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Old 19-02-12, 09:09   #1
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Gas research metering rods

Guys where can I buy various sized metering rods from or atleast make mine smaller to allow more log through from cruise to wot as mine reads 15 and beyond from 1/2 throttle onwards, is there a way of making the diameter smaller with out wrecking the rod?
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Old 19-02-12, 09:32   #2
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Guys where can I buy various sized metering rods from or atleast make mine smaller to allow more log through from cruise to wot as mine reads 15 and beyond from 1/2 throttle onwards, is there a way of making the diameter smaller with out wrecking the rod?
hey man you can start with a base rod and turn it down in a lathe
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Old 19-02-12, 12:18   #3
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Ok cool so ya can't buy different size ones off the shelf that are made to suit eg 10psi, 15psi ect
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Old 19-02-12, 15:21   #4
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Ok cool so ya can't buy different size ones off the shelf that are made to suit eg 10psi, 15psi ect
nah you can get different base rods then machine them to suit
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Old 19-02-12, 15:33   #5
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Ah k sweet coz at 5psi it's dropping to 16.5 and that's not wot so I don't want to open it up incase
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Old 19-02-12, 15:36   #6
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Ah k sweet coz at 5psi it's dropping to 16.5 and that's not wot so I don't want to open it up incase
16.5? is that air fuel ratio?
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Old 19-02-12, 16:55   #7
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Yeah soz man yeah afr on the wideband
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Old 19-02-12, 16:56   #8
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On idol is at 11.5
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Old 20-02-12, 16:15   #9
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On idol is at 11.5
cool, what is it on x-factor? lol jokes

can you get a reading in Lambda? Should be around 1.0 lambda at idle and cruise and around .85 at wot/full boost.
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Old 20-02-12, 17:28   #10
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I'm reading it straight from an auto meter wideband gauge
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Old 21-02-12, 11:17   #11
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I'm reading it straight from an auto meter wideband gauge
yeah, but is that setup for petrol or lpg?
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Old 21-02-12, 11:30   #12
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man how do u set up a gauge? ive screwed the wideband o2 sensor into the exhaust and conected it to the gauge as per all the wiring diagrams, there isnt a setting for lpg or petrol......the metering rod is the stock one that comes from gas resaearch in the 440 t/b, like i said on idol it reads 11.5 and idols nice and smoth its just under load it leans right out....i just need to get difrent rods or start maching mine down till its around the 11 mark through the rev range
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Old 21-02-12, 12:25   #13
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man how do u set up a gauge? ive screwed the wideband o2 sensor into the exhaust and conected it to the gauge as per all the wiring diagrams, there isnt a setting for lpg or petrol......the metering rod is the stock one that comes from gas resaearch in the 440 t/b, like i said on idol it reads 11.5 and idols nice and smoth its just under load it leans right out....i just need to get difrent rods or start maching mine down till its around the 11 mark through the rev range
i remember getting my car tuned to 0.83 lambda under load if it helps dude
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Old 21-02-12, 13:29   #14
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thanks bud but how do i get the lambda reading....just getting standard afr at the moment..
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Old 21-02-12, 13:43   #15
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Lambda
Lambda (λ) is the ratio of actual AFR to stoichiometry for a given mixture. Lambda of 1.0 is at stoichiometry, rich mixtures are less than 1.0, and lean mixtures are greater than 1.0.
There is a direct relationship between lambda and AFR. To calculate AFR from a given lambda, multiply the measured lambda by the stoichiometric AFR for that fuel. Alternatively, to recover lambda from an AFR, divide AFR by the stoichiometric AFR for that fuel

as sited from http://en.wikipedia.org/wiki/Air%E2%...l_ratio#Lambda
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Old 21-02-12, 13:50   #16
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ok well going by the gas research site 16.3 is 1.05 lambda which is what im seeing on 1/2-3/4 throttle but on idol im seeing 11.5 which is .75 lambda....i think i need to richen up the idol setting to 15.5 which is 1.00 lambda.......only way i can fix the wot is by maching the metering rod down gradually till i see around .80 lambda on wot
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Old 21-02-12, 14:12   #17
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ok well going by the gas research site 16.3 is 1.05 lambda which is what im seeing on 1/2-3/4 throttle but on idol im seeing 11.5 which is .75 lambda....i think i need to richen up the idol setting to 15.5 which is 1.00 lambda.......only way i can fix the wot is by maching the metering rod down gradually till i see around .80 lambda on wot
11.5 is really rich

stoich (well close to stoich) is 16.3 parts air to 1 part fuel

if your running 11.5

then its 11.5 parts air to 1 part fuel,

meaning there is more fuel

you you would need to restrict the flow of gas to bring that figure up
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Old 21-02-12, 15:06   #18
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yeah man ill just screw the mixture screw in or out to bring it back out to around 15.5
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Old 21-02-12, 15:58   #19
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yeah man ill just screw the mixture screw in or out to bring it back out to around 15.5
that or get a bigger metering rod

****s hard to tune man, there are only a few people in the country who are good at it, liquid injection is a different story
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Old 21-02-12, 15:59   #20
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idol not a problem its under boost the problem lies i just sent ya a pm
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Old 22-02-12, 11:21   #21
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yeah, that's way too lean under load even worse under boost. You have a boost reference line to the converter setup yes?
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Old 22-02-12, 17:28   #22
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Yeah mate I've got lines hooked up from the cooler piping just after the cooler to the top of the converters
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Old 22-02-12, 17:43   #23
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idol not a problem its under boost the problem lies i just sent ya a pm
Oh and the drama begins! The joys of straight LPG man! enjoy lol
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Old 22-02-12, 17:59   #24
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try the balance line from just after the turbo discharge, it usually richens things up under boost.

forget lambda, AFR is universal, the numbers don't change for AFR and fuel type, lambda does.

Suggest feed it whatever it wants at idle to get the smoothest idle, usually mid 12's, WOT no boost 14.5, with boost under 14 and low 13's at WOT with boost, cruise 15.5 to 16. Roughly speaking.

WOT with boost I aim for 13.3 to 13.6, but every engine is different, how well the fuel distributes is important too, uneven distribution may mean that the engine may need a compromise AFR to get the most power, as some or one or two cyls might be lean, etc. Gotta read the plugs too really.

With gas the pre turbine backpressure plays a big part in how you tune it, if it has a small rear housing, you may need to be more careful of being too rich, not that you are having that problem! Good flowing turbine I've found 13.6 is good power mixture, but it varies. Some dynos and widebands vary heaps too, even the very expensive units, numbers are only a guide, its what works that matters most.

With the rods just do anything you can to make it smaller where it needs it, lathe, file, sandpaper, a simple backyard method is put rod in a drill and use a bit of sandpaper or a file, etc.

EDIT, being that you only have 2.5psi base vapour press, that could be making the run leaner than it should, how small is the rod you have now?
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Old 22-02-12, 18:12   #25
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Cheers Paul u could help me out and chop a brother out with some advice and not keep it all hush hush lol..... Thanks man
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