[alexdsmtsi]

hi did someone can learn me what is exactly injector deadtime ,if you have nothing to compensate for that ,like dsm link or a chip,what it does ???

thanks
alex

 

[Boost92AWD]

Hey I got a better idea for you, how about you go spend alittle bit of time reading the rules. You need to use proper grammer. Keep that shit up and your going to have a little vacation time.


As for your question, if you would of searched you would of already had your answer.

 

[alexdsmtsi]

sorry for my grammar im not very good in english.
and for searching, i search and didnt find a real definition of injector deadtime. All that i find is discussion about setting for the deadtime in dsmlink but it didnt respond to my question.

if you dont want help me its ok i will find my answer away and by the way your reply was like a good little exemple of bashing,no?uke:


thanks
alex

 

[autocannones]

The injector deadtime map compares the deadtime of the fuel injectors to the battery voltage. The first byte of the map is 4.7 volts, the second point is 7.0 volts, then 9.34v, 11.68v, 14.0v, 16.35v, and 18.7v. The decimal value of each byte refers to the deadtime of the injectors, divided by 24 microseconds.

The stock map is "A9 58 30 23 1B 17 13"

If you wanted to add 200 microseconds of deadtime, you would add 8 to each of the values on the map, since 200 / 24 = 8.

For 550's, you want about 150-175 us more deadtime. 660's will be above 200, usually around 225 or 250. However, these settings will vary from car to car, and between different types of injectors.

 

[alexdsmtsi]

ok thanks

but i dont have dsmlinks what happend if i run my pte 680 whit 2g maf whitout compensate for deadtime?.
is it true that it will affect more at idle that at wot?,did it gone be harder to tune ??

thanks again
alex

 

[autocannones]

To tell you the truth man i could not tell you. Thats about all I know about it.

 

[Boost92AWD]

ok thanks

but i dont have dsmlinks what happend if i run my pte 680 whit 2g maf whitout compensate for deadtime?.
is it true that it will affect more at idle that at wot?,did it gone be harder to tune ??

thanks again
alex

Just warning you, you better start using the shift key to start sentences and you need to use "I" not "i". I would suggest using proper sentence structure.

 

[stevep]

Injectors are mechanical devices. It takes some time from when you apply power to the coil for the pintle to start moving and fuel to spray. This reduces the time available for the fuel to be injected. Then when you turn off the power it takes time for the pintle to close. This extends the time available for the fuel to be injected. Subtracting the open time from the close time gives the injector deadtime.

When we talk about deadtimes we are usually talking about the difference between the factory injector deadtime and the new injector deadtime. The new injectors typically need more time than the factory ones.

So injector deadtime is really dead time where the ECU is activating the injectors and nothing is happening. It's a fixed value that needs to be added to any injector pulse width to correct for these delays. If the value is too small the injector will spray less fuel than expected and if too large more than expected.

Steve

 

[giganews35]

Hey I got a better idea for you, how about you go spend alittle bit of time reading the rules. You need to use proper grammer. Keep that shit up and your going to have a little vacation time.


As for your question, if you would of searched you would of already had your answer.

Would have not would of.

 

[TSi16GAWD]

Originally Posted by Boost92AWD
Hey I got a better idea for you, how about you go spend alittle bit of time reading the rules. You need to use proper grammer.

You should practice what you preach.

Grammar not grammer.
BTW the mods give some people a break. Especially out of country men. I'm assuming he is French Canadian.

 

[alexdsmtsi]

Originally Posted by Boost92AWD
Hey I got a better idea for you, how about you go spend alittle bit of time reading the rules. You need to use proper grammer.

You should practice what you preach.

Grammar not grammer.
BTW the mods give some people a break. Especially out of country men. I'm assuming he is French Canadian.

THANKS

 

[tsieagle]

His English is better than my French!

 

[alexdsmtsi]

What happend if i run my pte 680 whit 2g maf whitout compensate for deadtime?.
Is it true that it will affect more at idle that at wot?,did it gone be harder to tune ??

thanks again
Alex

 

[stevep]

The missing deadtime will cause the car to run much leaner, more so at idle that at WOT because the deadtime is a larger percentage of the total at short Injector Pulse Widths. If say you needed an extra 330us and your idle IPS is 1.7ms the missing deadtime will eat up about 20% of the time the injectors should be spraying fuel. At WOT the error could be around 2% or less depending on the Injector Duty Cycle.

Trying to tune the car with multiple changing variables (MAF and Injectors) is harder than when you only have to account for one. That's why hacking the ECU is popular since it avoids making the compremises you would have to make with a SAFC or other piggyback.

Steve

 

[alexdsmtsi]

OK. So its not gone be harder to tune whith a safc2 ,im just gone have different correction,right??

thanks

 

[stevep]

So its not gone be harder to tune with a safc2?

Harder than what?
Harder than a EPROM chip that you just plug in? Yes.
Harder than DSMLink? Yes.
Harder than a MAFT? No.

You also get a better tune (including part throttle operation) with a chip or DSMLink than you will with the SAFC.

Steve