Quote:
Originally Posted by Q8y_drifter
Their reply makes sense. I mean the VVEL allows for perfect and continuously variable cam timing all throughout the powerband so "cracking" it would be useless. If the LTH's are not allowing backpressure to be produced then I wouldn't really blame F.I or GTM for this issue. I'm willing to bet Stillen will run into the same issue if they attempt to tune their kit with LTH's and CBE pre-installed.
Maybe some catted LTH's would allow for some backpressure build up and thus retain pressure in the chamber? I guess someone will need to test this out and see if any gains are made versus stock headers and test pipes combo.
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Only if the values are not fixed according to load and it has some sort of advance/retard look-up tables it can follow to vary according to other conditions (i.e., similar to the ignition and fueling maps)... however, maps for valve timing are usually fixed and only vary by load.