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Remap and Intake OR Remap and cat back?

Discussion in 'A3/S3/Sportback (8P Chassis)' started by Faz786, Sep 15, 2011.

  1. Faz786
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    Faz786 New Member

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    [Sep 15, 2011]
    In two minds what would give better bang for buck.

    What are your experiences guys and gals?
    #1
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  3. pinterovski
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    pinterovski Member

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    [Sep 15, 2011]
    What are you driving?
    #2
  4. Boosted
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    Boosted New Member

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    [Sep 15, 2011]
    I have the same question, for an Audi TTS (I believe its the same engine as the S3)
    #3
  5. pinterovski
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    pinterovski Member

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    [Sep 15, 2011]
    Someone said to me that first thing should always be the CAI then a remap.
    The better option is CAI,CAT-BACK and a Remap :beerchug:
    #4
  6. paddy
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    paddy Audi=No fault code, no idea

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    [Sep 15, 2011]
    Other way round...Remap stg 1 and you dont need a CAI TBH on a S3
    #5
  7. Boosted
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    Boosted New Member

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    [Sep 15, 2011]
    So the greater gain is from a catback and remap rather than sticking an intake on and remapping?
    #6
  8. K13 ASJ
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    K13 ASJ Member

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    [Sep 15, 2011]
    If your looking for higher BHP figures remap and CAI is the way to go, If figures dont wory you get the remap and put on the exhaust for a better note
    #7
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  9. Boosted
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    [Sep 15, 2011]
    I'm ok with the exhaust as is, but would defo like to make the most of the extra power that can be achieved via a remap

    However, not quite on budget to get an exhaust system also
    #8
  10. jontymo
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    jontymo New Member

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    [Sep 15, 2011]
    Miltek cat back fitted 3 weeks ago, revo map this weekend, hopefully will feel completely different by 10am this saturday
    #9
  11. pinterovski
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    pinterovski Member

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    [Sep 15, 2011]
    Jontymo,what numbers are you hoping for?
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  12. GNJ_Motorsport
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    GNJ_Motorsport Site Sponsor Site Sponsor

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    [Sep 15, 2011]
    I'd get the CAI and stage 1 then save up and then get turbo back exhaust and upgrade the map to stage 2. But if you want to stop at stage 1, then I'd get cat back and stage 1 probably.
    #11
  13. pinterovski
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    pinterovski Member

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    [Sep 15, 2011]
    How much BHP can you get from a remaped S3 with CAI and a cat back?
    #12
  14. akash_sky1
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    akash_sky1 Active Member

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    [Sep 16, 2011]
    Cat-back doesn't really make much improvement in power or torque, most of the back pressure comes from the downpipe and cat ( and turbo of course). So for performance, remap and CAI first, but the cat/downpipe deffo need upgrading to, to complete the improvement in gas flow efficiency.
    #13
  15. akash_sky1
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    akash_sky1 Active Member

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    [Sep 16, 2011]
    Erm I disagree there. Generic stage 1 maps don't account for a CAI hence you dont need one, but that's not to say a CAI wouldn't give you any benefit even on stage 1. Low end torque may be sacrificed slightly without proper mapping, but improvement in throttle response would be night and day and even a bit of top end power still on stage 1.
    Standard airbox is designed pretty much to dampen the noise of turbo spool & the DV, **** for air flow.
    #14
  16. paddy
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    paddy Audi=No fault code, no idea

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    [Sep 16, 2011]
    Sorry but i would want to see flow figures to prove the "**** for air flow" statement. All the RR figures i have seen for an S3 dont show an appreciable difference with a CAI on stg 1 let alone on a std engine and i did say "other way round" ie: stg1 first then CAI. I would not want to lose "ANY" Torque at the bottom end at the expense of a a slight increase in power at the top given i drive on the road in the real world of traffic and restrictions and not on the track. sorry but small increases in power at 6k rpm are pretty irrelevant for 99% of drivers. peak rev performance is not always the characteristic you want from a good engine...One reason i sold my last 4cyl 12k rpm bike was 4 seconds after dumping the clutch i had broken the national speed limit, 6 seconds and i was in licence ban territory. Where is the fun in that ? i bought a Ducati with the same performance but bucket loads of torque at speeds and revs you could use it, brilliant fun :)
    #15
  17. PaulAr
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    PaulAr S3 (8P)

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    [Sep 16, 2011]
    Decent Stage 1 software only will make 310bhp ish.

