Cat converter option

[Robottrainer]

So true . I'm more worried about the noise. They enforce zero tolerance policy on that.

The noise might be a problem

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[Robottrainer]

The noise might be a problem

And it doesn't address the problem engmike described. Doesnt really affect a wide open drag car, but the extra rich mixture street driving is not a good thing.

 

[engineermike]

Right. And in real world applications not having the narrowband amounts to, from everything I've read, basically nothing when it come to performance or reliability.

If you disable the CEL and FAOSC, you lose some front/wideband o2 sensor accuracy. I’m not sure how much and I haven’t seen it quantified, but many seem to think it’s negligible. The other downside is that with either of those switched off in the tune, you perpetually remain in “not ready” status which equates to failed emissions check pretty much anywhere they plug in to the obd port as part of the test.

IF it did, then FORD would most definitely have the CEL triggered / power reduction mode like a lot of other manufactures do, no ?

In the factory tune, gutting the cats will result in p0420/430 and it will disable FAOSC automatically. I’m not sure what all the other manufacturers do and the reasons why, but I do know that the use of factory widebands and closed loop at wot isn’t as common outside of ford, so maybe that’s a clue.

 

[engineermike]

Just to confuse everyone more, I had my car on the dyno a while back with 3” cat deletes commanding .78 lambda. I swapped in a pair of gt500 cats on the dyno, richened it up a bit to control exhaust temp, and made another pull. To our surprise, it gained about 15 hp with cats. We thought it was a fluke so did another pull and it repeated. After reviewing the log, the fuel flow didn’t really change (neither did the airflow, but that’s another topic) due to either blow-through effects or FAOSC, so this more-or-less isolated the exhaust dynamics as the reason for the change in power.

 

[WildHorse]

but the extra rich mixture street driving is not a good thing.

It won't be 'extra rich' in normal street driving.

 

[GregO]

I swapped in a pair of gt500 cats on the dyno, richened it up a bit to control exhaust temp, and made another pull. To our surprise, it gained about 15 hp with cats.

It would be fun to see some CFD models of the header to mid connect using stock cat, GT500 cat, No cat.
I’ve always been curious to see what is actually happening to exhaust flow pre and post cat.

 

[engineermike]

I have CFD software but you’re talking about a few days to a few weeks of modeling.

 

[GregO]

I have CFD software but you’re talking about a few days to a few weeks of modeling.

Right.
I’m sure there’s something published in some SAE papers. Just wouldn’t be specific to the Coyote.

 

[Robottrainer]

GESI is “local” for us.

G-SPORT EMISSIONS SYSTEMS IS A DIVISIONS OF:
GLOBAL EMISSIONS SYSTEMS INC.
1680 MCEWEN DR., WHITBY, ON, L1N 0A2, CANADA
TF: 1.866.539.5080 P: 905.433.9640 F:905.433.8773

Being in Ontario as well, I agree the emissions testing was a farce.

Not sure where you are in Canada, but the police are out there and do A LOT of “sniffing” and checking in Ontario. It’s nothing for them to hand out big fines. They’re cracking down on anything car related.

I'm in Ontario. Had no idea GESI was in Ontario.

 

[Robottrainer]

It won't be 'extra rich' in normal street driving.

Mike is reporting a 10% error. That's significant.

 

[Robottrainer]

I'm in Ontario. Had no idea GESI was in Ontario.

If the car is too loud they and or smells wonky they will stop you around here

 

[WildHorse]

Mike is reporting a 10% error. That's significant.

Well all I can say is look at the pic I posted. I check my logs religiously, I don't see anything unusual.

 

[K4fxd]

The Mak Perf is roughly 3k plus you need to have the flange welded onto the header. They didn't make it easy for us

The easiest way is to get a gen1 driver side header. They have a flange. Then all you need to do is have a shop cut off the flange on the MAK pipe and re-clock it for the new manifold.

Welding the flange to the original header really needs to be done off the car by a real welding shop. Stainless will eventually crack if not welded properly.

 

[K4fxd]

Well all I can say is look at the pic I posted. I check my logs religiously, I don't see anything unusual.

He is saying the widebands are reporting wrong info to the ECU. It looks like it is correct but is not. To test you would have to add a stand alone wideband sensor to check it.

Easiest way is to get a dyno pull and have them put a sniffer in the tail pipe to check lambda.

 

[GregO]

GESI catalytic converters are not manufactured by GESI. They outsource the manufacturing.

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