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#1 · Sep 22, 2014 helo im looking for someone who has experience or knows about chip-tunning for this engine m50b20 Ive been looking at this one from AC Schnitzer http://www.ebay.co.uk/itm/AC-Schnit...hp-213nm-/301317341015?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item4627e9bf57 any good ??? ------------------------------------------------------------------------------------------------------ any other tips and tricks on upgrades and maintenance for this engine is very welcome ... this is my first bmw and very happy with it. but its very different from the old opel.s with carbs no kat and an ignition you set with a screwdriver :rofl: im definitely going bmw for the future loving my tank :thumbup:_a__a2_ Sort by Oldest first Oldest first Newest first Most reactions #2 · Sep 22, 2014 Turner motorsports, although the best thing to do for your engine is to upgrade it to the 525 one... #3 · Sep 22, 2014 the problem with turner motorsport is that its american made for american marked. its 91 octane in europe its 95 octane and the emissions on that chip is u.s spec and no good compared to the euro emissions rules.... iknow alot would say chance the engine to 525 but that not and option. #5 · Sep 22, 2014 (Edited) US 89 = UK/Europe's Ron 91/92. US 91 octane = UK/Europe's Ron 95. Basically nobody else follow's the US's octane conventions except the US. Most of the rest of the world is on the Europe system. Secondly, the turner chip is meant for 525's not 520s. If you write to them, however, they may have a 520 chip for your M50 engine. The pricing would probably be the same, considering that its already so expensive for the 525 chip. If possible, pick up a clone. And don't worry about emissions. Your car is not subject to the very latest emissions that the newest cars are - the standards are different for older cars, and our emissions were already pretty great. DME controlled fuel injection, with a good ccv system as our car has, will do that for you. Thirdly, that big bore throttle body is meant to fit a 525's intake manifold, not a 520's one which is slightly smaller. You could do this : 1. Get a 525 maf, and intake air boot. These are bigger than the 520. 2. Fit these with a rubber/mounting tape adaptor your fashion yourself, to your existing throttle body. 3. Use a dremel and enhance the opening on the air box where the maf fits. The current opening will not fit the larger maf. If you go back to your 520 maf, use an rubber/mounting tape adaptor to fit it to your new air box's opening. All of the above will increase your airflow slightly, but is probably not worth the trouble. Other mechanicals in the list the follows would be the priority. ( from here on out you can do these suggestions independantly with 1-3 : ) 4. Switch from the stock air filter to a knn style one. Flows more air. Of course flows more dust but its still insignificant enough to do nothing to the engine. And it can be washed frequently (every 1-3 months) in running water or a bucket of water with laundry detergent, immersed for 2 hours, so it stays cleaner more consistently, and you'll be able to use this for life. No need to oil the filter, that's overrated. 4.5 Make sure the air filter is regularly cleaned. Stock filters should be soaked overnight in a bucket with laundry detergent and water at least once every 3 months (sooner if you drive alot). Does not need to be bone dry before reinstallation - merely drip dry. A very damp stock air filter dries out naturally within 30 minutes of driving, and there's no danger to the engine - it would be just like driving during a rainstorm. 5. Remove the venturi-style noise reducer fitted to the front of the air box., It can be knocked out from inside the box. It can be refitted if you change your mind. 6. Purchase a vacuum pressure gauge, learn how to use it and interprete its readings and use it to confirm that you have zero vacuum leaks on your engine at all times. If its not perfect, check your intake boots, all clips, gaskets, especially the valve cover gasket, your ccv fitting to the valve cover, the air hoses around there, and all clips securing air hoses to the intake manifold (including the brake booster's hose) to make sure there are no leaks, cracks, whatever. Vacuum leaks reduce performance and fuel economy. 