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Tuning a turbocharged CBR929RR tomorrow!!


DTM Brian

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Best horsepower was 145. I also believe there to be an issue with the ignition system because of the spark blow out during the pulls.

Lets just say I think we have a work in progress. The turbo makes 7 pounds of boost. The A/F's are a boost friendly 11.5 to 12. However the bike would not make power. I am suspecting excessive back pressure between the cylinder head and turbo. The turbo was off a old school volvo. It is possible the turbo is not a good match for a engine displacing less then a liter of displacement. Turbos are not created equal. You can two different turbos with the same boost and have totally different results.

Bike also had 3 trouble codes in the ecm. The customer is going to start with resolving the trouble code issues and do a little more testing and we will resume tuning.

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I would have to say the heat range on the plugs is WAY too hot, the ECM isnt used to seeing boost so he may have to confuse it with a bleeder setup on the MAP sensor.

I would say the turbo would be enough for that motor being thats its setup for a 2.2, its either his manifold isnt setup right or the cam timing isnt right for boost

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