    Stage 2 will require CAI and Turbo back exhaust, (and software to match) when budget allows.

    Personally I wouldnt bother with in between measures, stick with proven upgrade paths when funds are available and get the benifits without the hassle. Until the clutch goes that is....

    Good luck
    Paul
    #16
  18. paddy
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    paddy Audi=No fault code, no idea

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    [Sep 16, 2011]
    Havnt found i have need more yet Paul :)
    #17
  19. PaulAr
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    PaulAr S3 (8P)

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    [Sep 16, 2011]
    Agree, I ran Stage 1 for 3 years up until I sold the car and never felt wanting at all.
    Its a perfect tune for the rest of the car, brakes, chassis etc always seemed to hold up well. Although I did tighten things up with H&Rs to give the car a bit more attitude but they werent essential.

    Like most with the tuning bug, I thought about Stage 2/2+ but the thoughts of clutches, possible mis fires, valves spring issues, catch cans, more frequent oil put me off. Not to mention the hassle of resale and putting it back to stock.

    I have driven (drove?) Auldreekies Stage 2+ S3 with Coilovers and ARBs etc and it is a proper weapon so I can see why some want the extra grunt that comes with Stage 2/2+.

    My advise would be to go for Stage 1, making sure you choose software that provides an upgrade path. (just in case!). Most will find that 310bhp is plenty.

    Cheers
    Paul
    #18
  20. akash_sky1
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    akash_sky1 Active Member

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    [Sep 16, 2011]
    Gains in top power are marginal yes till you get proper software to take CAI into account but improvement in throttle response, from the shorter, bigger intake tract is HUGE and very tangible, and IMO makes fitting one before a CAT back very worthwhile.
    Driving with the standard airbox back on feels like throttle pedal has been fitted with a time delay. Also Paddy it was really the improvement in throttle response that I lauded over any marginal top end gains, and this does of course make the car much more enjoyable.
    #19
  21. paddy
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    paddy Audi=No fault code, no idea

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    [Sep 16, 2011]
    I would love to try one some time. I have considered an CAI and seen very suspect pressure tests from the std intake track showing negative ie:vacum on some areas on bends which is a disaster at high flow. the same report said the real gains were in the cold intake rather than in the flow on a std engine so that would apply at stg 1 as well. My feeling is go for it but in relation to post 4 i would do the map first. I have never been one to see a lot of point in flowing air in if you dont flow it out as well and if you are going to do that you might as well go stg2 straight away.. Interesting view on the throttle response akash....Food for thought mate :).
    #20
  22. pinterovski
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    pinterovski Member

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    [Sep 16, 2011]
    My ITG goes on the car today,will tell you how are the results on totally stock car!!!
    #21
  23. Boosted
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    [Sep 16, 2011]
    so....how is it?
    #22
  24. pinterovski
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    pinterovski Member

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    [Sep 16, 2011]
    Well i must say that i'm really really impressed with ITG!!!
    I love that wooooosshhhh sound and noise from stock diverter valve is amazing,
    when i will fit the Forge DV,it's goona be christmas everywhere lol :jester: Lovely sound!!!
    Car feels much more alive and the throttle response is a little bit better,
    the turbo hole remains but in the middle rev range is faster spooling up all to the end!

    Money was not thrown away! Highly recommended:arco:
    Last edited: Sep 16, 2011
    #23
  25. jontymo
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    jontymo New Member

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    [Sep 16, 2011]
    Between 300-310 up from stock 272, hoping it removes some of the lag with this engine/turbo.

    I've not gone for any air upgrade as only really needed for stage 2 and not bothered going there(will change for a TTRS in time for this upgrade)

    Roll on tomorrow morning
    #24
  26. nally
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    nally MPG the new BPH

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    [Sep 16, 2011]
    will revo improve normal driving i.e smoother power delivery or is it just a case of pushing the car to the red ?
    #25
  27. pinterovski
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    pinterovski Member

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    [Sep 16, 2011]
    jontymo keep us update mate :thumbsup:
    #26
  28. jontymo
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    jontymo New Member

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    [Sep 16, 2011]
    Will do matey, will report back tomorrow, also back at Awesome Gti after being mapped to get my miltek realigned and the connecting pipe moved so it cannot be seen from behind.

