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Thread: Extractors

  1. 27th August 2008, 04:59 PM #1
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    Extractors

    Hi,

    Extractors: who has 'em, what do ya think?

    Do they make a difference to the Disco V8?
    I'm talking D1 3.9V8i, but experiences with D2 would also be interesting.

    Is the difference in power and/or economy noticeable?
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  2. 27th August 2008, 05:19 PM #2
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    I had H&M Headers on my '86 RR - but it had been bored and stroked to 4.6 litres and fitted with an Haltech EFI ECU. It also had a large bore exhaust.

    So I don't know what affect it had.

    It was much noisier in the cabin as the steel pipes are noisier than a cast iron manifold.
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  3. 27th August 2008, 08:07 PM #3
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    My D2 has em, although as i have no idea of what type they are since they came with the car when i got it and have not driven another D2 without them as a point of reference i can't really help on if they are a benefit or not.

    I also only have a single cat, and have yet to confirm if there's actually anything in it or if it has been hollowed out at some point in the past too. A tap on it made a distinctly hollow sound so i know which way my suspicions lie....

    Got to love my magical mystery Disco, what's it made of? Nobody knows.....
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  4. 27th August 2008, 08:14 PM #4
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    Not worth the expense
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  5. 27th August 2008, 11:40 PM #5
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    I've got a set of HM headers on the Disco and they're not worth it. Keep the stock system to where the Y joins and change from there back to a freer flowing system. You do notice a benefit from that.
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  6. 28th August 2008, 11:42 AM #6
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    Quite a few people told me not to get extractors as I wouldn't see any noticeable difference without engine mods too. I run a 2.5" system from the y-pipes back and this made a noticeable improvement.
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  7. 29th August 2008, 07:46 AM #7
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    Do you have a manual or an auto?

    My understanding is that extractors are more benifit on manuals, something to do with autos spending most of their live in the lower rev range.
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  8. 29th August 2008, 09:53 AM #8
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    Quote Originally Posted by black betty View Post
    Do you have a manual or an auto?

    My understanding is that extractors are more benifit on manuals, something to do with autos spending most of their live in the lower rev range.
    I have an auto, and it does spend most of it's life in the lower rev range, say below 2500rpm.

    The rear section is 2.5inch I think, with a freer flowing exhaust already.

    It appears from the comments that extractors are not worth the money.
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