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Old 04-05-2004, 02:21   #1 (permalink)
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Help EFXR6 fitted extractors & lost power

Hey Guys

I've got an EFXR6 wagon. I recently put extractors & a 2 1/2 system on it about 6 weeks ago. It also now uses more fuel. I have checked the fuel injection, reset the computer, replaced the O2 sensor and checked for exhaust leaks. I was told that the primaries might be too big in diameter. They are Advanced headers very similar to Genie.
Has anyone got any idea how to help?
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Old 04-05-2004, 03:26   #2 (permalink)
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Re: Help EFXR6 fitted extractors & lost power

what size are your primarys, advanced are meant to be quite good, Fuel economy hasnt increased because of you revving it to hear the exh has it???

PS" where did u get it done
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Old 04-05-2004, 04:23   #3 (permalink)
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Re: Help EFXR6 fitted extractors & lost power

How do I find out size of primaries? Do you go by internal or external measure? I have tried to drive like a granny to see what figures I could get and can't match previous economy. Done by Aussie Discount Mufflers, they have cheap prices. People keep telling me Pacemaker are good, do you know what size the primaries are on them?
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Old 04-05-2004, 05:55   #4 (permalink)
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Re: Help EFXR6 fitted extractors & lost power

Hi Bennyboy

As far as I know Advanced headers only do the one set of extractors to suit our motors - Pacemakers do two different styles, (one is a good "street set" while the other has been designed for the EA/EB racers (so they basically work further up the rev range)

Not to be a smartarse but if I use mine as an example, (same model, mine's a manual and I know that no two cars are the same) I consistently get 500-550 km around town and coming back from the FPV weekend I filled up at Broadmeadows and only did a safety stop at Tailem Bend (just over 800 km on the odometer - trip computer said I could have made Adelaide)
Now, I have not yet fitted Extractors (and yes I am looking at the same brand as you've got) but I have fitted a 2.5" stainless system. My cat is still the original so I will be getting this done when I get the extractors.

It looks like you've taken some advice - checked your Injection, O2 sensor etc and you can't see any problems. By how much is it now using the extra fuel? If the usage has increased around town, has it also increased on the open road?? By doing what you've done I would expect your fuel consumption to be better not worse.

If you like, try to make it to one of our meetings - 7:30pm First Tuesday of the month at the Hackney Hotel - there's a few of us with EF's with pretty much the same setup as yours - someone might have some ideas.

Hope to see you there

Paul B
XR6WGN
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Old 04-05-2004, 10:42   #5 (permalink)
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Re: Help EFXR6 fitted extractors & lost power

Bigger primaries should result in better power up the range. I doubt they're so big you've lost power though....
Perhaps they screwed up somehow? The old gasket fell into the cat and blocked it?
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Old 04-08-2004, 03:18   #6 (permalink)
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Re: Help EFXR6 fitted extractors & lost power

Just curious, your header say's "Help EFXR6 fitted extractors & lost power"
Did you infact loose power or are you just using more fuel?
I have an EF XR6 sedan with extractors and 2.5 exhaust that eats stock 5.0ltr holdens for breakfast. But I do believe mine has had a chiptorque chip in it.
I get around 600 km's to a tank around town and most of that is usually sideways :))
I'll have a look tommoro to see what brand they(i think they are geeenies), will be under the bonnet anyhow to replace the leaking head gasket :(
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Old 04-12-2004, 03:19   #7 (permalink)
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Re: Help EFXR6 fitted extractors & lost power

Sorry guys for the late reply but I went away for Easter. EAO WORM it has done both, more fuel and less power. xr6wgn- city and highway fuel usage have increased by about 10% when it should have decreased by 10% and power up by 20% if you listen to everyones claims about extractors.
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Old 04-12-2004, 04:40   #8 (permalink)
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Re: Help EFXR6 fitted extractors & lost power

I had a heap of trouble with my exhaust. What did they do to your cat?? How does it rev? does it cleanly make it to 5500 revs or does it snuffle etc? If there was a block in the exhaust, it would stutter and carry on at about 3500 revs and not rev any further (depending on how blocked it is) This happened to me when my cat crumbled inside and choked up the flow. The I6 motor usually responds great to exhaust mods. There is definately something wrong. Does it make a whistling noise when you give it to it? Mabye it has something to do with where the oxygen sensor is positioned in the new extractors. Maybe it is not reading too much oxygen (all the oxygen might go to a certain 'chamber' in the extractors), therefore making the mixture rich and explaining the decreased fuel economy and reduced power. My advice is, put it on a dyno and go from there (It will rule out a lot). Get a mixture and horsepower reading and compare it to stock. While its there advance the timing a bit. It should be making at least 10Kw more at the rear wheels than stock. If the mixture is the cause, then look further into the oxygen sensor.
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Old 04-12-2004, 08:48   #9 (permalink)
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Re: Help EFXR6 fitted extractors & lost power

I doubt they'd put the sensor in a position where it wouldn't pick up properly?
Benny - try removing the cat and tie the exhaust up so it can't fall on the road, then take it for a burn. If that helps, the cat's stuffed or something similar.
Just remember the heat from the extractors will melt string, so use wire :)
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Old 04-13-2004, 01:51   #10 (permalink)
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Re: Help EFXR6 fitted extractors & lost power

It revs cleanly, so maybe a more accurate description would be a loss of torque. B4 stationary in drive(auto) then floor it it would light up both wheels, now floor it and just pulls away smooth.

Mongrel I will have a look to see if I can do that with the exhaust. Grant there is no whistling, I don't want to pay someone per hour to problem solve my car if possible, who knows where to stop when your doing that.

Xr6wgn I will try to get to the next meeting to have a chat.
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