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Author Topic: Remapped T-Jet 155 and wastegate spring  (Read 3051 times)

Offline Gofra

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Remapped T-Jet 155 and wastegate spring
« on: October 13, 2009, 08:44:43 pm »
Hi folks,

I had my Abarth remapped by (supposably) well known garage and result was good...untill it wasnt :)
Namely, the car behaves very well when it just warms up and when running it "wild" on open roads for longer periods of time. But when I drive in city or when the engine heats up really a lot, theres no performance any more.

I was told that the reason is probably the stock wastgate spring that doesn't function ok anymore due to stretching when everything heats up. I was also told that a shorter spring (or shortening the existing one) will fix the problem.

although this sounds somewhat logical to me, I wonder, how come I've never heard of this before? If this is really the case, shouldn't this be the same with every remapped 155 BHP T-jet unit?

I'd really like to hear some expert oppinions regarding this matter - help appreaciated!

Thnx!

Frane
« Last Edit: October 13, 2009, 08:53:25 pm by Gofra »

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    Offline needsmust

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    Re: Remapped T-Jet 155 and wastegate spring
    « Reply #1 on: October 13, 2009, 10:58:01 pm »
    (cue loads of "well that's what you get / think of your warranty" comments)

    Sorry, no idea.  If they know of the problem, why not fit a new spring with the re-map?
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    Offline Gofra

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    Re: Remapped T-Jet 155 and wastegate spring
    « Reply #2 on: October 14, 2009, 12:28:17 am »
    Sure, by all means - it's just that I never heard of anyone solving a problem this way before. I know about warranty issues. It was actually the abarth dealer that suggested them (partnership) work on my car so warranty issues regarding this are covered ;)

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    Offline Hozepipe

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    Re: Remapped T-Jet 155 and wastegate spring
    « Reply #3 on: October 14, 2009, 09:05:15 am »
    Sounds like bullsh*t to me. :thumbd:
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    Offline Gofra

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    Re: Remapped T-Jet 155 and wastegate spring
    « Reply #4 on: October 14, 2009, 09:12:43 am »
    It doesn't sound like bullsh*t to me - seems logical. But as I said, I never heard of anyone doing the same on his car...

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    Offline sandys

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    Re: Remapped T-Jet 155 and wastegate spring
    « Reply #5 on: October 14, 2009, 10:41:24 am »
    Sounds more like a sensor issue, the spring won't get weak with heat, they are typically bolted on to a turbo that gets bloody hot.

    I know nothing about these cars though, but if the spring is weak its always going to be weak and let off boost not just when its hot but even with cool air, probably more so as you should be getting good boost with cool charge.

    How are the wastegates controlled in these cars?

    Offline Gofra

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    Re: Remapped T-Jet 155 and wastegate spring
    « Reply #6 on: October 14, 2009, 11:15:45 am »
    No idea I'm affraid. But I think the car's got a closed loop boost control which would mean that the computer constantly regulates the wastegate valve. Could a bad map be the issue here? We had a minor argument regarding this since they didn't give me the dyno run papers. Namely, I was told I'll get them...

    Your argument sounds quite logical sandys, thank you.

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    Offline GTMartin

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    Re: Remapped T-Jet 155 and wastegate spring
    « Reply #7 on: October 14, 2009, 04:57:09 pm »
    On the old Porsche 3.3Ltr low tech turbos, they used to put in a different (stiffer?)spring in the waste gate to increase the pressure.

    In theory a smaller spring would blow off sooner.

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    Re: Remapped T-Jet 155 and wastegate spring
    « Reply #8 on: October 14, 2009, 05:35:21 pm »
    I'm pretty sure that a weak spring would not be your answer. Springs aren't particularly effected by heat, until they melt lol. It sounds like a remap fault. I agree with sandys.

    Offline Gofra

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    Re: Remapped T-Jet 155 and wastegate spring
    « Reply #9 on: October 14, 2009, 08:40:55 pm »
    Yeah, the more I think of it, the more it seems so to me as well. Thanx for your input guys!

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