Join Today
Results 1 to 12 of 12
  1. #1
    Senior Member
    Bored it now need to build
    it...
    Bigsi15's Avatar
    Join Date
    Aug 2015
    Location
    Bristol
    Posts
    329
    Thanks
    72
    Thanked 35 Times in 24 Posts

    Effect of larger exhaust on afr

    Hi guys
    So my exhaust isn't long for this world and it seems the right time to go full stainless turbo back. Was thinking 2.5" due to costs but I was wondering will this larger freer exhaust have much effect on air fuel ratios in regard to running richer or leaner? I can't monitor mine so wouldn't want to run lean without realising. Iv done some googling and it's not given much definitively

    Car is a 96 850 t5

    Thanks guys!
    Last edited by Bigsi15; Wednesday 19th April 2017 at 13:34.

  2. #2
    Trader
    This user has no status

    Join Date
    Aug 2013
    Location
    Chesham, Bucks.
    Posts
    215
    Thanks
    6
    Thanked 154 Times in 84 Posts
    You can find, and order, the Swedish made Ferrita cat back that I stock here on my website: http://kalmar-union.com/parts/volvo-..._c70-exhausts/

    The price includes VAT and UK mainland delivery, there is a supplement for some remote Scottish addresses and NI.

    The standard software will run the engine properly with this exhaust and there would be a very small increase in outputs. If you were to add the stainless d'pipe with 100cel cat you would need to change the software to avoid check lights etc., you would then have substantial increases in both power and torque.

    Don.
    MTE performance software, Ferrita stainless exhausts, TME stainless exhausts, AP heavy duty clutch kits, KU single mass flywheels and LSDs. 01494 785508. email don@kalmar-union.com

    www.kalmar-union.com

  3. #3
    Gearbox Killer
    aiming for the 13's again...
    MoleT-5R's Avatar
    Join Date
    Jun 2011
    Location
    Mid-Wales
    Posts
    4,880
    Thanks
    2,633
    Thanked 2,367 Times in 1,580 Posts
    I'd like to help here, but not sure I can fully as I fitted a full 3" system to my 855 t-r a while back along with a few other mods at the same time, but unfortunately bent a rod on the first run out in her after re-assembly, on reflection and listening to advice of others more knowledgeable than me, afr was more than likely to have played a major part in this !! As I was at the time unable to monitor afr's and pushed it too hard at the time (stupid I know), so I'd be careful if you do change it and get it on the rollers afterwards and get it checked, be a lot cheaper than fitting a new engine. I doubt fitting a 2.5 system will make much difference, but better safe than sorry.
    Last edited by MoleT-5R; Wednesday 19th April 2017 at 14:11. Reason: spelling....

    Current Volvo's 1995 854 Gul T-5R 1996 855 Olive T-5R 1997 855 Olive AWD 1999 V70R AWD and 2005 XC90 D5 AWD
    Previous Volvo's 1987 745 gle 1989 745 GL 1995 855 Olive GLE 2001 V70 p2
    My Ebay Items http://www.ebay.co.uk/sch/moleadrian...p2047675.l2562

  4. #4
    Senior Member
    Bored it now need to build
    it...
    Bigsi15's Avatar
    Join Date
    Aug 2015
    Location
    Bristol
    Posts
    329
    Thanks
    72
    Thanked 35 Times in 24 Posts
    Ah mole that's such bad luck sorry buddy perhaps it was something else contributing to it not just the exhaust? I have forged Rods so hopefully that will protect me a bit just don't want to run lean and burn a hole in something!

  5. #5
    Senior Member
    Keeping it looking stock
    Harvey's Avatar
    Join Date
    Mar 2012
    Location
    Newton abbot, Devon
    Posts
    5,432
    Thanks
    871
    Thanked 1,514 Times in 1,245 Posts
    Just what other jobs were done at the same time ?, I would have thought the ECU would learn quite quickly on a exhaust / cat change.

  6. #6
    Gearbox Killer
    aiming for the 13's again...
    MoleT-5R's Avatar
    Join Date
    Jun 2011
    Location
    Mid-Wales
    Posts
    4,880
    Thanks
    2,633
    Thanked 2,367 Times in 1,580 Posts
    Quote Originally Posted by Harvey View Post
    Just what other jobs were done at the same time ?, I would have thought the ECU would learn quite quickly on a exhaust / cat change.
    Quite a bit was changed at the same time Harvey, an S60R exhaust manifold with the collector ported, polished and knife edged (the other end will be done when the new head gets done), a matching 3" angled flange turbine housing was ported and polished to match and then fitted to the existing 15g, which has also gained an adjustable wastegate actuator. Attached to the turbo is a full cat-less 3" system running right to the rear, so hopefully increasing flow and aiding the previously modified full intake setup. Also an AEM methanol kit was installed but not commissioned at the same time, though should this had been up and running, then possibly the issue may not have happened in the first place. I probably went to harsh on the spring choice to start with in the actuator and also the current set-up runs an MBC which was wound back full off, so in theory just using actuator pressure for setup proposes.

