chuntington101

Totally understand! It was meant as a compliment.

What do you do with the stock aux cooler? Is there any way of using that to help cool the engine water better? Or is the added oil cooling more than sufficient with your twin kit?

0D3PE

If you're talking about the factory oil cooler then you can toss it once you install our oil cooler system. It is replaced by a billet machined piece that has a thermostat built into it.

You won't have any oil cooling issues ESPECIALLY with the dual oil cooler option.

spoolin98

Any chance you could post pictures of the different "stages" of porting?

HessViper

Met someone at the car show in palm beach today, who explained to me a few things about these cars that are his belief, and after studying this graph which he pointed me towards, as well as many others that are on his phone, I believe he is right.

First I need to confirm that the 2 lines in the graph do not actually cross, they merge for a moment at highest psi boost, but then then the taller line goes back to being above the lower line.

If that is indeed the case, then this graph, and others like it, are the smoking gun that when the cars reach certain boost psi level at the MAP, the car's computer chooses to intentionally pull timing and/or run rich to limit power.

For instance, if after the HP lines merge, if this merger was due to the intake pipe being the limiting factor, then as the rpm continue to increase, the 2 HP lines should stay merged all the way to the peak rpm point, as the car only consumes more and more air as rpm increases, thus the intake pipe being a limiting factor would remain as a constant.

But instead, the 2 lines separate again, and the top line regains its lead over the bottom line.

This is because (in his theory) the boost level in the manifold in the car drops off right towards the peak RPM (this drop is shown in your graph above in the bottom boost PSI section), as the engine consumes the air at a higher flow rate than the blower pumps at peak rpm, and once the map pressure psi limit or threshold is no longer being hit, then the car's computer ceases to reduce engine power via the methods of retarding the timing and/or running a richer AFR.

He went on to say that this entire situation is further resolved/avoided when one uses the Norcal Catless Downpipes, as the blower flows more air with less restriction once the cats are removed, so equal or more oxygen is moved into the chamber per revolution cycle, without as high of MAP pressures.

He explained that this is why the tests on what the Norcal downpipes gains vary customer to customer.

For instance, if the customer's car is already making excessive psi and the car is already limiting HP prior to the norcal pipes being installed, then the Norcal downpipe installation will allow for much larger gains to be realized as some of the the gains were already there on the intake side, but were being limited by the computer.

In these cases where the gains from a ported blower or better flowing intake system or faster pulley setup etc were already being limited by the stock tune, the customer sees the Norcal downpipe gains plus the gains from the already existent intake side modifications upon installing the downpipes lacking the cat restriction, as the lack of cats brings the manifold MAP psi down a few notches, so the car's computer no longer limits HP by pulling timing and/or running rich, as it was prior to the norcal downpipes being installed.

This becomes important at lower altitudes sooner than it does than cars at higher altitudes, as MAP pressures are naturally higher in the manifold where the air is thicker vs where the air is thinner. People at higher altitudes apparently need not worry about this unless they do tremendous mods which create 3+ psi vs their stock configurations.

He went on to say this is how the zr1 will have to be tricked as well, with either headers or Norcal downpipes. He says the stock tune is fully capable of handling more air flow, but the thresholds the car is looking for have to be avoided, to keep the car from limiting power as more air flow is achieved.

I write this theory here, as he was a strong advocate that if I buy a z06 and drive it here at sea level in florida, the first upgrade I should do are the norcal pipes, especially if I plan to do other mods, and retain the stock tune, and avoid limp mode and engine codes.