The PCM will not adequatly adapt to increased air flow. Since our trucks are speed density systems rather then mass air, the PCM does not adjust to increased air flow as you stated in the same way a mass air system would. The various sensors in the system try to estimate how much air is coming in, but it is not an accurate measurement at all. It then takes the sensor inputs and compares them with static values that are stored in a table as part of the factory PCM settings (values for IAT, MAP, etc). If the sensor estimates do not match the table values, it goes with the closest table value and adjusts fuel/timing accordingly. So as long as your PCM still has those factory table values, no matter how much you increase air, it will not adapt beyond a certain point (top end of the table). That is the other reason to get the flash. These values are adjusted so that if the sensors estimate there is more air coming in, the PCM will have better values to tell it what to do with that air, thereby taking taking better advantage of air intake mods like CAI, bored out TB's, M1's, etc... That's why if you get the M1 flash from B&G or KRC, you will not lose low end with an M1, and you will not need a turtle.

 

When I called the Mopar performance hotline they said that the stock pcm would adapt to a 2bbl single plane M1. I do agree that it will only compensate to a point, and you certainly will not get any argument out of me that these trucks don't run better on the B&G flash than the stock pcm, Superchips, or anything else for that matter, but, as far as the M1 flash goes you will see far more out of the higher shift points than the revised timing and fuel tables. The turtle is not needed, but logic would dictate that it does help with low end power as the decrease in intake volume would have to increase vacuum signal. Which is why you supposedly lose low end power anyway. How much vacuum- I do not know. I already have the turtle installed in the M1 ready to go on. I will take a vacuum reading after the install, and, if I get bored, I may take it out and take another. If I do I will post the results.

 

I'm curious, how does the turtle install in the intake? Does it bolt in? Did you get the cone shaped one, or pyramid/triangular?
If you can, it would be awesome if you could post some pics of the m1 an turtle before you install them.

 

Basically, I have an egr M1 and a turtle designed for the non-egr. I took the egr plug that came with the install kit, drilled and tapped it, inserted it into the egr tube in the bottom of the plenum, then threaded the turtle screw into it (using teflon tape on both threads of course).


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Sorry for the low quality images. I had to use my phone as I seem to have lost the usb cable for my camera[:@]

 

I almost forgot, sorry for jacking the thread Texas.

 

not a problem. Yall answered my roller rocker questions, so im glad to let the thread wonder into something that is interesting to me as well, the M1 and the PCM flash.

No worry about it, mopowar!!! Just keep on with the pics and info!

 

Hope you don't mind the question here but do you ever wish you had gone with the harland sharp adjustable rockers rather than the non-adjustable? I'm going to purchase a set of some brand to install with the M1 intake and headers.
Thanks!

 

if your question is directed to me, i have not yet installed my rollers but they are on their way. I dont really know why anyone would wish they had gotten the non-adjustable, unless they were wanting to go to the larger 3/8" diameter rods. Dont you have to convert over to the larger rod if you us the adjustable?

As for me, i think ill pass on setting the lash and just stick to the quick and easy non-adjustable.

Anyone else got an answer?

 

Do you mind if I ask where you bought your rockers?

 

i bought mine from Mancini Racing. 297 + shipping. They dont have them in stock but it was the cheapest i could find them for, and im not in any hurry to put them on. I might get them next week sometime.