s300 stock jdm p30 calibration vtec crossover
s300 stock jdm p30 calibration vtec crossover
So in an s300, when u upload a stock map for a jdm obd1 p30 b16, it has vtec set to 4807, I thought jdm p30's vtec crossover was at 5200 (some argue 5500)?, why did the s300 do this, I thought altering vtec crossover on a stock motor could damage the head internals? Or did the s300 also modify stock map to compensate for the altered vtec crossover? Anybody know.? I just want to set the best vtec crossover point for my stock b16 withouth damaging anything
everybody is always so concerned about VTEC crossover. in the case of racing the car or going through the gears , you crossover into VTEC 1 time , 1st gear. so really its not as important as people think. fuel and even more so timing is whats important. altering crossover cannot damage the head , thats rediculous.
post a datalog and your calibration if you want help. its the easiest way.
post a datalog and your calibration if you want help. its the easiest way.
you are right about the racing part, you only cross over once and then stay on vtec, but if it doesnt damage engine, why would hondata warn us about this in their s300 ecu guide?
"Warning
· Do not set the VTEC point too low as the engine will lose oil pressure and possibly damage the engine. It is not recommended to set the VTEC point below 2000 rpm.
· Do not set the VTEC point too high as the high speed cam rocker arm may float on the lost motion assembly, damaging the valve spring retainers. It is not recommended to set the VTEC point over 6500 rpm.
The determine the best VTEC point perform two dyno runs, one with VTEC set low (e.g. 3000 rpm) and the other run with VTEC set high (e.g. 6500 rpm). Set the VTEC point to the intersection of the high speed cam and the low speed cam. Generally if there is a sudden increase in engine output immediately after the cams switch then lower VTEC. Conversely if there is a sudden dip in engine output then raise the VTEC point. Since the VTEC point will be at the intersection of the low speed and high speed cam torque curves, it is normal for the torque to dip around the VTEC point.
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the above quote is straigth from the ecu guide, so i dont believe hondata is would post that for no reason. Does anybody know about the p30 vtec crossover point?
"Warning
· Do not set the VTEC point too low as the engine will lose oil pressure and possibly damage the engine. It is not recommended to set the VTEC point below 2000 rpm.
· Do not set the VTEC point too high as the high speed cam rocker arm may float on the lost motion assembly, damaging the valve spring retainers. It is not recommended to set the VTEC point over 6500 rpm.
The determine the best VTEC point perform two dyno runs, one with VTEC set low (e.g. 3000 rpm) and the other run with VTEC set high (e.g. 6500 rpm). Set the VTEC point to the intersection of the high speed cam and the low speed cam. Generally if there is a sudden increase in engine output immediately after the cams switch then lower VTEC. Conversely if there is a sudden dip in engine output then raise the VTEC point. Since the VTEC point will be at the intersection of the low speed and high speed cam torque curves, it is normal for the torque to dip around the VTEC point.
"
the above quote is straigth from the ecu guide, so i dont believe hondata is would post that for no reason. Does anybody know about the p30 vtec crossover point?