SZ: After Hours

Every vehicle is in need of some sort of help and here at SZ we are willing to help those who need it.  SZ’s very own LJ needed this and more.  His vehicle comes in the form of an 88′ BMW 535, 3.5 liter inline-6.  Many months ago we dynoed it to get a base line and were horrified with the outcome.  The engine struggled to make power and ran extremely lean.  Lean enough to melt pistons.  LJ and I put our heads together and modified his Bosch Motronic ECU to give us the ability to tune it.  Before we did this, the air flow meter (flapper door style) was tweaked to help get mixtures a tiny bit closer.


While on the dyno we fabbed up a way to install a Z32 POP Charger to remove the factory air box.  We will later on down the road install a heat shield for the filter.

The baseline in blue.  Just terrible.  Look at how choppy the graph is.  It struggled many many years this way.  Once we got our hands on it we had this inline engine purring and making alot more power!  See the difference on the tuned run (red).  Needless to say this is an entirely different car to drive.

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Comments (3)

  1. Michael Lehner

    WOW, I havent seen a vane style MAF since my 280zx.

  2. Mahesh

    No kidding. I haven’t seen a vane MAF since my friends KLDE powered MX6.

    That said, is this a future business plan ~ Specialty BMW? 😉

  3. lol, we may look into tuning more of them. LJ previously worked at an independent BMW service shop that may send us their customer cars for tuning.

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