Can anybody help ????? (I could get upset with the car and do a ‘Basil!!’)After changing out all the old ignition kit for the high output ‘034 Motorsport’ kit, new Bosch spark plugs torqued up correctly, replacing all of the vacuum tubes , replacing the turbo to intercooler to plenum hoses and odd bits ‘n’ bobs, I though I had the surging issue licked. I was wrong.
Although the car is most definitely more responsive, the hesitation between ‘1.2 to 1.7’ bar and around ‘3250 rpm’ still exists in top gear, as I found out on the motorway today on a longer run. (Not apparent in lower gears!!??!!) It cannot be the ignition system or the induction system as it feels like someone is blipping the brake/misfiring (Not smooth like it should be) under acceleration and it’s all new. I would actually say, based on previous experience that it’s almost like the engine management system cannot react quickly enough to a rapid change of acceleration. The car is running ‘MTM’ phase 1 engine re-map (2.2/2.3 bar max instrument gauge pressure on full boost), RS2 exhaust manifold, K&N filter, Stainless steel free flow cat (200cpsi Cats, )exhaust, plus all the above already mentioned changes.
I have spent a couple of hours researching the issue again this afternoon and it might turn out to be the actual ‘MTM’ ecu conversion!! (I hope not as it was not cheap) Especially since it did not do it before the conversion!! Numerous URS4/S6 owners that have done similar upgrades to my self, which includes the ‘MTM’ conversion, report similar issues. Even to the point that similar issues have been noticed on other Audi S and RS models!!.
So if it’s not the coils as the original stuff has been replaced with better and less kit, it’s not the induction system, as all the tubes & hoses have been replaced, its not the spark plugs as they are all new and torqued up correctly, what is it???
It does not hunt, it does not do it when cold, it does not do it all the time and sometimes if you floor the pedal to the metal it does not do it!!!!! And pulls like a train.
I am going to replace the boost control valve for the ‘034’ Motorsport’ bit, as it appears to be not the correct one, as the turbo input hose does not sit on it correctly plus its old and may be the Oxygen sensor as well, as it old too. Apart from that I am at a loss with this one!!
Why would a car tuner not be able to correctly set my car because it’s an automatic??? I some times wonder if a tuner who can set up the car correctly, even though it is an automatic, might get rid of the issue but I might be pulling at straws here, as my current tuner/service garage cannot fault the car but it cannot be set up well because it’s an automatic??? Even though he has a rolling 4WD rolling road?? (Waist gate set up, etc)
Constructive comments please if you had a similar issue and you sorted it?? (UK/England Car)
Lastly, Ha anybody done a conversion similar to the MTM phase 1 but by a different manufacturer and had similar problems or no problems at all??
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