390 SE Air Flow Meter

[tvrvxr]

any ideas where to source or have repaired/reconditioned a "flapper" style air flow meter for a 390 SE. Are 350 meters compatible?

[nwarner]

I've been told that the AFM is matched to the ECU so you may be better getting yours repaired (not sure who does this though). The AFM on a 350i is the same though it could be set up slightly different especially if matched to the ECU. They are also the same as an Rover SD1.

Nige

[KKson]

As per my reply on the TVRCC thread, Standard 390SE's had the normal Rover AFM, whereas a number of them were upgraded with the larger jaguar AFM unit. If it's a standard one then the 350i/ Rover SD1 vitesse is the same, apart from the internal spring setting which will need adjusting to suit the engines characteristics.

Mark Adams at Tornado systems had a shelf load of them when I was there the other year. he does offer a repair/check service also. I've a spare standard Rover unit that came with my 390SE before I upgraded both ECU and AFM to the jag item but to be honest I want to keep hold of it just in case a future buyer would want to return it to original tune, even though I doubt they will want to drop the power back down also.

I've also a few spare standard 350i AFM's but can't vouch for their condition. They've sat in my garage top room for some time.

[mrzigazaga]

You are better off as said getting yours rebuilt/re-calibrated...what makes you suspect it needs to be rebuilt?

[gmw9666]

Pretty sure I’ve 2 x larger Jag AFMs on the shelf gathering dust

[tvrvxr]

Thanks for the responses guys. We fitted a replacement meter and all went well, so pretty sure the meter is at fault.

GMW have these been used on a wedge and do they need the Jag ECU?

[KKson]

tvrvxr said:

Thanks for the responses guys. We fitted a replacement meter and all went well, so pretty sure the meter is at fault.

GMW have these been used on a wedge and do they need the Jag ECU?

It's nothing to do with matching it to the ECU. It's a matter of matching it to the engine, such as level of tune, ported heads, camshaft, injectors etc. The only thing to adjust is the main spring and associated fuel/air mixture, plus fuel pressure. It can be roughly set with a decent exhaust gas analyser but best way is to run it up on a rolling road.