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THS Test pipe and 4 bar fpr

Discussion in 'A4/S4 forum(B5 Chassis)' started by Oranoco, Mar 14, 2011.

  1. Oranoco
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    Oranoco Well-Known Member

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    Been offered a 4 bar fpr for gratis from a mate. Is it worth grabing and throwing on the car?

    Also been looking at the THS de-cat pipe. Anybody have any experience with them,are they worth fitting? (off road use only as we need to protect mother earth and hug trees and stuff). Heard a few people say a sports cat or de-cat frees these engine up quite a bit.

    Ooo, engine is an AEB 1.8T with Superchip, Miltek cat back system, Forge 007 Recirc, K&N cone and modified N75 valve

    Cheers god folks :)
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  2. Sandip
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    Sandip Well-Known Member

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    Doesn't the AEB have a 4bar as standard??
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  3. Jason.s
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    Jason.s Active Member

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    Yep it does.

    Also i have a THS decat. Not fitted yet though as im waiting until i do my clutch/flywheel change. I would say i can give you an idea when its fitted but i have no idea when its getting done yet :(

    Hoping when i eventually get it done i can get some logs before and after to give a rough indication of what its done.
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  4. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator

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    The decat will help slightly improving response and spool, but tbh the turbo on these motors is so small that its already more or less flat out running a basic remap, so dont expect it to unleash 20hp as it might on a scooby or something.

    4Bar is already there.
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  5. Oranoco
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    Oranoco Well-Known Member

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    I didn't know the AEB had a 4 bar from the factory, I keep seeing it mentioned as an upgrade part. Will look at the de-cat and a front mount then maybe a turbo change.
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  6. nwmlarge
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    nwmlarge flat out

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    i don't wish to piss on your chips but if you are gonna mess about with all that why not buy an s4?
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  7. Jason.s
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    Jason.s Active Member

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    Because thats a lot of money compared to those bits and it`d still be more reliable than an S4 lol. You could say that to everyone thats modded a 1.8T. And then to people that mod an S4 you could tell them to buy an RS4?
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  8. mal79
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    mal79 Member

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    That is the conundrum I face when going forced induction next year:

    TQS - Cheaper, lighter, easier to work on, less scary for wife to drive, or;
    S4 - Pricier, heavier, engine pull for many jobs but greater tuning potential.

    Funds will ultimately decide for me, but given unlimited funds, adding lightness to an S4 would be my choice...
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  9. Jason.s
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    Jason.s Active Member

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    Given unlimited funds an RS4 would surely be the better ticket over the S4? :p
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  10. nwmlarge
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    nwmlarge flat out

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    from a practicality point of view i'd have thought a standard s4 which puts out more power than a tuned 1.8t would make sense ?
    an rs4 is considerably more outlay for servicing and general running, an s4 is like a happy medium.
    i wasn't looking to make a silly point for the sake of it it was just an honest question/suggestion, apologies if the tone didn't come across.
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  11. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator

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    Thing is if your going to the effort of changing the turbo on a 1.8T then you can easily fit one big enough for 350hp for not much more money than it'd cost to fit one thats good for 260.

    Personally, i wouldnt buy an S4. The running costs are significantly higher, mods cost a lot more as everything seems to have an "S" tax, they're heavier, harder to work on etc etc.

    Unless your wanting big power (say over 350hp) a 1.8T Quattro is a better buy.
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  12. nwmlarge
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    nwmlarge flat out

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    is the consumption comparable on the 300ish bhp 1.8t to the s4 ? out of interest.
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  13. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator

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    The 1.8T will be better, as its lighter, and has less internal friction (less pistons). Pretty marginal though.

    Biggest difference is the weight. Our TQS Avant is 1500kgs and returns 30-31 mpg on a motorway run, craigs S4 saloon is 1600kgs and returns 28-29 on the same run.
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  14. mal79
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    mal79 Member

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    I prefer saloons myself. No doubt my unlimited funds S4 build would end up much the same as the famous RS4 Sedan Project...

    Is a TQS really that heavy? I thought that Quattro weighed in about 80kg and along with the base car (1.8T) at 1275kg, a TQS would be around 1355kg? All figures from Parkers mind... My point being that if an S4 is only 100kg heavier, then a programme of adding lightness could bring it much closer to TQS kerb weight. Seriously this has a massive influence on whether I go for a TQS or S4!
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  15. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator

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    But then the same program on a 1.8T would see you lighter still...

    A FWD 1.8T Avant A4 is ~1350kgs, saloon is 1300 or so.
    TQS avant is ~1500kg and TQS Saloon is ~1450kg

    I dont really think theres 100kg of stuff to remove without getting into pulling out bits of the interior.

    For instance, I've removed the AC compressor, condenser and pipework from my TQS saloon, weighted all the bits and it only came to 15kgs.
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  16. Oranoco
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    Oranoco Well-Known Member

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    I like the S4 but the engine is heavy and hanging out over the front which is not great for the handling. I can't help but feel the S4 makes too many compromises to make it viable. In saying that a B5 S4 is still on my shortlist of possible replacements along with the S3 and E39 BMW M5 but I have to admit despite loving my Audi's the BMW is looking like the best option at the moment :(
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  17. nwmlarge
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    nwmlarge flat out

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    i'm a bmw fan!
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  18. mal79
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    mal79 Member

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    Am I correct in thinking that in the RS4 installation, the engine was mounted slightly further back towards the bulkhead? I remember reading somewhere that the RS4 propshaft was shorter, possibly for this reason...

    Perhaps I should go for TQS, then give it to wife and buy an S4 for me when funds allow!!!
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  19. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator

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    No, the B5 S4 and RS4 drivetrain is identical.

    later cars, B8> have a different gearbox which allows the engine to sit further back, by moving the diff ahead of the clutch.
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