[RainMaker]

A capacitor or resistor (or any steady state electronics) cannot create a "delay". They can only filter faster or slower transients.

I would not consider such a mod worthwile. The necessary delay will be relative to how fast the air is moving and where on spool-up it is. No simple electronics can do that for you. A microcontroller like a 68HC11 might offer what you want... but probably isnt worth the trouble.

Chris

Originally Posted by daemon

I've thought about it. In the absolute simplest form, a resistor and a capacitor could be used to "smooth" out voltage transitions. However, I believe you'd actually only want to smooth out an increase in voltage and not a decrease (since when the throttle slams shut, it slams shut). For that, possibly add a diode to allow the voltage to bypass the resistor when discharging.

However, I'm not an electrical engineer either and there are a decent number of unknowns for me. I tried running a few numbers to see just how big a resistor and capacitor would need to be to get a ~100ms delay (a basic starting point), and the values seemed a bit higher than I would like. To use a small resistor so as to not effect the amount of current in the circuit would force us to use a pretty darn big capacitor. To get the capacitor to a reasonable size would require a large resistor (not physically large, but large enough in value to possibly hose the current levels). Of course, I could have gotten the numbers all wrong.

Either way, the circuit is a simple one, so it might be "fun" to just throw on some components and hope I don't fry anything important. Actually, frying wouldn't be likely IMHO, for whatever that is worth.

And, fwiw, a capacitor's charge time is not a linear slope. The proper solution might be a microcontroller with an onboard ADC/DAC and then just write a mini-program to translate and delay as needed.

[daemon]

Originally Posted by RainMaker

A capacitor or resistor (or any steady state electronics) cannot create a "delay". They can only filter faster or slower transients.

Notice I used the word "smooth".

[ride5000]

Originally Posted by RainMaker

A capacitor or resistor (or any steady state electronics) cannot create a "delay". They can only filter faster or slower transients.

not necessarily true.

all reactive circuits create some amount of phase shift.

depending on the input this may or may not result in a signal "delay."

[RainMaker]

Originally Posted by ride5000

not necessarily true.

all reactive circuits create some amount of phase shift.

depending on the input this may or may not result in a signal "delay."

Awwwww... that was not fair. True, but a phase shift means a fraction of a wavelength in time... not enough to spool a turbo

[ride5000]

i do agree that trying to achieve what is proposed is impossible with LRC circuits.

i'm starting to think that there may be a "delay" register buried somewhere in the ecu code that is based on intake tract volume between the mafs and the combustion chambers.

ken

[TheMadScientist]

Originally Posted by ride5000

i'm starting to think that there may be a "delay" register buried somewhere in the ecu code that is based on intake tract volume between the mafs and the combustion chambers.

ken

My thoughs exactly.
I have tuned a blowthrough and have read about other people with a blowthrough. The rich dip is not there when using the blowthrough setup. IMO it is a delay between when the MAF reads the airflow and when the airflow reaches the motor.

TMS

[crystal_Imprezav]

Hmm interesting find...
http://www.maftpro.com/tproinfo.shtml

[daemon]

Originally Posted by crystal_Imprezav

Hmm interesting find...
http://www.maftpro.com/tproinfo.shtml

Post #101.

[TheMadScientist]

Originally Posted by crystal_Imprezav

Hmm interesting find...
http://www.maftpro.com/tproinfo.shtml

And for the price you would be better off with a used Utec.

$399 for the control box
$12 for the IAT
$69 fot the 3bar MAP
$22 for the IAT harness
$24 for the universal harness

Comes to ~$530 + shipping.

TMS

[04stiguy]

Interesting AFR plot on post #1, third chart down. Also read post #50.

http://forums.nasioc.com/forums/show....php?t=1195987

[crystal_Imprezav]

Shocker, I am working on a solution, turning my trades to reverse engineering...

[lackskill]

Reverse engineering FTMFW!!! I hope you are successful!

Originally Posted by crystal_Imprezav

Shocker, I am working on a solution, turning my trades to reverse engineering...

[04stiguy]

Minor update. Switched to a blow-thru tonight. Intial drive shows promise. Very smooth. No change in tune intially, and it drives great. I will log stuff in the next few days.

[crystal_Imprezav]

^ Going the same route.

[lackskill]

Originally Posted by crystal_Imprezav

^ Going the same route.

What happened to the reverse engineering???