1994 E34 325tds, turbo and boost levels

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  1. 1994 E34 325tds, turbo and boost levels 
    #1
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    hi, ive done a search but cant seem to find what im after.

    im looking for a bit more power from the tds lump and have already increased the boost to 17psi but i have no benchmark as to what the stock boost is?? i would hazard a guess at 12-14psi?

    also, what sort of boost can /has been run on theese? diesels are generally pretty tough bottom end wise but i have read about the m51 having head cracking issues with boost increases. whats the highest boost that anyone knows has been run??

    also has anyone ever upgraded the turbo? the stocker pulls strongly from around 1500rpm but feels a bit restrictive at high rpms. id sacrifice a bit of lag for a slightly bigger turbo and more outright power from say 3 to 5krpm.
    any info much appreciated
    kev

    325tds until i finish the skyline...........but i do quite like the tds!!!
     
     

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    we've just got hold of a 325tds as more of a daily runner, no plans to tune it as of yet but may have a play with remap.

    As for your question, I'm not sure if anyone other than A20RYM can shed any light. However, I do know that if you email these guys;

    http://www.tdi-plc.com/

    They will be able to advise you. They are the pinnacle in general of performance tuning and did my previous Supra TT and they also specialise in tuning German cars.
    Let the fun times roll .....

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    DSK
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    Fwiw, I personally would not go whacking the boost up on its own, you are likely to over do it and cause yourself more grief than its worth.

    Have you considered something like this ECU remap (30bhp & 55lbs of torque)?
    http://www.morego.co.uk/product_deta...ake=5&model=57
    Let the fun times roll .....

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    Quote Originally Posted by DSK View Post
    Fwiw, I personally would not go whacking the boost up on its own, you are likely to over do it and cause yourself more grief than its worth.

    Have you considered something like this ECU remap (30bhp & 55lbs of torque)?
    http://www.morego.co.uk/product_deta...ake=5&model=57
    thanks mate, im surprised that not many seem to have gone down this route with a tds before.
    yeah, remap is on the cards, just fancy a bit of a play first really. gonna look into intercooler upgrades next, the stocker is pretty small just need to find something suitable. might have a trip to the scrappy...

    325tds until i finish the skyline...........but i do quite like the tds!!!
     
     

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    I'm not knowledgeable on tuning BMWs (turbo variants), but if you look at your skyline and Supra's etc etc, they are genuinely capable of running increased boost levels within reason. However, owners alway do it as a performance package by upgrading the intercooler, colder spark plugs, decats, boost controllers etc.

    Even on the Jap tuning scene people will not fit a boost controller alone and whack it up.

    I'll give A20RYM a heads up on this thread, he also has a 325tds and knows his blocks from his bearings and may be able to help. However on this I'd speak to TDI plc and see what they say, then source the parts and have them fitted elsewhere.
    Let the fun times roll .....

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    mooser (19-07-2009)

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    [QUOTE=DSK;149658] but if you look at your skyline and Supra's etc etc, they are genuinely capable of running increased boost levels within reason. However, owners alway do it as a performance package by upgrading the intercooler, colder spark plugs, decats, boost controllers etc.QUOTE]

    yes mate im well aware of that. thats why the skylines off the road at the mo. turbos, injectors, ecu, boost controller, mafs, hard pipe kit, a clutch to re-plate and a gearbox to replace. then a remap.
    generally with most cars theres basic guidelines as to what you can asfely get away with with bolt ons,boost increases etc and i thought that the m51 being as well made as it is reputed to be would have been no exeption. however ive never bothered to tune a diesel before and this is really just something to do for fun.

    im genuinely surprised at the apparent lack of tuning info on these as they seem to be a good compromise between fuel consumption and performance and turbo diesels generally get good performance gains over n/a petrols for the outlay.
    i suppose ill try 20psi and see what happens!!

    325tds until i finish the skyline...........but i do quite like the tds!!!
     
     

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    Sorry for late visit on this thread, thanks for you PM DSK

    I too have had thoughts of tuning the M51 325tds engine but there is very limited information (and severe lack of funds).

    I did come across a link that Ronnie once posted that MAY be of use to you

    I was wandering around the site that Ronnie had posted up and although it doesn't cover the M51 that we have it gives insight of the areas that could be looked into further.

    http://tuning-diesels.com/75Zt/R75tu3.htm

    I'm afraid I am rather GREEN when it comes to Turbo's and modifications as I have never owned a proper turbo vehicle before.

    Also, check out posts from
    r32to330d and doug1234
     
     

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    mooser (19-07-2009)

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    well i put in a boost guage and a bleed valve this afternoon and boost is now at 19psi. i also redid my 5pence egr bypass with a 1pence egr bypass and from a 25 mile drive i managed 49.6 mpg....that seems to be up by about 9mpg on that drive. will have to do a few more miles to check thats right and not just a one off....

    cars definitely a touch more responsive now, especially at below 2500rpm and on part throttle. ill try to get some pics of the work up, as metioned by STK if anyones interested

    325tds until i finish the skyline...........but i do quite like the tds!!!
     
     

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    Hi Guys pretty new to this site however, i have a 325tds, i love it to bits ran her on the rolling road when she was standard and she ran 133bhp, a bit down on standard i know but she did need a service, since then its been serviced needs another now tho but ive also had it superchipped and dyno'd again shes pulling 155bhp now, as standard it was running 13psi of boost, would be interested to know how far you got with your upping the boost tests, how did it run at 20psi??? 17 you guys said seemed fine, i could do with a little help as i would like to up the boost on mine too, get a few more ponies out of her lol.

    how did you actually go about upping the boost, and what psi figure did you get comfortably from it??? i tried a valve that you could wind in and out but i plugged it onto the little vacume from the turbo and tried it a few times without any difference, am i doing something wrong??

    i also have a bigger intercooler off an evo 3 to replace the standard one, dont really know how much difference that will make but im hoping for a few extra bhp

    any help with this would be much appreciated
    Thanks in Advance

    James
    E36 1994 325TDS SE, 60mm Lowered on 18's straight through system, tinted windows Black Grills,

    and my Jap Crap,
    Honda CRX 1.6 Turbo, Garret T28 Turbo, AEM Fuel Pump, AEM Uprated fuel rail, Fuel Pressure regulator, running with SPOON Internals, SPOON Dump Valve, and lots of pretty Samco Hosing
     
     

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    my old 94 325tds did 0-60mph in 7.5secs on a racelogic gps timer
    these ecu are not remaps but have chips in side the ecu
    on diesel cars you need to add fuel and a small amount of boost
     
     

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