test for our cars is, an idle test, then a 2500rpm test on a dyno.

[Magnum TE]

I had the privilege of running a test run, which actually almost passed right then. I had a brand new high flow cat on. some settings were a little high, went to the test area of the map, lowered the afrs, backed off the timing, and bingo passed.

The test for our cars is, an idle test, then a 2500rpm test on a dyno.

can you post up the AFRs and ign timing you used on that test? I've got a brand new cat ready to go into the car.

[Magnum TE]

So I know it's a 2 stage test, one at 2500 rpm like 15mph and one at 3000? at 30mph?

What I'm planning to do is have a 4500rpm rev limit and cluster most of my map points (ign and VE) around Idle 2k and 3k

It would still be nice to get an idea of the AFT targets I should be looking for? I'm guessing 15.5-16 ish is too lean going to be really bad?

It'd be nice to get some real world numbers from folks that have done this already.

[crazy0000]

Sorry, I kick myself everyday for it, but I didn't save my testing map. Thought I feel my improved map would probably pass, as long as you're not running crazy rich and your timing is normal, you should pass with a new cat.

[Magnum TE]

I'm trying for an AFR around 15.7 at idle and 15.5-16:1 at cruse (90 kpa) keeping lean of 14.9 across the board, going into 13:1 at 130kpa.

This is the map I'm working on, soft rev limit 5k, 5.5k hard limit. Boost cutout @170, MBC set for 145kpa.

http://i483.photobucket.com/albums/rr191/Magnumte/Volvo/MSnS-E/SMOGVE-Ignver1.jpg
http://i483.photobucket.com/albums/rr191/Magnumte/Volvo/MSnS-E/SMOGVE-Ignver1.jpg

What do u think of the clustering?

[linuxman51]

if you lean it out too much at cruise, it jacks with various things they check for. I would attempt to run it right at 15:1 cruising. I think its NOx that goes up when you run it really lean.

[wennstroma]

I would tune it for 14.7:1 afr. Thats the best balance for emmisions. Mine was around 15.5:1 last smog and the NOx climbs pretty fast when its that lean.

The California test is at 15 mph and 25mph on a dyno both around 1800-2200 rpm. The load on the dyno keeps the boost gauge at about 10" vacuum during the test. My car passed just fine with a carsound 3" cat.

[GTJordan]

NOx is what sky rockets when you lean it out.

Aim for 14.7 since that is theoretically where all fuel and all oxygen is being used up.

Jordan

[Magnum TE]

haha I knew if i posted over in P&S that more would come ^_^

Thanks for the advice guys, I will keep it 14.7:1-15:1 and see if I can squeek by the visual.

What do u guys think about my spark map?

[crazy0000]

The test is going to sit in a very specific bin, and probably not move from those two places. Also you will never hit boost. Might be able to get away with retarding a bit more where the test will be taken place, but I'm not 100% on that.

[qwkswede]

I got my car to pass by running very retarded ignition timing. The car would barely pull when I was done. But I ran through the dyno test about 6 or 8 times before it passed. I ran about 5 deg idle advance, and pulled about 5-10 degrees across the board from optimum performance settings.

I also had the fuel maps as close to 14.7 as possible during cruise. My car would run very clean everywhere except the transitions during accel and decel. With monster injectors its hard to get the accel enrich just right, and the decel enleanment is the same. I would be fine everywhere during the drive with a couple big spikes when speeding or slowing. I was able to fine tune it some, but that was the hardest part to tune. Its pretty easy to get the base map close enough by just street tuning. After barely failing a couple times, I retarded the timing ALOT, and it went through no problem.

The dyno test here they average a 1-2 minute drive at various loads and speeds.

[Magnum TE]

I ran about 5 deg idle advance, and pulled about 5-10 degrees across the board from optimum performance settings. .

So you think I should pull more timing out than this?

http://i483.photobucket.com/albums/rr191/Magnumte/Volvo/MSnS-E/SMOGVE-Ignver1.jpg
http://i483.photobucket.com/albums/rr191/Magnumte/Volvo/MSnS-E/SMOGVE-Ignver1.jpg

In cali they use a timing guy to check the idle base timing so I've got to keep that around 12-13

[qwkswede]

I thought most Volvos were 8-10 deg base timing at idle. There is probably a sticker somewhere. At least on the cars that have adjustable timing. Maybe not on LH2.4 cars.

We get 1 free re-test after a failure and making repairs. I don't know if you get any free runs to experiment. But if you do, try what you have there and see how it goes. I got pretty desperate, and lowering timing advance is an old fashioned way of making cars blow lower HC numbers. You could twist the distributor to retard timing everywhere and watch the HC levels drop. It worked for me with 70lb injectors.

[Magnum TE]

Lol I failed like crazy, I didn't realize the load the car would be under, my AFRs were all 13.5:1 :-( it's a bummer, I got dinged for the BOV, the oil catch can in the pcv system, and some other things.

Visual inspection = Tampered
I barely passed @ 25mph.
Failed at 15mph CO% Max = .72 / Measured = 1.79 / HC ppm max = 112 / measured = 106

I got to lean my **** out big time.

[qwkswede]

Yeah, you aren't that far away from passing. A little cleaning up of the AFRs should go a long way.