If it's not a chip I wouldn't touch it with a barge pole.
The resistors work by fooling the ECU into thinking the incoming air is cooler than it really is, giving a little more fuel and ignition advance. It won't make a significant difference to performance but would knacker your fuel consumption, IMO. In any case, fuelling and timing are under control by the ECU based on feedback from the Lambda sensors and the knock sensors so chances are the ECU would actually just learn different corrections and continue to run the car as it was after a while. You might even end up with a fault light and limp-home mode if you take the corrections out of their allowed range.
A replacement chip will contain different maps for fuel and timing and will give a slight improvement. Still nowhere near 25 BHP IMHO, and you need to ensure you get exactly the right chip for your ECU and engine. I'd speak to m-tek on here rather than getting one off ebay. That way you've got some support and some confidence that you're actually being sold the right thing.
Normally aspirated engines simply can't be chip tuned in the same way that turbo diesel engines can, yet people make the same kind of claims about the results.
If you really want to tune a normally aspirated engine you've got to get more air through it. This means ensuring the induction and exhaust systems are spot on (on the V6 the induction system is reckoned to be very good, exhaust manifolds are poor) and then moving on to porting the cylinder heads, changing the cams (fitting 3.0 cams to a 2.5 is a good upgrade) and perhaps upping the compression ratio. It's not a cheap business and there aren't any cheap solutions. You're up against the laws of physics, I'm afraid.
Kevin
Author
Topic: So called 25 BHP+ Mods ?? (Read 1112 times)