Boost stops at 1.4bar - N75?

[andy10v]

and did you find that it worked just as well as the old n75 even though they are different models?

Not a scooby yet as it has no ECU

But I expect it to work fine.

[hunker7]

and did you find that it worked just as well as the old n75 even though they are different models?

You want to prove that there is no difference between J K H very much don't you?

[geneandbolly]

[QUOTE=UrS4boy;802656]It seems that you didn't read the link I provided very thoroughly. Try again:QUOTE]

he sounds like a school teacher, doesn't he??! we'll be in remedial class soon unless our understanding of this subject improves!

[geneandbolly]

Broken 3B on the left, AAN on the right (replaced my broken 3B one with an AAN one, just needed to re jig the hoses a bit.

and did you find that it worked just as well as the old n75 even though they are different models?

[newsh]

ABY one has the connector aligned with the short leg

[andy10v]

The connector on the 3B WGFV is at 90 deg to the ABY one. AFAIK this is the only difference.

Broken 3B on the left, AAN on the right (replaced my broken 3B one with an AAN one, just needed to re jig the hoses a bit.

[newsh]

The connector on the 3B WGFV is at 90 deg to the ABY one. AFAIK this is the only difference.

[UrS4boy]

Does N75 affect anything else, or just the fact that it won't boost past .4/.5? For instance, under city driving?

It seems that you didn't read the link I provided very thoroughly. Try again:

http://forums.quattroworld.com/s4s6/msgs/20987.phtml

Your issue is one or more of these:

1. The ECU's internal MAP sensor is not connected to the intake manifold and therefore has no clue about what is happening with the boost, so, by default it is NOT controlling the N75.

2. The MAP sensor is dead

3. The N75 is dead or the wiring to it or the hoses to it have a problem

4. The ECU has a significant fault and is unable to control the N75.

IF you have 100% checked out possibility No. 1, e.g. by using a vacuum/boost pump between the hose at the intake manifold and the connection to the brass pipe going into the ECU (and/or the hose between the brass pipe and the MAP sensor), then your issue is possibility No. 3. You have been pointed to the techniques to check out the function of the N75.

[hunker7]

Does N75 affect anything else, or just the fact that it won't boost past .4/.5? For instance, under city driving?

[hunker7]

Well, i couldn't find H valve anywhere, so i bought J one off ebay (genuine stuff). Will report back if that fixes the problem, cos sorting out loose-ish hoses didn't help... Unfortunately, as that would've been cheap fix.

[geneandbolly]

*ding ding* round three !!

if my car was worth it, i might think about spending the £125+vat on the H model!! for now and £20 the J will do quite nicely, thank you!!

[UrS4boy]

i am sure that the canadian smarty pants will be able to tell us!

I can't tell you the physical differences, e.g. spring strength, solenoid windings, etc. but I can point you (again) to the same article you are pointing to that found that 283H was better (for their tests) than either the 3B's 283J or the ABY/ADU's 283K.

http://forums.audiworld.com/audi-ori.../#post18772235

[geneandbolly]

I think mine is the problem too, checked all the hoses, all tightened up and still no boost. What is the difference between J's and H's?

P.S. Glad to hear that your problem is solved @geneandbolly

i am sure that the canadian smarty pants will be able to tell us!

check this piece here and in particular the graphs for the J and H models - it means little to me but the H one goes higher up the charts by a smidgen - perhaps you can make more of it than i can. all i care about is that my car showed 2.2 bar on the gauge today and goes like lightning - that'll do me nicely

http://forums.audiworld.com/audi-ori.../#post18772235

[hunker7]

I think mine is the problem too, checked all the hoses, all tightened up and still no boost. What is the difference between J's and H's?

P.S. Glad to hear that your problem is solved @geneandbolly

[geneandbolly]

for a few quid, it floats alright..