hey all,

i spend my last 2 months read about how to tune my ecu by my self, i like to use Crome pro,
but before i buy the tuning kit and crome licene, i only need to know one more thing,,

always i read that i have to advance the ignition until the engine knocks or i have drop in power,
but i really didn't read or find any article explain how do i know when the engine start to knock,



any advice or info, even some LINKS ??

 

Reading plugs or use a dyno. You can fully tune a motor solely by reading plugs

 

so it takes weeks to tune a car ???
it should be another way to do it ..

 

No, this method has been proven to be false. Do some reading at efi101.com

For knock you can install a knock sensor or get a knock listening product. But you wont use this to tune timing, just to have an ignition trim for safety.

To tune timing you need to watch for MBT while keeping a safety margin. You absolutely need a dyno. It takes about an hour.

I would suggest a better tuning software besides Crap I mean Crome.

 

thanks man,
but what do u mean by MBT,

i see that i can't see the knock during the street tuning, RIGHT ??

if that right, so how will i know my limit when i advance ??

thanks

 

like everything, learning something or doing something for the first time will develop a habit. if you have poor practice, it'll turn into a bad habit. rent a dyno and learn to tune from there. the only street tuners that are effective are experienced ones and even they are a lot of times - wrong. the dyno will tell you exactly where you are gaining power while making ignition timing changes.

 

u can get a man on the moon using crome. lol

 

Start with very little timing. As you advance it, from one pull to the next, torque will increase. Finally you'll reach a point where it stops increasing. Right around this point you really need to be careful with knock. Race gas will give you some degree of safety. You'll see no change in torque for a couple degrees and then torque will start to decrease rapidly with any further advance in timing. That point where torque flatlines is MBT usually called maximum brake torque. You want to set timing a few degrees before this point for safety. At low load levels it's not as critical, but in higher loads you want a bigger safety margin.

Once you've tuned a few points you can interpolate between them. You want a nice smooth line.

If you use the method of advancing until knock, depending on what kind of gas you're using and other factors, you may overshoot MBT. It's not reliable especially when there are good tools available to us.

And if you haven't seen "MBT" before you haven't done quite enough reading. There are several books available that will give you a decent introduction to tuning.

 

thank u all, u helped me alot in this, i was confusing, but now i get the idea, all i need is to start tune,

so wt do u mean by MBT ??

when i advance, advance all the table or what, 'i'll start with the steet for now'..

thanks again ??

 

http://www.lukekailburn.com/detcan.html

 

https://honda-tech.com/forums/showth...light=det+cans These work for tuning till you reach knock. If you do hear knock, it is at this point you need to back timing and possibly even boost or run higher octane to avoid knock. There is a lot more to it then what has been mentioned. I am unsure how well they will help you tune for mean brake trq. (MBT), but if you dont have dyno that you can tune on, these work well for making sure your not going to run too much timing. You also must tune your fuel AFRs as well. A search would bring a wealth of information to your fingertips.