Hello, long time lurker first time member. Have a 2013 skyavtiv hatchback that i've done almost everything to the engine you can think of with the exception of boost. So far its not dead, yet.

 

Welcome to the forum. Which Mazda do you own and tell us more about what you have done to it?

 

I have a 2013 Mazda 3 hatchback, 6 speed auto, that I use as my daily driver but I also use as a 13 second bracket racer. Gutted the whole back and installed a removable wooden platform so I can use it to move stuff. Made a custom intake manifold, reducing the runner length by 1/2. I install that when I race. Created a 35 HP nitrous kit. Even threw some methanol into the engine just to see how it would react. Most of the stuff Ive done is track specific and I don't use on the street. The 13-1 compression ratio really lends itself well to nitrous and methonol, but because the engine is meant for efficiency not performance, you can't go crazy or you'll blow it up.

 

WELCOME TO THE FORUM
I am not sure I agree with the intake manifold shortening....try not to believe all that is told to you or your read. I would like to see a picture of it out of curiosity! Your engine is not really needing a intake manifold change for what you use the car for? Are you have you changed or considering changing cams, throttle body and exhaust system?

You would be better off to get another donor head and do some DIY port blending and cleaning up. Paying special attention to the exhaust side! Then think about wrapping the complete exhaust system to maintain a better consistent exhaust velocity.

The use of as you say adding to the gasoline Methanol will only create havoc on the ECU with your timing and fueling which you would be able to see if you use monitor to watch is connected to your OBDII connector.

If you are going to start using a home brew and nitrous it truly time to set up a stand alone AFR monitor. Before I would advise on Nitorus I would need to see a picture of your nitrous and exactly who's components you are using. To many people build poorly thought out and mis-macthed parts to create a DIY N2o system that is not safe for an engine. Your engine should be able to safely go to a 50 shoot. But leave the methanol out of the tank. LOL. If you want to use something for protection then think about a water/meth system instead of just randomly attempting to mix meth in gasoline. Are you seeing I don't really like the idea of mixing Methanol in with gas yet? If you do the formula math you may conclude are only creating a condition that the ECU can barley keep the engine in a safe operating zone.Now if you get a program and "FULL" access to the ECU you can make the adjustments NECESSARY to use Methanol hahaha! Hey its your engine so I am sure anything I say you are going to do what you want until you get your car towed home.

Most of what I have said I can support be you simply posting a handful of your Time slips and indicate the ambient if they are not included on the slip!

My response is only to help you not to criticize. I like another 1320 driver and also a DIY performance modder !

Here is one of many N20 systems I have built over the years. This one goes on my 1.6 that generates over *450hp (conservative the real number I don't publicize on any forum )
I am also currently building a N20 for my 2018 Mazda 3 and have already tested the limits the ECU can handle... so basically a 50 shoot unsupported.


*1.6+
3 stage nitrous system one stage is capable each, Fogger is up to 100shoot. There is a launch and mid transition nitrous with the final injection each, Fogger is up to 100shoot
This is fully supported with parts and a special ECU calibration.

 

Quick reply

The intake was to overcome air restrictions at high RPM. In stock setup I could not get the car to get past 85MPH in the quarter. It would just fall on its face. The intake is amazing for torque but not great for horsepower.

Methonal. I should have been more clear on this. I don't run a straight meth system because of what you pointed out. Overall it would take way to much meth and to much advanced timing to get it to work. I have a secondary rail running off a 1 gallon tank located at the back where the stock muffler would have been. I use the meth to cool the engine because I was having issues with the auto transmission shifting hard latter in the day, due to heat build up in the engine bay. After 2 - 3 track hits the auto would start shifting hard, throwing my times off but 1/10 - 3/10s. The system piggybacks off the firing of the gas injectors. Its super crude and has port flooding issues, but it works most of the time.

The great thing about this setup is its easy to swap the intake, meth system, and nitrous. Once you get the pluming done its all about swapping the intake in and out the reprogram the PCM.

 

Forgot to add. Nitrous. Its a small 35HP shot that I use at the top end, around 5380 RPM. This is to help overcome intake air restrictions. Its a wet shot that pull the fuel from the meth tank located in the back. A PCB I designed monitors the Cpk then cuts when the auto shifts.

 

I would still like to see your intake.. While your theory is sound your conclusion is questionable. There really is not restrictions in a composite plastic intake as you think. And the CFM at least equals the stock engine. Now getting on the bottle your would need more intake volume but unless you go with a properly built larger Throttle body then the stock throttle body even @WOT is restricting the total cfm into the intake. This is also another item that makes me question your results with the intake? A cross sectional cut of the intake as well doing a bench flow check will show you better information. But hey if you think it works for you it all good..... hahahaha

I run water /meth as well if you looked closely at the intake. There is also another added fuel source (not gas or meth ) so to say that makes for more power and putting on great exhibitions at car shows while not moving an inch. ha!

If your running hot between runs it may be time to think about adding a fan or 2. Or at least set up a manual by-pass to the stock fans.
Why would you use the small shot N20 at the top instead of improving the 60ft times? A 35shot on the top end is going to make so little difference in your times overall then using it at the lower speeds?


REMEMBER WE ALL LIKE................
PICTURES PICTURES PICTURES!!!!!!!!

btw where are you from (country and if USA state? ). You did not post that?

 

Before I go any further, this is starting to turn into a confrontation than in introduction. I'm not going to post intricate detail of the build because I didn't think I had to.

 

I was only attempting to give you sound as I thought you to be a competent DIY that might have wanted some useful advise and information? Honestly you posted information no pictures and less then accurate information. You happened to catch the interest of someone that might be knowledgeable and experienced and you take it as confrontational? Hmm? OK then!

Did you get the impression at any point that I may have some less then experienced based and useful information that could help you in the future?

But I see you already checked out my user information. Maybe even pop on a thread or 2 I have posted on or created? So maybe you might conclude what I just said above in this response?

 

I apologize for getting this headed down the wrong direction. The intent of the welcome section is for introductions. My hope was to have you share what you are proud of with your Mazda.

There are other sections of the forum for people to post their questions and seek guidance. I don’t think there is a section for people to post their accomplishments and have others provide unsolicited critique and insist on pictures. Nor do I think there should be.

Help should be provided to those who ask. A kind word and a welcome should be provided to everyone new to the forum. Let’s not chase people away.

If someone thinks their ways are better, they can post a thread about their build and explain their methods. Others can learn from the example instead of being turned away by an unsolicited lecture.