Sideways

This data is only for supercharged S2000s. Naturally aspirated and turbo charged cars are different.

Dynoed some various cam timing changes today and it is a great way to add power.

I am having a problem with boost not holding. It drops off variously between 8000 and 9000 rpm for no apparent reason. (Turns out boost will not hold is a result of the non resistor plugs taking out the AEM EMS above 8000rpm.)

The change of minus two degrees intake and no change in the exhaust resulted in 17 ft lbs and 33 rwhp. Boost (19.3 psi) was dropping off at 8700 rpm. A normal red line would have added more horsepower.



The biggest top end change was seen with minus two degrees intake and plus one degree exhaust. It resulted in an additional 19 ft lbs torque and 25 rwhp. This was at 8200 rpm where the boost dropped off. I have to get that fixed. I should have seen an additional 60 rwhp.


We did some other cam timing combinations and you can see gobs of torque but it kills the top end.
I have a few off set woodruff keys available.

Moddiction

So are there gains with this on a stock supercharged engine? I am currently running 12 psi vortech sc'd with aem ems.

donaldmejr

do you have a dyno graph to show the improvement...this maybe something I may get?

Sideways

I do have dyno graphs and I will post if I can figure out how.

Moddiction, I think you would see a proportional amount of improvement.

Torque Obsessed

You've definitely got me curious.... Looking forward to seeing the dyno graphs.

Deception

Those are some impressive gains from a simple part.
How aggressive is this in terms of engine reliability? I would be tuned for it on AEM , but lets say I put the stock ECU & injectors back in for inspection, will I need to remove the woodruff key?

Sideways

The drop offs can happen anywhere above 8000.

There has been some "dip stick pop up" so I am thinking the krankvent may be suspect. I only have the little one since I destroyed the big one. Blew the plug out of the Krankvent and it was just a hollow tube.

*** Edit May 2011: The BOV is releasing around 17 psi and some times holds for an additional amount giving me spikes. New Mondo BOV is on order. I sense more boost soon. ***


The torque is up nicely in both with the -2,+1 being stronger.

The boost only went to 17.5 psi with -2,+1 cam timing for the 314 torque. Compare that with
over 19 psi and only 295 torque with no cam timing changes.

Sideways

I ran for several months with various cam timings from -4,+3 to +2,+5. Just checking out the drive ability. No tuning was done at that time and the car ran great.

That said, we did see the tune lean out when we added exhaust timing. It would be wise to do a quick dyno check unless you are proficient with your wide band.

IMHO, no change in reliability.

I failed oxides of nitrogen last year. I then retarded the intake cam 2 degrees and passed. Cam timing can be your little friend.

Sideways

The Krankvent is fine. The Vortech BOV is limited to about 17 psi. Time for a new BOV and new power with these changes.

Now, Vortech Mondo vs Turbosmart race port is what I am looking at.

DFWs2k

Dang thats crazy, thanks for forging ahead

I like my turbosmart bov, not sure which model it is.