Cats
Drifting
Joined: Aug 2008
Posts: 1,399
Likes: 30
But surely there's a reason for that.
Is it because engine builders tend to go with rather high compression which indirectly means quite small ignition advance at WOT?
It can't be just because of F/I, since LS9 can live with boost, as well as so many other engines with turbos.
Is it because engine builders tend to go with rather high compression which indirectly means quite small ignition advance at WOT?
It can't be just because of F/I, since LS9 can live with boost, as well as so many other engines with turbos.
Drifting
Joined: Aug 2008
Posts: 1,399
Likes: 30
It depends on what the ECU is using for stoich AFR for PE and you have to factor in stock OEM cats vs. high-flow aftermarket ones.
"Any condition that causes abnormally high levels of unburned hydrocarbons — raw or partially burnt fuel — to reach the converter will tend to significantly elevate its temperature, bringing the risk of a meltdown of the substrate and resultant catalytic deactivation and severe exhaust restriction."
"Any condition that causes abnormally high levels of unburned hydrocarbons — raw or partially burnt fuel — to reach the converter will tend to significantly elevate its temperature, bringing the risk of a meltdown of the substrate and resultant catalytic deactivation and severe exhaust restriction."
Melting Slicks
Joined: Jul 2005
Posts: 2,586
Likes: 2
From: Bardstown Kentucky
Stoich will still be 14.6:1 but you will have a boost enrichment table that will divide that amount by a certain number and command a different AFR. The table shown above appears to be like a 10.50:1 commanded AFR in the higher RPM's. The table shown above is referencing a Power Enrichment table though. A 2 bar tune will normally use a Boost enrichment table to command AFR under boost conditions.
Burning Brakes
Joined: Oct 2005
Posts: 1,089
Likes: 82
From: Kauhava, Finland
Stoich will still be 14.6:1 but you will have a boost enrichment table that will divide that amount by a certain number and command a different AFR. The table shown above appears to be like a 10.50:1 commanded AFR in the higher RPM's. The table shown above is referencing a Power Enrichment table though. A 2 bar tune will normally use a Boost enrichment table to command AFR under boost conditions.
Anyway, it seems that rich condition on ZR1 is pretty similar compared to what you get with any aftermarket supercharger or turbo kit.
Some say (one particular Chris) that do not trust BE with C5. Dunno with C6 though.
Former Vendor
Joined: Jul 2010
Posts: 4,504
Likes: 4
From: Waterloo Ontario
But surely there's a reason for that.
Is it because engine builders tend to go with rather high compression which indirectly means quite small ignition advance at WOT?
It can't be just because of F/I, since LS9 can live with boost, as well as so many other engines with turbos.
Is it because engine builders tend to go with rather high compression which indirectly means quite small ignition advance at WOT?
It can't be just because of F/I, since LS9 can live with boost, as well as so many other engines with turbos.
The Metal Matrix style cats-which are not used by the factory-end up plugging the system as they start to roll over.
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