Maxing Out Afm

[Chris_Beli]

Hey all, start with car details 99 s2 c34, exhaust, fmic, pod, ebc, safc 2

Recently upgraded to a kando TD05H 18G turbo and when hitting around 14-15psi everything cuts out for a second and my mechanic explained it as the stock AFM getting maxed out and over loading. My question is firstly is it most likely he is right, and secondly is there any solution besides getting a z32 and a nistune, could the safc be causing it somehow?

Cheers for any input, I do plan on doing the z32 etc in the long run just wondering if there is a temporary fix

[scotty nm35]

It is AFM airflow cut, a feature of the stock ecu. You will have to lower the boost for now and look at an ecu to get rid of it completely although I thought the SAFC had a voltage clamp built in...

[KiwiRS4T]

With those mods you need a Nistune now. You probably need bigger injectors as well as the Z32afm but at least with a Nistune you can safely tune the engine to the limits of your current set up.

[QWK32]

is the stock boost sensor still connected to the system, its the one at the back of the engine above cylinder 6. it will cut the engine like you said at around 14psi. you will hit this boost cut well before you hit airflow cut (maxed afm) on the stock maps. how much boost were you looking to run? on a TD05 you may get away with it on a stock AFM but you will definitely need Nistune to get a bit more out of it. stock mapping only uses about 80% of the AFM's resolution.

depending on how the SAFC is currently setup it will affect the airflow cut. if your currently adding to the airflow then you will hit the cut earlier, if your taking from it then you will be delaying the airflow cut.

[Chris_Beli]

The safc should be delaying it then as it is said to reduce fuel consumption not boost power, and I'm not trying to run massive boost I'm happy with about 13-14psi it's just like I said it can't hold that with this turbo whereas it seemed to just get there with the stocker, I don't know about the boost sensor still being in the system I will check with my mechanic