Too Much Fuel, Too Soon? And Other ???

***cleatus12r*** · #1 Thu, October 1st, 2009, 02:28 PM

Quote:

Originally Posted by theSLEEPER

Does anyone know about what a stocker puts out in CC's per each shot at it's max?

What do ya'll feel like a good ICP max is at WOT on a stock injectored motor with stock oil? 2800-3000 PSI max.

I've put a 10K mod on top of my chip once before when I was running an extremely laggy BBW turbo, and it seemed to help the spooling a good bit. Yep. That's about normal. The higher injection pressure at low RPM will help spool the turbocharger by increasing EGT from a more complete burn.

Does anyone know how to wire up a potentiometer into the ICP and which one to use? I'd like to wire it with a switch so that I don't have to run it all of the time, but I feel like there's a little bit to be gained with a slightly increased ICP over what I have now... Yes. I will attach two pictures that I drew up for a guy over at the Nation who had some ICP Mod concerns.

A scanner will not read ICP correctly if I have a 10K in there. Correct? I'd have to check it with a mech. gauge right? The scanner WILL show the desired pressure (and what it thinks is correct), but it will actually be higher than what is shown on the scan tool. You will need a gauge to see what is actually happening. The only differences you'll notice on the scanner is the IPR duty cycle will be higher when the ICP Mod is active.

These are simple ICP mods. The "series" one has become the most popular and common resistances are 10k-20K ohms. This WILL cause problems with aftermarket tuning because you WILL run out of high pressure oil if you have a stock system now.

Don't laugh at the pictures as I only donated about 5 minutes of my time in MS Paint.

theSLEEPER · #2 Thu, October 1st, 2009, 03:18 PM

Hey Cody. Thanks for the info, but I was thinking more along the lines of something like a variable resistor, that I can use to dial in my ICP.

I also dont really want to fool with the IVS, just a simple on/off switch would be fine...

Have you ever messed with a potentiometer? I just need to figure out how to wire it up to work like a variable 10K mod.

***cleatus12r*** · #3 Thu, October 1st, 2009, 06:50 PM

Actually, a couple years back I actually made a couple dozen "Low-End Menders" that were just that. They did have an IVS input but they also had a toggle switch to turn them on and off.

I used a 5K ohm resistor in series with a 5K-10K potentiometer that was user-adjustable.

I'll draw up a schematic tonight for you.

theSLEEPER · #4 Thu, October 1st, 2009, 09:27 PM

Wow! Thanks Cody! You're the man! I'm excited. I can't wait to get my .84 exhaust housing machined and give the BBW another try with some help spooling...

Do you know if there's a way to tune for lag? I always assumed a little extra fuel, ICP, and timing, even on stock injectors, could help to quickly spool a turbo that may be a little too large/laggy...

Thanks again! You made my day!

***cleatus12r*** · #5 Thu, October 1st, 2009, 10:01 PM

As promised. No relay, no IVS influence.

theSLEEPER · #6 Thu, October 1st, 2009, 10:26 PM

Sorry to be a pain. But which color is to the PCM? And just for my own mental library, what do the other two wires go to?

***cleatus12r*** · #7 Fri, October 2nd, 2009, 09:03 AM

Quote:

Originally Posted by theSLEEPER

Sorry to be a pain. But which color is to the PCM? And just for my own mental library, what do the other two wires go to?

Blue/Red (or Green) out of ICP sensor to PCM. (Sensor Return)

Brown 5V Reference (VREF)

Gray/Red Sensor Ground (Signal Return)

Just for shiggles, there is another ICP Mod that uses a resistor in parallel with the ICP sensor that went between the blue wire and the gray wire. However, the LOWER the resistance in that setup, the HIGHER the ICP would actually be.