7. Do a diesel flush on your engine at the next oil change interval. Add 1 litre of pump diesel to the crankcase and run the engine at idle for 15-20 minutes, then drain and use new oil and filter. This will totally clean out your engine's internals as best as can be done without a teardown and decarbonisation. Repeat this once every year...does not need to be done at every oil change. 8. Switch to fully synthetic oils. They are in fact cheaper most times than dino oil, and last significantly longer, providing better lubrication and protection throughout. Your performance will be slightly enhanced. Castrol edge is a great idea. 8.5 Switch to thinner, and thicker oil, and see how your car performs and what the fuel economy is like. Depending on the quality of your bore linings (which is directly proportional to your mileage), thicker/thinner oil improves combustion chamber sealing. Its difficult to tell without just trying it out, so do so 9. Get a new ects. Its the blue tipped engine coolant temperature sensor that's under the intake manifold (not easy to get to). $25 oem. The dme is highly reliant on the ects's inputs for precise fuel-air measurements. 20 year old ones are not as sensitive as they need to be, and can sometimes cause flooding problems when they go bust and are kept online by our dme which was not too sensitive for these things....so you're removing a known weakness in advance and its cheap. 10. Make sure your tires are properly inflated and balanced (all 4), and that the wheels are correctly aligned (front alone). This protects your tyres and ensures your performance does not bleed off unnecessarily. 11. Check your spark plugs - ideally change them to long lasting bosch plat4s or the equivalent denso ones. They are far less prone to wear due to use. 12. Make sure your transmission and rear diff fluids are good. Old fluids are thicker, lubricate less, and create more fluid resistance. 13. Clean out your fuel injectors - add 2-4 litres of diesel (not more) to a nearly empty fuel tank and immediately fill up to the brim with regular gasoline. I mean immediately - at the same or adjacent fuel pump. This ensures both fuels mix well, and over the course of one fuel tank your fuel injectors will get cleaned up somewhat. This is better than paying 50x more by volume for commercial fuel injector cleaners. 13.5 Radian will tell you to get rebuilt and flow matched fuel injectors and new fuel injector O rings, and that's good advice too. Not cheap ($120 for a set of 6) and the work is a little involved but can be DIYed if you are careful. 14. Check your error codes regularly and pay attention to flagged problems. The stomp test does not work on your car, you'll need to get an aftermarket laptop based software and cables. Will cost you US$50 shipped off ebay, and a good long term investment. 15. Go for an italian tuneup from time to time. 16. Remove unnecessary weight from your trunk. 17. Sell your car and purchase a 525. Put in the turner chip. 18. Save your money and purchase a 525 engine and transplant it into this one. Put in the turner chip. I believe that about covers it all... 0 Reply #4 · Sep 22, 2014 and another thing would this big bore throttle body fit my m50b20 ??? http://www.ebay.co.uk/itm/BMW-e30-e...45d080c1ea5ec86f4876&pid=100010&prg=20140221143405&rk=14&rkt=24&sd=301317341015 #6 · Sep 23, 2014 thanks so much for taken the time to write all this US 89 = UK/Europe's Ron 91/92. US 91 octane = UK/Europe's Ron 95. well learn t something new gonna do the steps 1-2-3 4. i saw some bmw dyno readings on kn&n that show it didnt do anything besides leting more dirt trough and a lot at that... the standard filter don't seem restrictive like on some older carburetor cars so im gonna leave that one... 5. im gonna look at that one whats the drawback on removing it ???? 7. ive never heart of that one. sure that cant do damege to the engine??? 8. what oil would you recommend in thickness ? remember i live in Scandinavia it get very kold at winter sometimes... i think there 15-40w on now but not sure 9. gonna chance that 1 13.5 where do get these flow matched fuel injectors ??? .. gonna do that 1 to... ive already orded new nrg irridium spark plugs beisansystems single-vanos repir o-ring and metal ring gasket for everythink on top vanos and camhousing hoping the vanos repir will help it makes the rattle-snake noise now and dont seem to pull very well below 3000 rpm when i stomp the gas pedal... everything after 3000rpm and it flyes off no problem This is an older thread, you may not receive a response, and could be reviving an old thread. 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