E38 LS7 exhaust gas temps on idle?

[Age08]

Does this sound right for exhaust temps on idle which are around 360-400c with the engine @ 90c?
the motor is a LS7 with heads milled 20' and a cam with .649In/.660Ex lift, 227/243 duration and lsa 115,
Air fuel on idle is 14.5-14.7, with timing hunting around 15-20.

[joecar]

How are you measuring...?

[Age08]

How are you measuring...?

I am using a Egt probe installed on the number 2 cylinder exhaust port.

[joecar]

Those temps are ok for warm idle.

What do they hit at WOT...?

[Age08]

When I get a chance today I data log it,
Also I was little out on the temps it's actually 525c not 400c on idle, I calculated wrong from Fahrenheit,
Now the probe is right on the main against the exhuast port of that makes a difference

[joecar]

Are you running catalytic converters...?

The key is this:
- at idle you want barely enough temperature to keep the cats lit (something like 400-600*F).
- at WOT/load you want to be below the catalyst danger threshold (about 1200* F or under).

[Age08]

I am running cats,

[Age08]

Here a log I did while driving steady at 100kmh, its has a short wot burst never the end,

[joecar]

I think you're ok... I see COTP kicking in briefly, this is normal after a WOT pull.

[joecar]

BTW: for E38 log GM.ETCTP instead of GM.ETC, and log GM.HO2Sxx instead of O2Sxx.

[Age08]

thanks