Thread: vet cams

Props on the great numbers.

You obviously dont know how cams work on a turbo motor. Do some reading.

VET cams are good for small turbo setups on the VET as they have little overlap. They wouldnt be good for top end on big turbo setups. They will help eliminate reversion that would normally happen with the small turbo setups on the VE. Big turbos like big cams and as long as you have an efficient setup (tubular manifold and large turbine housing) the extra overlap actually is an advantage and will actually help remove heat from the cylinders and make way more power from mid all the way to top end and hold power out longer.

why the F would you want overlap??

nope

My VET cams are coming in tomorrow, I'll be able to drop them in soon and do a side by side virtual dyno and butt dyno run.

I'm on a small turbo, GtiR T28, with a restrictive manifold, GTiR. So these cams are built for me.

thanks for rubbing it in everywhere

Cant tell if your being sarcastic or serious. Either way.

There are "turbo" ve-t cams made for big turbos from Kelford with even more duration, lift, and subsequently more overlap than the n1 and have proven to make great power and hold without falling to the 9500rpm that the guy took it to.

Like I said, on big efficient turbo setups the overlap can be an advantage as long as your backpressure is lower or equal to your boost levels. The biggest advantage is the extra duration and lift but with the extra duration comes more overlap usually. Overlap is only a bad thing on small t2 turbo setups where backpressures will often see double the boost pressures. Then it would be a bad thing to have a lot of overlap. Hmmm why do you think the VET cams have such little overlap. T2 turbo possibly? lol.

mature comeback...

Thatbeing said, overlap also is very dependent on your cemterlines and cam timing

It's all about managing your pressures correctly. When backpressure (bp) is higher than boost it is beneficial to have less overlap. Setups with close to a 1:1 ration of boost and bp can see good results with big NA cams since the relationship to pressures is close, as they would be in NA form. You can easily see VE over 100% in these scenarios.

Of course, you can have too much overlap. High overlap and high rpms; when the bp raises with rpm you will see the power drop.

It isn't rocket science, you will see good results by just following this rule of thumb. I don't think the high overlap cams are good to work with on small turbos. They don't seem to work as well together. Keep the lift high, and overlap down. Of course in most scenarios this means lowering the duration. But that also depends on centerline and timing like Cory said.

I am close enough to a 1:1 ratio with this 6262 that I think the N1 cams will perform well in comparison to the 20V cams. I think the N1 will make more mid range, less low, similar top end. But i also expect the N1 to drop off on power on the very top a little more than the 20V.

The VET cams spool fast, respond awesome, and make great power on small turbos. This is why Nissan engineers used them in the first place, rather than using a cam grind they already had in development.