Zoom Zoom Boom
10-27-2010, 08:18 PM
#56
Not really a bombshell. At least not from this perspective.
Having tuned/accessed/dynoed/datalogged/etc close to two dozen FI Renesis applications with W/M, I have found that in every single case, the power loss that comes as the price tag for the "insurance" that W/M allegedly provides is greater than just tuning the motor to a margin that would preclude its necessity.
W/M in concentrations where it does not cause excessive EGT increases (near 50%), adds so much fuel value that it completely negates up to .06 lambda in the fueling calculations. This is not acceptable to me.
If you adjust the tune (timing and fuel) to accommodate the W/M, you completely negate its value as "insurance".
Having tuned/accessed/dynoed/datalogged/etc close to two dozen FI Renesis applications with W/M, I have found that in every single case, the power loss that comes as the price tag for the "insurance" that W/M allegedly provides is greater than just tuning the motor to a margin that would preclude its necessity.
W/M in concentrations where it does not cause excessive EGT increases (near 50%), adds so much fuel value that it completely negates up to .06 lambda in the fueling calculations. This is not acceptable to me.
If you adjust the tune (timing and fuel) to accommodate the W/M, you completely negate its value as "insurance".
10-27-2010, 08:41 PM
#58
Even with the finest jets and latest turn-on times, power always dropped and EGT climbed.
Because of the way air moves through the Renesis, even the smallest amounts of water quench combustion almost completely.
Once I got concentrations up to the point that combustion would continue, the fueling values would shift. At those concentration, the damage to the metal bits becomes a serious concern as methanol dissolves aluminum.
10-27-2010, 09:24 PM
#59
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With the Snow, AEM, CoolingMist and Devil's Own kits, I could never get the doses small enough.
Even with the finest jets and latest turn-on times, power always dropped and EGT climbed.
Because of the way air moves through the Renesis, even the smallest amounts of water quench combustion almost completely.
Once I got concentrations up to the point that combustion would continue, the fueling values would shift. At those concentration, the damage to the metal bits becomes a serious concern as methanol dissolves aluminum.
Even with the finest jets and latest turn-on times, power always dropped and EGT climbed.
Because of the way air moves through the Renesis, even the smallest amounts of water quench combustion almost completely.
Once I got concentrations up to the point that combustion would continue, the fueling values would shift. At those concentration, the damage to the metal bits becomes a serious concern as methanol dissolves aluminum.
10-27-2010, 10:06 PM
#64
There aren't any threads with useful information, other than Rich's excellent post from 5 years ago here:
https://www.rx8club.com/showpost.php...93&postcount=3
https://www.rx8club.com/showpost.php...93&postcount=3
08-29-2011, 10:35 AM
#73
SARX Legend
iTrader: (46)
I have pretty much determined that W/M is not necessary if you have a good tune. I have read a bunch of stuff and on the rotary the consensus is that it really is not that beneficial. I guess I can sell my BHR throttle body spacer now
08-29-2011, 10:46 AM
#74
from what I have read, not only is it not beneficial, but it has negative effects, specifically on EGT which would put more stress on the turbo and the motor. Last week I might have made another argument but this thread resurrection has changed my mind.