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Old 3rd August 2011, 02:08 AM   #221 (permalink)
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Quote:
Originally Posted by 2 Black Lines View Post
Adam from memory the std wing is ~6kg and paws thinish fiberglass ones weighed 4kg.

The only place where -R33 remember- theres excess is in inner wing return (flat bit behind head light), uprights to rear cross beam, boot floor - 8kg out and 6.5 in is , inner part of rear wheel arch going forward and up part of sill at front (where ecu is).

For us most weight was lost in cutting and welding arches at rear, to clear tyres, after the wing mirrors....23kg!!

and btw weigh a tank before you spend the money - a std tank is quite light.
Hi mate do you have pics on the work you just mentioned? I dont understand it very well...
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Old 6th August 2011, 06:34 PM   #222 (permalink)
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Quote:
Originally Posted by godzilladom View Post
+1
The standard petrol tank is very light - it weighed the same as an ally one I nearly bought... not sure on CF tho... but they'll be MUCHO DENERO!

The weight of an empty standard fuel tank may not be much, but fill it half full of fuel so that the fuel pumps are not drawing air when cornering and you are in a completely different place.

A fuel cell is a huge weight saver since it has enough fuel to do the job and no more.

Also you can dispense with a swirl pot and a lifter pump, much simpler too.

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Old 2nd November 2011, 06:29 PM   #223 (permalink)
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Would the OEM tank fuel surge (fuel pump suck air) with 1/4 tank of gas on straight 1/4mile racing¿
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Old 2nd November 2011, 07:59 PM   #224 (permalink)
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Would the OEM tank fuel surge (fuel pump suck air) with 1/4 tank of gas on straight 1/4mile racing¿
Depends on how quick the car is I would imagine.
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Old 2nd November 2011, 09:06 PM   #225 (permalink)
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Standard fuel tanks are a bit of a compromise when dragging your car.

Here is a datalog from my R34 with a standard fuel tank.

Top graph shows the RPM changing with time.

Bottom graph shows the fuel pressure corrected for boost

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Old 2nd November 2011, 09:21 PM   #226 (permalink)
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damn fuel pressure drops quite a lot while still revving doesnt it? and you solved this by eliminating fuel surge or was it the fault of another component also?
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Old 2nd November 2011, 09:29 PM   #227 (permalink)
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Nothing wrong with my fuel system other than it was possibly drawing air.

Twin Tomei pumps in-tank.

I run a Motec ECU and have the injectors calibrated for different fuel pressures, so not as problematic as you might think.

Solution for me is to build my car into a track car with a small fuel cell + design a fuel control system to pulse width modulate (PWM) the pumps to provide the fuel pressure I need increasing with RPM.
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Old 15th November 2011, 09:10 PM   #228 (permalink)
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winter work has now started.... gutting more weight out of it after having a bit of a night mare trackday at the weekend. The pump assembly in the OE tank had basically just fallen to bits!

So.... its now gone! Fuel cell to be fitted with twin 044's





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Old 15th November 2011, 09:18 PM   #229 (permalink)
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this is the fuel cell with an extra roll over valve/vent



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Old 15th November 2011, 10:39 PM   #230 (permalink)
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Similar thoughts to mine Adam. I think going fuel cell is the only way for a track car. The weight savings as well as the simplicity of it all make it VERY worthwhile.

Is that a JAZ cell? Could also be a Summit Racing one too.... What capacity did you decide on?? I was reckoning on the 12 gallon one myself....

Like you, im planning on cutting out the floor of the boot to drop the cell in and using twin 044s and a pair of Sytec bullet filters. Have the pumps and filters lying, just need the cell and some fittings . One for Santa I think LOL..

Good work there though..

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Old 16th November 2011, 08:27 AM   #231 (permalink)
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its a JAZ 12gallon

I'm also going to brace the rear with a strut brace....
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Old 16th November 2011, 09:23 AM   #232 (permalink)
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Could the vent be used as a replacement for the vent line that normally goes to the carbon canister?
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Old 16th November 2011, 01:02 PM   #233 (permalink)
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that vent line will be binned, the charcoal canister was binned ages ago
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Old 17th November 2011, 12:27 PM   #234 (permalink)
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Are you going to fit a diffuser at the back ?
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Old 17th November 2011, 04:33 PM   #235 (permalink)
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maybe eventually, will see how it all looks once back together, and i'd really like a flat floor to compliment the diffuser
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Old 17th November 2011, 07:31 PM   #236 (permalink)
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Quote:
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that vent line will be binned, the charcoal canister was binned ages ago
I realize that, What I was wondering is could this be used in place of the factory vent line?
I've pulled all the fuel lines and the carbon canister out of my car, but there is still a small rubber hose out of the top of the tank as a vent, and I'm looking for a solution to put on it.
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Old 17th November 2011, 08:03 PM   #237 (permalink)
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oops
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Old 17th November 2011, 08:03 PM   #238 (permalink)
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I realize that, What I was wondering is could this be used in place of the factory vent line?
I've pulled all the fuel lines and the carbon canister out of my car, but there is still a small rubber hose out of the top of the tank as a vent, and I'm looking for a solution to put on it.
i think fourtoes did this on his blue 32? or someone suggested it to him? a kind of one way valve
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Old 17th November 2011, 09:46 PM   #239 (permalink)
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there is a one way check valve between the OE rubber vent line and the metal line that runs up the car isnt there?

I cant see why the roll over valve wouldnt work (tapped into the tank top)
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Old 14th June 2012, 01:49 PM   #240 (permalink)
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back up...

Right - The car is now hovering around 1350kg..... (2 race seats, and 15l of fuel)

The car has a large multipoint T45 Cage, and 4l fire system.

It has no interior... no air con, no HICAS, no heaters/blowers, no sound-deadning

Things that are light weight

GRP Front Wings
GRP Rear 1/4s
GRP Boot Skin
GRP Doors
Lexan windows
Alu boot floor
12 Gal fuel cell

It has undergone mild metal trimming on the front crashbar...

I really want to get the car under 1300kg - Where the **** can I find 50kg to 'lose' - mostly from the front end!

There is prob 5kg of metal shit still to come out of the cabin (open up the rear 1/4s etc)

Suggestions VERY welcome, but bear in mind its pretty far gone already.
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