Mazsport dyno results!
12-23-2007, 10:51 PM
#28
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Awesome Scott!
That graph is wikked smooth. (No I am not from the east coast meh!)
I am hoping I can post my results with a slightly less restrictive exhaust Thursday or Friday.
That graph is wikked smooth. (No I am not from the east coast meh!)
I am hoping I can post my results with a slightly less restrictive exhaust Thursday or Friday.
12-26-2007, 10:51 AM
#45
Knowing Scott's MAPs from his Int-X, its likely he is running even less timing that that.
12-26-2007, 12:18 PM
#46
BDC Motorsports
Its up.
That is too much timing at the torque peak on this motor. Maybe at fuel cut, but at the torque peak the leading needs to be in the 7° - 9° range with a 15° split on pump gas. (For sure on the west coast. In FL, you might eek out 1° or 2°.)
Knowing Scott's MAPs from his Int-X, its likely he is running even less timing that that.
That is too much timing at the torque peak on this motor. Maybe at fuel cut, but at the torque peak the leading needs to be in the 7° - 9° range with a 15° split on pump gas. (For sure on the west coast. In FL, you might eek out 1° or 2°.)
Knowing Scott's MAPs from his Int-X, its likely he is running even less timing that that.
B
12-26-2007, 12:29 PM
#47
Registered
I find it interesting that your turbo bridgeported engines run MORE timing than a stock or streetport!!! That is completely counter intuitive yet works beautifully.
12-26-2007, 12:29 PM
#48
EGTs are unaffected by that retard. The nominal EGT at the turbo inlet at the torque peak is pretty low to begin with (for a rotary motor, at least) in the 1600°F range.
The Renesis is even more sensitive to split than it is timing advance. At the threshold of detonation, 2° or 3° of additional split has more effect than the same amount of leading retard.
This is because of the "EGR" effect.
The Renesis is even more sensitive to split than it is timing advance. At the threshold of detonation, 2° or 3° of additional split has more effect than the same amount of leading retard.
This is because of the "EGR" effect.
12-26-2007, 01:09 PM
#49
EGTs are unaffected by that retard. The nominal EGT at the turbo inlet at the torque peak is pretty low to begin with (for a rotary motor, at least) in the 1600°F range.
The Renesis is even more sensitive to split than it is timing advance. At the threshold of detonation, 2° or 3° of additional split has more effect than the same amount of leading retard.
This is because of the "EGR" effect.
The Renesis is even more sensitive to split than it is timing advance. At the threshold of detonation, 2° or 3° of additional split has more effect than the same amount of leading retard.
This is because of the "EGR" effect.
Chris
12-26-2007, 01:34 PM
#50
BDC Motorsports
Have you even done spark advance tuning Jeff? Ever spent the hours on the dyno playing with this stuff over the years? A reading of EGT's is the primary determining factor when making timing changes because it's the figure that changes when you fire spark earlier or later! It's what tells you when you're marching in the right or wrong direction! The difference between 7-9* and 13* yields a substantial change in EGT!
Here, let me give you an example of what I know I'm talking about: http://bdc.cyberosity.com/v/ProjectC...ontrol/Videos/
You call that low??!
Having too little split wouldn't cause detonation. It would cause pre-ignition.
Riiiiight.
B
Here, let me give you an example of what I know I'm talking about: http://bdc.cyberosity.com/v/ProjectC...ontrol/Videos/
The nominal EGT at the turbo inlet at the torque peak is pretty low to begin with (for a rotary motor, at least) in the 1600°F range.
The Renesis is even more sensitive to split than it is timing advance. At the threshold of detonation, 2° or 3° of additional split has more effect than the same amount of leading retard.
This is because of the "EGR" effect.
B