Well the reason I like the idea of drilling and tapping after bonding them in, is I'd like to be able to bond them in using Areldite 2014, and then put a couple of layers of carbon over the back and vac bag it. That way I've got the support of the carbon on the back too? 

Does that mean you are planning on having the threaded inserts on the inside of the tube not the outside? Would of thought that would have a negative effect on the air flow?

Warren

Carbon Copies Ltd

Yes. Won't affect flow at all, not with a 4" pipe at the velocity the air is moving. 

With respect I would disagree, but I have been wrong before

Warren

Carbon Copies Ltd

It is the same as having a sensor boss inside the pipe. Of course it's going to obstruct flow from a physics point of view, but realistically that flow isn't going to have much affect on the cars power. Might make 1 or 2 HP less, if that, but I'm no dyno queen  

Me neither   I did some airbox development with an engine tuner friend of mine and the boss position for sensors had quite an impact on the overall power figures, and the ability to map the thing correctly.

Warren

Carbon Copies Ltd

Interesting... What sort of differences were you seeing? With what sensors? I did some back to back testing on mine when I switched from MAF to MAP. The air flow meter had the sensor housing protruding into the middle of it, with easy more surface area than there would be with my 10mm fitting bonded onto the inside. There was 0.2hp difference between MAF and MAP, with everything else kept equal.  Given that the dyno reads slightly different every run, I can't even attribute that to the AFM itself. The air temperature probe on the other hand, had a huge affect on power levels. That needs to go as close to the inlet manifold as possible. 

'

Its some time ago now but if my memory is correct it was around 4 or 5bhp. That was a 2L Zetec running Suzuki GSXR TB's and Megasquirt. I can dig out the data if you are interested. The final figures with the new airbox were up around 8 bhp over the standard airbox/filter.

Carbon Copies Ltd

See I wouldn't be fussed about numbers like that. I know it shows improvements can be made, but it's not going to affect the my track times. Do you know what sort of dyno it was run on? Hub or roller? Bhp makes me think hub... In which case it's even less than what it seems. 

Old school rollers so that's at the wheels not the flywheel. I would have been glad of the extra 7 or 8 when I was racing. If it doesn't make a difference to your lap times then you haven't reached the limits of your current set up yet.

Carbon Copies Ltd