Boost Cut Problems very serious

[S2sedan]

I`m having problmes since I did my RS2 mods. All mechanical mods wore made with no problems, but my eletronics are terrible.

My car was a chipped ABY and had hard boost cuts some times, it came worst when I did the RS2 mods, so I tried to remap it. Chip tuners are terrible in Brazil ( Don´t say: Look after Mihnea, I tried real hard several times... no answer). Now my problems are:

My are still running under 1.5 bar. I always cuts near 1.4, 1.5 bar . A real bad cut. I higher gears it cuts near 1.3, 1.4 on Wot.
If I try to manage the boost on my foot, staying near 1.2, 1.3 I have no problem.

I thought that ABY could run near 1.5 bar. Is there any flow difference when we use the RS2 turbo, so the engine cuts early 1.5 bar, or i have a big problem. I looked for a boost leak, and found nothing. my vaccum is near -0.6, -0.5 on idle.

And it gots near -0.9.

I already tried to disconnect my WG and my pressure is about 0.5

DOES ANYONE HAVE AN IDEA WTF&%# IS GOING ON WITH THIS DAMN CAR ?????????????????????????

[Mihnea]

Bad chip.

I know I have been terrible answering emails, but if you want a fix, let me know it.

Mihnea

[Greg_S]

sounds like you probably have a boost leak that needs to be rectified before you go any further.

[S2sedan]

Mihnea, I really need help ASAP !!!
.......

About the leak, Once I had a Real big one, and the car never cuts, so why It cuts now ???

[Mihnea]

S2Sedan: pressurize the intake to make sure there are no leaks at all. If there aren't and the problem is still there, email me again, I'll be at home today and tomorrow, then again at the end of the week, and I should be able to get back to you and do you a chipset.

Cheers,

Mihnea

[S2sedan]

Ok, I will try to do that. Tell me one more thing, when the MAP cuts the boost it cuts like on ignition, like a overboost protection or it only drops the boost ?

thank for your fast reply this time !


You got an e-mail !!! ..

[Mihnea]

Ok, I will try to do that. Tell me one more thing, when the MAP cuts the boost it cuts like on ignition, like a overboost protection or it only drops the boost ?

thank for your fast reply this time !


You got an e-mail !!! ..

There's 2 cuts available in the motronic M2.3.2: maximum MAF exceeded or maximum boost exceeded. MAF will cut the fuel pump (no more engine) for a second, then use less loss. boost will only cut boost and then start rising again...

Mihnea

[S2sedan]

after the cut, the car can´t get over 0.5 - 0.6 bar it cuts again, and all the time it tries to raise the boost again.

cheers eduardo.

[Mihnea]

MAF cutout then, it could be due to a leak, but not necessarily, a bad chip will do the same. If that's the case, a Unichip won't fix the problem, as it would have to hardwire the fuel pump relay so the ECU doesn't shut it, plus boost control would have to be manual, unless you can live with boost that goes up and down.

I don't know if you really want that, as if you hardwire the fuel pump relay, it won't shut itself in case of an accident, and you may get caught on fire...

Mihnea

[S2sedan]

Is it the same as overboost protection ???

eduardo

[S2sedan]

Or a fault MAF, because it was not doing when the car came from the garage, i changed the WG Spring for the original one and one day suddenly my S2 start doing it !

MAF
Bad Chip
Boost Leak

??????

[quattroamm]

overboost

Or a fault MAF, because it was not doing when the car came from the garage, i changed the WG Spring for the original one and one day suddenly my S2 start doing it !

MAF
Bad Chip
Boost Leak

??????

have you tried replacing solenoid valve (follow pipe from wastegate)

[S2sedan]

I think If solenoid valve try to send more boost than it should, my gauge will show.

[S2sedan]

I`m starting to think that i have a faulty MAF, my idle sometimes get strange, very slow to come down from 1100, difficult to start, and i`m getting really really low mileage with my tank. my multimeter is rich most part os the time.
Any idea ???

[Erikb]

I also have the same problems. I cleaned my MAF with carb cleaner, and changed the lambdasonde. It has improved, especially the mileage. Still the idle is strange and after a cool down periode of approximate 2 hours it is hard to start.