Fiddling about with my kit car- some ideas.

[aerohead]

Originally Posted by jondoeclsm

I was removing the old shocks on the rear today and had to make a small hole in the rear of the wheel arch in the boot space.. this got me thinking, would the rear wheels benefit from venting them inside the boot space and letting that air out of the vertical rear which is the boot?

My thoughts are that it may be beneficial as the very low pressure at the rear could be 'fed' from the wheel arches.

Also a lot of race cars now use vents rear of the front wheels, this would be a vent at the rear of the rear wheels.

*The rear of the wheelhouse is almost to the back of the car,so the pressures would be very similar and might not induce any flow if you opened up a channel.
*Also,the turbulence behind the back of the rear tires is already part of the wake which would really frustrate any induced flow.
*Ducting air inside the body would itself induce surface friction.
*The Ferrari 599XX race car does use ducting,but uses dual,high -static- pressure blowers to induce pulsed flow out the taillight openings.They claim that they can detach the wake this way.
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[jondoeclsm]

Ok, thank you again.

I am working towards a load of improvements on the car. My other firecat is a tuned 1.3 turbo and my aim is to reduce track time from the terrible 1min 33 I was doing down to 1 min 25 through
aero mods,
significant suspension mods,
tuning the 1.4 turbo to go a little further than the tuned 1.3 and
getting my driving better with that car which not only had I not got to grips with but also I am currently under the impression I have never turned in fast enough and I need to work on my braking too.
All important aspects. I hope the aero can give me 5 of the 8, the last 3 will be very hard. Not just to reduced drag on the aero front but also being able to corner harder and brake later.

[deejaaa]

if I read it right, you are using timed acceleration and rpm to measure improvements.
most I've seen is either mpg and rolling distance.
what is the benefit to using your method and where did you get the idea for it?

[jondoeclsm]

Yes, sorry about that, its not driven enough for the mpg tests and the driving of it is very mixed between completely calm and flat out. These figures will change with the boost change and tuning.
I dont know a good place for a coast down test. It is tested at higher speeds where it suffers the most.

[jondoeclsm]

Not sure where I got the idea. I needed to avoid gear changes and only be on full throttle.
Using the speedo varies on which wheels are used, so it could become out of gear range if I chose a speed range.