Yeh mate. I've been told bits of things like Yaris cam bucket type solid followers, and VW polo 6n2 valve springs but nothing definitive, I'm running stronger valve springs on 4efe cams which I'll explain alittle about now.
Any and all part number, and makes and models will be very much appreciated.
The 4efe cams have very little over lap if any this is in the ep91 UK starlet
Peak cylinder head flow is from 3000 to 4000rpm
This graph bellow is off the UK ep91 running the Corolla tubular inlet
Note how the hp, and torque graphs follow the same rpm peaks and dips but what looks alittle dip in hp is a big dip/drop in torque. Torque is the pull you feel in the car. Hp is how fast the rpm builds.
There are a few things main things that affect the graph including errors such as wheel slip on the rollers.
These are cylinder head gas flow rates and fueling.
The first thing I look at is cam profiles, this tells me where in the rpm the peak torque will happen. (Normally happening over a table top 2000rpm some were in the rpm range.
Low rpm Air velocity affects the up ramp towards peak torque ultimately desiding the figure of the peak.
This is were inlet manifold and throttle aplication/throttle size come into it.
In the above graph we see this setup starts at around 95ftlds of torque then very quickly hits 100ftlds but at 2750rpm takes a sudden drop this in a nut shell is the corrolla inlet in action because of the large throttle size and fueling mismatch (not mapped in) the hp Dips and torque drops off till around 3200rpm were things start to recover and 4000 to 4250rpm were we know are hitting peak head flow/peak torque taylored by the cam profile characteristics.
After this peak flow/torque point it's down to the inlet and exhaust to one not restrict the head flow (back pressure) and two inlet not to restrict the head flow by suppling anuff air volume. On the graph note how sharply the torque drops off but yet the hp still raises. this is were mph starts to struggle to build but the rpm still goes up nice. At this drop off point the more hp you can deliver the shallower/flatter the loss in torque. If you can get it to table top till the rpm limit is reached then you will have a constant build of mph (pull feel).