Resistor tuning - Information and Facts

  • Thread starter Thread starter jenslh
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jenslh

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There's a lot of talk and opinions about resistor tuning on the internet, but few people fully understand the subject.

In fact there's two very important things to know about resistor tuning.

1. Resistor tuning works on both Open Loop as well as Closed Loop ECU's, but in different ways.

2. Just using a serial resistor is not a good idea, as the mixture added will change a lot when the ambient temperature gets hotter/colder.

I've tried to explain the whole thing on my website: www.boosterplug.com

As I'm selling a resistor tuning product, it would be wrong of me to participate in the general discussions on the forum, (but I'll be happy to answer your questions by mail.

I know I'm on the borderline when I post a commercial link on a public forum, but I think its the only site on the internet with a full describtion of the resistance tuning idea, so I hope you'll find the information valuable.

Cheers

/Jens
 
Hi jenslh - you seem to know what you are talking about, so.

How do you rate the TFI Techlusion product in terms of snake oil ?

This has 3 leds that are tuned for various ranges of engine load ?
 
Fascinating information,:thumb2
I installed one of these Resistor tuners (The Accelerator Module) in my GSA a few weeks ago, and I’ve been really impressed with the results so far. The Accelerator doesn’t look as sophisticated as the Boosterplug, but an independent comparison would be interesting.
:mmmm
 
Hej Jens,
jeg kan anbefale dig at bliver medlem (subscriber) til sitet. Det giver mange gode funktionaliteter.

Hey Jens,
I'll recommend that You subscribe to this Site, It'll give You many other possibilities.
 
Jens, hi and welcome

Interesting reading your site and seeing the points you make about adding just a fixed value resistor and the limitations of that solution.

Presumably, changing the Air Temp sensor for one that resulted in a 6% richer mixture would do the trick as well as your 'boosterplug'?

It would just be a matter of measuring the resistance of the existing Air Temp sensor vs temperature, plotting the results on a graph and substituting it with a NTC resistor that gave the same values of resistance corresponding to 20c along the graph.

Nick
 
It seems that BMW changed the the Air Temp sensor part number for most of its boxer engines at the beginning of '97. Maybe that was done to make the engine run leaner to meet tighter emission controls.

Nick
 
nick.ct said:
.......
It would just be a matter of measuring the resistance of the existing Air Temp sensor vs temperature, plotting the results on a graph and substituting it with a NTC resistor that gave the same values of resistance corresponding to 20c along the graph.

Nick
Click to expand...

That's what he's done. I remember doing such calculations for 'A' level Electronics. But he's put the fixed resistors(assuming he needs to skew the thermistor he's using) in a nice epoxy encapsulated box, with the thermistor nicely wrapped up in a flying lead. For $150(inc P+P).
 
nick.ct said:
Jens, hi and welcome

Interesting reading your site and seeing the points you make about adding just a fixed value resistor and the limitations of that solution.

Presumably, changing the Air Temp sensor for one that resulted in a 6% richer mixture would do the trick as well as your 'boosterplug'?

It would just be a matter of measuring the resistance of the existing Air Temp sensor vs temperature, plotting the results on a graph and substituting it with a NTC resistor that gave the same values of resistance corresponding to 20c along the graph.

Nick
Click to expand...

Thanks Nick,

Your theory about a 6% richer NTC is spot on, but you'll never find one in real life. The non linear behaveour of the NTC makes it impossible (Believe me - I tried)

Remember that the ECU is programmed to deal with the non linear input and translate it to temperature.

The only possibility is to add an external NTC that works in coorporation with the Original AIT sensor and a few extra resistors in a properly calculated serial/parallel coupling.

/Jens
 
Just fitted my boosterplug on 1150gs year2000 model with 57,000 on the clock. All I'l say is bloody brilliant piece of kit, best £95 I've spent so far does exactly what it says :beerjug:
 
Nippy Normans supply Touratech, Wunderlich, Desert Fox and many other makes of accessories.
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