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

 

Changing the VTEC point won't damage the head internals. In any case, the high load engage on P30 is 4800.

 

You may also want to find new people to get information from, as I think they have damaged head internals as well.

 

so what do you mean by high load engage? and yes you can damage engine, hondata has 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.




"

so i dont believe they are full of crap, so does anybody know when the vtec crossover is on a stock jdm p30?

 

Yes... It is not recommended to set the VTEC point below 2000 rpm.

4800 is not below 2000. 4800 is also not above 6500.

High load means under high load... If you don't know what load is, please do a search. Google is great.

Stock high load engage is 4800, like I said. They have it correct.