Manifold Glow

[gotRICE?]

As the title states, i have noticed lately that after cruising at normal speeds the manifold and the 10mm spacer are glowing orange.

I know that this happens regularly under under harsh conditions, but i would have thought cruise at motorway speeds wouldnt make it happen.

Its an RB25DET in an R33, GT3076R on stock manifold, and the weekend just gone i re-installed the factory heat shield, trimmed to clear the compressor housing. And it was after this i noticed it.

Its not something you see during the day, just at night. Does it happen to anyone else?

The tune is spot on. Cruises at 14.7 or there abouts.

Anyway have included a picture. Sorry its crap, my camera is atrocious

It was taken on "Night Shot" hence being bright, but in reality its pretty dark in there haha.

But you can see that its only the spacer and the collector area of the manifold.

This was after a 20min cruise @ 100km/h. No boost. (maybe 1-2psi here and there moving off from lights)

Im guessing its not too much of a concern as the turbo itself isnt glowing at all. Possibly its a different kind of steel used for the spacer?

Any thoughts and opinions is appreciated.

Edited September 20, 2011 by gotRICE?

[GTSBoy]

ECU? Ignition timing numbers?

[gotRICE?]

Ah yes, my bad. ECu is a Link G4, and the ignition numbers are pretty conservative. Its only been road tuned so havnt dialed much into it at all.

In the 60-80kpa area where it sits during cruise at that speeds, the timing is around 19.1degrees @ 60kpa and 17.7@80kpa

[zebra]

Shouldnt be glowing like that just crusing on the highway, as above what are your timing figures?

Edit - 19 is no where near enough, Paul33 runs near 50deg I ran around 40-45 at low revs light load.

The more retarded the timing the hotter the EGT's which is causing your glowing manifold

[kitto]

Yep, ignition timing is far far too retarded.

[wolverine]

More ignition advance to stop combustion going out the exhaust.

Do you run a cat and if so how is it looking?

[JonnoHR31]

yep, needs atleast another 15-20 degrees under light load.

[gotRICE?]

Awesome, thanks alot guys. Something that was clearly missed. Probably just overlooked it. Have only played around a little bit with light load since the new turbo.

Dont run a cat. So no issues there. I guess this could also explain the cannon ball like explosions coming out the tailpipe when i do give it a squirt.

[GTSBoy]

Yup, hence why I asked. If your mixtures weren't wrong, then it was a fair bet that you were retarded. How does it feel to be so retarded?

Edited September 20, 2011 by GTSBoy

[gotRICE?]

A Herp a derp derp hurr?

[The Mafia]

Another +1 here for not enough timing on cruise. Minimum of 40 degrees. Don't go to much more though, doesn't really do anything. But what they said, combustion is well and truly over by the time the exhaust valve opens.

Also, leaving it like this means you run the risk of burning out exhaust valves. Don't want that, it will be an expensive repair.

[gotRICE?]

Yeah i know haha.

Diagnosed why it happened. The night after installing the turbo, and before initial fire up we hit the Rum hard.. next morning was fuelled by V and butter chicken pies. Too much concentrating on making sure the full load stuff was sotred out hahaha. Lesson learned.

[paulr33]

dont do 50deg based on my car

its too much timing

40deg is plenty on light cruise