EGTs on the new engine at the end of the manifolds before the turbo(way before )are looking like:
800-900 at idle
1000-1200 part throttle
up to 1400 so far on about 5psi

After some part throttle driving at night the back half of the manifolds have a glow to them. The A/F is in the low 12's at wot and high 14s at idle, so the tune is close but small adjustments are still needed. Just wandering what other people are seeing at the manifolds/headers, and what is considered to high.

Some specs:
355 Forged
Stock heads
SS valves
224/220 502 513 114lsa

 

Not sure what other engines run, but turbo buicks usually aim for EGTs in the 1450-1500* range. Usually when they start to hit 1600, it indicates a lean mixture and more fuel is needed (more pressure or longer duty cyles). But different cars like different temps, so you mainly just have to balance your knock threshold with your EGTs. I never hooked a gauge up to mine, but my neighbor has one in his GN... he tunes his car exclusively by it. He makes fuel and timing adjustments solely to keep his temps at 1550*. Works great and never blew and engine tuning like this.

 

Just had me wandering because of the glowing manifolds(at night) after normal driving. The GNs you are talking about, are the temps taken at the outlet of the turbo or the manifolds.

 

Most are mounted near where the O2 sensor is, which is right in the header before the turbo.

Makes me wonder why you're getting glowing manifolds too

 

I tuned a TT IROC to stay around 1100-1200*. Looks like you're fat down low and going pretty lean up high. That will contribute to your glow-in-the-dark manifolds.

 

When I was tuning my old GSX it was usually 1400-1500 was best, 1600 was boom time.

Even after a good few runs at 1500 degrees though the manifold usually wasnt glowing too bad - but the turbine housing was a candle!

My cousin shoots for the 1450 mark on his GN I do believe...

Edit: But larger motors and different motors like other things, as was said.

 

Thanks for the feedback.
In a little more detail. When I start the car within a minute its up to about 800, and usually around 900. It is in the 13s AF open loop start up, and when it enters closed loop AF is around 14.7 850-900 degrees. I have tried lowering base timing at idle and upping base timing and not much change (egt went up when I set timing to only 5 degrees at idle). When driving around part throttle, i.e., closed loop, the pcm is keeping around 14.7 and temp is in the 1100-1200 range. 1200 seems to be when I hit the wot tables (wot at around 60% trottle) but still on vacuum and see high 12s-13s AF nothing lower. Changes on main spark adv tables haven't shown much of a change on part throttle temps. Around 1000 on the egt guage after driving at night is when i notice the glowing. 1400 is when i get on boost. I guess i will chalk this up as pretty much normal for this application.

 

Tuning has helped some, but the temps are still in the range listed above. Some research tells me this is about right. FYI: referencing thermodynamics cast iron glows at 900F.