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Old 04-26-2009, 07:25 PM   #1
VTTroy
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Join Date: Feb 2009
Location: Gaithersburg, MD
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My Ride: 323ci
SLR Motorsports Help

I recently bought a 2000, well-used, 323ci. I just noticed that there is an SLR Motorsports "chip" mounted on the engine.

I've heard that it is a just a resistor wired into the IAF.

How is it installed - series or parallel? How do I remove it? Do I cut it out? Is it spliced into a wire? Do I need to reconnect a wire that was cut during the installation?

Thanks for your help.
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Old 04-27-2009, 01:44 AM   #2
tbehling
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can you take a picture?
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Old 04-27-2009, 03:13 AM   #3
BMW_Stu
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My Ride: HPF 330ci
Is it doing any good?
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Old 04-30-2009, 11:59 PM   #4
VTTroy
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I removed it.

Tonight I removed this SLR Motorsports part. It was wired into the IAF sensor (?). There are only two wires, and it was wired in parallel. I could have just cut it loose from the top. I contacted the company and got a poor response from them. They wouldn't tell me how to take it out, even though they presumably sent installation instructions to get it in.

I broke it loose and cracked it open. The part inside is a 16 pin, isolated resistor pack. There are eight resistors connected from pins on one side to corresponding pins on the other side. Each resistor on the chip measured 32.77kOhm. Only one resistor was connected. I told SLR that I looked it up on the Internet and was not interested in debating the design or effectiveness of it - I just wanted it out. They replied that "The SLR chip is not what most people think it is." True: most people think that a chip is an integrated circuit with transistors and logic gates or whatever it takes to process data. This is just a resistor in a chip package that can be called a "chip". Brilliant.
These things sell for about $60, but you wouldn't know from looking at it. The case wasn't glued and certainly not waterproof. There was no strain relief on the solid wires which will eventually break under vibration.
If I were to make one of these, I would just get a 32.4k resistor and wrap it with shrink tube.

Measured the resistance of the sensor. The engine was still warm from driving about 3 hours earlier. 989 ohms and rising slowly. It eventually got to 1.2kOhms after about an hour. The SLR males the car think it is a couple of percent hotter than it really is. The percentage goes up as the car gets cooler.

It was connected with crimped butt splices. That sucks. Now I have to join a pair of broken wires. They were really short.

I didn't take a picture, but I soldered the wires and used a special aviation grade heat shrink splice that is sealed on the ends and has solder in the middle. I also managed to get an extra piece of heatshrink on each wire. I wrapped the sleeve with high temperature tape.



A quick road test showed noticeable improvement. I previously had quite a bit of hesitation from a stop, and now it is fine. I'm really interested in mileage.

I can appreciate hijacking a sensor for certain performance issues. There are probably some racing needs to do something like this. I can also accept a niche high-performance market where someone charges a high price for something simple. My big problem with this thing was its shoddy construction, which is really a slap in the face to someone willing to drop that kind of money. They could have at least used stranded wire.
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Old 05-04-2009, 09:03 PM   #5
BMW_Stu
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glad u got that sh!t out.

SLR motorsports =
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