I am about to install a new 2.4L motor on my EVO IX. A 2.3L is coming out and I wondered if I could do the break in of the motor with the existing tune. I have to drive the car about 400 miles to the nearest tune so I will have to drive it with the tune used for the 2.3L. Nothing else is changed, all the components are the same for both the 2.3L and 2.4L.
What do you think...Can I break in the motor with the 2.3L tune?

 

did you dial in the cams exactly to where they were in the 2.3 engine?
If not, yes i would get it tuned.

Changing the cam timing with change VE dramatically.
I would at least run it up on a dyno to check and make sure your new investment lives a long healthy life

 

the motor is not installed yet. It will be installed in a couple of days and I can put the gears in 0 so the cams stay in the same position they were with the 2.3. Does this sound right?

 

I can't see an issue if you're just driving it (not under boost) to get tuned.

 

by Zero, do you mean Zero on the cam gear?

If so... oh boy

 

one of my main concerns is that for some reason the new 2.4L motor was shipped with adjustable cam gears. I called the shop who built the motor to let them know about the fact that I had no idea on the setting of the cam gears and that I was affraid to just dial things wrong. He told me that if I had any doubts I should set them to zero and to have my tuner take care of them. Now.....this is my question....what exactly is zero? what should I do in order not to screw up the whole new motor?

 

do what he told you...
take them to a tuner/mechanic who is competent and save yourself a headache.

Setting them to "zero" will have them far off the "dialed in" numbers. This is because of the taller deck height of the 4g64 block compared to the 4g63 block.

Save your investment, take it to a pro.

 

I totally agree with you. Will do that!