I was browsing eBay today and stumbled accross this item:
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&rd=1&item=7920035852&category=33553

What does it do? Manipulate the EHA? Anyone try it or something similar?

I also saw this along with another one that supposedly hooks to a sensor and adds 22 horsepower at the rear wheels. No one bid on it, which leads me to believe that it is a new variation on the magic "black box" that the automobile companies don't want you to know about. In my opinion, if it were that easy to add power to the engine, with no adverse side-effects, Mercedes would have done it already. If anyone has tried one of these devices it would be interesting to hear their experience.

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M. Sandler

1986 560SEC: 150,000 miles, runs great, but I've got to sell it (too many cars for one man)
1987 560SL: 122,000 miles, used to run poorly, now (thanks to forum), runs great!
1997 GMC Jimmy: Turned out to be a turkey.
1989 T-Bird Super Coupe: 150,000 miles, still runs great. Ford got it right.

Power Module, Black Box, Secret Tuning . . . it's a resistor that alters the timing of the ignition. Yes, VW folks have used it for decades, but it's not going to get more air and fuel into the bores so that you can have a bigger explosion and therefore more HP. There may (and this is full of caveats) be a slight increase in how fast your car gets up to max HP, but it's not going to be making more HP. Rest assured you're probably going to have to up the grade of gas your using to avoid premature detonation.

The guy claims that his little black box richens the mixture. My bet is that it's a plain resistor that goes in series with the temperature sensor. It is supposed to "fool" the computer into thinking that the outside temperature is a little lower, making the air denser. The computer adds more fuel to match the denser air and viola another 200 horsepower, at least.

Zoom,

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Norm in NJ
Next oil change at 230,000miles

All KE systems have a WOT switch and, with one exception that I'm aware of run "open loop;" (ignore the O2 sensor) and enrich the mixture to near the ideal for maximum power 12.5:1 A/F ratio at WOT.

The only exception I am aware are certain V-12 600SELs from the early nineties era. The second year out the power rating was reduced from something like 402 to 389. The sole reason for the change was elimination of WOT enrichment, so those models run closed loop all the time when warmed up.

Most cars have WOT enrichment, and it has no effect on emissions because they never touch WOT during the certification test, however, EPA is phasing in a more aggressive test with higher acceleration rates, speeds, and use of the A/C. Some low powered cars will probably require WOT, and some may have to eliminate WOT enrichment to pass the emissions bogeys.

No WOT enrichment can cause catalyst overheating if WOT is held for a sustained period. If there is WOT enrichment, essentially all the O2 is consumed in combustion and there is not enough in the engine out exhaust to support reaction in the catalyst, so the catalyst will not overheat.

Duke