mgf airfow

about five years ago I was able to ask a good friend of mine to find out how and where the air flows around an mgf /tf.
The mgf isnt that good with diecting air flow im afraid.in fact it act like an aircraft wing and at over 125 mph starts to lift,flat underside curved top.She is too high for ground effect down force.the air from the underside of the car is highly disturbed and therefor unsuitable for induction.the side vents are in a air void.air is pushed out of the way by the bumpers and deflected,the front wheel cause turblance and the vents are in very low pressure dirty air and wet when it is raining,so they are of no use.
So im afraid there was three ways to get cold undisturbed air into the engine,
from the front.move rad into the rear and put pipes down where the water used to go.Or make a intake that sits on the rear boot above the front window line,that is the only place cold undisturbed air can be found at speeds above 50 mph.
Every thing else is just not worth doing,you may as well fit a filter direct to the trottle body.
I was surprised at the findings,but when air hits at 50 mph it deflects,it causes low pressure and high pressure,
Hence why a lorry can drag a car along if it sits in the right place,too far forward or back the car gets thrown about.Also air that is in turbulance cant be forced easly up a tube.
Also under the car.there is a small deflector near the rad,that helps reduce air under the car.to stop lift,the air around under the engine is almost zero pressure.the air circulates under the car and isnt directed.
F1 cars really use air in a big way,they reduce the turbulance leaving the car so it reduces dray,the water and air vents air place perfect for the job they need to do.
My good friend simply said,there is nothing you can do to an mgf to improve either its air intake of high speed air flow,air from the side will help a small amount.But just a small amount.
He has worked in F1 for a number of years and I was very lucky to have him look at an mgf for me,we where involed with racing these cars and wanted an advantage.He simply said.its an mgf not a race car,dont confuse them

Thanks for all that info Daz - very informative. :yesnod:

When I did the research before changing mine it was all about increased, and colder, air for the engine. As I'm sure you know the Mk1 intake system isn't the best and was greatly improved with the later re-design.

A lot of info I found suggsted that the performance gains were substantial on a Mk1 only due to the above. I believe that the same kit on later models has a substantially lesser effect.

And I understand that the kit I fitted is not induction, just a lot better than what I had before :thumbsup:

getting rid of the metro filter is the best improvement.and thats as far as it is,the car isnt strimlined enough to slip through the air,so it causes a lot of turbulance,the gains are very small,but in the end they are fun cars and does it really matter if the air is a problem.
If we got 0 to 60 in 6 sec the car wouldnt hold the road.