Low boost after hitting speed limiter

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Viewing 13 posts - 16 through 28 (of 28 total)
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  • #173979
    turbo-tone
    turbo-tone
    Participant

    UK - England

    Posts: 679

    Gary on car focused was down on power in his mk2 recently. Turned out his cat had failed. How do you know it has a sports cat? Assuming you have reciept?



    Dreamscience imap U2+. Ramair induction. Mountune mud flaps. Scorpion Sports Cat. Scorpion Tracker. Wind deflectors. NB washer jets and shark fin aerial. EBC Grooved discs, YellowStuff pads. Airtec Intercooler to be fitted

    #173985
    GM
    GM
    Participant

    UK - Wales

    Posts: 2530

    Not sure a smoke machine will help tho, will it pressurise the system? If  you have been through all pipes and so on would be obvious, turbo connection is the hardest to get at tho. Do you have stock pipes and intercooler?

    #173998

    Willierich
    Participant

    UK - England

    Posts: 7

    Yeh just got the car Saturday morning but done 600 miles no issues until I gave it some proper beans and now I’m in this situation. As far as I know it has a stock map. I only thought a decat would bring up a code but I’ve not had much to do with them until recently so I’m not 100%

    #174000

    Willierich
    Participant

    UK - England

    Posts: 7

    And just got told by the seller it had a sports cat and he bought it with one on a year and a half ago, I’ll see if I can tell what make it is when I’m next underneath which will be tomorrow I can imagine. And pipe wise I have a ramair induction and crossover pipe that leads to the turbo then that’s it the rest is stock to the intercooler, intercooler is stock and from intercooler to intake manifold is stock

    #174001
    71-bda
    71-bda
    Participant

    UK - England

    Posts: 7459

    Gareth, I think you are mistaken about 6000 revs being 140 ish,  140 is more like 5250 revs in 6th, and 6000 revs is like 160mph, and flat out is about 6300 at 167 ish indicated…



    No nothing.

    No Mods. No rockers. Just a chunky knob, thats now been replaced by an RS knob innit.

    No tackiness.

    Std as Ford intended, but with a space saver wheel and jack and nuts and wheel brace. oh.. and flaps, a man has got to have flaps.

    Innit?

     

    #174003
    GM
    GM
    Participant

    UK - Wales

    Posts: 2530

    Its been more or less the same for a few of us, even the guy on youtube 6K just under 140 or 220 kph…. Add a NX2 and a 7400 limiter and you hit the clock 😆

    #174004
    GM
    GM
    Participant

    UK - Wales

    Posts: 2530

    The stock turbo really runs out of puff, above is at 440 tune also….

    #174005
    GM
    GM
    Participant

    UK - Wales

    Posts: 2530

    Sorry wrong screenshot above limiter flat out below

    #174110

    Willierich
    Participant

    UK - England

    Posts: 7

    Right, had a look and I can’t tell what cat it is but it looks newer and less marked/corroded than the rest of the exhaust so presume it has a sports cat as the previous owner said.

    changed the spark plugs and no difference so set off home from work and after it was warm I thought I’d see what it does if I went higher in the revs(have been driving like a granny since it lost power) and at 5500rpm there was a squeaky rattle so I let off and the noise went away as soon as it dropped in revs, no lights still and still runs fine low down just lacking power.

    The sound reminded me of a transporter we had in thats tensioner on the fan belt rattled like hell but on the transporter the rattle was constant no matter what revs you went to. Still not sure what it could be but at least I have something to go off now, got a rather busy weekend so going to park her up until work on Monday then investigate further

    #174111
    yorkirs
    yorkirs
    Participant

    UK - England

    Posts: 555

    Daisy  Duke say hello and welcome to 155mph club



    Nitrous Blue – Forged Alloys – FMP375
    Loads of car washing and waxing at the moment

     

     

    #174112
    71-bda
    71-bda
    Participant

    UK - England

    Posts: 7459

    if the RS does 81 mph @ 3000 revs, its 100% for sure that at 6000revs its doing 162mph or thereabouts, gearing does not get shorter as the revs go up. Gareth, in those screenshots, hes in 5th gear innit !  231 KMH is about 140mph, and thats NOT flat out in 6th, its flat in 5th.



    No nothing.

    No Mods. No rockers. Just a chunky knob, thats now been replaced by an RS knob innit.

    No tackiness.

    Std as Ford intended, but with a space saver wheel and jack and nuts and wheel brace. oh.. and flaps, a man has got to have flaps.

    Innit?

     

    #173954
    GM
    GM
    Participant

    UK - Wales

    Posts: 2530

    Stock map would have to be some length to the air strip? 😆 6000 rpm in mine is 140 ish not flat road tho… limiter 7200 rpm. Might be something simple as said before, boost pipe off / split or so on…?

    I remember seeing the Stradman video sometime ago, where his stock RS topped out at 145 mph on a dry lakebed…. and run out of lakebed, to get to 6000 rpm, not as good as a tarmac run tho i guess… 8:50 mins in on vid

    https://www.youtube.com/watch?v=qFAprM1eulo

    #174345

    Willierich
    Participant

    UK - England

    Posts: 7

    Right, had a specialist come in yesterday  and diagnose best he can and thinks it’s leaking past the stock recirculation valve once boost builds up so got a GFB recirc valve coming today hopefully to solve the boost problem. The rattle I was hearing we’re thinking is aircon pulley so gonna take off the aircon belt tonight when I fit the new recirc valve and see if the rattle goes away at high revs, will let you know how well that plan goes👍

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