spent 3 hours not knowing what i was doing on my mates mot gas annilizer,could not get it to pass.
i was playing around with the 0%and 2%throttle position and puting the fuel down to figures like -35% with the revs1000 up to 3200.
got the co or was it co2 down but the lamda was not good staying at red.
the engine is a 07 year zx10 with 421 exhaust,in line cat then r1 backbox and pipercross sponge filter.
can anyone help,sva on wednesday.
p.s why are the readings so far away from when in the bike.

Is the throttle position sensor set at zero

The readings will be far away from what they were in the bike, as you have a completely different inlet and exhaust system, hence a different amount of air will flow through the engine at any set point (changing the a/f ratio). Have you got a/f readings from your testing (you say 'at red' )?

Best bet might be to set all of the target A/F ratios in that area to something like 13, then play with the mixtures until the analyzer matches the target. From there, you can tweak to what you need to pass....

[Edited on 16/1/09 by twybrow]

on the lap top the power commander software screen the throttle position said -1% at idle.
when i say red i mean the figures of the test for the lamda are in red on the screen of the gas analiser.

Would be good to know if the lambda was low (rich) or high (lean)

Need to know what the CO, HC and lambda readings were in order to make any surgestions.

adrian

I think CO was highlighted in green at 0.02 I think the pass for this was 0.2 as for the lambda I think I was in the red at variants between 1.35 and 1.85 I think the pass for the lambda was about 1.20 or thereabouts

Pass on the lambda is between 0.97 and 1.03. Yours is reading weak. Either you've got an air leak on the exhaust or your running too lean.

Once the cats up to temp (takes longer than you'd think holding rev's in the workshop) it'll bring the CO down from quite high to required levels (you'll see them drop quickly when it starts to work).

Assuming no air leak...Going down to -35 on the fueling is just making it worse. Go the other way. My R1 needed +18 right across 2000-3000revs at 0 and 2% throttle to pass.


adrian

adrian that would make some sence as reducing the percentage of the fuel from say -30 to -40 did seem to make the lambda worse.
with what i could see today was that i managed to take off alot of co by reducing the fuel to -30/-35 but i think to much affecting a worse reading on the lambda.

Once the cat is up to temp (just under 500'c) then it'll bring the CO down from up to 0.5% (maybe more) pre cat to 0.0 post cat. You really need to hold high revs for a long time to get the heat into it. It'll be hot enough to melt the testers probe.

If you've got 0.2%C0 and a weak Lambda then it sounds like the cats not fully hot.

adrian

the engine was always warm reading 90+ with the fan coming on.

Not about the engine being warm; it's getting the cat VERY hot thats the problem. It can take 20min on the road driving hard to do that. In the workshop, you have to rev the knackers off it for a long time. Once it hits temp' then the readings suddenly drop. Its not a gradual fall as the cat simply doesn't work then hits 480' and it does. Just running won't light it up.

adrian