cisco
» CMF Member
David rang me up on Wednesday evening while he was having a relaxing beer on the ferry from Tasmania headed over to the mainland.
They got White Knight going a bit better and did a power run on the dyno. Made less power than it should have, but for a couple of very good reasons that are now known, and actually positives. One is that the composite gasket further reduced compression right down to about 8.0:1. This means less power for the same level of boost, but really means that you can wind more and more boost into the engine. So this engine will never die. So next step is to chase more boost to get the power up.
Which leads to the second thing they discovered. The blow off valve was leaking badly. They heard some wooshing noises under boost, and yeah the BOV was letting some of the boost pressure get out. A stiffer spring was installed in the BOV and this made the boost go up to 12psi from 10psi when it was leaking. That's literally a 20% gain in boost pressure and probably power just from that tiny leak.
An updated power run at 12psi is yet to be done since the BOV was fixed.
This graph shows the run at 10psi with the leaking BOV and 8.0:1 compression. This has to be the smoothest torque and power curves I think I've ever seen. That torque curve is virtually saying that you will receive the same push in the back force at virtually any RPM. Imagine driving it. And the power just climbs and climbs so smoothly.
From speaking with David, sounds like White Knight will be back with more boost sometime. The mechanic even said after they fixed the leaking BOV, that you could feel noticable extra pushback in the seat just from that 2psi.
Still a couple of idle problems to sort out, but all in all the car is going great.
They got White Knight going a bit better and did a power run on the dyno. Made less power than it should have, but for a couple of very good reasons that are now known, and actually positives. One is that the composite gasket further reduced compression right down to about 8.0:1. This means less power for the same level of boost, but really means that you can wind more and more boost into the engine. So this engine will never die. So next step is to chase more boost to get the power up.
Which leads to the second thing they discovered. The blow off valve was leaking badly. They heard some wooshing noises under boost, and yeah the BOV was letting some of the boost pressure get out. A stiffer spring was installed in the BOV and this made the boost go up to 12psi from 10psi when it was leaking. That's literally a 20% gain in boost pressure and probably power just from that tiny leak.
An updated power run at 12psi is yet to be done since the BOV was fixed.
This graph shows the run at 10psi with the leaking BOV and 8.0:1 compression. This has to be the smoothest torque and power curves I think I've ever seen. That torque curve is virtually saying that you will receive the same push in the back force at virtually any RPM. Imagine driving it. And the power just climbs and climbs so smoothly.
From speaking with David, sounds like White Knight will be back with more boost sometime. The mechanic even said after they fixed the leaking BOV, that you could feel noticable extra pushback in the seat just from that 2psi.
Still a couple of idle problems to sort out, but all in all the car is going great.
, so does the SC not have a wastegate? how do these gadgets adjust the boost,