Evening, just got back from a rolling road session and the guy said that the fuel pump is a little underpowered. He said it should be OK for road use but if I take it on the track it won't be able to supply enough fuel. As it happens I have a track day booked next Saturday..

2 litre black top zetec with ZX9R carbs and megajolt. Power was 144 hp. Pump, if I remember correctly, was a second hand ZX9R pump which I thought would be OK.

Can anyone recommend a more suitable pump?

Hi,

I run R1 carbs with a "square" Facet pump, pressure set at between 1.5 & 2.0psi.

Had no problems.

Mondeo Blacktop all std ecxept ex manifold & megajolt.

Pulls hard from idle to self imposed redline @ 7500, 170bhp

I prefer the Huco pump sold by webcon. It's bassed on the old su pump.

Cheers, does that just go in the fuel line like the bike pump and does it need a separate regulator?

Also does it switch off automatically when the carbs are full?

More importantly, how did you get 170hp!? Mine was 144 @5300 rpm

The Huco pump needs no regulator. Fits in the engine bay and pulls the fuel from the tank.

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Originally posted by big_wasa
The Huco pump needs no regulator. Fits in the engine bay and pulls the fuel from the tank.

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Why swap from the bike pump?

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Originally posted by Skirrow
Cheers, does that just go in the fuel line like the bike pump and does it need a separate regulator?

Also does it switch off automatically when the carbs are full?

More importantly, how did you get 170hp!? Mine was 144 @5300 rpm

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quote:

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Originally posted by SJ
Why swap from the bike pump?

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Originally posted by x_flow57

You need to rev it :-). Can't remember where my peak was but certainly over 5300rpm.

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My dyno sheet is in my photo archive, in the "other" folder.

Red trace is as it arrived on the rollers.
Blue was as good as we could get it.
Orange was when we put the original bike trumpets on. Everyone was surprised at the difference they made, we had to increase the jet size dramatically.

Nearly 6500 before things started to flatten off.

quote:

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Originally posted by Skirrow

quote:

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Originally posted by SJ
Why swap from the bike pump?

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I'd rather not, but the guy at the rolling road said that it was a little small. He said it would be fine for road use but wouldn't supply enough fuel on the track when the throttle is fully open for longer periods of time. I have a track day booked next Saturday so want to try to sort it before then.

Thinking of a fuel pump off a bigger bike, but not sure what to try. I don't know bikes too well but anything bigger than a ZX9R seems to be an "in tank" pump

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quote:

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Originally posted by x_flow57
My dyno sheet is in my photo archive, in the "other" folder.

Red trace is as it arrived on the rollers.
Blue was as good as we could get it.
Orange was when we put the original bike trumpets on. Everyone was surprised at the difference they made, we had to increase the jet size dramatically.

Nearly 6500 before things started to flatten off.

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Originally posted by 19sac65

quote:

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Originally posted by Skirrow

quote:

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Originally posted by SJ
Why swap from the bike pump?

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I'd rather not, but the guy at the rolling road said that it was a little small. He said it would be fine for road use but wouldn't supply enough fuel on the track when the throttle is fully open for longer periods of time. I have a track day booked next Saturday so want to try to sort it before then.

Thinking of a fuel pump off a bigger bike, but not sure what to try. I don't know bikes too well but anything bigger than a ZX9R seems to be an "in tank" pump

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Just a thought - What diameter fuel line are you using - it should be 10mm
Bike pumps are low pressure , high flow , as you probably know ,so should feed a zetec fine if it can feed a bike engine at the revs they make
Never had an issue with mine

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I have 1/4" (8 mm?) feed, plenty of supply.

Are you using a std exhaust manifold? A proper 4 branch & 2" system can make a big difference.

[Edited on 5/11/16 by x_flow57]

Friend of mine was running a standard 2.0 blacktop, zx9 carbs with a bike fuel pump.
From memory jets were 170's

Made 170hp on the dyno. Surprising what a difference a good map on the megajolt makes. Getting the map sorted made all the difference.

[Edited on 5/11/16 by Davedew]

quote:

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quote:
Originally posted by SJ
Why swap from the bike pump?


I'd rather not, but the guy at the rolling road said that it was a little small. He said it would be fine for road use but wouldn't supply enough fuel on the track when the throttle is fully open for longer periods of time. I have a track day booked next Saturday so want to try to sort it before then.

Thinking of a fuel pump off a bigger bike, but not sure what to try. I don't know bikes too well but anything bigger than a ZX9R seems to be an "in tank" pump

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Cheers fellas. I was assuming the rolling road operator noticed fuel starvation problems while on the dyno (rather then looking at the pump and deciding it didn't look big enough)

Manifold is one of these - http://www.kitspares.co.uk/index.php?route=product/product&path=24&product_id=629

No idea which jets he used but he remapped the megajolt and apart from the power it seems like he has done a great job. It drives really well and my wideband on the dash seems to read the sort of figures you would want. Only drove it home in the rain and was in traffic for most of the way so didn't get chance to study the wideband too much though.

I guess I could do with a decent drive in the dry and see how it is.

Dunno if maybe the fuel starvation is what caused the lower than expected power figure. I'm going to ask the rolling road.

Despite my best efforts to not worry about the hp figure, I've been sucked into it! Especially as my mate with a pinto managed 150bhp on the same dyno a few months ago