Originally posted by DemonSVT:
Originally posted by warmonger:
I know he isn't using secondaries so why the drop in torque at the place where the secondaries normally open up?
I thought with full controll over the timing it would enhance that portion of the graph?


But he is using the secondaries.

I keep telling him to pin them and set the IMRC point to 2000rpm or lower to remove the harsh jump and pressure loss from them opening and see what kind of graph it makes.
IMO it would generate boost sooner and it would definitely get rid of the drop in mid range power.

Boost pressure is a measurement of restriction. It is a major restriction running on only the primary ports then followed by a big pressure drop opening the even larger secondary ports.



Yes, that intake with the fancy secondaries is made for NA. There is meant to be a negative pressure in those runners for them to work optimally (relative to the outside air).

Ideally, a metal single-runner 3L upper would be best, with the 2.5L LIM matched and siamesed, and the heads tapered match on the ports. Leave the injectors pointed at the primary ports. The gas is going to get in there, no matter what

That could take you over the 400WHP mark.

Just my opinion.




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