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Sounds great, James. How much louder is it when starting cold and idling out of your driveway? I'd love a Tubi, but I'm worried it will annoy my neighbours. Any thoughts on this?
 

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Discussion Starter #5
mhh said:
Sounds great, James. How much louder is it when starting cold and idling out of your driveway? I'd love a Tubi, but I'm worried it will annoy my neighbours. Any thoughts on this?
From cold its VERY loud. I've just bought a new house and its a very quiet area. I started the car up on Sunday morning and you could almost hear the neighbours falling out of bed all around me. Seriously though it does quieten down after the engines warm, but for those first few mins you do feel a little self conscious. I had to sit in the car and close the windows to hide the shame...
 

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Nice one Racer!

James, I'm not an expert in these matters - and others here will be, but here goes....

In my motorcycling days I eventually traded up to a Kawasaki Z1100 and considered putting a special exhaust on it. However I heard so many tales of 'incorrect back pressures' on the valves causing the exhaust valves to burn out and other such horrors that I decided against it.

Is there any risk on these highly tuned, multiple valved engines that these special exhausts would cause any issues with the valves?
 

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Discussion Starter #8
neilda said:
Nice one Racer!

James, I'm not an expert in these matters - and others here will be, but here goes....

In my motorcycling days I eventually traded up to a Kawasaki Z1100 and considered putting a special exhaust on it. However I heard so many tales of 'incorrect back pressures' on the valves causing the exhaust valves to burn out and other such horrors that I decided against it.

Is there any risk on these highly tuned, multiple valved engines that these special exhausts would cause any issues with the valves?
Ahhh don't start telling me stories like that!!! Just when i was starting to relax about the car too. ;)

Seriously though is there anyone here that can shed some more light on the causes of back fires?

Incidentally, my father has a GTD 40 running a TVR 5.0 engine that has been heavily modified. The exhaust is custom built and that also pops and bangs like crazy. You even get the occasional flame.
 

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James
A mate of mine has a TVR Cerbera and that pops and bangs all the time. Great sound, just like Lambos!

Steve
 

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Discussion Starter #10
Yeah im fairly sure its nothing to worry about. The general opinion seems to be that its just the unburnt fuel igniting on the exhaust tips. Tubi have been in business long enough to know what theyre talking about. But always worth checking out concerns like that as making a mistake could end up expensive.
 

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Back fires are usually caused on the overun, especially when the mixture is slightly weak. The unburnt fuel not used in compression is ejected, as it is slightlñy lean it forms the perfect mixture in the exhaust, unburnt fuel and flam from the rest of the exhaust = pop pop !!

My Countach throws flames out at night going down hills or when I come off the power at speed at night, the Spanish love it ( so do I )
 

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Discussion Starter #12
terryjoint said:
Back fires are usually caused on the overun, especially when the mixture is slightly weak. The unburnt fuel not used in compression is ejected, as it is slightlñy lean it forms the perfect mixture in the exhaust, unburnt fuel and flam from the rest of the exhaust = pop pop !!

My Countach throws flames out at night going down hills or when I come off the power at speed at night, the Spanish love it ( so do I )
I want flames!!!
 
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