Ebay Speed Chips...

[tetrahydro]

Whenever I browse Ebay I often see things for sale called "Speed Chip +20HP!!!" I find this very hard to beleive, it says it messes with the air/fuel ratio by simple placing it your IAT sensor... well anyways they are extremely cheap and I would definatly buy one, but It seems to good to be true. Has anyone here had one of these, if so, does it cut your MPG or hurt your engine?

[ludeguy]

first of all.. those things are not chips - they call them chips but they are resistors. let's think about what this is actually doing.

your IAT or inlet air temperature gauges exactly that - the temperature of the air that is entering your intake. Warm air is LESS dense than cold air - therefore more warm air is required to maintain the stoicometrically correct air/fuel ratio of aprox 14:1 (someone on here had a more exact figure but whatever it is..)

With this "resistor" that they sell on ebay - the only possible thing you could be doing is "tricking" the IAT into thinking the air is colder than it really is - the result? the ecu is tricked by the IAT that their is plenty dense air outside - so what does the ecu do in response? - it dumps more fuel into your cylinders. If you are doing this on a day where it is actually sorta warm outside - you'll be running your car very rich.

I wouldn't touch that shit EVEN with someone elses car. not unless I had done heavy mods and for some reason needed to run a lil more rich at idle for cooling - and even then I would only match it up to an according resistor with something that datalogs. In fact - i just wouldn't do it, no matter what the case.

if you do want one - just research what resistor to buy and spend 30c on it at your local electronics store. any price on ebay is a rip off.

also see my post here - about the actual socketed/unsocketed ecu chips - cuz i'm sure that will be your next question (;
http://www.automotiveforums.com/vbul...d.php?t=331107

[unknownluder69]

like ludeguy said in a previous post just because the 'chip' says it raises ur redline to 10,000 it doesnt mean that ur engine is meant or can withstand that level of RPMs

[AcesHigh]

Chipping rules ~ you can modify nearly every single value you want. However, I call the ebay chips (JUN, Mugen, Spoon..) "blind tuning". Its similar to buying a used VAFC fuel computer, installing it, and then leaving it at the previous owner's settings. You need it tuned for your application, not someone else's. Although I imagine the JUN program works fantastic on a JUN tuned H22; just not mine.

A similar note, I am all for socketing/chipping. This is the basis for how Hondata and Uberdata works. If only I had an EPROM burner, I'd be tuning daily.