cams cams and more cams

[Dweezle]

I will thankyou for that explanation Warren.
Clears alot of things for me.
Very well written!!!

Sent from my GT-I9100T using Tapatalk 2

[mad_mat1987]

Hi Mat,

I can regrind you cams if you require bigger.

Specs are
226@ .050"
270deg advertised duration
.363" lift
I can do them in either mechanical or HLA profiles (the mech are slightly bigger).

There will be a small sacrifice in low end power (below 2500-3000rpm) but everything above that is an increase in torque and power. If you carry out cylinder head work at the same time you can bring back the low end power, and also further increase the mid/high power and torque at the same time, so you have the best of both worlds.

I have a car running around on cams similar to those listed above with a good std valve cylinder head package. It is fitted with a TD05-20g turbo with an 8cm exhaust housing on a custom manifold. Good power starts at 2500, and further again at around 3400rpm, peak power at 6500rpm. First tune it made 220rwkw on 14psi, and its going back tonight for another tune to lean on it a bit harder, as the first tune was very conservative. I will post the dyno results on here when I have them so you get an idea of the curve, but I can tell you it's very fat considering the turbo size. The reason you see vehicles with big peaky power numbers and no low end torque is usually because they cram massive amounts of boost in std cylinder heads to get the power. Applying big cams to these cylinder heads makes the power narrower again.

The key to having a broad power curve is to key the right pieces together. An engine with a well thought out cylinder head and cam package with the right hang ons will make more power, much broader power and torque, and less boost to do so.

Picking cams for a turbo engine is the same as picking cams for an NA engine, you need to work out what rpm points you want your power and work around that. Cams for turbo engine generally come back 1-2 profiles to put the power at the same RPM point as an NA engine (so slightly smaller grinds), and the dial in points are different on a turbo application, usually you run 2-4 deg wider phase angle between the 2 cams.

Cheers
Warren

wow that was very helpfull ok i guess some head work is in order then. can you email me what work would be needed to be done to the head to suit these type of cams that your offering???