making vtec kick at 4k rpm r there pros and cons 2 it

 

I'm sure there are more con's than pros to this.. or everybody would have it like that you know.. and Honda wouldn't have designed it to kick in later..

 

what i heard was its better to set it later. on my gsr swapped eg my vtec is hittin at 56.

 

vtec needs to be set where the engine wants it set... not where u or someone told u it should be. the proper way is to set it on a dyno. You run one pass with the vetc set high then another with vtec set low. see where they cross and thats where you set the vtec to come in.

 

The only way to really know when VTEC should engage is by watching your torque curve on a dyno. The old fashioned "butt dyno" is not the most accurate method. There is an optimal range for the engagement point because our engines are designed to flow a certain amount of air at a certain velocity during various rpm ranges. If you engage VTEC too low, you will increase the amount of air available, but lower the velocity thereby reducing torque. Basically, you will lose power if you set it too early. Finally, you dont need an S300 unit to do this. You could save yourself some money and go with Crome. That way with the money you saved, you can invest in some actual dyno time.

 

I will go along with every thing say but please dont compare crome to s300. yes they may do a few of the same things but in no way the same animal.