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Progressive Vs Linear springs

July 13, 2017

Linear springs: Linear springs require the same amount of force per inch of compression throughout its full travel. Almost all OEM’s use linear springs for three main reasons: 1.The automaker has the luxury of designing the strut, tower, and suspension geometry around their spring and shock. Therefore if they want the car to be...
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E30 Stock Spring options and Spring rates

July 5, 2017
E30 Stock Spring options and Spring rates

These are from technical specification drawings for stock E30 springs straight from BMW Germany. The spring forces and lengths were from BMW Germany, while I calculated the spring rates to accurately compare the springs per inch of travel. Only looking at spring force does not allow you to compare springs because it only signifies the force...
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E30 Electrical troubleshooting schematics

July 2, 2017

        1988 E30 M3 Electrical Schematics 1987 E30 M3 Electrical Schematics 1990 E30 IX Electrical Schematics 1989 E30 IX Electrical Schematics 1988 E30 IX Electrical Schematics 1992 E30 Convertible Electrical Schematics 1990 E30 Convertible Electrical Schematics 1989 E30 Convertible Electrical Schematics 1988 E30 Convertible Electrical Schematics 1992 E30 Electrical Schematics 1991...
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E30 Torque Specs and Technical Specifications

June 30, 2017

      Engine Torque Specs: Camshaft chain tensioner rail Securing nut……………………………………………………………………….35 ± 5 Nm (26 ± 4 ft. lb.) Camshaft drive belt tensioner to engine (Bolts)………………………………………………………………………….…………..22 ± 2 Nm (16 ± 1 ft. lb.) Camshaft oil carrier to cylinder head M6 bolts …………………………………………………………………………..…….9 ± 1 Nm (80 ± 9 in.lb.) M8 bolts………………………………………………………………………………22 ±...
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How to change a rear wheel bearing on an E30

June 6, 2017
How to change a rear wheel bearing on an E30

A rear wheel bearing job, dependent on which tools you have can either be a fairly painless job, or rather difficult. What you will need to make it easy is: Basic range of wrenches Plenty of 3/8 extensions Socket set with ratchets Hex Key Bit Socket Set or Torx key bit socket set (depending on...
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Anti theft GPS Tracking for your car without a monthly subscription

June 5, 2017

If you have ever tried to find anti theft options for your car you probably know that you basically have two options: One time payment transmitter based systems such as Lojack – old style system, pre GPS and pre modern cellular network technology. These systems depend on the supplier to hide a transmitter in...
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Best way to remove brake dust, stone chip rust and rail dust

June 2, 2017

What do stone chip rust spots, industrial fallout in your paint and brake dust have in common? Iron. In the last 10 years there has been an introduction of Thioglycolic acid or “Fallout removers” introduced in the automotive market. The existence and use of Thioglycolic acid isn’t new; foundries used it as far back...
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BMW Motronic Tuning, specifically Motronic 1.3, 1.1 and 1.0

December 30, 2016
BMW Motronic Tuning, specifically Motronic 1.3, 1.1 and 1.0

*If you have .bin files for chips or XDF files for these ECU’s please email them to me at admin@rtsauto.com and I will upload them to this page as a resource for others.* Bosch Motronic 1.3, 1.1, 1.0, 1.7 are the primary ECU’s that power all E30’s. 1.3, 1.1, 1.0 for M20’s (6 cylinders)...
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How to recharge the AC in your car (Eg. used will be E30) and how to use AC manifold gauges and pull vacuum

December 15, 2016

Recharging your own Air conditioning system is one of those things that seems difficult, but really is rather simple as long as you have all the correct tools and follow the correct steps. I will as in depth as I can describe how to properly pull a vacuum on your car, how to check...
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E30 Aux fan resistor replacement and the two different E30 auxiliary fan types

December 14, 2016
E30 Aux fan resistor replacement and the two different E30 auxiliary fan types

The auxiliary fan resistor is in need of replacement when the auxiliary fan does not operate at low speed. The aux fan should activate: When the AC is on (by way of selecting the AC button in the interior) When the radiator coolant temperature sensor reaches sufficient temperature to trigger the aux fan To...
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