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STD fuel reg vs XR fuel reg.... 

 

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 Post subject: STD fuel reg vs XR fuel reg....
Posted: Mon May 21, 2007 3:28 pm 
Oompa Loompa
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Im looking for advise on which is better.
I have an EL running XR head, cam, ECU etc and have been advised to stick with the STD fuel reg as the XR version 'over-fuels'

Has anybody got any firm results with this?

Car goes very well with STD in place but i have an XR one sitting there.

Thanks in advance.

 

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 Post subject: fuel reg
Posted: Mon May 21, 2007 3:46 pm 
Getting Side Ways
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Yes i can definatley say that the XR fuel reg over fuels in my experance, even with mods in sig. Can easily make it use 18ltr/100km.
At the moment it is about 15.5/ltr per 100km thou.
At night i can clearly see unburnt fuel in the lights of cars behind me.

with a chip, maybe it would be worth while

 

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Posted: Mon May 21, 2007 3:48 pm 
Getting Side Ways
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Not sure. But remember the Tickford ECU's are tuned to suit the XR/Tickford fuel pressure regulator. Also you've got the oxy sensor which should adjust if it's over fueling.

 

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Posted: Mon May 21, 2007 4:41 pm 
Getting Side Ways
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1: Leaner engines produce more power
2: Too lean = too hot + detonation etc
3: Falcons run RICH!!!
4: Lower fuel pressure will produce more power

XR reg = higher fuel pressure = lower power.

EEC will learn its way around most changes you make to fuel pressure tho.

 

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Posted: Mon May 21, 2007 4:51 pm 
Oompa Loompa
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4.9 EF Futura wrote:
2: Too lean = too hot + detonation etc

Could this be the reason why at WOT around 5K rpm it pings its a*** off and blows a nice big cloud of unknown smoke out the back? :?

If its leaning right out at high RPM, would i be safer using the XR reg?

 

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Posted: Mon May 21, 2007 5:12 pm 
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partsguy wrote:
4.9 EF Futura wrote:
2: Too lean = too hot + detonation etc

Could this be the reason why at WOT around 5K rpm it pings its a*** off and blows a nice big cloud of unknown smoke out the back? :?

If its leaning right out at high RPM, would i be safer using the XR reg?


Christ it sounds like its pinging a beauty. (That black smoke is oil getting past the pistons as they rattle in the bore). Has that nice browny-black colour? Lovelly.

Im suprised to hear its THAT bad with an XR cam, ecu etc.

It'll prob be one of the following

- too lean (xr reg may help... but sounds like its way off... )
- too much advance (its an EL, yeah?? Check base timing on dizzy)
- carbon built up in engine
- poor quality fuel (you run 98RON? if not... do!)
- poor tune... i.e. combo of fueling/timing (but its std xr ECU, yeah?)

 

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Posted: Mon May 21, 2007 5:29 pm 
Oompa Loompa
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yeh well its in a workshop for a few probs atm.
Inlet manifold gasket leak for starters (could explain a bit)
The head is fresh so carbon should be out of the question.
Running Bp ultimate all day everyday
New dizzy installed, not trusting the guy who set my timing at all, so that will be re-checked without the air leaks.
It will be interesting to see if any of this has an effect on it.

 

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Posted: Mon May 21, 2007 5:32 pm 
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Yep, get those airleaks sorted first and foremost... or else you're just running around in circles.

Should be able to check base timing ok tho... im not 100% on the 6 cyl specs... but fairly simple process (involves putting the ecu into diagnostic mode).

 

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