DIY: Ultimate SAI/N249/PCV/EVAP Delete

[erevlydeux]

This may be a stupid question, but if the ecu no longer controls your boost levels then what does? I've got the stage 3 APR kit and am about to do this full delete, but I have no manual boost controller or anything.

Then you need a manual boost controller.

[chaveezy]

Well, your N249 just interrupts your DV/BOV so it will still work just fine connected directly to manifold pressure, better in fact. During self troubleshooting or limp, the ECU will induce vacuum to your DV/BOV, using the N249, in an attempt to pull boost from the system. The N75, EBC or MBC will still control your boost levels.....

Understand?

[HardHittaz00]

Thanks chaveezy! I kind of understand But you're saying I'll be fine without a mbc? I will still boost and cut off at the proper levels?

[chaveezy]

Yes of course it will, your chip controls your N75 valve, which bleeds boost away from the wastegate, which in turn raises boost levels. (without the N75 you would only boost until wastegate pressure is reached ~14psi, depending on your installed spring).

Your N249 valve is another way to interrupt the DV, which is just another way to bleed boost levels away during self troubleshooting (limp), and other part throttle conditions. I'm not sure of the exact N249 logic, but in a nutshell that's what it does/is able to do.

Hope this helps.

[HardHittaz00]

Yezzir! Much appreciated! Just was a little confused.

[l88m22vette]

(without the N75 you would only boost until wastegate pressure is reached ~14psi, depending on your installed spring)

With a Forge actuator or straight spring on a 3071, yes, but the k03/k04 run at 5psi on the spring, which is also why limp mode is at 5psi (you can't get around the mechanical boost controller)

[chaveezy]

I'm on a GT2871R and I'm at standard wastegate pressure (~14psi), however, it was more to make a point.. That's why the note, "depending on your installed spring".

Good catch though

[kdawg24]

dont know if i missed it in there but what are the benifits of this delete. Thanks in advance

[hootyburra]

dont know if i missed it in there but what are the benifits of this delete. Thanks in advance

to help you become less of a noob and more familiar with your car.

[kdawg24]

thanks dunbsh*t any one else that is not an a**

[nstevic01]

Well he is correct in a way, you do get more familiar with your car. If you are new to cars or your dub in general, I would not recommend this as a first mod.

Some benefits include, cleaning up the engine bay making things like oil changes and identifying leaks easier, simplifying the vac lines, the addition of an oil catch can to trap the "crap" that goes through the old PCV setup.

Also is beneficial in saving money on costly part replacement in non-emission states. So if your SAI, EVAP regulator, or Combi go bad, you can just delete them.

Most everyone will agree that the car runs ALOT better with this delete done. Keep in mind if your state has emissions related inspections, you will most likely fail if you perform this delete. So keep that in mind.

[kdawg24]

thank you nstevic that wasnt so hard, i'm not new did timing belt by myself just not advanced enough to start removing designed in parts of the car with out asking what the benifits vs risk are and i am in cali so this would not be prudent due to emission standards

[sprockeTT71]

Just to be sure...I can leave the evap, n249, & n112 plugged and tucked away?

Also, can anyone tell me what to do with this on my TT (awp)? It is in the location of the blue balls on the normal AWP. It has 3 wire so resistoring doesn't seem the option. The lines go to the same location you remove and cap. Right now I plan on leaving it in placed connected.

Thanks.

[erevlydeux]

Just to be sure...I can leave the evap, n249, & n112 plugged and tucked away?

check my sig. I can help you with getting some nice resistors for evap/n112/n249 so you can shed that extra weight/clutter.

[finesse]

Can I delete the pcv system and not bother with a catch can?

[Dub-Nub]

Can I delete the pcv system and not bother with a catch can?

You cannot plug up the holes. You can use a filter on each location, some have done it. Or you can run a hose down to the floor so it leaks on the ground.

[finesse]

thank you dub,

I have to do this on a budget

[Big_Tom]

^^^ get rid of all that ish and run a hose to the floor from the crankcase and a filter off the valvecover and be done with it

[J@H Dub 1.8t]

This is a GREAT diy but my question is have there been any boost leaks?

[Cobra397]

I am about to do this delete but I am wanting to leave my Evap system alone. If i follow the first part of this guide do any of the lines intersect the EVAP system? or should I be fine. ? thanks for any help.

[RobClubley]

You'll be fine. As you can see the evap system is separate:

[carsluTT]

great info

[pryorjack]

What will happen if I only remove the sai, n249, and pcv systems and run a separate line for the evap?

[RobClubley]

What will happen if I only remove the sai, n249, and pcv systems and run a separate line for the evap?

I've done that - and removed the evap line to the intake leaving just the one to the throttle body. No issues.

[pryorjack]

I've done that - and removed the evap line to the intake leaving just the one to the throttle body. No issues.

awesome. i will be doing this soon

[pielout]

Since I just got chipped(Unitronics), I also got the CAT SAI and EVAP deletes in the program....my question is do I still have to run resistors since those got deleted already? I wouldn't think so but I'm not sure

[carsluTT]

Since I just got chipped(Unitronics), I also got the CAT SAI and EVAP deletes in the program....my question is do I still have to run resistors since those got deleted already? I wouldn't think so but I'm not sure

well... search would tell u this, but ill make it a touch easyer for you....... yes u need resistors even if u had the deletes done in your software and removed the physical parts. with out resistors your car will not adapt the fuel trims and such properly. all that happens with out the resistors is ull have a car that runs ok and dosnt get a cell the way your setup now. if you use the search button or read this whole thread u should find plenty of info showing why its important to have both a software delete and resistors to get things running properly.

[pielout]

thank you for being kind and not blasting me to hard I DID read every post in this thread I just didnt recall anybody saying they had the deletes and resistors(maybe I did just didnt catch it) now I know, thank you sir

[MNShortBus]

So far I have removed everything but the evap system. Are there any negative effects of removing the evap system, or risks? I don't have emissions testing in my area, so I'm not worried about that.

[mooreboy947]

Question here there is a picture of the evap lines being capped off after removal behind coolant ball.... Tell me if I'm wrong but wont that cause vapor lock since the vapors have no whre to go but through the gas lines or shooting your gas cap off at the pump.Please correct me if I' wrong on that one so I can correct it or not.

[1.8Tbsl]

Need Help...I did the full delete and now i have a very bad idle. Goes up to around 1000rpm and then down to 500rpm and eventually car dies out. I can drive, but once i come to a stop it almost dies unless giving some gas. No codes pop up.

[RobClubley]

Sounds like you might have a vac leak somewhere

[nstevic01]

Question here there is a picture of the evap lines being capped off after removal behind coolant ball.... Tell me if I'm wrong but wont that cause vapor lock since the vapors have no whre to go but through the gas lines or shooting your gas cap off at the pump.Please correct me if I' wrong on that one so I can correct it or not.

13k miles with this method and 0 issues.

[HereTryThis]

I cut mine back to the pump and left them un-capped. no issues, slight gas smell on the odd day.

[mooreboy947]

I didn't want to seem like a smart ass or anything just trying to figure out the best way to do it. Is there any way to permantely delete codes with VAD mobile anyone???????