forge twintake air intake available end Aug 09

[RedRobin]

The flow figures will not be accurate unless the MAF housing size is set correctly!  The MAF tables are calibrated to the OEM MAF housing size therefore if you change the size of the MAF housing the reading will not be accurate.  So if Forge do not have a MAF housing ID of 67mm (I do not know what the ID is on the twintake) the figures will be skewed just as they are for any other intake with incorrect MAF housing sizes.

....Therefore some questions to Mike @ Forge across the pond : -

RR to Forge : - The oem MAF housing size is apparently 67mm dia and I think I've read that yours is 70mm. As the ECU isn't dynamically SMART and runs according to oem preset calibration tables (all over my head!), how does this not adversely effect things?

Reply : - "The OEM MAF housing incorporated into the stock intake/airbox assembly is actually ovoid in shape and is roughly equivalent to just under 70mm(inside diameter). The piping we use is 70mm (outside diameter). Once you factor in the wall thickness of the pipe, this is as close as we can get to the stock MAF size, and it's virtually identical. This is the same size piping we've been using in all of our 2.0T specific intakes for years now. There are no issues with MAF calibrations whatsoever."

RR to Forge : - If someone modified the Twintake's metal duct end behind the headlight and fed a hose from an air inlet below (foglight panel for example), would that be likely to upset the Twintake's function? Doubtless you may ask why do such a thing. Is there such a problem as having too much air?

Reply : - "I have thought about trying this myself, however, there are some plastic pieces that protrude forward from the bottom of the battery tray that sit just below this carbon cannister, and prevent the cannister from being angled downwards to facilitate this. Unfortunately, the terminal end of this cannister also sits so far towards the inner fender/wing that you would not be able to easily bend any ducting down without kinking it either. It may be possible to do some modifications such as cutting off these plastic pieces of the batter tray to help accomplish this this, but I haven't yet had a chance to try it myself."

Very good to learn that the MAF housing size is 'safe' on the Twintake. ITG not the only ones to achieve this then.

Interesting too that Mike (who likes to mod) is interested in the extra air feed idea.
 

[KRL]

Thanks RR, some good info there.  So we now have three intakes that with the correct MAF housing :) 

[RedRobin]

Thanks RR, some good info there. 

So we now have three intakes that with the correct MAF housing :) 

....My pleasure

I've forgotten which the third is : -

1 - ITG
2 - Forge Twintake
3 - ?

[cuprak1]

BSH?

[nwhiteley]

Thanks RR, some good info there. 

So we now have three intakes that with the correct MAF housing :) 

....My pleasure

I've forgotten which the third is : -

1 - ITG
2 - Forge Twintake
3 - ?

BSH?

[RedRobin]

^^^^
So we think it's BSH, but do we know for certain?

Any others that peeps know of?

Obviously Carbonio uses oem airbox so is MAF-friendly. Also GruppeM.

[KRL]

Yes the BSH is 67mm throughout 

[RedRobin]

^^^^
Cheers, KRL  

On the subject of trying to feed more air to the Twintake's 'side' filter currently behind the headlight: I've now heard of a guy who says he has done it. AND he has OSIR carbon foglight panels (NeilM The Dremelist take note). I'm waiting for more info and hopefully pics and will post here accordingly - I'll probably start a new thread under How-To and link it from here.

Mike @ Forge is also very interested to see our efforts and says he may try it himself if we don't.

[KRL]

Fitting unstruction for the twintake can be found here:
http://www.forgemotorsport.com/media/TWINtake.pdf

[john_o]

the twintake doesnt have a fixing bracket on the RHS next to engine ficing it to the block (when viewing from the front looking to back of car) which the ITG does.
Is this a good or a bad thing ? 
and would anyone buying it want to enhance the kit with an additional bracket?

[KRL]

I guess it depends on how securely fixed it is by the other brackets.  Without engine mounts the engine will move a lot so maybe this is why they have not attached it to the block as the engine movement could cause problems for the other fixings as well?

[RedRobin]

the twintake doesnt have a fixing bracket on the RHS next to engine ficing it to the block (when viewing from the front looking to back of car) which the ITG does.

Is this a good or a bad thing ? 

and would anyone buying it want to enhance the kit with an additional bracket?

....The Twintake pipework is made up of less components and joins than the ITG, and so I wonder if this is a factor making an additional bracket possibly unnecessary. Or, will we find it necessary? I don't think jonnyc did on the prototype he had for months.

[john_o]

I would have thought the number of joins isnt really a factor, as its still a single long piece from MAF to filters.
but I dont know? thats why I have asked...

[RedRobin]

^^^^
Well, I'm not sure about the joins factor either (why I wrote "I wonder") but logically more joins = more opportunities for flexing/movement < Just thinking aloud and offering suggestions.

EDIT: I've just checked out the ITG pipework - There are massive flexible silicone hoses either side of the bracketed short metal pipe run - That whole section would definitely benefit from anchoring!

[gazbutS3]

the flex in the silicon hoses is a good thing as the we know the engine moves around alot, so some "give" is needed from somewhere. If the intake was mounted rigidly to the car body and the intake rigidly to the engine it would be long before something gave way