papaseven
Member
The main reason for the high idle on T/C's is to keep the voltage up. If it drops below about 12.2-12.4 it will set a code.
The fact is that EVO's ran at idle with NO oil pressure to the crank. The valve would redirect most if not all oil to the overhead at idle. They did just fine because of roller bearings instead of babbit bearings.
My personal opinion is that raising the oil pressure on a stock T/C oil pump is iffy at best especially one with over a few thousand miles on it.
It puts a heavier workload on the already barely adequate stock pump. Add to the probability that you have some crank runout and you're asking for problems.
If you have anything over 10 lbs at hot idle and over 30 lbs at 3000rpm then that's plenty.
The relief valve is there more to protect the pump at cold start up when the pressure can get pretty high.
The T/C pumps redirect the relief pressure back to the inlet side of the pump anyway.
Geno
The fact is that EVO's ran at idle with NO oil pressure to the crank. The valve would redirect most if not all oil to the overhead at idle. They did just fine because of roller bearings instead of babbit bearings.
My personal opinion is that raising the oil pressure on a stock T/C oil pump is iffy at best especially one with over a few thousand miles on it.
It puts a heavier workload on the already barely adequate stock pump. Add to the probability that you have some crank runout and you're asking for problems.
If you have anything over 10 lbs at hot idle and over 30 lbs at 3000rpm then that's plenty.
The relief valve is there more to protect the pump at cold start up when the pressure can get pretty high.
The T/C pumps redirect the relief pressure back to the inlet side of the pump anyway.
Geno
