This just started happening one day and has not gone away. Under any load condition my header will glow. At first I thought it was the ignition because I had a bad magnetic pickup in the distributor, replaced the distibutor an redid all my electircal connections. Ive tried everything that I can think of that would relate to this problem. My air/fuels are around 11.5/12 when cruising. Me and FBII are out of ideas, any suggestions.

My setup:
Renes tubular manifold
S4 TII turbo
MSD fuel injection pump
Aeromotive 1:1 RRFPR
FBII's boost prepped Nikki
MSD 6a w/ Accel Super Coil
Accel 8mm wires

 

What do you have for exhaust... Could there be a clogged cat? Only other thing is could be is fuel or timing as far as I know


Good luck!

 

11.5 is a little lean is it not? 14.7:1 is perfect A/F .........

ok my bad i know this is ^ wrong it would be rich not lean im still trying to get my foot out of my mouth

 

I think thats too rich. You might be burning the excess gas in the exhaust.

 

yea, arent you using the rb exaust? maybe theres nt enough flow from that....

 

how is 11.5 to rich? if anything its lean and running lean creates alot of heat witch would make his tubular manifold start to glow

^^^ again i was still thinking backwards sorry sand121 thanks for pointing out my mistake

 

11.5 parts of air to 1 part of gas is richer that 14 parts of air to 1 part of gas

 

The graph below illustrates a few key points. First, the concept of stoichiometric mixture...that is the point where, chemically, there are exactly enough atoms of oxygen to burn 100% of the fuel. This point is at an air-fuel ratio of 14.7:1. If you have more air with same amount of fuel you have a lean mixture, less air than stoichiometric is a rich mixture. As you can see from the graph, maximum power is produced with a slightly rich mixture (12.6:1) and maximum economy with a slightly lean mixture.

 

yea sorry lol was thinking backwards err

takes the time to take foot out of mouth

 

How much ignition timing?

 

Here look at this thread https://www.rx7club.com/showthread.p...lowing+headers

 

If you have thin wall headers they will glow with heat, its no problem if the walls dont collapse, but they wont last as long as thick walled headers

 

he basically has the same turbo setup as me. 10 degrees advance. nothing has changed, just all of a sudden his header started glowing all the time. those afr's are fine.. it's a turbo setup

mine does not glow and i'm not sure where to look anymore. ignition is on par, msd is rockin out, new distributor, cap, etc... fuel is there, timing same as mine, we're lost.

it never did this before till recently. we're going to change plugs and try a different gap next. so we'll see.

 

Yea, ignition is set to 10 degrees advanced, which is where its been this entire time. I am running a modified TII downpipe that couples to the RB mid section, but no muffler section, so its a strait through with no restrictions. Im lost as far as what it could be, the only thing thats changed is when I changed the plugs last we gapped at .020 instead of .014, but that shouldnt matter, but im going to try it cause I have nothing left to check.

 

Check everything out,timing,mixture and such....but if it still glows,I wouldnt worry too much.
My TII hybrid had always glowed.Stock primary injectors,stock timing,stock ECU,passes smog,ect,ect,ect.It is streetported,which could introduce a little more fuel to the exhaust stream.
For the last 4 years it has glowed a dull red around the turbine housing and the front of the cat glows a tad brighter.......Hell,even the inner pipes of my RB muffler are a very dull red when you look at them in the pitch dark, and thats all the way back at the rear of the car!

 

A turbo rotary is a hot exhaust, I don't see the problem, my BP 13b used to glow when I raced it hard, never became an issue, just keep your hands off it, and keep your intake air cool.

 

I know rotary exhaust is hot, but this is not normal. It has never done this. Me and FBII go out every weekend and give these cars hell and the headers never have heated up like this. Even when I had them wrapped they would never glow. I guess the things Im most worried about is the tubular header cracking and that much heat is making the turbo glow bright *** red. I dont want to damage the header or the turbo. Ill keep looking

 

why dont you try richening up the mix and playing with the timing to get it to stop glowing.

U tried cleaning out the fuel system/changed filters etc etc

My car glows cherry red after giving it some hell. Just put a heat shield over the snail and make sure you cool it down before switching off

-James

 

what boost are you running? and where are you testing afr? at the tailpipe or near the turbo?

 

the wideband sensor is near the turbo, it's fine there. no need to richen the mix up any more than it already is. if the plugs don't do it then i'm going to mess with his timing.

 

What are your EGT's?

If you don't have an EGT Gauge - Get one. It's important.

 

yes EGT's are a great "tell-all " of the tune, i agree completely. we do not have an egt gauge on his car yet.

alex, would you suggest putting the probe in the downpipe or one of the runners of the manifold? i know on piston cars here we always put egt probes in the manifolds, but i'd like to get your input on this.

 

there are only a very few things left you could try. Does the header heat up evenly? Could it be possible that the heat is coming from one rotor? like maybe having fuel delivery problems to that rotor. That's a hell of a long shot though. And if it isn't the timing, then it has got to be that it needs to be richened up more. There is one other thing i've heard of, but it was another very rare occassion, is if it is running too rich and there was a crack like say on the bottom side of the header, where it was actually getting a good burn from the excess fuel...but i highly doubt that also. Anyways...just some spitball ideas, while i'm killin' time. Good luck

 

Or how little. That would be my guess.

 

I seem to think I have found the problem though it doesnt make sense. I still have to think about it. But I put my old plugs back in that are gapped to .014 and drove it around tonite and no glow. The brand new plugs that I had in there were gapped to .020 which is what FBII uses. It could of been a mix between the wrong gap and maybe a bad plug. BoostedHulk, I have thought about the idea of just one rotor running lean. Still am gonna play with the timing a little and I need to get a compression test as FBII's headers glowed right before he lost his first motor.