So is that a ZS you were chasing? He's not a very good driver, or that car
doesn't handle well. He certainly had horsepower on you though. If you could
have gotten around him, just after the long straight, you probably could have
gotten some decent separation on all the turns before the next lap.
I think you want to find out the temperature under the hood. If it is very hot
under there you could be getting vapor lock.
But start at the Paul Hunt beginning, measure your flow from the fuel pump.
The stutters didn't take place at (or just after) hard cornering, so I doubt
it's starvation. But then what do I know? Do you have a baffled tank? It's not
a fuel cell is it?
It's amazing how little safety equipment you have compared to the SCCA here in
the US.
On Apr 7, 2010, at 1:10 PM, Eric Erickson wrote:
> Following on from my previous post, this video shows me up against a
slightly
> more modern, more powerful MG - and not doing such a bad job (although
> modifying my lines like I thought I could outgun him out of the corners was
> not real smart).
>
> BUT my biggest issue that day came with the engine running out of fuel at
> critical moments. Stuttering and stumbling (yes, I have annotated the
video
> to point out the obvious) in both third and fourth gear after a couple of
> laps.
>
> When I got off the track and popped the bonnet I immediately saw that the
> fuel-filter was empty. I pulled off the fuel line and started up the
pump...
> and it pumped fuel. There was plenty of fuel in the tank (in fact, thinking
I
> was low on fuel, I slightly over-filled it and it did exactly the same
> thing).
>
> There were two possibilities that came to mind (you may have others).
>
> 1. It was hot day (made worse by humidity) at 33C/91F+ - so I was thinking
> vapourisation/vapour-lock, but I have run in hotter weather and never
suffered
> this issue before.
>
> 2. This engine is bigger than it has ever been at 1950cc with the same SU
> fuel pump as when she was 1840cc - could I need a higher capacity fuel
pump?
>
> Any thoughts? How should I be measuring fuel flow at 5000+ revs (which is
> when she stuttered and stumbled)?
>
> And the video.....
>
> http://www.youtube.com/watch?v=L5w47B6QN4Q
>
>
> Thoughts?
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