Two into one Cold Air Feed fitted

[UncleFester]

yes mate that is where your plan is foiled... from the MAF it goes straight down the tip to turbo, then back up over the engine down through the space below the offside headlamp, through the FMIC and back up to the intake manifold.
when they were designing it they must have realised it wasn't a great place to put things. it does seem like everything you want cold is at the back of the engine.
.

Question is, that flatened elbow pipe that sits in the drivers wheel arch looks fairly restrictive, is that something that can be replaced / rerouted? Does that fasten directly to the output from the turbo .... really can't see in there without removing the lower tray / putting the car up on ramps.

Having looked in the daylight, it looks like that flattened elbow connects to a metal pipe, am guessing that's the pipe that comes off the turbo so it's going to get pretty warm, would need a metal pipe to replace it with. Also looks like there's a fair bit of 'gunk' sat where that pipe connects to a rubber pipe which i'm guessing goes into the FMIC - if that's been leaking gunk is it fair to assume that it's been blocked in some way?

Looks like it's a bumper off job again, undo some clips and have a poke around to see what's there.

I'll email allards on monday and ask which bits their pipework kit replaces. Would be really handy if someone had a diagram of this!

 

[RobDon]

Looks a good setup, although you have to bear in mind that air exits the turbo at over 100 degrees C, so any cold of cold air feed doesn't make much difference at all to air entering the turbo, it's the intercooler that cools the air, on the Forge site it shows air entering the intercooler is 110 degrees C and it exits at 31!!!

Better idea is to point the cold air feeds from either side to each end tank of the intercooler.

 

[Icecavern]

Looks like a good job but I have to ask the question. Why have you gone to the effort of fitting the pipe on the opposite side as well? Surely you can't get 2 pipes worth of air down one pipe. I don't think you've got anything out of the second intake. But looks a top job anyway

 

[probee]

you might be right icecavern but my theory is rather than air being sucked from the pipe it is being rammed in.. i know if you ram enough air in it is like you have taken the restriction of the air filter away. the results seem to give some gains so i am happy. i would be happy just to make the car look even again from the front as a missing foglight leaves a big hole.

Robdon, i see what your saying and i realise at this time of year cold air is just a pipe dream, but surely if you can get a positive pressure in the filter you are on a winner. it must help the turbo spool up quicker as there is little resistance.

 

[probee]

1 Fault Found:
17956 - Boost Pressure Regulation Valve (N75): Open Circuit
P1548 - 35-10 - - - Intermittent


BUGGER!!!! why do faults like this make you happy... i always think.... YAY! that might mean the car should be quicker.

 

[probee]

Question is, that flatened elbow pipe that sits in the drivers wheel arch looks fairly restrictive, is that something that can be replaced / rerouted? Does that fasten directly to the output from the turbo .... really can't see in there without removing the lower tray / putting the car up on ramps.

Having looked in the daylight, it looks like that flattened elbow connects to a metal pipe, am guessing that's the pipe that comes off the turbo so it's going to get pretty warm, would need a metal pipe to replace it with. Also looks like there's a fair bit of 'gunk' sat where that pipe connects to a rubber pipe which i'm guessing goes into the FMIC - if that's been leaking gunk is it fair to assume that it's been blocked in some way?

Looks like it's a bumper off job again, undo some clips and have a poke around to see what's there.

I'll email allards on monday and ask which bits their pipework kit replaces. Would be really handy if someone had a diagram of this!

we'll have to have a look at yours at the next meet mate. maybe i could make you a new piece of pipe to do away with the restriction. i have a new MAF housing in the making too but i'm not too sure if i will use it.... it does look nice though..

 

[UncleFester]

I'll install Elsawin on the tablet and bring it down to the pub, then you can have a look at yours in more detail in the comfort of the pub

http://www.seatcupra.net/forums/showthread.php?t=131074

On the first diagram it's the following pipe that i don't like.

5. Overpressure air tube ◆ Intercooler/turbocompressor union tube

The above shows the Tdi FMIC and pipework in more detail than i can explain or see without taking it to bits

 

[probee]

that does look extremely restrictive. do you think that these restrictions are meant to be our system or they're just numpties?

you'll nee to have a measure up on diameters and then i can see if we have any elbows and bits and pieces lying around.

 

[UncleFester]

I am pretty sure there's an allard kit to replace that pipe, going to ring them tomorrow and check which parts of the OE system their upgrade parts replace.

As for why it was designed that way, i don't have the mechanical knowledge to know why ..... or if there was any valid reason at all other than making it fit the space.

 

[probee]

space is probably the answer...........

would be good to see what benefits you get from the Allard kit.. keep us posted mate.

 

[Fl@pper]

looks liek its been made to fit a gap hopefully will find its volume is the same despite its shape - flattened so to speak - but then the petrol TIP is a similar shape and thats found to be restrictive

it's on the blow side of the turbo so could well be

 

[probee]

god the filter jams quick. been a month or so since i last cleaned it and check this out!!!!

 

[UncleFester]

Funny that, looks like exactly what i shook out of mine last week!

 

[probee]

Lol i just got an airline on it.. its not too much of an arseache to clean it, is it.

 

[UncleFester]

I just banged mine against the gatepost .... next doors

 

[karlosR]

probee, you've got PM mate

 

[Mitchy]

I have always had a problem understanding temperature of air through a TC engine.

If air is coming out of turbo at 110c and then intake temps of 30c, thats an 80c reduction in temp caused by the intercooler.

However if air leaving the turbo is at 100c, does the intake temps then drop to 20c, or do they remain at 30c.

The thing is, proof is in the pudding performance wise summer vs winter so temperature of air going in DOES make a difference, or is it the IC is just more efficient in winter?

Volume, Pressure and temperature are related scientifically so does 20c inlet pressurised to 1.5bar have the same outlet temp as 30c inlet pressurised to same 1.5bar

Who knows, my mind boggles with this topic and ive never managed ever to get a definitive answer other than just speculation!

It must do though as colder, more denser air as there is in the cooler months makes the car perform better than it will be just now in July. Or is it just down to the IC being more efficient, with colder airflow passing over and through it

 

[probee]

LOL..... Thats a big can of confusing worms... someone must know the answer.

 

[RobDon]

Could well be the cold winter air is cooling down the metal intercooler far better than warm summer air. Whatever the weather is the air exiting the turbo is always 100+ degrees because the turbo is powered by exhaust gasses, I doubt it matters whether it's 120 or 130 degrees, it's all down to the intercooler to reduce the temps.

 

[jonjay]

Could well be the cold winter air is cooling down the metal intercooler far better than warm summer air. Whatever the weather is the air exiting the turbo is always 100+ degrees because the turbo is powered by exhaust gasses, I doubt it matters whether it's 120 or 130 degrees, it's all down to the intercooler to reduce the temps.

I am correct in thinking then the bigger/better the intercooler you could better performance? For example, for TDI 150PD cars, the FMIC is good for 300BHP however if I get a better FMIC, car will be cooler = better performance??????