MK2 How to mod your digi2 air box

[jettadude]

Ok first. this was made to stop all the posts that are gonna be comming in asking about CAI and modding your airbox.

1. Pull your airbox out!
2. Open it up and take out the airfilter and put the top part to the side.
3. Take the tube *aka snorkle* out of the air box. That will make your inlet hole alot bigger.
4. Tear off the preheater pipe. The canvas hose comming out the back of the airbox. They you can either cover it with ducttape like i did or just leave it.
5. There should be vaccum lines going to your airbox. 1 line comming from your engine to a horn thingy, then 1 from the top of the horn to the bottom. Take them off. Plug the line with a screw and ducttape the screw in. If you don't want to duct tape then don't i just like to incase the screw works loose.
6. Take the vaccum line that was going to the airbox and move it somewhere out of the way and use a ziptie to hold it there. MAKE SURE IT IS PLUGED OR YOU WILL LOSE VACCUM!!!
7. Put the airfilter back in and put the 2 halfs of the airbox back together. and reinstall the airbox.

Now you should have a nice size opening for the air box now and no preheater tube. Now if you live in very very very cold climates! such as alaska you might want the preheater pipe but maybe not. With out it the car wont run as good cold but that is livible since you gain at least 10HP from this mod. I'll explane how. When the vaccum builds up *high rpm's* the horn thingy that the vaccum hooked into open up the preheater pipe letting in only hot engine air killing your HP. so when you stop that your getting in cold air all the time! And taking out the snorkle you get alot more air = more HP. Hope this helps! Questions or comments contact me.

[Mr_Diesel]

Nicely said... I notice a considerable difference in throttle response and overall power of the car... Not to mention a pretty slick sound too...

[jettadude]

Nicely said... I notice a considerable difference in throttle response and overall power of the car... Not to mention a pretty slick sound too...
well you should since you taought me how to do that trick! :D

[JaY_III]

does this only apply to GAS VW's?
AS with my Diesel i have already done 3... but i stoped at that point.
Also if it help Diesels, how much Extra HP do you think it will add?

whoops forgot to log in... IS thier an Auto login???

[jettadude]

i think it should work on diesels. ask mr. diesel. and not yet on that auto login

[grantsjetta]

That is really impressive :wink:, i have done an windage tray upgrade in my jetta's engine which help the low end torque like you could not believe, but i have not done that, i am going to have to do that 8)

[Mr_Diesel]

Yeah man... He was telling me about this... I wonder what this windage tray would do to the 1.6 NA or TD.... Mabey I outta try it out on this rabbit of mine.

[sausageburner]

Doing this does help, but i didn't remove the hose from the back of the box... How does taking that off help?

[Mr_Diesel]

Unless you have COLD winters below 10 degrees (f), you don't need it. That's just how the intake manifold and injectors get preheated before the engine warms up... Makes the engine run smoother durring warmup, but when the engine is hot, your sucking hot air in!!!!

[sausageburner]

i'll have to take care of that then.

[jettadude]

im gonna do a windage tray. does anybody know of any place to get them cheap? how much would this cost anyhow?

[Mortal_Wombat]

windage tray = $30 without shipping most of the time, it goes in between the oil pan and the block, the main point of it is to prevent oil starvation from the oil pump during really hard corners...but it also helps to keep the oil from splashing on the crank robbin power :D if you didnt know :D

[GoodDayForADrive]

Does this modification only apply to A2s?

[sausageburner]

yeah, but i wonder if you could apply it to A3's?

[jettadude]

i don't know, ive never seen an A3 airbox

[Mr_Diesel]

I dunno about that... There is a little vacuum hose coming off the front of the airbox that is running down near the alternator or compressor or something... Not sure what corking that hose off would do... Might throw an MIL? Anyway, as far as the actual structure of the box, IF THAT VACUUM HOSE is not too important, you should just be able to cut some holes in your box (the lower half) for free'er flowing air and cooler sound. :twisted: Has anybody done the windage tray on a Jetta since we last brought this up? That intrigues me.

[sausageburner]

not me, but I do want to look into that.

[Mortal_Wombat]

once i find a deal on one im gonna buy a windage tray
i had bought one off ebay but the guy screwed up the shipping and refunded my money oh well

[Slalom]

Now you should have a nice size opening for the air box now and no preheater tube. Now if you live in very very very cold climates! such as alaska you might want the preheater pipe but maybe not. With out it the car wont run as good cold but that is livible since you gain at least 10HP from this mod. I'll explane how. When the vaccum builds up *high rpm's* the horn thingy that the vaccum hooked into open up the preheater pipe letting in only hot engine air killing your HP. so when you stop that your getting in cold air all the time! And taking out the snorkle you get alot more air = more HP. Hope this helps! Questions or comments contact me.

1. 10HP!?!? um no, don't anyone expect this kind of gain
2. the preheat tube is also there to prevent your throttle body from freezing OPEN during winter driving... so if you live in a winter climate with sub zero C temps then i would not recommend eliminating the preheat, you are only asking for a surprise one day when you let of the pedal and the engine doesn't slow down. VW performed a recall on this very preheat system about 7 years ago (in Canada at least) to check and repair the system because of the high number of mk2 digi cars that were experiencing the TB sticking open (and yes it happened to mine many years ago when my jetta still saw winters)

[burn_your_money]

Does this mod work with CIS engines or does it mess up the fuel mixture and stuff?

[HyperNut]

Just a warning... If your air box is not a digi then this will may mess up your car.

[jettadude]

Now you should have a nice size opening for the air box now and no preheater tube. Now if you live in very very very cold climates! such as alaska you might want the preheater pipe but maybe not. With out it the car wont run as good cold but that is livible since you gain at least 10HP from this mod. I'll explane how. When the vaccum builds up *high rpm's* the horn thingy that the vaccum hooked into open up the preheater pipe letting in only hot engine air killing your HP. so when you stop that your getting in cold air all the time! And taking out the snorkle you get alot more air = more HP. Hope this helps! Questions or comments contact me.

1. 10HP!?!? um no, don't anyone expect this kind of gain
2. the preheat tube is also there to prevent your throttle body from freezing OPEN during winter driving... so if you live in a winter climate with sub zero C temps then i would not recommend eliminating the preheat, you are only asking for a surprise one day when you let of the pedal and the engine doesn't slow down. VW performed a recall on this very preheat system about 7 years ago (in Canada at least) to check and repair the system because of the high number of mk2 digi cars that were experiencing the TB sticking open (and yes it happened to mine many years ago when my jetta still saw winters)

ok ok excuse me. not 10HP, but you will pick up a few ponys. and at partial throttle you will notice more power because that is when your drawing alot of vaccume. and the plate is open. but if your TB does freeze shut then when you go to start the car it will break loose and when the car reaches norm opt. temp it would melt anything. the TB gets hot. oh and i wrote that based on little information. but the how to still works but some of the fine details are assbackwards. but i know that now. and after tearing apart a 1.8 8V digi 2 engine ive learned alot more about the specs and what does what.

[Slalom]

Now you should have a nice size opening for the air box now and no preheater tube. Now if you live in very very very cold climates! such as alaska you might want the preheater pipe but maybe not. With out it the car wont run as good cold but that is livible since you gain at least 10HP from this mod. I'll explane how. When the vaccum builds up *high rpm's* the horn thingy that the vaccum hooked into open up the preheater pipe letting in only hot engine air killing your HP. so when you stop that your getting in cold air all the time! And taking out the snorkle you get alot more air = more HP. Hope this helps! Questions or comments contact me.

1. 10HP!?!? um no, don't anyone expect this kind of gain
2. the preheat tube is also there to prevent your throttle body from freezing OPEN during winter driving... so if you live in a winter climate with sub zero C temps then i would not recommend eliminating the preheat, you are only asking for a surprise one day when you let of the pedal and the engine doesn't slow down. VW performed a recall on this very preheat system about 7 years ago (in Canada at least) to check and repair the system because of the high number of mk2 digi cars that were experiencing the TB sticking open (and yes it happened to mine many years ago when my jetta still saw winters)

ok ok excuse me. not 10HP, but you will pick up a few ponys. and at partial throttle you will notice more power because that is when your drawing alot of vaccume. and the plate is open. but if your TB does freeze shut then when you go to start the car it will break loose and when the car reaches norm opt. temp it would melt anything. the TB gets hot. oh and i wrote that based on little information. but the how to still works but some of the fine details are assbackwards. but i know that now. and after tearing apart a 1.8 8V digi 2 engine ive learned alot more about the specs and what does what.

you are not understand the throttle freezing problem... it will not freeze shut while the car is off, it will freeze OPEN WHILE YOU ARE DRIVING, the TB does not get hot when you are driving, it gets very cold... trust me it can happen, i'm only trying to caution anyone driving their car in the winter from removing the preheat system.

[ligur]

What is a digi-ii? As in digifant 2? what is a Digifant 2? I have a 1991 Jetta A2 1.8 Carburettor? Can I do this?

[MKIIVR6]

What is a digi-ii? As in digifant 2? what is a Digifant 2? I have a 1991 Jetta A2 1.8 Carburettor? Can I do this?

The digifant II (2) and the carbed models are two different animals. In yours I would find a nice drop-in K&N filter for it unless you have done so already. Those filters might be hard to find to fit though, those car's seem rare.

[MKIIVR6]

What is a digi-ii? As in digifant 2? what is a Digifant 2? I have a 1991 Jetta A2 1.8 Carburettor? Can I do this?

The digifant II (2) and the carbed models are two different animals. In yours I would find a nice drop-in K&N filter for it unless you have done so already. Those filters might be hard to find to fit though, those car's seem rare.

[MKIIVR6]

What is a digi-ii? As in digifant 2? what is a Digifant 2? I have a 1991 Jetta A2 1.8 Carburettor? Can I do this?

The digifant II (2) and the carbed models are two different animals. In yours I would find a nice drop-in K&N filter for it unless you have done so already. Those filters might be hard to find to fit though, those car's seem rare.

[MKIIVR6]

I just did away with my enitre airbox, bought a K&N p-flow kit from ABD. Like it is stated earlier in this thread, minimal power increase, but mean sound. :twisted:

http://www.hostdub.com/albums/92VR6JETTA/DSCN0104.sized.jpg

[MKIIVR6]

I just did away with my enitre airbox, bought a K&N p-flow kit from ABD. Like it is stated earlier in this thread, minimal power increase, but mean sound. :twisted:

http://www.hostdub.com/albums/92VR6JETTA/DSCN0104.sized.jpg

[MKIIVR6]

I just did away with my enitre airbox, bought a K&N p-flow kit from ABD. Like it is stated earlier in this thread, minimal power increase, but mean sound. :twisted:

http://www.hostdub.com/albums/92VR6JETTA/DSCN0104.sized.jpg