    Second gear killed it and a dosy driver, I always thought the rule was do boot it in 3rd, 4th, 5th under 3500 rpm looks like that's a myth I learnt the hard way. The 4.3 ecu couldn't or wouldn't have reacted or learn fast enough as far as I can see and having only been on the road less than 10 minute not really had time to understand the new setup, which it had no control over its own boost conditions. Also as we did fine out when the 4.3's map was disassembled it is not very nice to the car anyway, even though it runs and drives nicely and has helped me to 14.3 on the strip, it turns out that the unknown map just is standard t-5r map with the limits wound though the roof.

    Lessons learnt from this are many and a more controlled approach to the next session of testing. I am currently getting everything sorted for the new engine, with a faster 4.4 ecu with new base map that will have hopefully taken into account the various modifications and allow logging of what is happening fuel and knock wise should it occur when and where. As soon as funds allow then I be fitting an AEM failsafe AFR gauge and utilise the low side failsafe output to trigger my newly dreamt up failsafe idea that hopefully will dump boost should conditions good bad fueling wise and in turn instantly improve fuel/air mixture and make me instantly aware of the issue.

    Current Volvo's 1995 854 Gul T-5R 1996 855 Olive T-5R 1997 855 Olive AWD 1999 V70R AWD and 2005 XC90 D5 AWD
    Previous Volvo's 1987 745 gle 1989 745 GL 1995 855 Olive GLE 2001 V70 p2
    My Ebay Items http://www.ebay.co.uk/sch/moleadrian...p2047675.l2562

  7. The Following User Says Thank You to MoleT-5R For This Useful Post:

    Harvey (Friday 21st April 2017)

  8. #7
    Senior Member
    Yes I will be behind you but
    thats for the benefit of your
    health.
    martin_r_smith's Avatar
    Join Date
    May 2013
    Location
    wiltshire
    Posts
    965
    Thanks
    573
    Thanked 366 Times in 270 Posts
    and all that by the next shakey meet?? lol
    854 T5 - The new project.

    850 tdi - sorely missed.

  9. #8
    Gearbox Killer
    aiming for the 13's again...
    MoleT-5R's Avatar
    Join Date
    Jun 2011
    Location
    Mid-Wales
    Posts
    4,880
    Thanks
    2,633
    Thanked 2,367 Times in 1,580 Posts
    Quote Originally Posted by martin_r_smith View Post
    and all that by the next shakey meet?? lol
    mid may if I'm lucky....

    Current Volvo's 1995 854 Gul T-5R 1996 855 Olive T-5R 1997 855 Olive AWD 1999 V70R AWD and 2005 XC90 D5 AWD
    Previous Volvo's 1987 745 gle 1989 745 GL 1995 855 Olive GLE 2001 V70 p2
    My Ebay Items http://www.ebay.co.uk/sch/moleadrian...p2047675.l2562

  10. The Following User Says Thank You to MoleT-5R For This Useful Post:

    Harvey (Friday 21st April 2017)

  11. #9
    Senior Member
    Yes I will be behind you but
    thats for the benefit of your
    health.
    martin_r_smith's Avatar
    Join Date
    May 2013
    Location
    wiltshire
    Posts
    965
    Thanks
    573
    Thanked 366 Times in 270 Posts
    I'm not sure if i can make that one but the one after i will. Hopefully my car will have been to Tim by then too..
    854 T5 - The new project.

    850 tdi - sorely missed.

  12. #10
    Gearbox Killer
    aiming for the 13's again...
    MoleT-5R's Avatar
    Join Date
    Jun 2011
    Location
    Mid-Wales
    Posts
    4,880
    Thanks
    2,633
    Thanked 2,367 Times in 1,580 Posts
    Yep hope to make a run or 2 on 13th or 14th of may and then do 10/11th of June for the weekend

    Current Volvo's 1995 854 Gul T-5R 1996 855 Olive T-5R 1997 855 Olive AWD 1999 V70R AWD and 2005 XC90 D5 AWD
    Previous Volvo's 1987 745 gle 1989 745 GL 1995 855 Olive GLE 2001 V70 p2
    My Ebay Items http://www.ebay.co.uk/sch/moleadrian...p2047675.l2562

  13. #11
    Senior Member
    Keeping it looking stock
    Harvey's Avatar
    Join Date
    Mar 2012
    Location
    Newton abbot, Devon
    Posts
    5,432
    Thanks
    871
    Thanked 1,514 Times in 1,245 Posts
    Reading that long list of jobs , Its fair to say something else other than a new down pipe caused the pain you have now..

  14. #12
    Gearbox Killer
    aiming for the 13's again...
    MoleT-5R's Avatar
    Join Date
    Jun 2011
    Location
    Mid-Wales
    Posts
    4,880
    Thanks
    2,633
    Thanked 2,367 Times in 1,580 Posts
    Nope... just a home tuner getting to big for his boots. ..Nothing else..just my own stupidity. ...and I except that but it took 9 years of playing to bend a rod so I ain't that nieve. ..just getting more careful with knowledge. .

    Current Volvo's 1995 854 Gul T-5R 1996 855 Olive T-5R 1997 855 Olive AWD 1999 V70R AWD and 2005 XC90 D5 AWD
    Previous Volvo's 1987 745 gle 1989 745 GL 1995 855 Olive GLE 2001 V70 p2
    My Ebay Items http://www.ebay.co.uk/sch/moleadrian...p2047675.l2562

  15. The Following User Says Thank You to MoleT-5R For This Useful Post:

    Jamest5r (Saturday 22nd April 2017)


 

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
ipv6 ready