    Jontymo
    #27
  29. Padtwo
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    Padtwo Member

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    [Sep 17, 2011]
    Interesting thread. I have always thought fit the modifications to the car, then get it mapped to suit, but that would be mapping for that particular car with on road testing and set up on a RR, not a stage 1, 2, 2+ etc. My S3 will be getting mapped soon, insurance is due so I have spoken to them and the warranty is almost out so it wont be long but I am a little wary/intrigued by the one map suits all philosophy but a lot of research has gone into it and thousands have been sold and I will probably be going Revo as there is a dealer fairly close to me.

    To keep things on topic, I think gains from a CAI will depend entirely on how restrictive the original air box is. Most gains will be made from changing the cat to a free'er flowing type but then it sounds like you are heading into stage 2 territory with the added expense of the cat and any ancillaries you may need. As you have only mentioned a cat back then I would probably head towards a CAI, providing that keeps things within the parameters of the stage 1 which is probably what I will be doing. For me, stage 1, then do a bit of research into how restrictive the original airbox is (if at all) then CAI.
    #28
  30. paddy
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    paddy Audi=No fault code, no idea

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    [Sep 17, 2011]
    With revo 1 and an SPS switch you can alter the map to suit bolt on extras later. Personally i dont want the added noise of a CAI or the expense of junking a perfectly good exhaust system for noisy alternative. stg 1 revo does all i need..after all how fast can you really go ? I appreciate that tuning is fun and getting every ounce of performance out of a motor can be a life's mission for some but reality is........its always a trade off. I did 400 miles yesterday, i can drive with the flow, i can pin myself in the seat to overtake and i did a 150 mile stint on Cruise through the night at 85mph down the M11/M25.and got ave of 33mpg for the 400 miles. :) I can break the national speed limit in 6 seconds...and i dont have a load of gear to strip off the car when i chop it in. win win
    Last edited: Sep 17, 2011
    #29
  31. akash_sky1
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    akash_sky1 Active Member

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    [Sep 17, 2011]
    I love the noise of my intake and exhaust, especially when its cold, there not too loud I as still have the OEM votex back box on and the intake is wrapped in heat reflective tape. At higher speeds its still fairly hushed even at high revs, on the inside anway, good balance of noise and refinement.
    The 'raw' mechanical edge they bring is nice, letting you hear the turbo spool and deeper exhaust note, with very mild pop/bangs on overrun, otherwise its just a boring , refined, in-line 4 noise.
    Still have memories of driving a 360 and Murcielago at full chat on a track, different sounds but both amazing, and my cousin's NASCAR-like Pontiac Firebird Trans-Am WS6 with a stainless exhaust, feckin amazing.

    In the future when everything's electric, or some kind of turbine driven hybrid, we won't have any such music, so lets enjoy while we can.
    #30
  32. jontymo
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    jontymo New Member

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    [Sep 17, 2011]
    Well what a wasted morning, got to Vortex, Mike hooked up the laptop only to find no map for my11 TTS only for last years model(think they changed from 268 to 272 bhp)!! so he has downloaded the code from my car and sent to Revo, hopefully Revo will have a map ready for next week!!!

    So off to Awesome to get my miltek non res catback that i bought from them a few weeks ago realigned, the fitter had a good go to no avail, the quad pipes now look correct at the back of the car but the connecting pipe is still wrong with no way of it sitting against the car under body so just sits there like a big lump ready to bottom out, phot's taken and sent to miltek who need to get sorted quickly or its back to the standar pipe refund and hunt down something better!!! also noticed the connecting pipe had worn against the prop shaft and has a small gouge in it!!!!!!!

    Still smiling though even with over a grands worth paid for and its all wrong LOL

    More to come

    Jontymo
    #31
  33. paddy
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    paddy Audi=No fault code, no idea

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    [Sep 17, 2011]
    Yea i go along with you Akash re noise on some lumps. My 3.2 was just superb with the Remus exhaust but the old 4 pot will only ever be a noisy 4 pot to me. I did fit a CAI to my VR6 a few years back and it sounded like an assmatic cow with a bad cough. I would want to hear a S3 with a CAI before i bought one. Which are the quietest ? do you know. I quite fancy a CF twin take and a CF engine cover purely from a looks thing .
    #32
  34. GNJ_Motorsport
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    GNJ_Motorsport Site Sponsor Site Sponsor

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    [Sep 17, 2011]
    I don't find the ITG very loud. The best way I can describe it is just cruising along going through the gears you can hear a slight sucking noise from under the bonnet, then put your foot down and the engine noise is just a bit louder and the intake gives off a nice fluttering noise when you back off on full boost. I wouldn't describe it as loud or intrusive.
    #33
  35. pinterovski
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    pinterovski Member

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    [Sep 17, 2011]
    With ITG everything is just wright :wub:
    #34
  36. Sock
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    Sock Shark in a Goldfishes clothing

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    [Sep 17, 2011]
    Agreed, same with the twin take :)
    #35
  37. Adamantium
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    Adamantium Member

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    [Sep 17, 2011]
    I would always say do the exhaust first.

