CraigTDI Posted May 17, 2005 Report Share Posted May 17, 2005 Hi I am new so please be gentle anyway the problem i have is with my golf 110 TDI i had it chiped by upsolute last week and since then i have been getting boost problems. when i floor it the car pulls like a steam train but sometimes when it is on boost it cuts out the boost all of a sudden then kicks back in like if someone is pressing the brake I did have a MERC maf on it wich is 6 months old but i took this off and now there is a new VW maf on it and so far is seems fine but i havent had a chance to fully ceck it on a long run do you think the MAF was the problem ? i cant understand it if it was as a mate has the exact same map on his car with the MERC maf and no probs what so ever sorry for the long post Link to comment Share on other sites More sharing options...
CraigTDI Posted May 26, 2005 Author Report Share Posted May 26, 2005 anyone? Link to comment Share on other sites More sharing options...
Rustynuts Posted May 26, 2005 Report Share Posted May 26, 2005 I presume it's a mk 4 tdi 110 rather than the mk 3? It sounds as though the problem is overboost, but what causes this. Either Upsolute have given you a map which gives too much boost for your turbo to hold or the turbo has a failing wastegate. Link to comment Share on other sites More sharing options...
CraigTDI Posted June 23, 2005 Author Report Share Posted June 23, 2005 sorry i didnt think about the model yes it is a 110 mk4 golf mine has did this right after getting the re-map done yet my mate got his done on the same car and his was fine up untill recently where he has had the same problem how would i test the wastegate? Link to comment Share on other sites More sharing options...
Rustynuts Posted June 24, 2005 Report Share Posted June 24, 2005 To be honest, I've had nothing to do with wastegated turbo's but the spring which holds the wastegate shut sound like it's too weak to hold the extra boost you've now got. I would think a new wastegate would be up to the job as it comes with a new spring, and will be stiffer. Best I can do, I'm afraid. Link to comment Share on other sites More sharing options...
Soapsuds Posted June 24, 2005 Report Share Posted June 24, 2005 Not an expert by any means on this model - knowledgable in Turbos though - see my Sig , but this is an overboost problem and is most probably caused by the wastegate failing slightly. The chip will have upped the Boost output, fueling etc, but the Wastegate will be unable to handle the extra pressure. Wastegates are easy to strip off and test - usually a circlip / few bolts. Test with a bike pump to see when the gate opens. This failure will lead to the ECU cutting the boost - it does this by stopping the fuel flow into the engine temporarilly. An uprated wastegate SHOULD solve the problem. A new spring might do the trick. Your mates wastegate will have degraded slightly over time with the uprated boost which is why he now has similar problems.... Hope that helps! Link to comment Share on other sites More sharing options...
Tobes49 Posted June 24, 2005 Report Share Posted June 24, 2005 I think you will find the wastegate on most diesel vw are operated by vacuum not boost pressue. Becuase they do it like this they can pull all the boost out anytime, and limit engine power. Link to comment Share on other sites More sharing options...
CraigTDI Posted June 26, 2005 Author Report Share Posted June 26, 2005 Thanks alot for the info lads i will take it to my local VAG specialist to get them to check the wastegate I was also told of a little gizmo called a "Dawes Device" that can limit the boost so this it never overboosts think this may work? Link to comment Share on other sites More sharing options...
CraigTDI Posted July 24, 2005 Author Report Share Posted July 24, 2005 right fitted a boost gauge and here goes I was told anything over 1.6 bar is dangerouse yet after fitting my new boost gauge i have noticed mine is peaking at 1.9 and sometimes even 2 Bar maybe this is where my boost problems are coming from as the may be getting to such a level that the ECU is shutting down the fuel supply and going into limp mode Link to comment Share on other sites More sharing options...
Mollox Posted July 24, 2005 Report Share Posted July 24, 2005 Could be teaching grandma to suck eggs here but don't forget that you have absolute and relative BAR. Normal atmospheric pressure is 1 Bar so when Vag-com tells me the car is blowing 2.55 bar its actually 1.55 relative (vs 1 standard I think) I doubt that a 110 TDi blows harder than a remapped S3 w/ K04 so your "2 Bar" is probably an absolute reading i.e. its actually 1 bar. Not sure what a standard 110 turbo blows at but its most likely to be around 0.7 bar so 1ish sounds about right for a remap. Of course, I don't know the specifics but I doubt yours is pushing 2 bar Link to comment Share on other sites More sharing options...
CraigTDI Posted July 25, 2005 Author Report Share Posted July 25, 2005 Right fitted my Dawes device and it seems to have capped the overboost to 1.5 ish BAR also the holding back seems to have stopped Link to comment Share on other sites More sharing options...
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