Exhaust manifold glowing hot! Why?
11-18-07, 04:08 AM
#1
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Exhaust manifold glowing hot! Why?
Hey guys, I have a new problem that I'm not really sure what to think of. My car has been down for a while as I had a turbo go out on me, and it was off at Precision for a rebuild. Well, got the turbo back, and got everything back on the car, and hooked up again. After getting everything together and all hooked up we let the car run, and idle. After about 5 minutes I noticed my exhaust manifold glowing hot. Now I just got my car off the dyno where it made 424whp @ 18psi on e85. So everything was freshly tuned and running well before the turbo failure. So I can't figure out why this would be happening now with no changes on my setup. Just seeing what kind of things you guys could suggest. No cat... so it can't be a cloged cat, and I don't know where to look from here.
*CLIFF NOTES*
-Freshly rebuilt turbo
-Manifold glowing hot
-Help me
*CLIFF NOTES*
-Freshly rebuilt turbo
-Manifold glowing hot
-Help me
11-18-07, 10:09 AM
#4
Will work for horsepower
If the trailing plugs dont fire it will put fuel in the header and fire by the leading plugs and it will glow like hell. But its probley a timeing issue.
11-18-07, 10:47 PM
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that's alot of what I have read, but what I don't understand is the car is fresh back from tuning, and nothing changed as the turbo was being redone. the manifold never got that hot before... just don't understand what would have changed. if my aem ignition failed on me would that cause these symptoms?
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11-21-07, 07:06 PM
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Hey its funny that mine does that too, i just noticed this last night when i open the hood at night time. I just recently got this whole set up put in and fire up and its only been 500 into breaking in. Well here's the story, i got this whole set up from this guy. Half Bridge, Single Turbo (turbonetics BB Turbo), Cheap OBX exhault mani, cheap Ebay Tial look alike Wastegate, cheap ebay Turbo XS BOV and Feul Pressure Reg. So i got this whole thing in the car now and i notice that the mani is red at idle at night because it easier to see and not only that but after 500 miles of breaking in, i tried to put some boost in just to see. Well i kinda step on the gas until about almost 4k rpm but only seeing about maybe 2-4psi is this normal, is it suppose to be this much lag with the bridge port but i have a BB turbo though.
Does anyone think that those cheap ebay stuff should be replace or that doesn't effect anything until it break. And by the way i bought my car to KDR performance here in PA and he said that my coils where on backward and he fixed it, so what else could be making this thing hot!!!???
Does anyone think that those cheap ebay stuff should be replace or that doesn't effect anything until it break. And by the way i bought my car to KDR performance here in PA and he said that my coils where on backward and he fixed it, so what else could be making this thing hot!!!???
11-24-07, 07:21 PM
#10
"Elusive, not deceptive!”
What you are seeing is, of course, the mixture still burning as it exits the housing.
Are both exhaust tube equally red?
Are they deep cherry or orange?
What timing, leading and trailing are you using in the idle range?
Barry
Are both exhaust tube equally red?
Are they deep cherry or orange?
What timing, leading and trailing are you using in the idle range?
Barry
02-06-09, 07:01 PM
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Did you ever find out if anything was causing this? I'm glad I got a watercooled turbo of I would be scared to turn it off till it stopped glowing...
02-08-09, 06:16 PM
#17
Savanna Rx-7
Yeah you either have a timing issue, or way too much fuel and it (excessive fuel) is burning in the header, or hotside of the turbine. neither of which is good.
do you have a wideband, and or EGT logger?
chances are your wideband will show it being too rich at cruise rpm's
or
your egt will show too high of an exhaust temp.
to explain it in a nutshell if you timing is to low, you will shoot unburned fuel into the exhasut manifold and the pipes will glow. and interestingly enoguh if your timing is too far advanced, the pipes and turbine will glow also.
so firtly get your afr's where they need to be if they are not already, next check your timing either with egt dataloggers, or by having a pro dyno and then road tune it
good luck
kenn
do you have a wideband, and or EGT logger?
chances are your wideband will show it being too rich at cruise rpm's
or
your egt will show too high of an exhaust temp.
to explain it in a nutshell if you timing is to low, you will shoot unburned fuel into the exhasut manifold and the pipes will glow. and interestingly enoguh if your timing is too far advanced, the pipes and turbine will glow also.
so firtly get your afr's where they need to be if they are not already, next check your timing either with egt dataloggers, or by having a pro dyno and then road tune it
good luck
kenn
02-09-09, 09:14 AM
#18
Honestly I'd like to know what you guys find for EGT's during cruise and what you think is too high/low.