    First of all, cold air input is far less important when the car is moving. If you install a temp gauge and log under bonnet temps when actually on the road, you'll see that they are pretty much ambient when on the move. The dyno (which should NEVER be used to compare one car versus another (or even the same car as a before and after strictly speaking) very much flatters the effects of fitting a CAI, as the fans are never up to the job of replicating real airflow.

    As far as volumetric efficiency is concerned, smoothing the exhaust path is more valuable then the pre turbo intake path as restrictions when the air is at or around atmospheric pressure have a far less significant effect than after you pressurise the gas and heat it to around 1000 degrees!

    I tend to question the value of any CAI kit. Over the years they have only ever shown themselves to be about under bonnet bling rather than being actually useful.

    If you want to improve flow, concentrate on the pressurised side of the gas stream and then remap.

    btw. on the gtr, a decent cat bacl exhaust fitted after the primary cats in the highly restrictive stock downpipe can still yield an extra 40 bhp, even without remapping!

    I know its a much more powerful car to start with, but the point to bear in mind is that even if you dont remove the smallest restriction (the cats) doesn't mean that there's no benefit from improving the rest of the system.

    Imagine a hosepipe. blow down one with a 1cm diammeter, and then a 3cm diameter that has been pinched somewhere along its length to 1cm. Do you think they'll be just as dfficult to blow down? The answer is no, because the 1cm restriction in the larger pipe only occurs for a very short length, so its contribution to the back pressure is much lower than if it were along the entire pipe.

    Lame analogy i know, but at least you can imagine it!
    #36
  38. paddy
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    paddy Audi=No fault code, no idea

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    [Sep 17, 2011]
    Would you like to explain this ? I would have thought the whole point of a dyno was fault diagnosis and with out before and after you will not know if you succeeded.

    I used a Dyno for years in motorcycle race tuning and i cant off the top of my head think of an alternative for getting the set up right without before and after logs.

    I do however agree about CAI. they move the figures around but as you say the results are usually Dyno logged and that is never realistic to pressure and flow on the road. its quite possible ( unlikely) that due to aero dynamics of the front of the car you could have a vacuum formed at points on the grill that would effect the air intake :)
    Last edited: Sep 17, 2011
    #37
  39. N8
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    N8 Kowalski Details VCDS Map User

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    [Sep 17, 2011]
    I'd do Stage 1 Map, then when your fed up of the power, TBE, intake and pump and revised software and your ballin'
    #38
  40. Adamantium
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    Adamantium Member

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    [Sep 17, 2011]
    Engine dyno is a brilliant tool.

    I trust those fully, but even then I would only trust figures from the same dyno.

    rolling roads are completely inconsistent.

    There are too many variables that can be altered due to the way they are operated.

    Without changing any settings I have watched the same car appear to spool its turbo 500 rpm quicker, just by the operator showing me the different ways he can perform a run.

    Add in to that ambient pressure, tyre pressue, humidity, etc, and although you can compensate for them, there's just too many variables than will make your number meaningless.

    Hub dynos are a better option, and even then, only for measuring power at the wheels but ultimately you can only really trust the engine dyno and the velocity when you cross the line on the quarter mile to give an indication of power.
    #39
  41. Farhan
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    Farhan Active Member

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    [Sep 17, 2011]
    Yea operators can tamper loads with rolling roads. IATs make a big difference to and also it can vary depending on where the operator places the inlet probe.

    Not long ago i saw some poor figures at inters on a rolling road. i loved the way the operator tried to sell the owner software to up the power and prove he could up the power. I however knew that the ecu couldnt be remapped properly without a standalone aftermarket ecu.

    Back to the ops question, i would go generic stage 1...Then if you ache more power get the turbo back and relevant hardware with a stage 2 :)
    #40

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