Bogging at 4000 rpm

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Bogging at 4000 rpm

Post by philhoward » Fri Dec 15, 2017 5:40 pm

I reckon you need about 75-80l/hour for 200bhp - I have a 90l/hr pump and it copes with 212bhp even when that was running rich (11:1) at 3 bar.

As long as you get over a litre/min at the fuel rail, that should be fine.

I’m also running 8mm fuel line in nylon.

Black residue does sound like broken down rubber hose though..


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Bogging at 4000 rpm

Post by Coupe Racing » Fri Dec 15, 2017 6:47 pm

DARK STAR wrote:
Fri Dec 15, 2017 5:30 pm
It was the feed pipe to the regulator Steve.
The pressure put out by the pump is 4 litres per minute, the (clean) filter shouldn't reduce that but the pipe run seems to.
I'll check the actual flow at the regulator tomorrow.
But the question is how much petrol should be feeding the regulator so that it can create the necessary pressure ?
If I had the slightest idea how to convert flow rate into pressure it might help 8)
Flow rate is required to feed the volume of fuel required at the injectors , not to create pressure.
That’s the job of the regulator.
As a temporary measure you can progressively clamp the fuel return hose to create pressure however don’t close the pipe completely as the fuel will all go through the injectors and run very rich
Last edited by Coupe Racing on Mon Jan 01, 2018 4:37 am, edited 1 time in total.


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Bogging at 4000 rpm

Post by DARK STAR » Fri Dec 15, 2017 7:10 pm

Sounds promising.
This was obviously the original problem (as I suspected :wink: ) before the relay failure took me off at a tangent.
I don't think the braided hoses would be breaking down - but I can't remember if there is still some old Ford hose before the 12mm-8mm adaptor ...


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Bogging at 4000 rpm

Post by DARK STAR » Sun Dec 31, 2017 4:41 pm

To update, the car has been running very well in normal use but it wasn't until today that I finally had an opportunity to push it a bit :twisted:
It is pretty impressive BUT still hesitant on full throttle once over 5000 rpm.
I think I'd better change the fuel feed hoses, I tend to think everything is new on the car but when I checked they are 7 years old.
They are Demon Tweeks' finest stainless braided with fancy hose clips (one broken ages ago :? ) and I only ever use 98 octane ethanol-free from expensive filling stations but they are probably rotten inside as Phil suggested.
A drop in flow rate of nearly 50% from back to front of the car doesn't seem normal - and I believe the nylon pipe is beyond reproach?
Has anyone a recommendation for decent quality fuel hose? Preferably pretty for my Cheshire engine bay (it's only the engine bay, don't worry)


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Bogging at 4000 rpm

Post by philhoward » Sun Dec 31, 2017 4:45 pm

Speak to your ECU supplier for hose ;)


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Bogging at 4000 rpm

Post by DARK STAR » Sun Dec 31, 2017 4:59 pm

Andy has gone quiet (and in fact I sent his ECU back but kept the fault code reader)
Gloucester's not in Cheshire, is it?


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Bogging at 4000 rpm

Post by efi_sprintgte » Sun Dec 31, 2017 5:34 pm

I strongly recommend against braided fuel hoses, I have had nothing but trouble over the years.


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Bogging at 4000 rpm

Post by scimjim » Sun Dec 31, 2017 11:34 pm

DARK STAR wrote:
Sun Dec 31, 2017 4:59 pm
Andy has gone quiet (and in fact I sent his ECU back but kept the fault code reader)
Gloucester's not in Cheshire, is it?
I think Andy may be mid house move.



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Bogging at 4000 rpm

Post by DARK STAR » Sat Jan 06, 2018 7:56 am

Looking at availability I am amazed that resistant-to-everything-last-forever Teflon hoses are among the cheapest.
BUT Demon Tweeks insist that one must use special collet clips instead of the fancy hose clips I already have, which would add about 150 sterling to the price :shock:
Is this true, or just a marketing ploy?


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Bogging at 4000 rpm

Post by Roger Pennington » Sat Jan 06, 2018 1:29 pm

DARK STAR wrote:
Sat Jan 06, 2018 7:56 am
Looking at availability I am amazed that resistant-to-everything-last-forever Teflon hoses are among the cheapest.
BUT Demon Tweeks insist that one must use special collet clips instead of the fancy hose clips I already have, which would add about 150 sterling to the price :shock:
Is this true, or just a marketing ploy?
any chance of some links, so we can see exactly which ones you're referring to?


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Bogging at 4000 rpm

Post by AJL Electronics » Sat Jan 06, 2018 1:37 pm

Why don't you just order it from my webshop?

http://ajlelectronics.co.uk/epages/8323 ... s/BIOHOSE8


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Bogging at 4000 rpm

Post by DARK STAR » Sat Jan 06, 2018 2:57 pm

Welcome back Andy :lol:
What is minimum bend radius because of course Ford fit everything backwards and most of the connections have to turn 180º ?
This the Teflon stuff ... https://www.demon-tweeks.co.uk/performa ... -overbraid

Photo of one end of the installation
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Bogging at 4000 rpm

Post by DARK STAR » Fri Jan 12, 2018 2:09 pm

Still no comment on clamps for braided Teflon hoses ?

Meantime I have found a few metres of Gates 8225 hose in the garage, is this any good ?


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Bogging at 4000 rpm

Post by philhoward » Fri Jan 12, 2018 2:21 pm

The only time you'd use telfon hoses is with swaged ends - they're not designed to deform to use "normal" clamps.

No clue on the Gates hose - a google doesn't come up with anything either?


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Bogging at 4000 rpm

Post by DARK STAR » Fri Jan 12, 2018 2:33 pm

That was a challenge, Phil 8)
I found it !

So I may not need to buy any ...
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