exhaust manifold getting hot and glowing red - Nissan 240SX Forums
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#1 Old 10-14-2010, 01:20 PM
 
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exhaust manifold getting hot and glowing red

idk if this has anything to do with the tune but even when i drive the car easy if its dark enough outside, the exhaust manifold is glowing red. im not even bringing the car into boost and it still gets hot idk what it is?
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#2 Old 10-14-2010, 05:25 PM
 
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usually its due to a lean condition, but depending who tuned your car it could be within spec.
i would check your A/F ratio while driving or on a dyno.
my gets hot enogh to read a book on but like i said its all about tuning.

hope this helps
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#3 Old 10-14-2010, 05:28 PM
 
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It's also about what brand and how thick the metal is/what it's made of...but tuning plays a big role too.

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#4 Old 10-14-2010, 06:50 PM
 
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My sure you are checking your AFR's. Your tune could be set to be waaayy to rich, causing much hotter exhaust temperatures, or it could be set lean. Which can cause a similar effect. If you are IN boost and your AFR's are above 12, I would say you need to richen it up. If they are below like 11 if not 11.3, then you need to lean it out.

Find out if it is running lean or rich and let us know whats going on.

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#5 Old 10-14-2010, 09:47 PM
 
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#6 Old 10-14-2010, 09:56 PM
 
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i would also go with the header type and thickness. for bets results paint them black



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#7 Old 10-15-2010, 08:18 AM
 
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Can always wrap and use the black sealant. Works like a charm

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#8 Old 10-15-2010, 12:39 PM
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Retarded timing has a big effect on heat within the exhaust manifold as well.

@BoostinIX. You have wrapped your manifold? I'm thinking about doing that. You used the Silicon spray? Is that necessary or is it just an enhancement?

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#9 Old 10-15-2010, 04:02 PM
 
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I've wrapped downpipes, but I mean it's the same thing. Metal pipe. Manifolds are just more of a PITA. I liked Sleepy_Steves method of using RTV to hold the ends in place/prevent unwrapping. It's ugly, but under spray, who will notice.

Now, the silicon spray does help, yes. It's another barrier, but it also protects and prolong the life of the wrap. The downside- your wrap you wet to install has to be dry, and pulling a mani back off is a pain in the ass. Solution? Same as with the downpipe. Set it down after your wrap is wet and secure, i.e. done. Insert a heat gun in one end, and watch it cook. All that nasty cooking smell is gone before it hits the car, your wrap is cured, and you can go ahead and spray.

For the few bucks it costs, get the spray. If nothing else, it'll give the mani a nice coat. If looks worry you after, can always use the 2k+ degree paint (think its 2k, its something stupidly high, vs the engine paint that's 700.)

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#10 Old 10-15-2010, 09:21 PM
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Hmmm.. So you wet the wrap first with the spray, then let is dry, then wrap it? I feel like I'm missing something.

I plan on using metal straps to hold the wrap at each end. Do I wrap it first then spray it, or spray it then wrap it. Obviously I'm confused.

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#11 Old 10-16-2010, 10:50 PM
 
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Haha it happens. IIRC, it comes with instructions, and plenty online.

I'd be concerned the metal clamps won't hold with the header expanding/compressing. Slipping is bound to happen.

You wet your wrap. Makes it stick, and more workable.
Wrap your part.
It dries.
Heat it (takes a while, will smoke and smell godawful), so it cures in place.
Spray the DEI silicon sealant over the wrap.
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#12 Old 10-17-2010, 01:06 AM
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ah. Thanks for the quick instructions.

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#13 Old 10-17-2010, 01:02 PM
 
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i have a aem wideband and the a/f is too rich when i give it half throttle or more it just pegs to 10 on the gauge and falls on its face. i also have the stock exhaust manifold and a 3in. exhaust with no cat.
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#14 Old 10-17-2010, 02:22 PM
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^ Yeah that's too rich. Do you have any way of leaning it out, or advancing the timing? Just FYI, I shoot for an equivalent 12.5 AFR on 6.5 psi. At 11 psi, I'll shoot for 12.0

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#15 Old 10-17-2010, 06:28 PM
 
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^ Yeah that's too rich. Do you have any way of leaning it out, or advancing the timing? Just FYI, I shoot for an equivalent 12.5 AFR on 6.5 psi. At 11 psi, I'll shoot for 12.0
i have a SAFC 2 and ive played with it and kept the a/f in the 12's and it still is glowing
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