Egt

Iam Broke · Jan 23, 2010

The EGT values reported by the ECU are calculated I'm told, but I went catless because tuned I saw temps in excess of 1850*f logged in HP Tuners during a hard 4th gear pull at ~22 psi boost. Even if they aren't close to real values, they scared me. This is with the Cat Protection off so it didn't go very rich (.71 lambda) during the pull. I run .88 lambda WOT.

I had a ZZP catted DP on it, but thought it'd become a solid mass at some point.

ff_drift_lol · Jan 23, 2010

errr...i do stoichiometric could you convert the lambda for me lol

Iam Broke · Jan 23, 2010

14.7 X Lambda = AFR,

Stoich = 1.0 Lambda

.88 X 14.7 = 12.94 AFR

Stock Lambda is leaner than that by a long shot in the midrange and cruise is 1.0 Lambda or 14.7 AFR.

HTH

ff_drift_lol · Jan 24, 2010

cool, i never looked that up. good to know.

1WhiteSSTC · Jan 24, 2010

Iam Broke said:
The EGT values reported by the ECU are calculated I'm told, but I went catless because tuned I saw temps in excess of 1850*f logged in HP Tuners during a hard 4th gear pull at ~22 psi boost. Even if they aren't close to real values, they scared me. This is with the Cat Protection off so it didn't go very rich (.71 lambda) during the pull. I run .88 lambda WOT.

I had a ZZP catted DP on it, but thought it'd become a solid mass at some point.

so what your saying is that you'd absolutely recommend a catless DP vs catted if the person is going to tune/upgrade?

---------- Post added at 11:10 AM ---------- Previous post was at 11:09 AM ----------

ff_drift_lol said:
cool, i never looked that up. good to know.

see that's why I convinced him to come here

we need guys with this kinda info on here

Iam Broke · Jan 24, 2010

1WhiteSSTC said:
so what your saying is that you'd absolutely recommend a catless DP vs catted if the person is going to tune/upgrade?

If you don't have emission testing where you live, or if you are willing to put the cat back on when needed, yes. Most aftermarket cats are good for 1800 - 1850*f EGT's depending on construction materials. Like I said, I don't know how close the estimates from the ECU are, but the catless DP flows better anyway.

ff_drift_lol · Jan 24, 2010

catless dp sounds like d cups

YelloEye · Jan 24, 2010

ff_drift_lol said:
catless dp sounds like d cups

que?

Egt

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