Quote:
Originally Posted by CamOnlyJabroni
King could share one of my logs if he wants. I think my car pulls 1.5-6g/cyl. It might not help this thread though because it’s a CAMARO forum. My MATs are 130 the first pull then the motor heat soaks the blower and raises to 160’s in the heat and holds there. The blower is able to maintain whatever the MAT is at the start of the pull. This is in 85-90 degree weather. I’m sure the secondary radiator will help. 15-18’ M7’s didn’t come with it from the factory.
|
Couple important items about maintaining C7 Z06 MATs with the Maggie 2650.
1. Be sure you are logging the correct Manifold Air Temp - there are 2, one is calculated, one is actual. Only way I know how to find the right one is to log them both with key on, engine off than disconnect the MAT sensor. The "Actual" one will immediately default to -40F the calculated one will still display a temperature.
2. Be sure that your intercooler system is full! Cold water from the radiator should be routed into the bottom fittings of the intercoolers with a Y (not a tee) and it is critical that the cooler are filled when running. My system is completely stock except for adding a Magnuson reservoir to the outlet of the intercoolers for a better fill point and a Y to feed the coolers near my MAF meter.
We recently ran a half mile event with the car, made 8 passes without opening the hood or any cooldown other than key off in the staging lanes.
Ambient temp was 73F car has an M7 transmission
Car left the starting line with a MAT of 142F
At the shift to second (64MPH) MAT was 126F - max of 55% throttle and 160kPa could be used in first gear.
At the shift to third (95MPH) MAT was 100F - Full throttle at the end of 2nd gear with a peak MAP of 232 kPa
At the shift to fourth (120MPH) MAT was 77F - Full throttle for 3rd gear with a peak MAP of 237 kPa
At the shift to 5th (148MPH) MAT was 79F - Full throttle for 4th gear with a peak MAP of 240 kPa
Finish line in 5th (170.5 MPH) MAT was 84F - Full throttle for 5th gear with a peak MAP of 233 kPa
As you can see from the data, a correct operating PD system will start with heat soak from the standing engine, then recover quickly once the throttle is opened increasing mass flow through the coolers. The MAT is high at idle and cruise conditions because there isn't enough airflow through the coolers. Once WOT is hit the MAT should drop quickly to nearly the temp of the water in the system (which should be close to ambient temp)
Once the pass is under way we can see the cross over point at the end of third gear where the water temp had been warmed and the MAT will slowly increase until equilibrium is found between the cooling in the low temp radiator in the front of the car and the heating provided from the intercooler cores (which from experience is about 15-20 degrees on a Z06 (less on a Camaro thanks to a bigger low temp radiator)
Hope this helps.