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42's and tuning question
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[QUOTE]Originally posted by dynolabs: [QB] Hi all, Here's a brief rundown on the reason SCT tune sessions take a little longer than what most folks are used to. SCT software allows fine tuning of the MAF transfer function. This is key for getting your long/short fuel trims within +/- 5% correction. What that means is the EEC does not have to add/remove a whole lot of injector pulsewidth (fuel) to maintain the commanded air/fuel ratio in the base fuel table. The result is a crisp throttle response and improved drivability. Dyno Labs tunes the entire MAF transfer function from idle to redline. Mike is correct about being able to re-use standard tune values for things like injector size, MAF, axle ratios, timing maps, fuel maps, etc. But the one thing that is unique in each car is getting that last 10-20% of the MAF transfer function dialed in. No two cars are alike in this area. A good example is the fact that most people that buy mail order chips end up sending them back several times for retunes and ultimately give up. This is because it is guesswork since the seller doesnt know what the MAF is doing. Even more critical is that without data logs, the seller doesnt know if the customers blown car has a MAF pegging (maxing out at the 5 volt limit) before the car is done reving - really bad and could lead to dangerously lean conditions. The rest of our tune sessions cover extensive data logging, careful WOT tuning, road testing and fixing drivability issues with customers cars. Issues like coast down shuffle, hanging idle after clutch-in, stumble, idle quality, partial throttle hesitation, shift quality, etc. SCT allows fine tuning of all these other areas of operation. With the awesome capability of SCT's new software, it is only natural that we would extend that capability to our customers through comprehensive tune sessions. Happy motoring! Ray [/QB][/QUOTE]
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