Hi I'm new. That is normal my 8 blow off fire from exhaust ? Thanks for your answers I have 8 from yesterday and I'm all time worried something is not ok.

 

No it's not normal.

 

When I put gas to 9rpm put down to about 7 and again to 9 that blow short fire from exhaust. So I have problem? I try to take video tomorrow. **** yesterday I bought it.

 

 

Well if the car is not stock (gutted cat or aftermarket midpipe) then yeah it will shoot flames.

 

I was watched lot of vid on YouTube and lot of original shooting flames from exhaust

 

I take a vid witch sound of engine and flames maybe something is not ok or it is modded IAM 3rd owner so maybe, and the last owner take only 3000km for 3 years and he didn't know what is inside he only changed battery, sparks, cooling liquid, air filter, oil filter and oil. Yeah not him mechanic

 

I still have hope I didn't fucked up and loss my money

 

Generally speaking, they do not shoot flames with the stock cat intact. With an aftermarket car or no cat, they can shoot flames.

Shooting flames happens when hot, unburned fuel leaves the low oxygen area of the exhaust pipe, and meets the high oxygen area of the atmosphere at the tail pipes. RX-8s run relatively rich, so there can be unburned fuel in the exhaust stream under certain conditions.

 

So maybe all is ok yes?

 

No.
Do you have a check engine light? Is your catalytic converter healthy? If it was gutted at some point, the flames make sense. If it is not gutted, but broken, then you need to get that taken care of, or you're shopping for a new engine soon. So. Take the cat down and see if it is broken up and pieces are stuck inside, or if there is nothing inside at all.

 

My engine is 13b 231hp that's all I knew yet. Yesterday I changed oil and oil filter. When i come back to Pl i change it to original Mazda dexelia oil. Ow and another question cooling water the best is redline water wetter yes? But I don't know I can buy it in Poland

 

Yes yesterday I plug in a computer I have 1 issue lambda probe 1 (I don't know that is correct in english) that is responsible for air and fuel mix. I think and that is somewhere in exhaust or cat.

 

I think and that is somewhere in exhaust or cat

 

So better when I tow it to Pl and drive with my Volvo I don't want to take that risk. And then I have to spend some time with she and take care of

 

i am happy I asked for that before I go that trip

 

It looks exactly like this movie above

 

exactly so small

 

Do not use water wetter. Mazda FL22, nothing else unless you do the research.

So.. you're going to unbolt the catalytic converter and examine it, right?

Do you have the check engine code itself? lamba probe 1 could be a few different things.

Also be careful when you tow it, you can't pull it with rear wheels on the ground. Transmission isn't properly lubricated in that scenario.

 

First, it helps to not make many small posts in a row. Edit the same one until someone else replies. Easier to read that way.

Second, if you don't want to pull the cat off to physically examine it, there are some other ways that should work.

- Stand behind the car while it's idling. Is there a stench of unburnt gas(or a strong rotten eggs/sulfur smell)?

- Take it for a hard drive at night. After that, look under the car. Is the cat glowing?

- Does it have difficulty revving high?

The only way to know if you have an OEM cat or something else is to look at it while you are under the car. The Classified section should give you an idea what an OEM cat looks like.

As noted, OEM cat doesn't shoot flames.

Most cheap aftermarket cats won't last against rotary's heat, so if you have those, don't be surprised that you have a melted mess inside. The only aftermarket one that's worthwhile seems to be HJS tuning ones, which is expensive(you need to weld it to a mid-pipe) and hard to source nowadays in North America(HJS is in Germany).

Remember, if the cat is actually clogged, it will soon start to affect your engine. If that's the case and you don't have the money, just gut the cat for a temporary solution.

 

So I try to check it one more time to get code of that error. I have money, and that car is from Germany iam working here. Smells not like rotten eggs but yes I can feel gasoline when I stay behind the car. I have no problem to check this all, The company I work with has its own workshop. So I think next week I have some time to do an inspection and check all that thing's. A car going well I can say very well had no problem with reeving. Speed up normally with no problems to Max rpm's. When I was driving from place where I buy it I was driving 250km and that was not all but straight was ended, and I reached that speed so fast so I dunno. that is not a problem i have also my Volvo here so I don't drive with 8 that is better for her until I check it all. And how looks original cat. But when I gut the cat that is also not good for engine?

 

Sounds like you just don't have a cat then.

OEM one looks like this, although older ones can look a bit rusty:



Image from Mazmart

OEM cat does sacrifice performance a bit for a cleaner exhaust, but a properly working one doesn't harm the engine. I am just saying that most cheap cats and mid-pipes simply can't handle the heat a rotary puts out. One of the few aftermarket cats that seems to work well is the HJS Tuning one. It will be much less restricting(to the point that it's almost as if you don't have a cat), so you have more performance, but your exhaust won't be as clean, and it's a pretty expensive setup that can be just as expensive as an OEM cat when welded together with a good mid-pipe. Still a lot better than a catless setup, though.

 

Ok so wen I have catless exhaust I make more pollution have better performance and engine going well this setup makes nothing to engine. When I have poor quality cat then better throw it out and make OEM or normal pipe. I understand it in that way am I right? So maybe that check engine light is because I don't have cat so also I don't have sonda lambda. Yeah have to check it and then I will make some photos and share it here. Although Thank you so much for your help so far. I wanted to drive this car 1000km possible that I would spoil the engine. Thanks to you my 8 is still alive.

 

^ That is right, no cat equals more performance but more pollution. If the car is stock but the cat has been removed or gutted then you will get a check engine light and a code will appear for this. If the cat has been removed or the insides have been gutted then you're car will drive the 1000kms without any issue even with the check engine light on (assuming there are no other problems with the car).

I'd say that if you are getting flames that easily, then most likely you don't have a cat or it is gutted.

 

The OP said he hit 155mph? or 250 km/hour?

Sounds like it works great at the moment.