Quote:
Originally Posted by steve99
All dynos read different i believe maha,s read particularly low and it depends on how all the calibrations and adjustments on the dyno are set up.
pretty warm day as well
The main thing you looking at is the gain over stock which is about 25 hp or so this seems very good good for just a tune on a stock car.
normally you would only see 10-15 or so.
What may have happened is the base run was compromised maybe wheel slip or you had been lugging the car round at low rpm in high gears prior to the run. I have seen iam down to 0.4 when people drive that way on 91 fuel and it can result in quite a few lost hp over entire rpm range. A bit of light throttle driving through the rpm range will see the IAM return to closer to 1 and the hp return.
On 91 fuel with stock tune the engine knocks quite a bit especially in low rpm high load, this causes the ecu to take action to reduce the knock and it will reduce a parameter called the Ignition Advance Multiplier or IAM to pull timing reducing knock and also reducing power over the entire rpm range
The tuner does his work and reduces knock in the problem areas and lots of other stuff the IAM now runs at 1 as you tune is optimized for 91 fuel not 93 as the stock tune is. The car will run better smoother and less knock and more power as you have seen.
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That is a possibility as it is my daily drive and most days it's only driven around 14 miles round trip to work at mostly up to 45-50 mph. That will change in a few months as I'm moving an the drive will be longer and faster. Do you think the ECU will correct itself as it "learns" the new driving? The car only has around 5,000 miles on the odometer.