Hello to all
If you are interested I can give you some test result we had in years 1996 to 1998 when doing similar test on track and on wind tunnel on VBM cars ( as you know very very close to GT 40 technics !)
We had lot of problem with heat on air coolers installed on rear engine bay and we tried to do similar scoops you are doing
We noticed that no best results where found with temp level and we had the opportunity to have wind tunnel session offered to understand what was happening : until rear engine compartment was not closed on behind there was flow under the car( velocity but not pressure) and due to wheels air movment this flow was not enought in compression to reach air scoops and go enouth in pression to puch onto radiators and result was poor !!
As soon as we built a floor with sides ( something like a diffusor with quite no angle) airscoop pressure intake was better but inside temp engine compartment increased ! so the effort into scoops was just enought to compensate that difference and track comportment of the chassis was changed and sometimes dangerous ( sudden oversteering on large curves !!
We understood taking various datas of air depression in various areas under the engine bay and under the gearbox ( trying to lower or lift the car ) that flow on these volumes what too much submit to variation and if not ducted from the forward part of the front floor it was very luky if we obtained good improvment on cooler efficiency
So we decided to go into top air scoop ( strangly on same time some famous GT 1 did same devlopment so we copy them !! and had good result)
Some years after working on modern LPM1 with big and efficient diffusor and very low ground clearance I tested to do some naca opening to ducts like yours and had very good result but infortunatly Le mans ACO rules do not allowed us to do so and I closed these holes!!
Hope this experiences will give you some info of what is happening to underflow air :shy:
If you are interested I can give you some test result we had in years 1996 to 1998 when doing similar test on track and on wind tunnel on VBM cars ( as you know very very close to GT 40 technics !)
We had lot of problem with heat on air coolers installed on rear engine bay and we tried to do similar scoops you are doing
We noticed that no best results where found with temp level and we had the opportunity to have wind tunnel session offered to understand what was happening : until rear engine compartment was not closed on behind there was flow under the car( velocity but not pressure) and due to wheels air movment this flow was not enought in compression to reach air scoops and go enouth in pression to puch onto radiators and result was poor !!
As soon as we built a floor with sides ( something like a diffusor with quite no angle) airscoop pressure intake was better but inside temp engine compartment increased ! so the effort into scoops was just enought to compensate that difference and track comportment of the chassis was changed and sometimes dangerous ( sudden oversteering on large curves !!
We understood taking various datas of air depression in various areas under the engine bay and under the gearbox ( trying to lower or lift the car ) that flow on these volumes what too much submit to variation and if not ducted from the forward part of the front floor it was very luky if we obtained good improvment on cooler efficiency
So we decided to go into top air scoop ( strangly on same time some famous GT 1 did same devlopment so we copy them !! and had good result)
Some years after working on modern LPM1 with big and efficient diffusor and very low ground clearance I tested to do some naca opening to ducts like yours and had very good result but infortunatly Le mans ACO rules do not allowed us to do so and I closed these holes!!
Hope this experiences will give you some info of what is happening to underflow air :shy:
