what causes the engine to backfire? Is it to much air, or to much fuel, or what?
Thanks

 

typically what you get is the excess fuel being pushed out of the engine, that is why when you have a midpipe you can shoot flames

 

Excess fuel goes out to the cat and the cat ignites it causing a backfire. With a midpipe, you'll shoot flames instead.

 

so maybe I have the boost set to low on my new single, and it isn't getting enough air into the engine?

 

You have a single, yet no EGT gauge to tell you these things?

 

what exactly is an egt gauge?

 

http://www.rx7.com/cgi-local/3catalog.cgi?cat=12&part=3

 

thanks, but I have an A/F gauge, isn't that good enough?

 

Nah, the A/F gauge is really just a bunch of sparkling lights. It's comedic that you have a single and didn't even know what an EGT gauge is. Did someone else install it? And what computer is it running off of? How did was it tuned? I'm not clowning, I just think it's funny.

 

Gee DK, what makes you think he doesn't have a $1000+ A/F meter installed? :-)

 

Hey DK, what else makes you laugh, since that is what I am here to do. Why would I need someones pure knowledgeable advice when I can spend my time humoring people like you. I may have heard of an EGT gauge before, but no one ever expressed to me it's importance. I installed my single kit myself, and currently it is running off of an upgraded ECU by Pettit, until I can sell it and get a power fc and some larger injectors. It hasn't been properly tuned yet, because I finished installing the kit Monday.

 

lovemyseven, I believe DK is laughing at you because you seem to have jumped into a very large modification without any preparation or research. I have not had my FD for long and I have not done any major mods because of that fact. It's a very good idea to get to really know the car first, and make sure it is running tip top before doing ANY mods, let alone going single.

Judging by your lack of preparation, you have just installed a hand grenade. Do more research and talk with a knowledgable FD tuner before you destroy your engine.

 

jesus christ lovemyseven, dont drive your car ANYWHERE! You're gonna blow that thing up running a single on a pettit ecu (upgraded stock)

you need a standalone unit for your car as well as a slew of other things...what other modifications have you done to accomodate for the single turbo?

EGT is said to be better than an AF-- higher exhausts temps are a sign of running lean...something you can't tell with an AF meter since they are only accurate at WOT

 

Wow ... you sound like a nice guy who doesn't ever overreact. See, I can be a sarcastic *******, too. Enough with that ... I was actually trying to help you so let's get back to that.

rynberg is right, I'm alarmed that you have a single and no awareness of an EGT gauge and it's value for tuning. An EGT is one of the most basic things to put on an FD because of the dangers of running a rotary lean. It will indicate a constant and consistent sign of the fuel mixture throughout the powerband. I asked who installed the single and tuned it because if it was a shop, I don't want anyone else taking their car there since they didn't consider an EGT reading prudent. I asked you what engine management you were running on the same merit, and we appear to have uncovered a potential big problem for you in that department. I do congratulate you for doing the single install yourself and getting to know part of your car that way ... as I would do.

Look man, I'm a very joking person with a very happy soul ... you can't always read what I type as how you'd read it. I'm a helpful person -- just watch my posts. But if you computer screen overreact I will most likely call you on the attitude and you may not like me. Now get your mitts on a new computer and an EGT gauge!

And as for capt. bill1 ... he's just a grumpy old man! Just kidding! I love Bill ... he drives a big boat.

 

All I have to say to DK is... "..."
I like, big, boats and I can not lie!

 

I apologize if I overreacted a bit, but your post seemed to sound like you were a know it all, but apparently that wasn't the case. It's all good my man. Anyway, even with the Pettit ECU, the other day, my a/f gauge was reading really rich. Maybe I have the boost down to low. I will have to look into the egt gauge. Thanks for the help

 

Let's just say that DK has a lot of "fortitude". (Would that be 2, twentitudes?) The man does know his way around an FD. (Oh sorry DK, that would be an FD3S)...now if he only HAD the one that I jacked from him his bad self a while back.... An EGT is probably one of the most single useful and cheap mods that you can do on ANY engine in order to have a handle on what's going on.

 

cheap? the website that was recommended listed it for over 200!

 

$200 is a HELLLOVA lot cheaper than a new engine.

 

does anyone know where I can get one cheaper?

 

You just bought a single turbo kit and you don't want to spend $200 on a gauge?

 

Yeah man dont chince out on a guage that can save your motors life, just stay out of boost until yuo have a good egt guage.

 

No, but if you want the very best set up I've ever seen for engine montoring this has got to be it. It will take a few mods but the 4 cylinder unit would be awesome. You would leave two of the probes disconnected at some of the sending points:

www.aircraftspruce.com

and look for the EDM 700 Digital Scanner. You want info on how your engine is running? Check out all of the standard functions. Throw in fuel flow option and transducer for a few more bucks and you'll know EVERY important parameter about your engine while it is running. This is the ****!

You can also find some very inexpensive EGT only guages by clicking on the instruments button and the looking for EGT's in the list. There is one I really like called the microflight 1000 that has dual read outs for about $100.00. It's really small and business like.
Ideally you need a sender on both rotor's exhaust to know what's really goin' on since one can be perfectly healthy and one running lean. You can also learn to "read" spark plugs but by then it's usually too late and we all know what happens when rotaries run lean......KABOOM!

 

I'll check it out, thanks

 

I think the best set up is the Westach FAA approved dual EGT and CHT (cylinder head temp) units, numbers K32X and K33X. At $138.00 and $94.00 you can have a handle on both rotors at the leading plugs and both exhaust ports. The fact that they are FAA approved speaks volumes for their quality and accuracy since they have to meet extremely stringent standards for approval in factory built airplanes.
So much of the other **** that you see offered for cars is absolute junk marked up to stratospheric prices and hyped to the nines. This is quality stuff - it may not be "trick" looking and is something you would probably not want on your dashboard but it sure would be nice to hide 'em at an angle in the glovebox or some sort of hinged panel underneath the dash or glovebox. This would be the absolute cheapest insurance you could ever get to keep from goin' lean, and would be a huge help in tuning. This is probably more than you ever wanted to know about quality EGT guages available on the market but damn, it's REALLY important if you're going for big hp gains without turning your engine into a freakin' grenade. Good luck!