Holes in bumper for air flow.

[jsdvtr]

Im wanting to put holes in front bumper where number plate goes, how is the best way to do this? I will probably mesh it too behind holes. It for looks and better air flow to rad tbh but will be turboing in the future also.

[Tom5190]

Im wanting to put holes in front bumper where number plate goes, how is the best way to do this? I will probably mesh it too behind holes. It for looks and better air flow to rad tbh but will be turboing in the future also.

take the bumper off then use a drill with the correct diametre peice

[Tontsy]

ooh i like the sound of this idea, certain styling on certain car... hmm could look good.

just get a drill piece the size you want the holes to be, then ahoy!
i want to do it now lol. pics once done. :y:

[Ryan]

what alot of people forget is that sometimes doing mods like this can increase drag.

[sexy_gt]

i did to my old xsi
http://img.photobucket.com/albums/v212/sexy_gt/106/caddie6.jpg

http://img.photobucket.com/albums/v212/sexy_gt/106/waxed013.jpg

[Tontsy]

what alot of people forget is that sometimes doing mods like this can increase drag.

but isnt that why people do it in the rear bumper to help the air flow out again easier?

looks smart from the post above!
sod the drag tbh...

[sexy_gt]

what alot of people forget is that sometimes doing mods like this can increase drag.

yes. ive done this, most recent mod (the foglights)
http://img.photobucket.com/albums/v212/sexy_gt/saxo%20vts/saxo083.jpg

[sexy_gt]

i did that to my xsi as it ran near overheat (new nissens rad) on track. after the holes 52mm ;) it ran just over half.

problem was its a s1 shell with a s2 engine. s1 engine bay a bit shorter than s2 hence manifold sat mm from the radiator :(

[Ryan]

but isnt that why people do it in the rear bumper to help the air flow out again easier?

looks smart from the post above!
sod the drag tbh...

How do you get air which is stuck in the engine bay out by cutting the bumper ;)

This was a few points made by indepth discussions a while ago elsewhere, say you massively increase the air into the engine bay, how do you increase it leaving, considering the bulkhead is a solid verticle wall.

[sexy_gt]

raise bonnet ;)

p.s had to do it to my old car. cheap raceland brace wouldnt let the bonnet shut. not a fan.

[Asherz86]

it will increase drag

air will not flow smoothly. hence why euro`s cars which are smooth on front end with no creveses dont have as much drag as air flows over the car better

just look at a nascar bodywork is so smoothto produces less drag so drafting is improved,mpg is improved.

[Tontsy]

How do you get air which is stuck in the engine bay out by cutting the bumper ;)

This was a few points made by indepth discussions a while ago elsewhere, say you massively increase the air into the engine bay, how do you increase it leaving, considering the bulkhead is a solid verticle wall.

ifail...

cut the bulkhead, and have the air blowing on your feet too :homme: silly!
everyone wants cooler feet in the summer!

but serioulsy, good point made.

[Ryan]

it will increase drag

air will not flow smoothly. hence why euro`s cars which are smooth on front end with no creveses dont have as much drag as air flows over the car better

just look at a nascar bodywork is so smoothto produces less drag so drafting is improved,mpg is improved.

Nascars still run extensive aero packages, its not as simple as that. A flat undertray aswell as the use of splitters and so forth.

the Main point there is the front grill section though, often teams tape up the grill for aero purposes, however have to make sure they dont overtape it and end up with not any cooling for the engine.

[NICK2506]

just make sure you line the holes up before you start drilling!

[jsdvtr]

What size holes and how many do you reckon should i go for?

[sexy_gt]

mine was 52mm.

[KamRacing]

How do you get air which is stuck in the engine bay out by cutting the bumper ;)

This was a few points made by indepth discussions a while ago elsewhere, say you massively increase the air into the engine bay, how do you increase it leaving, considering the bulkhead is a solid verticle wall.

have to agree with you here Ryan.. air should be ducted in and ducted out. There is no inbetween

Raising bonnets at the back is not a solution either.. in most cases it makes the turbulance worse

[jsdvtr]

How big and how many holes should i do? I was thinking of getting a square number plate as getting rid of the original place for it.

[swampy]

Nah square plates are gay
get a standerd one and mount it low down in the centre.
I have this on my 306 and looks sweet.
I also smoothed the recess in the bumper as the 306 has a metal bar behind it.
I also have a tiny plate behind the standerd one which looks even better as long as i avoid old bill!