1.8T laggy after intake install

[2000blk1.8t]

I did the emissions delete on my 2003 b6. Instead of plugging the SAI port in the air box I decided to build an intake. When I first fired up the car it wouldn't hardly run. peddling the gas pedal wouldn't really help at all. I unplugged the MAF sensor and it would idle fine. After restarting it a few times I got it to run ok. Now, its really laggy. once it finally winds up it takes off like a rocket, but the throttle response is horrible. did I mess something up building the intake? its all 3 inch. I built a 2.5 inch intake for my 2000 passat 1.8T and had no issues at all.

[jpulll]

you need a tune for the 3" piping. the maf isn't adjusted for the increased volume of airflow.

[Seerlah]

^This.

And to add, the 90 degree elbow isn't the best or even right way to go about it. Make a new intake using the the stock maf. For one, it is the right size. Second, you want air straight through versus a bend. Third, the stock maf has a mesh on it designed to break up the airflow for the sensor to take more accurate measurements. In a nutshell, your maf sensor design is what is causing your problems.

Just put the stock box back in. You aren't gaining anything with an intake on the stock turbo. Stock box flows plenty.

[PreciseD]

A MAF needs a certain amount of straight piping before and after it. Remove that hot air intake you made and put the stock air box back in.

[nitronutz]

X2 on the stock airbox. However that is a nice looking intake for a home made job!

[2000blk1.8t]

huh. guess I'll put the stock air box on. I guess diesel stuff and gas stuff dont mix well. I'm running my MAF sensor in the middle of a 90 on my twin turbo 650 HP duramax diesel. No issues at all. Although I do have the MAF sensor re calibrated, but I'm running a 5 inch intake. almost twice the size of the stock intake. I didnt figure .25 inches of extra air would make that much of a difference.

[Furly]

It's an audi not a diesel truck.
And as precise said, you've made yourself a hot air intake. Which is kinda counter productive. The whole point of an intake is to draw in colder air. Not 900 degree air from right next to the turbo and exhaust.

[nitronutz]

It's an audi not a diesel truck.
And as precise said, you've made yourself a hot air intake. Which is kinda counter productive. The whole point of an intake is to draw in colder air. Not 900 degree air from right next to the turbo and exhaust.

Lol. Well said.

[2000blk1.8t]

got it. thanks guys. Obviously the worst idea ever. Runs fine with the stock air box.

[customa4]

I ran an AFE "cold air intake" for a while designed for the B6. The car ran much better when I went back to the stock airbox.

[Furly]

Cold air intakes are only necessary for big turbo setups that require removal of the factory air box due to fitment issues.
I have a top mounted big turbo and there is no way the air box will fit. So I made a custom cold air intake that goes down into the lower side grille to draw in cold air. But it's sketchy so I have to make a separate setup for when it rains. Do not want to suck water into the engine. But otherwise yes keep your stock air box if you can.

[PreciseD]

Cold air intakes are only necessary for big turbo setups that require removal of the factory air box due to fitment issues.
I have a top mounted big turbo and there is no way the air box will fit. So I made a custom cold air intake that goes down into the lower side grille to draw in cold air. But it's sketchy so I have to make a separate setup for when it rains. Do not want to suck water into the engine. But otherwise yes keep your stock air box if you can.

If you remove your battery you could run an intake tube into there and it would suck cold air from a low pressure zone all day long. I was thinking about do this but since my car will not be driven in the rain I opted for a traditional location.

[nitronutz]

got it. thanks guys. Obviously the worst idea ever. Runs fine with the stock air box.

I will give u props for craftsmanship though. That intake looks almost pro. Nice fitment.

[Seerlah]

Cold air intakes are only necessary for big turbo setups that require removal of the factory air box due to fitment issues.
I have a top mounted big turbo and there is no way the air box will fit. So I made a custom cold air intake that goes down into the lower side grille to draw in cold air. But it's sketchy so I have to make a separate setup for when it rains. Do not want to suck water into the engine. But otherwise yes keep your stock air box if you can.

Look into prefilters. Won't help you if fully submerged, but look into it. Cheap on ebay. I have a setup I never used (will eventually) with a prefilter (amsoil heat shield, amsoil dry filter, and amsoil prefilter).

[Furly]

If you remove your battery you could run an intake tube into there and it would suck cold air from a low pressure zone all day long. I was thinking about do this but since my car will not be driven in the rain I opted for a traditional location.

Would one have to relocate the battery? That sounds like a good idea though.

BTW you see the progress pics? :D so close.

- - - Updated - - -

Look into prefilters. Won't help you if fully submerged, but look into it. Cheap on ebay. I have a setup I never used (will eventually) with a prefilter (amsoil heat shield, amsoil dry filter, and amsoil prefilter).

Thanks man I'll look into that as well.

[PreciseD]

Would one have to relocate the battery? That sounds like a good idea though.

BTW you see the progress pics? :D so close

Yeah I put mine in the trunk to make room for my 034 enclosed fuel cell/pump

No I haven't seen them yet. I'll look for it.

[Arnie91]

I tried running a custom heat shield from aluminium and larva grade heat wrap, along with a BMC CDA high performance air filter for 1.8l engines and I had all sorts of problems, mainly to do with MAF which was causing the turbo to run very slow. It was a PITA and ended up removing it. Always wanted a CAI though, the stock box is ugly as fug.

At first you could tell the turbo was a lot more responsive and crisp, try running a forge MAF Pipe or the MAF from the stock box, which can detach, and connect that in between the filter and the TIP. I still had a problem with a cone filter and CAI filter.

[2000blk1.8t]

I will give u props for craftsmanship though. That intake looks almost pro. Nice fitment.

thanks. I have had a decent amount of practice. I built the twin kit for my truck and also built a turbo kit for my Polaris RZR 800. You could say im addicted to boost truck runs about 55 PSI.

[GrapeBandit]

did I mess something up building the intake?

no, all properly designed cold air intakes for turbo cars place the plastic MAF directly over the hot turbine housing lol