Hi all,
Thanks for all the questions. Lets see if I can answer them.
1. Yes our Dynojet Dyno is conservative. We have it properly set up for our altitude and shop environment. We feel that our numbers are accurate and represent the proper output of the vehicle. Other dynos my read much higher, but the percentage of power gain from our modifications is usually the same, no matter what you test on.
2. No we do not raise the compression, but we do make sure all the combustion chamber volumes are the same. This could result in an overall compression that may be a little higher. We found that each cylinder can range from 10.2 to 10.4 depending on the individual combustion chamber volume.
3. In regards to octane. This car was run with the Mopar engine controller, which requires 93-octane fuel for best performance. From my calculations a tank of fuel with one can of additive should raise the octane 2-4 points or 93-96 octane. Our final tests were done with higher octane just to see what difference it would make.
We have found these new engines are knock sensitive. It seems that almost every engine we have tested has some knock retard. We know that oil pull through from the PCV system is a factor, oil getting into the intake tract lowers octane and increases knock. We have developed an oil tank that helps this condition while still keeping the PCV system functional for emissions testing. The ACRX has deleted the PCV system to address this issue.
Our cylinder head modifications were designed to work with the stock engine controller and 91-octane fuel. On engines using the Mopar controller we suggest using 93 octane or better if you track the car. Knock control kicks in at higher rpms under load, so if your car has knock most likely it will feel strong until your run it hard into the upper rpm range. Our big concern is for folks running the Mopar controller on the track full out with 91 octane fuel and no PCV oil canister, this could lead to excessive knock and piston damage.
I hope these explanations help. Again, as I have stated before, the engine management system on this car is very sensitive and we must work with the production and Mopar calibrations. Our engine modifications produce modest gains within the calibration parameters provided.
We are currently testing several other power adders that will work with our heads as well as complete turn key engine build packages.
I am very excited about seeing more end user results for our Gen 4 performance packages expressed on this forum!
