Hi All

I'm fairly new to the Forum and i bought a used, local RX7 here in Switzerland at the beginning of May.

We had to do some basic work to prepare it for the bi-yearly test to keep the car on the road, however i have the major problem that i'm failing the emission test hard time.

We added freshly a used Pre-Cat and the Air Pump (both were missing) and we verified that the Lambda sensor is working.

The Car is running a Power FC and i got the COmmander with it. After watching the Lambda values on the tester we saw that it's running to thick (Lambda value is around 0.9v instead of the usual 0.97 - 1.03)

The mechanic we had investigating the emission test mentioned, that the car was likely running higher boost, so the overall Fuel that is being injected is higher to have the added fuel "cooling down" the whole engine. Sounds reasonable, dunno if that works that way.

Nevertheless since i didn't get a Stock ECU i can't check if the parameters are causing this issue, but i'd like if possible to compare the values i can see on the commander with some base values, and maybe adapt it even for a try.

I'm aware that i could kill the engine by changing parameters, yet i'm not planning to drive around wildly with it, i just want to get the emissions down when revving up to 2'500 rpm.

So the question would be, does someone have some kind of a map or some indicators that i could read into or use to check those parameters and at least see if the parameters are somewhat odd?

Thanks
Map

 

I have compared the earliest PFC map to the current, mainly only timing changes.
If the car is stock or near stock now, you might need to initialize it because it might have non stock mods to it.

 

What is the test procedure, is it a Idle test only, or is it done on a dyno at a specific load and RPM?

What are the actual test readings? I expect they are looking at HC, and CO. Do they also test for NOx?

It's likely that, unless it has significant mechanical modifications like bridgeporting, etc that it should be able to be tuned to pass the test.

For instance there is no reason to run really rich at moderate loads like would be found when you are just cruising.

 

Hi All

THanks for your answers so far.

@cewry7r1 how can i initialize a base map? (i don't have the FC Datalogit)
@Vicoor They compare CO / CO2 / HC values, we were testing @idle (cold start ~1800rpm, after a while it goes down to ~1200)

Since it's a 94 they require to have the EURO1 norm passed, which i belief is something like CO = 0.5 and HC = 100 if i'm not completely mistaken

When they were testing the values, i got something like CO = 6.0 and HC = 1000. After the Air Pump was mounted, the CO value went down to around 4.5 but HC remained on the high lvl.
As mentioned earlier the Lambda voltage is at around 0.9 only (measured with multimeter) so we assume the map was adapted to run higher load, hence more fuel.

The car runs currently completely stock, had to mount the pre-Cat again since they were complaining it was missing. Will be removed again and replaced with a HKS Downpipe as soon as all the tests have been passed successfully.

Thanks
Map

 

Use the Commander and follow the instructions in the PFC manual.
Easy to initialize the PFC.

Is O2 feedback turned on? Has to be for the air pump to work correctly.

The initialize will fix all of that.

 

I'm not specifically familiar with the PFC, but it's clear you have a tune issue. No load/Idle emissions test are generally harder to pass than a dyno test like we have here.
There's really no good reason to run that rich with no load on the engine, you should be able to tune that out without much problem

 

O2 Feedback is turned on (ari).
I'll check if i have the manual somewhere, tbh never checked this myself :/

Will try to do that either today or tomorrow as i have the car over at a local store at the moment

Will let you know the outcome as soon as i was able to test this

 

As far as i can understand (after browsing through the Manual) it seems that especially on the Fuel correction map something is odd.

If i understand the values correctly, e.g. P01 and N01, the cell is telling you how much fuel to inject. The base value according to the Manual is 121 (1214), yet on the photo i took of that map it says 123, so clearly more fuel in low RPM range. But on N02 P01 (higher rpm) it gets lower than the stock (120 instead of 121).

Guess the previous owner or whoever changed the mapping there just somewhat screwed it up.

Attache some photos i took from the Commander on Thursday when i was trying to get some information. Now i could slap myself for not thinking about the manual, as i had 2 days off to investigate yet didn't come up with something so simple ^^

 

Some of those values are stock and some are not.

Even the stock base map that comes on the PFC has IGT split errors in it.

You really need a DATALOGIT to properly tune or take care of a FD PFC.