Had a issue with what felt like a misfire.. turned out it was a school boy error on my part. with mine been a very late year engine it has a EGT probe that actually controls the fuelling, earlier S3's don't have this and seen as my MTM kit was originally on a early S3 it never had it.. I assumed I didn't need to run it with the new set up and MTM map (and Kim at QST the UK MTM dealer also never mentioned i needed to run it)
In a nutshell I do need it. So off came the downpipe (What a Bas tard that was
) and thanks the Bill @ badger 5, who sent me a bung to weld in the probe and also gave me advice on where to locate it and the settings needed to adjust the fuelling side of my ECU (top guy)
The probe is right on the flange near the outlet to the turbo, its about 100 degrees away from its OEM location hence the need to adjust my Fulling setting son my map. Standard is 920 degrees, Bill has told me i need to adjust this down to 850 degrees.
while the downpipe was off i decided to also weld in a bung for a Air Fuel ratio meter too which ill fit at a later date
Bill told me my car would be running rich without the probe and also very slow (it was fast as a mo fo)
any how, he wss right it is certainly much faster now (i didnt think that possible tbh
)
This whole probelm only came when i fixed some boost leaks, one of which was huge. this will have been making it lean, but the probe not been installed for the EGT will have been making it rich so counter balancing it out and masking any issues.. soon as the boost leaks were fixed it was just running rich hence the miss fire feeling (actually protection from ECU from dumping too much fuel)
all sorted now, car just awaiting custom mapping.
Drove it saturday tho, fast as fooookery and no black sutt on my tailpipes which i was getting when running rich.. happy days
Downpipe, had this bung welded here for AFR meter
Here is the EGT probe and control box
