hi all has anyone lifted the back of there bonnet to let hot air out as ive done it with a few of my past cars but not shore with the s3. But as the turbo is at the back of the bay it should work ok
This is only useful when you're stationary, the way the air travels over the bonnet when moving doesn't let any air out. This is called the Venturi effect.
No it's not?! There is no fluid pressures involved for it to be classed as a venturi, the technical term is "**** airflow."
And guess where the ECU lives....Just be aware that removing the rubber and/or lifting the bonnet at the back allows water to enter the back of the engine bay... have seen corrosion etc as a result
<tuffty/>
The first reason for liftinG the bonnet was so u could shoe horn a bigger/taller engine in the bay without using differnt mounts
mainly civics with 2.2 engines
in summer i just take the seal out from the back of the bonnet just to let heat escape whilst moving slowly through traffic or whilst stationary. You can see the heat escaping. But it will only escape whilst stationary or not moving very fast.
this is the ****** who stuck fingers (if that's what there called on a seal) in my turbo compressor wheel! Bent 1 of my blades the f*cker!
This seal ?
base of your windscreen/top of bonnet is going to be area of high pressure when moving. Compared to lower pressure under the bonnet. Therefore its not going escape. Its debatable that cold air might go in thoughIt must have some effect whilst moving, hot air under the bonnet will have a higher pressure than the air flowing over the bonnet, the high presure air will want to go to the low pressure air, the gap at the back should act as a heat extractor. If you fit bonnet vents they dont force cold air into the engine they draw hot air out, some cars have vents in the wings, like the escort rs cosworth or clio 197/200 which work in the same manor. Although some cars do have a scoop like scoobys and GT4s that force air into the engine or intercooler on these cars.
If only you could mount the filter right up under the scuttle for that high pressure. Bit like the Gruppe M intakes for EP3`s having the scoop on the scuttle.
Just had to have a quick google on the Gruppe M kit for our 8L S3's.....
To say their having a laugh with the price is a huge understatement!
Buy Audi S3 8L 4WD 1999-03 Gruppe M Air Induction Kits | PPCGB
You couldn't be more wrong.
Base of windscreen is a high pressure area, not low, air will be drawn IN, not out by raising the back of the bonnet.
Don't do it. No gains.
Without stupidly minute testing, you could never answer that.
Based on the theories you could say the air going in would cool things. But who reeeaaally gives a **** for a few degrees