Quote:
Originally Posted by 1slow370
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So I wanted to clarify one thing that pertains to your question in the quote above.
In the dyno comparison chart below from yesterday the timing was fairly conservative for E85 until the 13 psi pulls. What Sebastian did first was get the A/F dialed in on those previous boost levels with about 15-16 degrees of timing in the car. If you look at the dyno chart closely you will see that the curve backs this up. At 3,500 rpm these two runs ramp up much steeper and harder (power/torque/boost) than the previous 3 pulls which are more linear to each other.
Not until after the 11+ psi pulls did he start to get more aggressive with the timing. We then did not go back and dyno the car at the lower psi levels with the higher timing values. All of this combined with the fact that we are running our 2.5" exhaust system opposed to our 3" exhaust. We are fairly certain that around 550 RWH our 3" exhaust system would be about 2 psi lower than what it is showing. The 3" exhaust will eliminate virtually all back pressure on the back side of the turbo's.
Now the 6.9 psi pull was with conservative timing and with the boost controller turned off. Basically wastegate spring pressure.
Thank you, Tony