SL/R129: G force: call for opinions
Thread Starter
Junior Member
Joined: Sep 2010
Posts: 19
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sl500 1995
G force: call for opinions
G force chip and claims - improve performance and gas milage.
True or bogus? Or, marginal positive. Or, does nothing at all.
Opinions based on knowledge or experience?
True or bogus? Or, marginal positive. Or, does nothing at all.
Opinions based on knowledge or experience?
Super Member
Joined: Jul 2010
Posts: 598
Likes: 19
From: Eastern Kansas
94 SL 600, 98 993, 89 XJS Conv., 85 Daimlier Princess 16 Hybrid Lincoln 16 Chevy crewcab
What is G force? As a driver, pilot, reluctant roller coaster rider, and student of physics (50 years ago), I have a concept of "G's" but am clueless about your question. what's up?
Member
Joined: Jul 2013
Posts: 126
Likes: 5
From: Saint Augustine, FL
1998 SL500
Inside of that impressive box is a 3¢ resistor that you wire to the engine's IAT (Intake Air Temperature) sensor--either in series or parallel depending on the nature of the ECU's input configuration. This will fool the ECU into making the air/fuel ratio leaner (or richer) when operating in open loop mode (higher loads and WOT).
The ECU can be tricked into making the mix leaner by making the IAT report a higher intake air temperature, or richer by forcing it to report a lower IAT. Which is chosen for any particular engine is based, for these silly devices, depends on what that engine's control system does at high loads and WOT. Most modern cars run a bit more rich than would be optimal to protect the engine by lowering combustion temperature; so a common cheap tweak for years now has been using the "resistor trick" to make the ECU think the intake air is warmer than it really is--the ECU sees this and leans out the mix just a bit.
The leaner mix reduces any bogging caused by the "stock" richer mix, and if carefully done can improve both power and economy--however this is accomplished at the risk of increasing combustion chamber temperatures AND the risk of engine destroying detonation.
How "carefully" it might have been done by an eBay vendor, relative to your engine's specific needs, falls quite squarely into the "Do you feel lucky today?" category of life's decisions...
Here is an analysis of a similar device I did a few years ago.
The ECU can be tricked into making the mix leaner by making the IAT report a higher intake air temperature, or richer by forcing it to report a lower IAT. Which is chosen for any particular engine is based, for these silly devices, depends on what that engine's control system does at high loads and WOT. Most modern cars run a bit more rich than would be optimal to protect the engine by lowering combustion temperature; so a common cheap tweak for years now has been using the "resistor trick" to make the ECU think the intake air is warmer than it really is--the ECU sees this and leans out the mix just a bit.
The leaner mix reduces any bogging caused by the "stock" richer mix, and if carefully done can improve both power and economy--however this is accomplished at the risk of increasing combustion chamber temperatures AND the risk of engine destroying detonation.
How "carefully" it might have been done by an eBay vendor, relative to your engine's specific needs, falls quite squarely into the "Do you feel lucky today?" category of life's decisions...
Here is an analysis of a similar device I did a few years ago.
Last edited by cliffyk; Dec 20, 2013 at 04:52 PM.
