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Shall be fitting a Dave F this weekend (yes replacing the Alta:cursing:) Quick question, I take it I will have to refit the plastics engine bay/bulkhead divider, but will i have to cut a hole in it to provide direct flow into the back of the Dave F or does the OE hole do the job?
 

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** stupid question alert ** - what size hole needs to be drilled in the bulkhead please? I have 2 already drilled and they measure 60mm each, I was wondering if it's had something similar on it before ???







Any help greatfully received
 

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To drag this one back up.

I fitted my Dave F last night.

I drilled the back panel with the required 75mm saw.

The hole is pretty much cock on, however.

I trust the hole is to assist air flow at the rear and not for the purpose of the filter cone to stick through, as mine doesn't, if someone could confirm?
 

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The cone/tube in the back should indeed go though the hole in the firewall that you have drilled with the hole saw. You should have a foam ring too that sticks around the hole to make it look pretty.

This drags more air through the back at higher revs.
 

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Ok, thanks for that I'll whip the top off again later and try and angle it through.

On the alta, bad word on here I know, the plastic panel was removed completely.

I know the Dave f is geared up to be more stock/effective, but surely you'd get more air through not having it there at all?
 

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You'll need to post a pic.

It's better to keep the plastic panel/firewall with the hole in it as it stops the engine heat getting to the air filter.

More hot air, lower power. Nice hole to scuttle, nice cold air, more power!!!
 
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