The car I referenced before would run 1500F EGT's in vaccum crusing at 15:1AFR.
Never missed a beat (until a trigger issue blew it up at 18psi)
EVERY (single turbo) setup I've EVER had (on a rotary) has had a cherry turbine after driving around, spritied or not. If *apparently* this is a huge problem, then I'd like to know what you guys do to prevent this.
Personally - I think its just the way it is, but I'm no expert....
The car I referenced before would run 1500F EGT's in vaccum crusing at 15:1AFR.
Never missed a beat (until a trigger issue blew it up at 18psi)
EVERY (single turbo) setup I've EVER had (on a rotary) has had a cherry turbine after driving around, spritied or not. If *apparently* this is a huge problem, then I'd like to know what you guys do to prevent this.
Personally - I think its just the way it is, but I'm no expert....
02-09-09, 10:42 AM
#19
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well manifolds and turbine housings glowing, like a few people said, the timing can be way off(retarded) as i've experienced it before. now as for driving around town and them glowing doesn't happened to me. i had one car, well no two car that glowed red on the manifold and the manifolds were ss autochrome manifolds. i replaced them with custom made 2" runners and never seen manifold or turbine housing get red. one car makes 426hp on pump at 19psi on the other is on e85 untuned but beating the **** out of it and it doesn't glow. just my 2 cents no genius here.
02-09-09, 02:02 PM
#20
well manifolds and turbine housings glowing, like a few people said, the timing can be way off(retarded) as i've experienced it before. now as for driving around town and them glowing doesn't happened to me. i had one car, well no two car that glowed red on the manifold and the manifolds were ss autochrome manifolds. i replaced them with custom made 2" runners and never seen manifold or turbine housing get red. one car makes 426hp on pump at 19psi on the other is on e85 untuned but beating the **** out of it and it doesn't glow. just my 2 cents no genius here.
My manifold runners wouldn't glow, just the turbine housing/manifold's mating flange
Manifold was a greddy log.
EDIT: In vaccum/crusie I ran (at the time) in and around 30* advance, but there's no real solid numebr because of the range of the map. But from 20 to 30 roughly
2nd EDIT: The "glowing" i'm talking about isn't full on, blasting cherry red. In the daytime you can't see it. But at night, if I crusie around and pop the hood just after stopping, you'll see a little glow on the turbine. And to the above poster, I'm sure E85 makes a large difference in EGT's given the volume needing to be injected, and the alchol content. So an E85 fueled car wouldn't be a good apples to apples comparison.
The car did this with my own first tuning, after BDC had tuned it, and after I redid more things and tuned it myself post BDC. (and the 1500F EGT number I posted earlier is PRE TURBO! not post)
02-11-09, 03:23 AM
#21
Savanna Rx-7
Just to clarify
On My 1st gen: (to4E 60 trim with PFC and supporting mods) I have had my turbine housing and my manifold glowing red hot before, but it was while I was on the track. pulled over for a split oil line, shut off engine to save engine and when I popped the hood and the turbine hotside/intake manifold were both glowing.
My FD (TO4Z/HKS FCON SZ) has not glowed yet... mind you not much track time either, but who knows.
If I am correct the OP was reffering to idle/vacumn operation it was glowing.... thats normally a timing issue unless he has cat installed and its clogged.....
Kenn
My FD (TO4Z/HKS FCON SZ) has not glowed yet... mind you not much track time either, but who knows.
If I am correct the OP was reffering to idle/vacumn operation it was glowing.... thats normally a timing issue unless he has cat installed and its clogged.....
Kenn
Last edited by kenn_chan; 02-11-09 at 03:24 AM. Reason: spelling owns me
)
02-11-09, 11:08 AM
#23
BDC Motorsports
Ever read the EGT's while cruising down the highway in 5th gear whilst lean burning via an O2 Loop? They can get into the low 1500's pre-turbo. That's pretty hot. 
B
B
