Removing N249, N112, SAI, EVAP need your advice

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professor

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	Removing N249, N112, SAI, EVAP need your advice « on: April 03, 2012, 03:38:30 PM »

Lots of DIY shows how you can easily remove those valves and hoses out of your car.
Throw 330Ohm / 10W resistor and you ll not have CEL after removing them.
But thats all? Car will run fine? Incorrect flow wouldnt be a subject?

Whats your opinion on this? Is there any guide to do it and also, if need, the proper adjustments to the car program?


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masterj

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	Re: Removing N249, N112, SAI, EVAP need your advice « Reply #1 on: April 04, 2012, 05:45:06 AM »

with resistors you can only trick ecu into thinking that it has all those components. To properly remove them and all asociated DTC you have to code them out


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julex

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	Re: Removing N249, N112, SAI, EVAP need your advice « Reply #2 on: April 04, 2012, 06:16:20 AM »

Quote from: professor on April 03, 2012, 03:38:30 PM

I removed N249 a while ago but then I reverted back to have it running b/c I didn't like the lingering boost in my manifolds once out of full WOT. It would spike pretty hard. I was also getting occasional fault codes for overboost when in part throttle and letting the gas pedal go.

It all can be coded out or tuned for but not using N249 makes the system harsher.


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Rick

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	Re: Removing N249, N112, SAI, EVAP need your advice « Reply #3 on: April 06, 2012, 02:45:26 PM »

No, removing 249 makes things smoother on trailing throttle. Your tune is incorrect if you're throwing codes.

Rick


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julex

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	Re: Removing N249, N112, SAI, EVAP need your advice « Reply #4 on: April 06, 2012, 06:06:04 PM »

There is a reason for N249 and it is to divert charge through DVs before natural manifold pressure can do it by connecting DVs to vacuum reservoir instead of waiting for vacuum to arrive from intake manifold.

And my tune is fine, thank you. Only lack of N249 was making it unhappy, otherwise no problems at all.


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kenmac

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	Re: Removing N249, N112, SAI, EVAP need your advice « Reply #5 on: April 06, 2012, 09:40:02 PM »

Quote from: Rick on April 06, 2012, 02:45:26 PM

No, removing 249 makes things smoother on trailing throttle. Your tune is incorrect if you're throwing codes.

Rick

I have my N429 deleted and I experience exactly what julex has described. I miss the old N249 functionality. I'd reinstall it but I hastily chucked the parts when I removed them. During part throttle, it almost seems like the car cannot decide whether or not to build boost or relieve it through the DV. However, it's something you learn to work with.


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kenmac

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	Re: Removing N249, N112, SAI, EVAP need your advice « Reply #6 on: April 06, 2012, 09:42:10 PM »

professor, here is the DIY I used a while back.

http://forums.vwvortex.com/showthread.php?4893472-DIY-Ultimate-SAI-N249-PCV-EVAP-Delete


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kenmac

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	Re: Removing N249, N112, SAI, EVAP need your advice « Reply #7 on: April 06, 2012, 09:45:18 PM »

Also, if were to do this again. I'd keep the EVAP components. They take up almost no engine space and serve a function


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